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Diffstat (limited to 'libjava/classpath/java/lang/reflect')
17 files changed, 3841 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/reflect/AccessibleObject.java b/libjava/classpath/java/lang/reflect/AccessibleObject.java new file mode 100644 index 00000000000..24418c971c7 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/AccessibleObject.java @@ -0,0 +1,159 @@ +/* java.lang.reflect.AccessibleObject + Copyright (C) 2001, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * This class is the superclass of various reflection classes, and + * allows sufficiently trusted code to bypass normal restrictions to + * do necessary things like invoke private methods outside of the + * class during Serialization. If you don't have a good reason + * to mess with this, don't try. Fortunately, there are adequate + * security checks before you can set a reflection object as accessible. + * + * @author Tom Tromey (tromey@cygnus.com) + * @author Eric Blake (ebb9@email.byu.edu) + * @see Field + * @see Constructor + * @see Method + * @see ReflectPermission + * @since 1.2 + * @status updated to 1.4 + */ +public class AccessibleObject +{ + /** + * True if this object is marked accessible, which means the reflected + * object bypasses normal security checks. + */ + // default visibility for use by inherited classes + boolean flag = false; + + /** + * Only the three reflection classes that extend this can create an + * accessible object. This is not serializable for security reasons. + */ + protected AccessibleObject() + { + } + + /** + * Return the accessibility status of this object. + * + * @return true if this object bypasses security checks + */ + public boolean isAccessible() + { + return flag; + } + + /** + * Convenience method to set the flag on a number of objects with a single + * security check. If a security manager exists, it is checked for + * <code>ReflectPermission("suppressAccessChecks")</code>.<p> + * + * It is forbidden to set the accessibility flag to true on any constructor + * for java.lang.Class. This will result in a SecurityException. If the + * SecurityException is thrown for any of the passed AccessibleObjects, + * the accessibility flag will be set on AccessibleObjects in the array prior + * to the one which resulted in the exception. + * + * @param array the array of accessible objects + * @param flag the desired state of accessibility, true to bypass security + * @throws NullPointerException if array is null + * @throws SecurityException if the request is denied + * @see SecurityManager#checkPermission(java.security.Permission) + * @see RuntimePermission + */ + public static void setAccessible(AccessibleObject[] array, boolean flag) + { + checkPermission(); + for (int i = 0; i < array.length; i++) + array[i].secureSetAccessible(flag); + } + + /** + * Sets the accessibility flag for this reflection object. If a security + * manager exists, it is checked for + * <code>ReflectPermission("suppressAccessChecks")</code>.<p> + * + * It is forbidden to set the accessibility flag to true on any constructor for + * java.lang.Class. This will result in a SecurityException. + * + * @param flag the desired state of accessibility, true to bypass security + * @throws NullPointerException if array is null + * @throws SecurityException if the request is denied + * @see SecurityManager#checkPermission(java.security.Permission) + * @see RuntimePermission + */ + public void setAccessible(boolean flag) + { + checkPermission(); + secureSetAccessible(flag); + } + + /** + * Performs the specified security check, for + * <code>ReflectPermission("suppressAccessChecks")</code>. + * + * @throws SecurityException if permission is denied + */ + private static void checkPermission() + { + SecurityManager sm = System.getSecurityManager(); + if (sm != null) + sm.checkPermission(new ReflectPermission("suppressAccessChecks")); + } + + /** + * Performs the actual accessibility change, this must always be invoked + * after calling checkPermission. + * + * @param flag the desired status + * @throws SecurityException if flag is true and this is a constructor + * for <code>java.lang.Class</code>. + */ + private void secureSetAccessible(boolean flag) + { + if (flag && + (this instanceof Constructor + && ((Constructor) this).getDeclaringClass() == Class.class)) + throw new SecurityException("Cannot make object accessible: " + this); + this.flag = flag; + } +} diff --git a/libjava/classpath/java/lang/reflect/Array.java b/libjava/classpath/java/lang/reflect/Array.java new file mode 100644 index 00000000000..35c77da369a --- /dev/null +++ b/libjava/classpath/java/lang/reflect/Array.java @@ -0,0 +1,675 @@ +/* java.lang.reflect.Array - manipulate arrays by reflection + Copyright (C) 1998, 1999, 2001, 2003, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +import gnu.classpath.Configuration; + +/** + * Array holds static helper functions that allow you to create and + * manipulate arrays by reflection. Operations know how to perform widening + * conversions, but throw {@link IllegalArgumentException} if you attempt + * a narrowing conversion. Also, when accessing primitive arrays, this + * class performs object wrapping and unwrapping as necessary.<p> + * + * <B>Note:</B> This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are <code>java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,</code>, also available as <code>boolean.class, + * byte.class</code>, etc. These are not to be confused with the + * classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are + * real classes. Note also that the shorthand <code>Object[].class</code> + * is a convenient way to get array Classes.<p> + * + * <B>Performance note:</B> This class performs best when it does not have + * to convert primitive types. The further along the chain it has to convert, + * the worse performance will be. You're best off using the array as whatever + * type it already is, and then converting the result. You will do even + * worse if you do this and use the generic set() function. + * + * @author John Keiser + * @author Eric Blake (ebb9@email.byu.edu) + * @author Per Bothner (bothner@cygnus.com) + * @see java.lang.Boolean#TYPE + * @see java.lang.Byte#TYPE + * @see java.lang.Short#TYPE + * @see java.lang.Character#TYPE + * @see java.lang.Integer#TYPE + * @see java.lang.Long#TYPE + * @see java.lang.Float#TYPE + * @see java.lang.Double#TYPE + * @since 1.1 + * @status updated to 1.4 + */ +public final class Array +{ + static + { + if (Configuration.INIT_LOAD_LIBRARY) + { + System.loadLibrary("javalangreflect"); + } + } + + /** + * This class is uninstantiable. + */ + private Array() + { + } + + /** + * Creates a new single-dimensioned array. + * @param componentType the type of the array to create + * @param length the length of the array to create + * @return the created array, cast to an Object + * @throws NullPointerException if <code>componentType</code> is null + * @throws IllegalArgumentException if <code>componentType</code> is + * <code>Void.TYPE</code> + * @throws NegativeArraySizeException when length is less than 0 + * @throws OutOfMemoryError if memory allocation fails + */ + public static Object newInstance(Class componentType, int length) + { + if (! componentType.isPrimitive()) + return createObjectArray(componentType, length); + if (componentType == boolean.class) + return new boolean[length]; + if (componentType == byte.class) + return new byte[length]; + if (componentType == char.class) + return new char[length]; + if (componentType == short.class) + return new short[length]; + if (componentType == int.class) + return new int[length]; + if (componentType == long.class) + return new long[length]; + if (componentType == float.class) + return new float[length]; + if (componentType == double.class) + return new double[length]; + // assert componentType == void.class + throw new IllegalArgumentException(); + } + + /** + * Creates a new multi-dimensioned array. The new array has the same + * component type as the argument class, and the number of dimensions + * in the new array is the sum of the dimensions of the argument class + * and the length of the argument dimensions. Virtual Machine limitations + * forbid too many dimensions (usually 255 is the maximum); but even + * 50 dimensions of 2 elements in each dimension would exceed your memory + * long beforehand! + * + * @param componentType the type of the array to create. + * @param dimensions the dimensions of the array to create. Each element + * in <code>dimensions</code> makes another dimension of the new + * array. Thus, <code>Array.newInstance(java.lang.Boolean, + * new int[]{1,2,3})</code> is the same as + * <code>new java.lang.Boolean[1][2][3]</code> + * @return the created array, cast to an Object + * @throws NullPointerException if componentType or dimension is null + * @throws IllegalArgumentException if the the size of + * <code>dimensions</code> is 0 or exceeds the maximum number of + * array dimensions in the VM; or if componentType is Void.TYPE + * @throws NegativeArraySizeException when any of the dimensions is less + * than 0 + * @throws OutOfMemoryError if memory allocation fails + */ + public static Object newInstance(Class componentType, int[] dimensions) + { + if (dimensions.length <= 0) + throw new IllegalArgumentException ("Empty dimensions array."); + return createMultiArray(componentType, dimensions, + dimensions.length - 1); + } + + /** + * Gets the array length. + * @param array the array + * @return the length of the array + * @throws IllegalArgumentException if <code>array</code> is not an array + * @throws NullPointerException if <code>array</code> is null + */ + public static int getLength(Object array) + { + if (array instanceof Object[]) + return ((Object[]) array).length; + if (array instanceof boolean[]) + return ((boolean[]) array).length; + if (array instanceof byte[]) + return ((byte[]) array). length; + if (array instanceof char[]) + return ((char[]) array).length; + if (array instanceof short[]) + return ((short[]) array).length; + if (array instanceof int[]) + return ((int[]) array).length; + if (array instanceof long[]) + return ((long[]) array).length; + if (array instanceof float[]) + return ((float[]) array).length; + if (array instanceof double[]) + return ((double[]) array).length; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of an array. Primitive elements will be wrapped in + * the corresponding class type. + * + * @param array the array to access + * @param index the array index to access + * @return the element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not an array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #getBoolean(Object, int) + * @see #getByte(Object, int) + * @see #getChar(Object, int) + * @see #getShort(Object, int) + * @see #getInt(Object, int) + * @see #getLong(Object, int) + * @see #getFloat(Object, int) + * @see #getDouble(Object, int) + */ + public static Object get(Object array, int index) + { + if (array instanceof Object[]) + return ((Object[]) array)[index]; + if (array instanceof boolean[]) + return ((boolean[]) array)[index] ? Boolean.TRUE : Boolean.FALSE; + if (array instanceof byte[]) + return new Byte(((byte[]) array)[index]); + if (array instanceof char[]) + return new Character(((char[]) array)[index]); + if (array instanceof short[]) + return new Short(((short[]) array)[index]); + if (array instanceof int[]) + return new Integer(((int[]) array)[index]); + if (array instanceof long[]) + return new Long(((long[]) array)[index]); + if (array instanceof float[]) + return new Float(((float[]) array)[index]); + if (array instanceof double[]) + return new Double(((double[]) array)[index]); + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a boolean array. + * + * @param array the array to access + * @param index the array index to access + * @return the boolean element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a boolean + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static boolean getBoolean(Object array, int index) + { + if (array instanceof boolean[]) + return ((boolean[]) array)[index]; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a byte array. + * + * @param array the array to access + * @param index the array index to access + * @return the byte element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static byte getByte(Object array, int index) + { + if (array instanceof byte[]) + return ((byte[]) array)[index]; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a char array. + * + * @param array the array to access + * @param index the array index to access + * @return the char element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a char + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static char getChar(Object array, int index) + { + if (array instanceof char[]) + return ((char[]) array)[index]; + if (array == null) + throw new NullPointerException(); + throw new IllegalArgumentException(); + } + + /** + * Gets an element of a short array. + * + * @param array the array to access + * @param index the array index to access + * @return the short element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte + * or char array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static short getShort(Object array, int index) + { + if (array instanceof short[]) + return ((short[]) array)[index]; + return getByte(array, index); + } + + /** + * Gets an element of an int array. + * + * @param array the array to access + * @param index the array index to access + * @return the int element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, or int array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static int getInt(Object array, int index) + { + if (array instanceof int[]) + return ((int[]) array)[index]; + if (array instanceof char[]) + return ((char[]) array)[index]; + return getShort(array, index); + } + + /** + * Gets an element of a long array. + * + * @param array the array to access + * @param index the array index to access + * @return the long element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, int, or long array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static long getLong(Object array, int index) + { + if (array instanceof long[]) + return ((long[]) array)[index]; + return getInt(array, index); + } + + /** + * Gets an element of a float array. + * + * @param array the array to access + * @param index the array index to access + * @return the float element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, int, long, or float array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static float getFloat(Object array, int index) + { + if (array instanceof float[]) + return ((float[]) array)[index]; + return getLong(array, index); + } + + /** + * Gets an element of a double array. + * + * @param array the array to access + * @param index the array index to access + * @return the double element at <code>array[index]</code> + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * char, short, int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #get(Object, int) + */ + public static double getDouble(Object array, int index) + { + if (array instanceof double[]) + return ((double[]) array)[index]; + return getFloat(array, index); + } + + /** + * Sets an element of an array. If the array is primitive, then the new + * value is unwrapped and widened. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not an array, + * or the array is primitive and unwrapping value fails, or the + * value is not assignable to the array component type + * @throws NullPointerException if array is null, or if array is primitive + * and value is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #setBoolean(Object, int, boolean) + * @see #setByte(Object, int, byte) + * @see #setChar(Object, int, char) + * @see #setShort(Object, int, short) + * @see #setInt(Object, int, int) + * @see #setLong(Object, int, long) + * @see #setFloat(Object, int, float) + * @see #setDouble(Object, int, double) + */ + public static void set(Object array, int index, Object value) + { + if (array instanceof Object[]) + { + // Too bad the API won't let us throw the easier ArrayStoreException! + if (value != null + && ! array.getClass().getComponentType().isInstance(value)) + throw new IllegalArgumentException(); + ((Object[]) array)[index] = value; + } + else if (value instanceof Byte) + setByte(array, index, ((Byte) value).byteValue()); + else if (value instanceof Short) + setShort(array, index, ((Short) value).shortValue()); + else if (value instanceof Integer) + setInt(array, index, ((Integer) value).intValue()); + else if (value instanceof Long) + setLong(array, index, ((Long) value).longValue()); + else if (value instanceof Float) + setFloat(array, index, ((Float) value).floatValue()); + else if (value instanceof Double) + setDouble(array, index, ((Double) value).doubleValue()); + else if (value instanceof Character) + setChar(array, index, ((Character) value).charValue()); + else if (value instanceof Boolean) + setBoolean(array, index, ((Boolean) value).booleanValue()); + else if (array == null) + throw new NullPointerException(); + else + throw new IllegalArgumentException(); + } + + /** + * Sets an element of a boolean array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a boolean + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setBoolean(Object array, int index, boolean value) + { + if (array instanceof boolean[]) + ((boolean[]) array)[index] = value; + else if (array == null) + throw new NullPointerException(); + else + throw new IllegalArgumentException(); + } + + /** + * Sets an element of a byte array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a byte, + * short, int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setByte(Object array, int index, byte value) + { + if (array instanceof byte[]) + ((byte[]) array)[index] = value; + else + setShort(array, index, value); + } + + /** + * Sets an element of a char array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a char, + * int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setChar(Object array, int index, char value) + { + if (array instanceof char[]) + ((char[]) array)[index] = value; + else + setInt(array, index, value); + } + + /** + * Sets an element of a short array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a short, + * int, long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setShort(Object array, int index, short value) + { + if (array instanceof short[]) + ((short[]) array)[index] = value; + else + setInt(array, index, value); + } + + /** + * Sets an element of an int array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not an int, + * long, float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setInt(Object array, int index, int value) + { + if (array instanceof int[]) + ((int[]) array)[index] = value; + else + setLong(array, index, value); + } + + /** + * Sets an element of a long array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a long, + * float, or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setLong(Object array, int index, long value) + { + if (array instanceof long[]) + ((long[]) array)[index] = value; + else + setFloat(array, index, value); + } + + /** + * Sets an element of a float array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a float + * or double array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setFloat(Object array, int index, float value) + { + if (array instanceof float[]) + ((float[]) array)[index] = value; + else + setDouble(array, index, value); + } + + /** + * Sets an element of a double array. + * + * @param array the array to set a value of + * @param index the array index to set the value to + * @param value the value to set + * @throws IllegalArgumentException if <code>array</code> is not a double + * array + * @throws NullPointerException if <code>array</code> is null + * @throws ArrayIndexOutOfBoundsException if <code>index</code> is out of + * bounds + * @see #set(Object, int, Object) + */ + public static void setDouble(Object array, int index, double value) + { + if (array instanceof double[]) + ((double[]) array)[index] = value; + else if (array == null) + throw new NullPointerException(); + else + throw new IllegalArgumentException(); + } + + /** + * Dynamically and recursively create a multi-dimensioned array of objects. + * + * @param type guaranteed to be a valid object type + * @param dimensions the dimensions of the array + * @param index index of the current dimension to build + * @return the new multi-dimensioned array + * @throws NegativeArraySizeException if any entry of dimensions is negative + * @throws OutOfMemoryError if memory allocation fails + */ + // This would be faster if implemented natively, using the multianewarray + // bytecode instead of this recursive call + private static Object createMultiArray(Class type, int[] dimensions, + int index) + { + if (index == 0) + return newInstance(type, dimensions[0]); + + Object toAdd = createMultiArray(type, dimensions, index - 1); + Class thisType = toAdd.getClass(); + Object[] retval + = (Object[]) createObjectArray(thisType, dimensions[index]); + if (dimensions[index] > 0) + retval[0] = toAdd; + int i = dimensions[index]; + while (--i > 0) + retval[i] = createMultiArray(type, dimensions, index - 1); + return retval; + } + + /** + * Dynamically create an array of objects. + * + * @param type guaranteed to be a valid object type + * @param dim the length of the array + * @return the new array + * @throws NegativeArraySizeException if dim is negative + * @throws OutOfMemoryError if memory allocation fails + */ + private static native Object createObjectArray(Class type, int dim); +} diff --git a/libjava/classpath/java/lang/reflect/GenericArrayType.java b/libjava/classpath/java/lang/reflect/GenericArrayType.java new file mode 100644 index 00000000000..8dc33a796c5 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/GenericArrayType.java @@ -0,0 +1,61 @@ +/* GenericArrayType.java - Represent an array type with a generic component + Copyright (C) 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Represents the type of an array's components, which may be + * either a parameterized type or a type variable. + * + * @author Tom Tromey (tromey@redhat.com) + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + */ +public interface GenericArrayType + extends Type +{ + + /** + * Returns the <code>Type</code> of the components within the array. + * + * @return a <code>Type</code> instance representing the type of + * the array's components. + */ + Type getGenericComponentType(); + +} diff --git a/libjava/classpath/java/lang/reflect/GenericSignatureFormatError.java b/libjava/classpath/java/lang/reflect/GenericSignatureFormatError.java new file mode 100644 index 00000000000..ab6928de6c0 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/GenericSignatureFormatError.java @@ -0,0 +1,62 @@ +/* GenericSignatureFormatError.java - Thrown when a signature is malformed. + Copyright (C) 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Thrown on encountering a syntactically malformed signature in + * a reflective method. During reflection, the generic type signature + * of a type, method or constructor may be interpreted by the virtual + * machine. This error is thrown if this operation fails. + * + * @author Tom Tromey (tromey@redhat.com) + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + */ +public class GenericSignatureFormatError + extends ClassFormatError +{ + + /** + * Constructs a new <code>GenericSignatureFormatError</code>. + */ + public GenericSignatureFormatError() + { + } + +} diff --git a/libjava/classpath/java/lang/reflect/InvocationHandler.java b/libjava/classpath/java/lang/reflect/InvocationHandler.java new file mode 100644 index 00000000000..208e621eedc --- /dev/null +++ b/libjava/classpath/java/lang/reflect/InvocationHandler.java @@ -0,0 +1,137 @@ +/* java.lang.reflect.InvocationHandler - dynamically executes methods in + proxy instances + Copyright (C) 2001 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * This interface defines an invocation handler. Suppose you are using + * reflection, and found a method that requires that its parameter + * be an object of a given interface. You want to call this method, + * but have no idea what classes implement that interface. So, you can + * create a {@link Proxy} instance, a convenient way to dynamically + * generate a class that meets all the necessary properties of that + * interface. But in order for the proxy instance to do any good, it + * needs to know what to do when interface methods are invoked! So, + * this interface is basically a cool wrapper that provides runtime + * code generation needed by proxy instances. + * + * <p>While this interface was designed for use by Proxy, it will also + * work on any object in general.</p> + * + * <p>Hints for implementing this class:</p> + * + * <ul> + * <li>Don't forget that Object.equals, Object.hashCode, and + * Object.toString will call this handler. In particular, + * a naive call to proxy.equals, proxy.hashCode, or proxy.toString + * will put you in an infinite loop. And remember that string + * concatenation also invokes toString.</li> + * <li>Obey the contract of the Method object you are handling, or + * the proxy instance will be forced to throw a + * {@link NullPointerException}, {@link ClassCastException}, + * or {@link UndeclaredThrowableException}.</li> + * <li>Be prepared to wrap/unwrap primitives as necessary.</li> + * <li>The Method object may be owned by a different interface than + * what was actually used as the qualifying type of the method + * invocation in the Java source code. This means that it might + * not always be safe to throw an exception listed as belonging + * to the method's throws clause.</li> + * </ul> + * + * <p><small>For a fun time, create an InvocationHandler that handles the + * methods of a proxy instance of the InvocationHandler interface!</small></p> + * + * @see Proxy + * @see UndeclaredThrowableException + * + * @author Eric Blake (ebb9@email.byu.edu) + * @since 1.3 + * @status updated to 1.4 + */ +public interface InvocationHandler +{ + /** + * When a method is invoked on a proxy instance, it is wrapped and + * this method is called instead, so that you may decide at runtime + * how the original method should behave. + * + * @param proxy the instance that the wrapped method should be + * invoked on. When this method is called by a Proxy object, + * `proxy' will be an instance of {@link Proxy}, and oddly enough, + * <code>Proxy.getInvocationHandler(proxy)</code> will return + * <code>this</code>! + * @param method the reflected method to invoke on the proxy. + * When this method is called by a Proxy object, 'method' + * will be the reflection object owned by the declaring + * class or interface, which may be a supertype of the + * interfaces the proxy directly implements. + * @param args the arguments passed to the original method, or + * <code>null</code> if the method takes no arguments. + * (But also be prepared to handle a 0-length array). + * Arguments of primitive type, such as <code>boolean</code> + * or <code>int</code>, are wrapped in the appropriate + * class such as {@link Boolean} or {@link Integer}. + * @return whatever is necessary to return from the wrapped method. + * If the wrapped method is <code>void</code>, the proxy + * instance will ignore it. If the wrapped method returns + * a primitive, this must be the correct wrapper type whose value + * is exactly assignable to the appropriate type (no widening + * will be performed); a null object in this case causes a + * {@link NullPointerException}. In all remaining cases, if + * the returned object is not assignment compatible to the + * declared type of the original method, the proxy instance + * will generate a {@link ClassCastException}. + * @throws Throwable this interface is listed as throwing anything, + * but the implementation should only throw unchecked + * exceptions and exceptions listed in the throws clause of + * all methods being overridden by the proxy instance. If + * something is thrown that is not compatible with the throws + * clause of all overridden methods, the proxy instance will + * wrap the exception in an UndeclaredThrowableException. + * Note that an exception listed in the throws clause of the + * `method' parameter might not be declared in additional + * interfaces also implemented by the proxy object. + * + * @see Proxy + * @see UndeclaredThrowableException + */ + Object invoke(Object proxy, Method method, Object[] args) + throws Throwable; + +} diff --git a/libjava/classpath/java/lang/reflect/InvocationTargetException.java b/libjava/classpath/java/lang/reflect/InvocationTargetException.java new file mode 100644 index 00000000000..af79d3a199d --- /dev/null +++ b/libjava/classpath/java/lang/reflect/InvocationTargetException.java @@ -0,0 +1,123 @@ +/* InvocationTargetException.java -- Wrapper exception for reflection + Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * InvocationTargetException is sort of a way to "wrap" whatever exception + * comes up when a method or constructor is called via Reflection. As of + * JDK 1.4, it was retrofitted to match the exception chaining of all other + * exceptions, but <code>getTargetException()</code> still works. + * + * @author John Keiser + * @author Tom Tromey (tromey@cygnus.com) + * @author Eric Blake (ebb9@email.byu.edu) + * @see Method#invoke(Object,Object[]) + * @see Constructor#newInstance(Object[]) + * @since 1.1 + * @status updated to 1.4 + */ +public class InvocationTargetException extends Exception +{ + /** + * Compatible with JDK 1.1+. + */ + private static final long serialVersionUID = 4085088731926701167L; + + /** + * The chained exception. This field is only around for serial compatibility. + * + * @serial the chained exception + */ + private final Throwable target; + + /** + * Construct an exception with null as the cause. The cause is initialized + * to null. + */ + protected InvocationTargetException() + { + this(null, null); + } + + /** + * Create an <code>InvocationTargetException</code> using another + * exception. + * + * @param targetException the exception to wrap + */ + public InvocationTargetException(Throwable targetException) + { + this(targetException, null); + } + + /** + * Create an <code>InvocationTargetException</code> using another + * exception and an error message. + * + * @param targetException the exception to wrap + * @param err an extra reason for the exception-throwing + */ + public InvocationTargetException(Throwable targetException, String err) + { + super(err, targetException); + target = targetException; + } + + /** + * Get the wrapped (targeted) exception. + * + * @return the targeted exception + * @see #getCause() + */ + public Throwable getTargetException() + { + return target; + } + + /** + * Returns the cause of this exception (which may be null). + * + * @return the cause + * @since 1.4 + */ + public Throwable getCause() + { + return target; + } +} diff --git a/libjava/classpath/java/lang/reflect/Member.java b/libjava/classpath/java/lang/reflect/Member.java new file mode 100644 index 00000000000..9983b275a94 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/Member.java @@ -0,0 +1,100 @@ +/* java.lang.reflect.Member - common query methods in reflection + Copyright (C) 1998, 1999, 2001, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Member is an interface that represents any member of a class (field or + * method) or a constructor. You can get information about the declaring + * class, name or modifiers of the member with this interface. + * + * @author John Keiser + * @author Per Bothner (bothner@cygnus.com) + * @author Eric Blake (ebb9@email.byu.edu) + * @see Class + * @see Field + * @see Method + * @see Constructor + * @since 1.1 + * @status updated to 1.4 + */ +public interface Member +{ + /** + * Represents all members, whether public, private, protected or + * package-protected, but only which are declared in this class. + * Used in SecurityManager.checkMemberAccess() to determine the + * type of members to access. + * @see SecurityManager#checkMemberAccess() + */ + int DECLARED = 1; + + /** + * Represents public members only, but includes all inherited members. + * Used in SecurityManager.checkMemberAccess() to determine the type of + * members to access. + * @see SecurityManager#checkMemberAccess() + */ + int PUBLIC = 0; + + /** + * Gets the class that declared this member. This is not the class where + * this method was called, or even the class where this Member object + * came to life, but the class that declares the member this represents. + * + * @return the class that declared this member + */ + Class getDeclaringClass(); + + /** + * Gets the simple name of this member. This will be a valid Java + * identifier, with no qualification. + * + * @return the name of this member + */ + String getName(); + + /** + * Gets the modifiers this member uses. Use the <code>Modifier</code> + * class to interpret the values. + * + * @return an integer representing the modifiers to this Member + * @see Modifier + */ + int getModifiers(); +} diff --git a/libjava/classpath/java/lang/reflect/Modifier.java b/libjava/classpath/java/lang/reflect/Modifier.java new file mode 100644 index 00000000000..efc88c941db --- /dev/null +++ b/libjava/classpath/java/lang/reflect/Modifier.java @@ -0,0 +1,332 @@ +/* java.lang.reflect.Modifier + Copyright (C) 1998, 1999, 2001, 2002, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Modifier is a helper class with static methods to determine whether an + * int returned from getModifiers() represents static, public, protected, + * native, final, etc... and provides an additional method to print + * out all of the modifiers in an int in order. + * <p> + * The methods in this class use the bitmask values in the VM spec to + * determine the modifiers of an int. This means that a VM must return a + * standard mask, conformant with the VM spec. I don't know if this is how + * Sun does it, but I'm willing to bet money that it is. + * + * @author John Keiser + * @author Tom Tromey (tromey@cygnus.com) + * @author Eric Blake (ebb9@email.byu.edu) + * @see Member#getModifiers() + * @see Method#getModifiers() + * @see Field#getModifiers() + * @see Constructor#getModifiers() + * @see Class#getModifiers() + * @since 1.1 + */ +public class Modifier +{ + /** <STRONG>This constructor really shouldn't be here ... there are no + * instance methods or variables of this class, so instantiation is + * worthless. However, this function is in the 1.1 spec, so it is added + * for completeness.</STRONG> + */ + public Modifier() + { + } + + /** + * Public: accessible from any other class. + */ + public static final int PUBLIC = 0x0001; + + /** + * Private: accessible only from the same enclosing class. + */ + public static final int PRIVATE = 0x0002; + + /** + * Protected: accessible only to subclasses, or within the package. + */ + public static final int PROTECTED = 0x0004; + + /** + * Static:<br><ul> + * <li>Class: no enclosing instance for nested class.</li> + * <li>Field or Method: can be accessed or invoked without an + * instance of the declaring class.</li> + * </ul> + */ + public static final int STATIC = 0x0008; + + /** + * Final:<br><ul> + * <li>Class: no subclasses allowed.</li> + * <li>Field: cannot be changed.</li> + * <li>Method: cannot be overriden.</li> + * </ul> + */ + public static final int FINAL = 0x0010; + + /** + * Synchronized: Method: lock the class while calling this method. + */ + public static final int SYNCHRONIZED = 0x0020; + + /** + * Volatile: Field: cannot be cached. + */ + public static final int VOLATILE = 0x0040; + + /** + * Transient: Field: not serialized or deserialized. + */ + public static final int TRANSIENT = 0x0080; + + /** + * Native: Method: use JNI to call this method. + */ + public static final int NATIVE = 0x0100; + + /** + * Interface: Class: is an interface. + */ + public static final int INTERFACE = 0x0200; + + /** + * Abstract:<br><ul> + * <li>Class: may not be instantiated.</li> + * <li>Method: may not be called.</li> + * </ul> + */ + public static final int ABSTRACT = 0x0400; + + /** + * Strictfp: Method: expressions are FP-strict.<p> + * Also used as a modifier for classes, to mean that all initializers + * and constructors are FP-strict, but does not show up in + * Class.getModifiers. + */ + public static final int STRICT = 0x0800; + + + /** + * Super - treat invokespecial as polymorphic so that super.foo() works + * according to the JLS. This is a reuse of the synchronized constant + * to patch a hole in JDK 1.0. *shudder*. + */ + static final int SUPER = 0x0020; + + /** + * All the flags, only used by code in this package. + */ + static final int ALL_FLAGS = 0xfff; + + /** + * Check whether the given modifier is abstract. + * @param mod the modifier. + * @return <code>true</code> if abstract, <code>false</code> otherwise. + */ + public static boolean isAbstract(int mod) + { + return (mod & ABSTRACT) != 0; + } + + /** + * Check whether the given modifier is final. + * @param mod the modifier. + * @return <code>true</code> if final, <code>false</code> otherwise. + */ + public static boolean isFinal(int mod) + { + return (mod & FINAL) != 0; + } + + /** + * Check whether the given modifier is an interface. + * @param mod the modifier. + * @return <code>true</code> if an interface, <code>false</code> otherwise. + */ + public static boolean isInterface(int mod) + { + return (mod & INTERFACE) != 0; + } + + /** + * Check whether the given modifier is native. + * @param mod the modifier. + * @return <code>true</code> if native, <code>false</code> otherwise. + */ + public static boolean isNative(int mod) + { + return (mod & NATIVE) != 0; + } + + /** + * Check whether the given modifier is private. + * @param mod the modifier. + * @return <code>true</code> if private, <code>false</code> otherwise. + */ + public static boolean isPrivate(int mod) + { + return (mod & PRIVATE) != 0; + } + + /** + * Check whether the given modifier is protected. + * @param mod the modifier. + * @return <code>true</code> if protected, <code>false</code> otherwise. + */ + public static boolean isProtected(int mod) + { + return (mod & PROTECTED) != 0; + } + + /** + * Check whether the given modifier is public. + * @param mod the modifier. + * @return <code>true</code> if public, <code>false</code> otherwise. + */ + public static boolean isPublic(int mod) + { + return (mod & PUBLIC) != 0; + } + + /** + * Check whether the given modifier is static. + * @param mod the modifier. + * @return <code>true</code> if static, <code>false</code> otherwise. + */ + public static boolean isStatic(int mod) + { + return (mod & STATIC) != 0; + } + + /** + * Check whether the given modifier is strictfp. + * @param mod the modifier. + * @return <code>true</code> if strictfp, <code>false</code> otherwise. + */ + public static boolean isStrict(int mod) + { + return (mod & STRICT) != 0; + } + + /** + * Check whether the given modifier is synchronized. + * @param mod the modifier. + * @return <code>true</code> if synchronized, <code>false</code> otherwise. + */ + public static boolean isSynchronized(int mod) + { + return (mod & SYNCHRONIZED) != 0; + } + + /** + * Check whether the given modifier is transient. + * @param mod the modifier. + * @return <code>true</code> if transient, <code>false</code> otherwise. + */ + public static boolean isTransient(int mod) + { + return (mod & TRANSIENT) != 0; + } + + /** + * Check whether the given modifier is volatile. + * @param mod the modifier. + * @return <code>true</code> if volatile, <code>false</code> otherwise. + */ + public static boolean isVolatile(int mod) + { + return (mod & VOLATILE) != 0; + } + + /** + * Get a string representation of all the modifiers represented by the + * given int. The keywords are printed in this order: + * <code><public|protected|private> abstract static final transient + * volatile synchronized native strictfp interface</code>. + * + * @param mod the modifier. + * @return the String representing the modifiers. + */ + public static String toString(int mod) + { + return toString(mod, new StringBuffer()).toString(); + } + + /** + * Package helper method that can take a StringBuffer. + * @param mod the modifier + * @param r the StringBuffer to which the String representation is appended + * @return r, with information appended + */ + static StringBuffer toString(int mod, StringBuffer r) + { + if (isPublic(mod)) + r.append("public "); + if (isProtected(mod)) + r.append("protected "); + if (isPrivate(mod)) + r.append("private "); + if (isAbstract(mod)) + r.append("abstract "); + if (isStatic(mod)) + r.append("static "); + if (isFinal(mod)) + r.append("final "); + if (isTransient(mod)) + r.append("transient "); + if (isVolatile(mod)) + r.append("volatile "); + if (isSynchronized(mod)) + r.append("synchronized "); + if (isNative(mod)) + r.append("native "); + if (isStrict(mod)) + r.append("strictfp "); + if (isInterface(mod)) + r.append("interface "); + + // Trim trailing space. + if ((mod & ALL_FLAGS) != 0) + r.setLength(r.length() - 1); + return r; + } +} diff --git a/libjava/classpath/java/lang/reflect/ParameterizedType.java b/libjava/classpath/java/lang/reflect/ParameterizedType.java new file mode 100644 index 00000000000..61081c962db --- /dev/null +++ b/libjava/classpath/java/lang/reflect/ParameterizedType.java @@ -0,0 +1,122 @@ +/* ParameterizedType.java -- Represents parameterized types e.g. List<String> + Copyright (C) 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * <p> + * Represents a type which is parameterized over one or more other + * types. For example, <code>List<Integer></code> is a parameterized + * type, with <code>List</code> parameterized over the type + * <code>Integer</code>. + * </p> + * <p> + * Instances of this classes are created as needed, during reflection. + * On creating a parameterized type, <code>p</code>, the + * <code>GenericTypeDeclaration</code> corresponding to <code>p</code> + * is created and resolved. Each type argument of <code>p</code> + * is then created recursively; details of this process are availble + * in the documentation of <code>TypeVariable</code>. This creation + * process only happens once; repetition has no effect. + * </p> + * <p> + * Implementors of this interface must implement an appropriate + * <code>equals()</code> method. This method should equate any + * two instances of the implementing class that have the same + * <code>GenericTypeDeclaration</code> and <code>Type</code> + * parameters. + * + * @author Tom Tromey (tromey@redhat.com) + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @see GenericTypeDeclaration + * @see TypeVariable + * @since 1.5 + */ +public interface ParameterizedType + extends Type +{ + + /** + * <p> + * Returns an array of <code>Type</code> objects, which gives + * the parameters of this type. + * </p> + * <p> + * <strong>Note</code>: the returned array may be empty. This + * occurs if the supposed <code>ParameterizedType</code> is simply + * a normal type wrapped inside a parameterized type. + * </p> + * + * @return an array of <code>Type</code>s, representing the arguments + * of this type. + * @throws TypeNotPresentException if any of the types referred to by + * the parameters of this type do not actually exist. + * @throws MalformedParameterizedTypeException if any of the types + * refer to a type which can not be instantiated. + */ + Type[] getActualTypeArguments(); + + /** + * Returns the type of which this type is a member. For example, + * in <code>Top<String>.Bottom<Integer></code>, + * <code>Bottom<Integer></code> is a member of + * <code>Top<String></code>, and so the latter is returned + * by this method. Calling this method on top-level types (such as + * <code>Top<String></code>) returns null. + * + * @return the type which owns this type. + * @throws TypeNotPresentException if the owner type referred to by + * this type do not actually exist. + * @throws MalformedParameterizedTypeException if the owner type + * referred to by this type can not be instantiated. + */ + Type getOwnerType(); + + /** + * Returns a version of this type without parameters, which corresponds + * to the class or interface which declared the type. For example, + * the raw type corresponding to <code>List<Double></code> + * is <code>List</code>, which was declared by the <code>List</code> + * class. + * + * @return the raw variant of this type (i.e. the type without + * parameters). + */ + Type getRawType(); + +} diff --git a/libjava/classpath/java/lang/reflect/Proxy.java b/libjava/classpath/java/lang/reflect/Proxy.java new file mode 100644 index 00000000000..dc1ac87e4e1 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/Proxy.java @@ -0,0 +1,1615 @@ +/* Proxy.java -- build a proxy class that implements reflected interfaces + Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +import gnu.classpath.Configuration; +import gnu.java.lang.reflect.TypeSignature; + +import java.io.Serializable; +import java.security.ProtectionDomain; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Map; +import java.util.Set; + +/** + * This class allows you to dynamically create an instance of any (or + * even multiple) interfaces by reflection, and decide at runtime + * how that instance will behave by giving it an appropriate + * {@link InvocationHandler}. Proxy classes serialize specially, so + * that the proxy object can be reused between VMs, without requiring + * a persistent copy of the generated class code. + * + * <h3>Creation</h3> + * To create a proxy for some interface Foo: + * + * <pre> + * InvocationHandler handler = new MyInvocationHandler(...); + * Class proxyClass = Proxy.getProxyClass( + * Foo.class.getClassLoader(), new Class[] { Foo.class }); + * Foo f = (Foo) proxyClass + * .getConstructor(new Class[] { InvocationHandler.class }) + * .newInstance(new Object[] { handler }); + * </pre> + * or more simply: + * <pre> + * Foo f = (Foo) Proxy.newProxyInstance(Foo.class.getClassLoader(), + * new Class[] { Foo.class }, + * handler); + * </pre> + * + * <h3>Dynamic Proxy Classes</h3> + * A dynamic proxy class is created at runtime, and has the following + * properties: + * <ul> + * <li>The class is <code>public</code> and <code>final</code>, + * and is neither <code>abstract</code> nor an inner class.</li> + * <li>The class has no canonical name (there is no formula you can use + * to determine or generate its name), but begins with the + * sequence "$Proxy". Abuse this knowledge at your own peril. + * (For now, '$' in user identifiers is legal, but it may not + * be that way forever. You weren't using '$' in your + * identifiers, were you?)</li> + * <li>The class extends Proxy, and explicitly implements all the + * interfaces specified at creation, in order (this is important + * for determining how method invocation is resolved). Note that + * a proxy class implements {@link Serializable}, at least + * implicitly, since Proxy does, but true serial behavior + * depends on using a serializable invocation handler as well.</li> + * <li>If at least one interface is non-public, the proxy class + * will be in the same package. Otherwise, the package is + * unspecified. This will work even if the package is sealed + * from user-generated classes, because Proxy classes are + * generated by a trusted source. Meanwhile, the proxy class + * belongs to the classloader you designated.</li> + * <li>Reflection works as expected: {@link Class#getInterfaces()} and + * {@link Class#getMethods()} work as they do on normal classes.</li> + * <li>The method {@link #isProxyClass()} will distinguish between + * true proxy classes and user extensions of this class. It only + * returns true for classes created by {@link #getProxyClass}.</li> + * <li>The {@link ProtectionDomain} of a proxy class is the same as for + * bootstrap classes, such as Object or Proxy, since it is created by + * a trusted source. This protection domain will typically be granted + * {@link java.security.AllPermission}. But this is not a security + * risk, since there are adequate permissions on reflection, which is + * the only way to create an instance of the proxy class.</li> + * <li>The proxy class contains a single constructor, which takes as + * its only argument an {@link InvocationHandler}. The method + * {@link #newInstance} is shorthand to do the necessary + * reflection.</li> + * </ul> + * + * <h3>Proxy Instances</h3> + * A proxy instance is an instance of a proxy class. It has the + * following properties, many of which follow from the properties of a + * proxy class listed above: + * <ul> + * <li>For a proxy class with Foo listed as one of its interfaces, the + * expression <code>proxy instanceof Foo</code> will return true, + * and the expression <code>(Foo) proxy</code> will succeed without + * a {@link ClassCastException}.</li> + * <li>Each proxy instance has an invocation handler, which can be + * accessed by {@link #getInvocationHandler(Object)}. Any call + * to an interface method, including {@link Object#hashcode()}, + * {@link Object#equals(Object)}, or {@link Object#toString()}, + * but excluding the public final methods of Object, will be + * encoded and passed to the {@link InvocationHandler#invoke} + * method of this handler.</li> + * </ul> + * + * <h3>Inheritance Issues</h3> + * A proxy class may inherit a method from more than one interface. + * The order in which interfaces are listed matters, because it determines + * which reflected {@link Method} object will be passed to the invocation + * handler. This means that the dynamically generated class cannot + * determine through which interface a method is being invoked.<p> + * + * In short, if a method is declared in Object (namely, hashCode, + * equals, or toString), then Object will be used; otherwise, the + * leftmost interface that inherits or declares a method will be used, + * even if it has a more permissive throws clause than what the proxy + * class is allowed. Thus, in the invocation handler, it is not always + * safe to assume that every class listed in the throws clause of the + * passed Method object can safely be thrown; fortunately, the Proxy + * instance is robust enough to wrap all illegal checked exceptions in + * {@link UndeclaredThrowableException}. + * + * @see InvocationHandler + * @see UndeclaredThrowableException + * @see Class + * @author Eric Blake (ebb9@email.byu.edu) + * @since 1.3 + * @status updated to 1.4, except for the use of ProtectionDomain + */ +public class Proxy implements Serializable +{ + /** + * Compatible with JDK 1.3+. + */ + private static final long serialVersionUID = -2222568056686623797L; + + /** + * Map of ProxyType to proxy class. + * + * @XXX This prevents proxy classes from being garbage collected. + * java.util.WeakHashSet is not appropriate, because that collects the + * keys, but we are interested in collecting the elements. + */ + private static final Map proxyClasses = new HashMap(); + + /** + * The invocation handler for this proxy instance. For Proxy, this + * field is unused, but it appears here in order to be serialized in all + * proxy classes. + * + * <em>NOTE</em>: This implementation is more secure for proxy classes + * than what Sun specifies. Sun does not require h to be immutable, but + * this means you could change h after the fact by reflection. However, + * by making h immutable, we may break non-proxy classes which extend + * Proxy. + * @serial invocation handler associated with this proxy instance + */ + protected InvocationHandler h; + + /** + * Constructs a new Proxy from a subclass (usually a proxy class), + * with the specified invocation handler. + * + * <em>NOTE</em>: This throws a NullPointerException if you attempt + * to create a proxy instance with a null handler using reflection. + * This behavior is not yet specified by Sun; see Sun Bug 4487672. + * + * @param handler the invocation handler, may be null if the subclass + * is not a proxy class + * @throws NullPointerException if handler is null and this is a proxy + * instance + */ + protected Proxy(InvocationHandler handler) + { + if (handler == null && isProxyClass(getClass())) + throw new NullPointerException("invalid handler"); + h = handler; + } + + /** + * Returns the proxy {@link Class} for the given ClassLoader and array + * of interfaces, dynamically generating it if necessary. + * + * <p>There are several restrictions on this method, the violation of + * which will result in an IllegalArgumentException or + * NullPointerException:</p> + * + * <ul> + * <li>All objects in `interfaces' must represent distinct interfaces. + * Classes, primitive types, null, and duplicates are forbidden.</li> + * <li>The interfaces must be visible in the specified ClassLoader. + * In other words, for each interface i: + * <code>Class.forName(i.getName(), false, loader) == i</code> + * must be true.</li> + * <li>All non-public interfaces (if any) must reside in the same + * package, or the proxy class would be non-instantiable. If + * there are no non-public interfaces, the package of the proxy + * class is unspecified.</li> + * <li>All interfaces must be compatible - if two declare a method + * with the same name and parameters, the return type must be + * the same and the throws clause of the proxy class will be + * the maximal subset of subclasses of the throws clauses for + * each method that is overridden.</li> + * <li>VM constraints limit the number of interfaces a proxy class + * may directly implement (however, the indirect inheritance + * of {@link Serializable} does not count against this limit). + * Even though most VMs can theoretically have 65535 + * superinterfaces for a class, the actual limit is smaller + * because a class's constant pool is limited to 65535 entries, + * and not all entries can be interfaces.</li> + * </ul> + * + * <p>Note that different orders of interfaces produce distinct classes.</p> + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @param interfaces the array of interfaces the proxy class implements, + * may be empty, but not null + * @return the Class object of the proxy class + * @throws IllegalArgumentException if the constraints above were + * violated, except for problems with null + * @throws NullPointerException if `interfaces' is null or contains + * a null entry + */ + // synchronized so that we aren't trying to build the same class + // simultaneously in two threads + public static synchronized Class getProxyClass(ClassLoader loader, + Class[] interfaces) + { + interfaces = (Class[]) interfaces.clone(); + ProxyType pt = new ProxyType(loader, interfaces); + Class clazz = (Class) proxyClasses.get(pt); + if (clazz == null) + { + if (Configuration.HAVE_NATIVE_GET_PROXY_CLASS) + clazz = getProxyClass0(loader, interfaces); + else + { + ProxyData data = (Configuration.HAVE_NATIVE_GET_PROXY_DATA + ? getProxyData0(loader, interfaces) + : ProxyData.getProxyData(pt)); + + clazz = (Configuration.HAVE_NATIVE_GENERATE_PROXY_CLASS + ? generateProxyClass0(loader, data) + : new ClassFactory(data).generate(loader)); + } + + Object check = proxyClasses.put(pt, clazz); + // assert check == null && clazz != null; + if (check != null || clazz == null) + throw new InternalError(/*"Fatal flaw in getProxyClass"*/); + } + return clazz; + } + + /** + * Combines several methods into one. This is equivalent to: + * <pre> + * Proxy.getProxyClass(loader, interfaces) + * .getConstructor(new Class[] {InvocationHandler.class}) + * .newInstance(new Object[] {handler}); + * </pre> + * except that it will not fail with the normal problems caused + * by reflection. It can still fail for the same reasons documented + * in getProxyClass, or if handler is null. + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @param interfaces the array of interfaces the proxy class implements, + * may be empty, but not null + * @param handler the invocation handler, may not be null + * @return a proxy instance implementing the specified interfaces + * @throws IllegalArgumentException if the constraints for getProxyClass + * were violated, except for problems with null + * @throws NullPointerException if `interfaces' is null or contains + * a null entry, or if handler is null + * @see #getProxyClass(ClassLoader, Class[]) + * @see Class#getConstructor(Class[]) + * @see Constructor#newInstance(Object[]) + */ + public static Object newProxyInstance(ClassLoader loader, + Class[] interfaces, + InvocationHandler handler) + { + try + { + // getProxyClass() and Proxy() throw the necessary exceptions + return getProxyClass(loader, interfaces) + .getConstructor(new Class[] {InvocationHandler.class}) + .newInstance(new Object[] {handler}); + } + catch (RuntimeException e) + { + // Let IllegalArgumentException, NullPointerException escape. + // assert e instanceof IllegalArgumentException + // || e instanceof NullPointerException; + throw e; + } + catch (InvocationTargetException e) + { + // Let wrapped NullPointerException escape. + // assert e.getTargetException() instanceof NullPointerException + throw (NullPointerException) e.getCause(); + } + catch (Exception e) + { + // Covers InstantiationException, IllegalAccessException, + // NoSuchMethodException, none of which should be generated + // if the proxy class was generated correctly. + // assert false; + throw (Error) new InternalError("Unexpected: " + e).initCause(e); + } + } + + /** + * Returns true if and only if the Class object is a dynamically created + * proxy class (created by <code>getProxyClass</code> or by the + * syntactic sugar of <code>newProxyInstance</code>). + * + * <p>This check is secure (in other words, it is not simply + * <code>clazz.getSuperclass() == Proxy.class</code>), it will not + * be spoofed by non-proxy classes that extend Proxy. + * + * @param clazz the class to check, must not be null + * @return true if the class represents a proxy class + * @throws NullPointerException if clazz is null + */ + // This is synchronized on the off chance that another thread is + // trying to add a class to the map at the same time we read it. + public static synchronized boolean isProxyClass(Class clazz) + { + if (! Proxy.class.isAssignableFrom(clazz)) + return false; + // This is a linear search, even though we could do an O(1) search + // using new ProxyType(clazz.getClassLoader(), clazz.getInterfaces()). + return proxyClasses.containsValue(clazz); + } + + /** + * Returns the invocation handler for the given proxy instance.<p> + * + * <em>NOTE</em>: We guarantee a non-null result if successful, + * but Sun allows the creation of a proxy instance with a null + * handler. See the comments for {@link #Proxy(InvocationHandler)}. + * + * @param proxy the proxy instance, must not be null + * @return the invocation handler, guaranteed non-null. + * @throws IllegalArgumentException if + * <code>Proxy.isProxyClass(proxy.getClass())</code> returns false. + * @throws NullPointerException if proxy is null + */ + public static InvocationHandler getInvocationHandler(Object proxy) + { + if (! isProxyClass(proxy.getClass())) + throw new IllegalArgumentException("not a proxy instance"); + return ((Proxy) proxy).h; + } + + /** + * Optional native method to replace (and speed up) the pure Java + * implementation of getProxyClass. Only needed if + * Configuration.HAVE_NATIVE_GET_PROXY_CLASS is true, this does the + * work of both getProxyData0 and generateProxyClass0 with no + * intermediate form in Java. The native code may safely assume that + * this class must be created, and does not already exist. + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @param interfaces the interfaces the class will extend + * @return the generated proxy class + * @throws IllegalArgumentException if the constraints for getProxyClass + * were violated, except for problems with null + * @throws NullPointerException if `interfaces' is null or contains + * a null entry, or if handler is null + * @see Configuration#HAVE_NATIVE_GET_PROXY_CLASS + * @see #getProxyClass(ClassLoader, Class[]) + * @see #getProxyData0(ClassLoader, Class[]) + * @see #generateProxyClass0(ProxyData) + */ + private static native Class getProxyClass0(ClassLoader loader, + Class[] interfaces); + + /** + * Optional native method to replace (and speed up) the pure Java + * implementation of getProxyData. Only needed if + * Configuration.HAVE_NATIVE_GET_PROXY_DATA is true. The native code + * may safely assume that a new ProxyData object must be created which + * does not duplicate any existing ones. + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @param interfaces the interfaces the class will extend + * @return all data that is required to make this proxy class + * @throws IllegalArgumentException if the constraints for getProxyClass + * were violated, except for problems with null + * @throws NullPointerException if `interfaces' is null or contains + * a null entry, or if handler is null + * @see Configuration.HAVE_NATIVE_GET_PROXY_DATA + * @see #getProxyClass(ClassLoader, Class[]) + * @see #getProxyClass0(ClassLoader, Class[]) + * @see ProxyType#getProxyData() + */ + private static native ProxyData getProxyData0(ClassLoader loader, + Class[] interfaces); + + /** + * Optional native method to replace (and speed up) the pure Java + * implementation of generateProxyClass. Only needed if + * Configuration.HAVE_NATIVE_GENERATE_PROXY_CLASS is true. The native + * code may safely assume that a new Class must be created, and that + * the ProxyData object does not describe any existing class. + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @param data the struct of information to convert to a Class. This + * has already been verified for all problems except exceeding + * VM limitations + * @return the newly generated class + * @throws IllegalArgumentException if VM limitations are exceeded + * @see #getProxyClass(ClassLoader, Class[]) + * @see #getProxyClass0(ClassLoader, Class[]) + * @see ProxyData#generateProxyClass(ClassLoader) + */ + private static native Class generateProxyClass0(ClassLoader loader, + ProxyData data); + + /** + * Helper class for mapping unique ClassLoader and interface combinations + * to proxy classes. + * + * @author Eric Blake (ebb9@email.byu.edu) + */ + private static final class ProxyType + { + /** + * Store the class loader (may be null) + */ + final ClassLoader loader; + + /** + * Store the interfaces (never null, all elements are interfaces) + */ + final Class[] interfaces; + + /** + * Construct the helper object. + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @param interfaces an array of interfaces + */ + ProxyType(ClassLoader loader, Class[] interfaces) + { + if (loader == null) + loader = ClassLoader.getSystemClassLoader(); + this.loader = loader; + this.interfaces = interfaces; + } + + /** + * Calculates the hash code. + * + * @return a combination of the classloader and interfaces hashcodes. + */ + public int hashCode() + { + //loader is always not null + int hash = loader.hashCode(); + for (int i = 0; i < interfaces.length; i++) + hash = hash * 31 + interfaces[i].hashCode(); + return hash; + } + + // A more comprehensive comparison of two arrays, + // ignore array element order, and + // ignore redundant elements + private static boolean sameTypes(Class arr1[], Class arr2[]) { + if (arr1.length == 1 && arr2.length == 1) { + return arr1[0] == arr2[0]; + } + + // total occurrance of elements of arr1 in arr2 + int total_occ_of_arr1_in_arr2 = 0; + each_type: + for (int i = arr1.length; --i >= 0; ) + { + Class t = arr1[i]; + for (int j = i; --j >= 0; ) + { + if (t == arr1[j]) + { //found duplicate type + continue each_type; + } + } + + // count c(a unique element of arr1)'s + // occurrences in arr2 + int occ_in_arr2 = 0; + for (int j = arr2.length; --j >= 0; ) + { + if (t == arr2[j]) + { + ++occ_in_arr2; + } + } + if (occ_in_arr2 == 0) + { // t does not occur in arr2 + return false; + } + + total_occ_of_arr1_in_arr2 += occ_in_arr2; + } + // now, each element of arr2 must have been visited + return total_occ_of_arr1_in_arr2 == arr2.length; + } + + /** + * Calculates equality. + * + * @param the object to compare to + * @return true if it is a ProxyType with same data + */ + public boolean equals(Object other) + { + ProxyType pt = (ProxyType) other; + if (loader != pt.loader || interfaces.length != pt.interfaces.length) + return false; + return sameTypes(interfaces, pt.interfaces); + } + } // class ProxyType + + /** + * Helper class which allows hashing of a method name and signature + * without worrying about return type, declaring class, or throws clause, + * and which reduces the maximally common throws clause between two methods + * + * @author Eric Blake (ebb9@email.byu.edu) + */ + private static final class ProxySignature + { + /** + * The core signatures which all Proxy instances handle. + */ + static final HashMap coreMethods = new HashMap(); + static + { + try + { + ProxySignature sig + = new ProxySignature(Object.class + .getMethod("equals", + new Class[] {Object.class})); + coreMethods.put(sig, sig); + sig = new ProxySignature(Object.class.getMethod("hashCode", null)); + coreMethods.put(sig, sig); + sig = new ProxySignature(Object.class.getMethod("toString", null)); + coreMethods.put(sig, sig); + } + catch (Exception e) + { + // assert false; + throw (Error) new InternalError("Unexpected: " + e).initCause(e); + } + } + + /** + * The underlying Method object, never null + */ + final Method method; + + /** + * The set of compatible thrown exceptions, may be empty + */ + final Set exceptions = new HashSet(); + + /** + * Construct a signature + * + * @param method the Method this signature is based on, never null + */ + ProxySignature(Method method) + { + this.method = method; + Class[] exc = method.getExceptionTypes(); + int i = exc.length; + while (--i >= 0) + { + // discard unchecked exceptions + if (Error.class.isAssignableFrom(exc[i]) + || RuntimeException.class.isAssignableFrom(exc[i])) + continue; + exceptions.add(exc[i]); + } + } + + /** + * Given a method, make sure it's return type is identical + * to this, and adjust this signature's throws clause appropriately + * + * @param other the signature to merge in + * @throws IllegalArgumentException if the return types conflict + */ + void checkCompatibility(ProxySignature other) + { + if (method.getReturnType() != other.method.getReturnType()) + throw new IllegalArgumentException("incompatible return types: " + + method + ", " + other.method); + + // if you can think of a more efficient way than this O(n^2) search, + // implement it! + int size1 = exceptions.size(); + int size2 = other.exceptions.size(); + boolean[] valid1 = new boolean[size1]; + boolean[] valid2 = new boolean[size2]; + Iterator itr = exceptions.iterator(); + int pos = size1; + while (--pos >= 0) + { + Class c1 = (Class) itr.next(); + Iterator itr2 = other.exceptions.iterator(); + int pos2 = size2; + while (--pos2 >= 0) + { + Class c2 = (Class) itr2.next(); + if (c2.isAssignableFrom(c1)) + valid1[pos] = true; + if (c1.isAssignableFrom(c2)) + valid2[pos2] = true; + } + } + pos = size1; + itr = exceptions.iterator(); + while (--pos >= 0) + { + itr.next(); + if (! valid1[pos]) + itr.remove(); + } + pos = size2; + itr = other.exceptions.iterator(); + while (--pos >= 0) + { + itr.next(); + if (! valid2[pos]) + itr.remove(); + } + exceptions.addAll(other.exceptions); + } + + /** + * Calculates the hash code. + * + * @return a combination of name and parameter types + */ + public int hashCode() + { + int hash = method.getName().hashCode(); + Class[] types = method.getParameterTypes(); + for (int i = 0; i < types.length; i++) + hash = hash * 31 + types[i].hashCode(); + return hash; + } + + /** + * Calculates equality. + * + * @param the object to compare to + * @return true if it is a ProxySignature with same data + */ + public boolean equals(Object other) + { + ProxySignature ps = (ProxySignature) other; + Class[] types1 = method.getParameterTypes(); + Class[] types2 = ps.method.getParameterTypes(); + if (! method.getName().equals(ps.method.getName()) + || types1.length != types2.length) + return false; + int i = types1.length; + while (--i >= 0) + if (types1[i] != types2[i]) + return false; + return true; + } + } // class ProxySignature + + /** + * A flat representation of all data needed to generate bytecode/instantiate + * a proxy class. This is basically a struct. + * + * @author Eric Blake (ebb9@email.byu.edu) + */ + private static final class ProxyData + { + /** + * The package this class is in <b>including the trailing dot</b> + * or an empty string for the unnamed (aka default) package. + */ + String pack; + + /** + * The interfaces this class implements. Non-null, but possibly empty. + */ + Class[] interfaces; + + /** + * The Method objects this class must pass as the second argument to + * invoke (also useful for determining what methods this class has). + * Non-null, non-empty (includes at least Object.hashCode, Object.equals, + * and Object.toString). + */ + Method[] methods; + + /** + * The exceptions that do not need to be wrapped in + * UndeclaredThrowableException. exceptions[i] is the same as, or a + * subset of subclasses, of methods[i].getExceptionTypes(), depending on + * compatible throws clauses with multiple inheritance. It is unspecified + * if these lists include or exclude subclasses of Error and + * RuntimeException, but excluding them is harmless and generates a + * smaller class. + */ + Class[][] exceptions; + + /** + * For unique id's + */ + private static int count; + + /** + * The id of this proxy class + */ + final int id = count++; + + /** + * Construct a ProxyData with uninitialized data members. + */ + ProxyData() + { + } + + /** + * Return the name of a package (including the trailing dot) + * given the name of a class. + * Returns an empty string if no package. We use this in preference to + * using Class.getPackage() to avoid problems with ClassLoaders + * that don't set the package. + */ + private static String getPackage(Class k) + { + String name = k.getName(); + int idx = name.lastIndexOf('.'); + return name.substring(0, idx + 1); + } + + /** + * Verifies that the arguments are legal, and sets up remaining data + * This should only be called when a class must be generated, as + * it is expensive. + * + * @param pt the ProxyType to convert to ProxyData + * @return the flattened, verified ProxyData structure for use in + * class generation + * @throws IllegalArgumentException if `interfaces' contains + * non-interfaces or incompatible combinations, and verify is true + * @throws NullPointerException if interfaces is null or contains null + */ + static ProxyData getProxyData(ProxyType pt) + { + Map method_set = (Map) ProxySignature.coreMethods.clone(); + boolean in_package = false; // true if we encounter non-public interface + + ProxyData data = new ProxyData(); + data.interfaces = pt.interfaces; + + // if interfaces is too large, we croak later on when the constant + // pool overflows + int i = data.interfaces.length; + while (--i >= 0) + { + Class inter = data.interfaces[i]; + if (! inter.isInterface()) + throw new IllegalArgumentException("not an interface: " + inter); + try + { + if (Class.forName(inter.getName(), false, pt.loader) != inter) + throw new IllegalArgumentException("not accessible in " + + "classloader: " + inter); + } + catch (ClassNotFoundException e) + { + throw new IllegalArgumentException("not accessible in " + + "classloader: " + inter); + } + if (! Modifier.isPublic(inter.getModifiers())) + if (in_package) + { + String p = getPackage(inter); + if (! data.pack.equals(p)) + throw new IllegalArgumentException("non-public interfaces " + + "from different " + + "packages"); + } + else + { + in_package = true; + data.pack = getPackage(inter); + } + for (int j = i-1; j >= 0; j--) + if (data.interfaces[j] == inter) + throw new IllegalArgumentException("duplicate interface: " + + inter); + Method[] methods = inter.getMethods(); + int j = methods.length; + while (--j >= 0) + { + ProxySignature sig = new ProxySignature(methods[j]); + ProxySignature old = (ProxySignature) method_set.put(sig, sig); + if (old != null) + sig.checkCompatibility(old); + } + } + + i = method_set.size(); + data.methods = new Method[i]; + data.exceptions = new Class[i][]; + Iterator itr = method_set.values().iterator(); + while (--i >= 0) + { + ProxySignature sig = (ProxySignature) itr.next(); + data.methods[i] = sig.method; + data.exceptions[i] = (Class[]) sig.exceptions + .toArray(new Class[sig.exceptions.size()]); + } + return data; + } + } // class ProxyData + + /** + * Does all the work of building a class. By making this a nested class, + * this code is not loaded in memory if the VM has a native + * implementation instead. + * + * @author Eric Blake (ebb9@email.byu.edu) + */ + private static final class ClassFactory + { + /** Constants for assisting the compilation */ + private static final byte POOL = 0; + private static final byte FIELD = 1; + private static final byte METHOD = 2; + private static final byte INTERFACE = 3; + private static final String CTOR_SIG + = "(Ljava/lang/reflect/InvocationHandler;)V"; + private static final String INVOKE_SIG = "(Ljava/lang/Object;" + + "Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;"; + + /** Bytecodes for insertion in the class definition byte[] */ + private static final char ACONST_NULL = 1; + private static final char ICONST_0 = 3; + private static final char BIPUSH = 16; + private static final char SIPUSH = 17; + private static final char ILOAD = 21; + private static final char ILOAD_0 = 26; + private static final char ALOAD_0 = 42; + private static final char ALOAD_1 = 43; + private static final char AALOAD = 50; + private static final char AASTORE = 83; + private static final char DUP = 89; + private static final char DUP_X1 = 90; + private static final char SWAP = 95; + private static final char IRETURN = 172; + private static final char LRETURN = 173; + private static final char FRETURN = 174; + private static final char DRETURN = 175; + private static final char ARETURN = 176; + private static final char RETURN = 177; + private static final char GETSTATIC = 178; + private static final char GETFIELD = 180; + private static final char INVOKEVIRTUAL = 182; + private static final char INVOKESPECIAL = 183; + private static final char INVOKESTATIC = 184; + private static final char INVOKEINTERFACE = 185; + private static final char NEW = 187; + private static final char ANEWARRAY = 189; + private static final char ATHROW = 191; + private static final char CHECKCAST = 192; + + // Implementation note: we use StringBuffers to hold the byte data, since + // they automatically grow. However, we only use the low 8 bits of + // every char in the array, so we are using twice the necessary memory + // for the ease StringBuffer provides. + + /** The constant pool. */ + private final StringBuffer pool = new StringBuffer(); + /** The rest of the class data. */ + private final StringBuffer stream = new StringBuffer(); + + /** Map of strings to byte sequences, to minimize size of pool. */ + private final Map poolEntries = new HashMap(); + + /** The VM name of this proxy class. */ + private final String qualName; + + /** + * The Method objects the proxy class refers to when calling the + * invocation handler. + */ + private final Method[] methods; + + /** + * Initializes the buffers with the bytecode contents for a proxy class. + * + * @param data the remainder of the class data + * @throws IllegalArgumentException if anything else goes wrong this + * late in the game; as far as I can tell, this will only happen + * if the constant pool overflows, which is possible even when + * the user doesn't exceed the 65535 interface limit + */ + ClassFactory(ProxyData data) + { + methods = data.methods; + + // magic = 0xcafebabe + // minor_version = 0 + // major_version = 46 + // constant_pool_count: place-holder for now + pool.append("\u00ca\u00fe\u00ba\u00be\0\0\0\56\0\0"); + // constant_pool[], filled in as we go + + // access_flags + putU2(Modifier.SUPER | Modifier.FINAL | Modifier.PUBLIC); + // this_class + qualName = (data.pack + "$Proxy" + data.id); + putU2(classInfo(TypeSignature.getEncodingOfClass(qualName, false))); + // super_class + putU2(classInfo("java/lang/reflect/Proxy")); + + // interfaces_count + putU2(data.interfaces.length); + // interfaces[] + for (int i = 0; i < data.interfaces.length; i++) + putU2(classInfo(data.interfaces[i])); + + // Recall that Proxy classes serialize specially, so we do not need + // to worry about a <clinit> method for this field. Instead, we + // just assign it by reflection after the class is successfully loaded. + // fields_count - private static Method[] m; + putU2(1); + // fields[] + // m.access_flags + putU2(Modifier.PRIVATE | Modifier.STATIC); + // m.name_index + putU2(utf8Info("m")); + // m.descriptor_index + putU2(utf8Info("[Ljava/lang/reflect/Method;")); + // m.attributes_count + putU2(0); + // m.attributes[] + + // methods_count - # handler methods, plus <init> + putU2(methods.length + 1); + // methods[] + // <init>.access_flags + putU2(Modifier.PUBLIC); + // <init>.name_index + putU2(utf8Info("<init>")); + // <init>.descriptor_index + putU2(utf8Info(CTOR_SIG)); + // <init>.attributes_count - only Code is needed + putU2(1); + // <init>.Code.attribute_name_index + putU2(utf8Info("Code")); + // <init>.Code.attribute_length = 18 + // <init>.Code.info: + // $Proxynn(InvocationHandler h) { super(h); } + // <init>.Code.max_stack = 2 + // <init>.Code.max_locals = 2 + // <init>.Code.code_length = 6 + // <init>.Code.code[] + stream.append("\0\0\0\22\0\2\0\2\0\0\0\6" + ALOAD_0 + ALOAD_1 + + INVOKESPECIAL); + putU2(refInfo(METHOD, "java/lang/reflect/Proxy", "<init>", CTOR_SIG)); + // <init>.Code.exception_table_length = 0 + // <init>.Code.exception_table[] + // <init>.Code.attributes_count = 0 + // <init>.Code.attributes[] + stream.append(RETURN + "\0\0\0\0"); + + for (int i = methods.length - 1; i >= 0; i--) + emitMethod(i, data.exceptions[i]); + + // attributes_count + putU2(0); + // attributes[] - empty; omit SourceFile attribute + // XXX should we mark this with a Synthetic attribute? + } + + /** + * Produce the bytecode for a single method. + * + * @param i the index of the method we are building + * @param e the exceptions possible for the method + */ + private void emitMethod(int i, Class[] e) + { + // First, we precalculate the method length and other information. + + Method m = methods[i]; + Class[] paramtypes = m.getParameterTypes(); + int wrap_overhead = 0; // max words taken by wrapped primitive + int param_count = 1; // 1 for this + int code_length = 16; // aload_0, getfield, aload_0, getstatic, const, + // aaload, const/aconst_null, invokeinterface + if (i > 5) + { + if (i > Byte.MAX_VALUE) + code_length += 2; // sipush + else + code_length++; // bipush + } + if (paramtypes.length > 0) + { + code_length += 3; // anewarray + if (paramtypes.length > Byte.MAX_VALUE) + code_length += 2; // sipush + else if (paramtypes.length > 5) + code_length++; // bipush + for (int j = 0; j < paramtypes.length; j++) + { + code_length += 4; // dup, const, load, store + Class type = paramtypes[j]; + if (j > 5) + { + if (j > Byte.MAX_VALUE) + code_length += 2; // sipush + else + code_length++; // bipush + } + if (param_count >= 4) + code_length++; // 2-byte load + param_count++; + if (type.isPrimitive()) + { + code_length += 7; // new, dup, invokespecial + if (type == long.class || type == double.class) + { + wrap_overhead = 3; + param_count++; + } + else if (wrap_overhead < 2) + wrap_overhead = 2; + } + } + } + int end_pc = code_length; + Class ret_type = m.getReturnType(); + if (ret_type == void.class) + code_length++; // return + else if (ret_type.isPrimitive()) + code_length += 7; // cast, invokevirtual, return + else + code_length += 4; // cast, return + int exception_count = 0; + boolean throws_throwable = false; + for (int j = 0; j < e.length; j++) + if (e[j] == Throwable.class) + { + throws_throwable = true; + break; + } + if (! throws_throwable) + { + exception_count = e.length + 3; // Throwable, Error, RuntimeException + code_length += 9; // new, dup_x1, swap, invokespecial, athrow + } + int handler_pc = code_length - 1; + StringBuffer signature = new StringBuffer("("); + for (int j = 0; j < paramtypes.length; j++) + signature.append(TypeSignature.getEncodingOfClass(paramtypes[j])); + signature.append(")").append(TypeSignature.getEncodingOfClass(ret_type)); + + // Now we have enough information to emit the method. + + // handler.access_flags + putU2(Modifier.PUBLIC | Modifier.FINAL); + // handler.name_index + putU2(utf8Info(m.getName())); + // handler.descriptor_index + putU2(utf8Info(signature.toString())); + // handler.attributes_count - Code is necessary, Exceptions possible + putU2(e.length > 0 ? 2 : 1); + + // handler.Code.info: + // type name(args) { + // try { + // return (type) h.invoke(this, methods[i], new Object[] {args}); + // } catch (<declared Exceptions> e) { + // throw e; + // } catch (Throwable t) { + // throw new UndeclaredThrowableException(t); + // } + // } + // Special cases: + // if arg_n is primitive, wrap it + // if method throws Throwable, try-catch is not needed + // if method returns void, return statement not needed + // if method returns primitive, unwrap it + // save space by sharing code for all the declared handlers + + // handler.Code.attribute_name_index + putU2(utf8Info("Code")); + // handler.Code.attribute_length + putU4(12 + code_length + 8 * exception_count); + // handler.Code.max_stack + putU2(param_count == 1 ? 4 : 7 + wrap_overhead); + // handler.Code.max_locals + putU2(param_count); + // handler.Code.code_length + putU4(code_length); + // handler.Code.code[] + putU1(ALOAD_0); + putU1(GETFIELD); + putU2(refInfo(FIELD, "java/lang/reflect/Proxy", "h", + "Ljava/lang/reflect/InvocationHandler;")); + putU1(ALOAD_0); + putU1(GETSTATIC); + putU2(refInfo(FIELD, TypeSignature.getEncodingOfClass(qualName, false), + "m", "[Ljava/lang/reflect/Method;")); + putConst(i); + putU1(AALOAD); + if (paramtypes.length > 0) + { + putConst(paramtypes.length); + putU1(ANEWARRAY); + putU2(classInfo("java/lang/Object")); + param_count = 1; + for (int j = 0; j < paramtypes.length; j++, param_count++) + { + putU1(DUP); + putConst(j); + if (paramtypes[j].isPrimitive()) + { + putU1(NEW); + putU2(classInfo(wrapper(paramtypes[j]))); + putU1(DUP); + } + putLoad(param_count, paramtypes[j]); + if (paramtypes[j].isPrimitive()) + { + putU1(INVOKESPECIAL); + putU2(refInfo(METHOD, wrapper(paramtypes[j]), "<init>", + '(' + (TypeSignature + .getEncodingOfClass(paramtypes[j]) + + ")V"))); + if (paramtypes[j] == long.class + || paramtypes[j] == double.class) + param_count++; + } + putU1(AASTORE); + } + } + else + putU1(ACONST_NULL); + putU1(INVOKEINTERFACE); + putU2(refInfo(INTERFACE, "java/lang/reflect/InvocationHandler", + "invoke", INVOKE_SIG)); + putU1(4); // InvocationHandler, this, Method, Object[] + putU1(0); + if (ret_type == void.class) + putU1(RETURN); + else if (ret_type.isPrimitive()) + { + putU1(CHECKCAST); + putU2(classInfo(wrapper(ret_type))); + putU1(INVOKEVIRTUAL); + putU2(refInfo(METHOD, wrapper(ret_type), + ret_type.getName() + "Value", + "()" + TypeSignature.getEncodingOfClass(ret_type))); + if (ret_type == long.class) + putU1(LRETURN); + else if (ret_type == float.class) + putU1(FRETURN); + else if (ret_type == double.class) + putU1(DRETURN); + else + putU1(IRETURN); + } + else + { + putU1(CHECKCAST); + putU2(classInfo(ret_type)); + putU1(ARETURN); + } + if (! throws_throwable) + { + putU1(NEW); + putU2(classInfo("java/lang/reflect/UndeclaredThrowableException")); + putU1(DUP_X1); + putU1(SWAP); + putU1(INVOKESPECIAL); + putU2(refInfo(METHOD, + "java/lang/reflect/UndeclaredThrowableException", + "<init>", "(Ljava/lang/Throwable;)V")); + putU1(ATHROW); + } + + // handler.Code.exception_table_length + putU2(exception_count); + // handler.Code.exception_table[] + if (! throws_throwable) + { + // handler.Code.exception_table.start_pc + putU2(0); + // handler.Code.exception_table.end_pc + putU2(end_pc); + // handler.Code.exception_table.handler_pc + putU2(handler_pc); + // handler.Code.exception_table.catch_type + putU2(classInfo("java/lang/Error")); + // handler.Code.exception_table.start_pc + putU2(0); + // handler.Code.exception_table.end_pc + putU2(end_pc); + // handler.Code.exception_table.handler_pc + putU2(handler_pc); + // handler.Code.exception_table.catch_type + putU2(classInfo("java/lang/RuntimeException")); + for (int j = 0; j < e.length; j++) + { + // handler.Code.exception_table.start_pc + putU2(0); + // handler.Code.exception_table.end_pc + putU2(end_pc); + // handler.Code.exception_table.handler_pc + putU2(handler_pc); + // handler.Code.exception_table.catch_type + putU2(classInfo(e[j])); + } + // handler.Code.exception_table.start_pc + putU2(0); + // handler.Code.exception_table.end_pc + putU2(end_pc); + // handler.Code.exception_table.handler_pc - + // -8 for undeclared handler, which falls thru to normal one + putU2(handler_pc - 8); + // handler.Code.exception_table.catch_type + putU2(0); + } + // handler.Code.attributes_count + putU2(0); + // handler.Code.attributes[] + + if (e.length > 0) + { + // handler.Exceptions.attribute_name_index + putU2(utf8Info("Exceptions")); + // handler.Exceptions.attribute_length + putU4(2 * e.length + 2); + // handler.Exceptions.number_of_exceptions + putU2(e.length); + // handler.Exceptions.exception_index_table[] + for (int j = 0; j < e.length; j++) + putU2(classInfo(e[j])); + } + } + + /** + * Creates the Class object that corresponds to the bytecode buffers + * built when this object was constructed. + * + * @param loader the class loader to define the proxy class in; null + * implies the bootstrap class loader + * @return the proxy class Class object + */ + Class generate(ClassLoader loader) + { + byte[] bytecode = new byte[pool.length() + stream.length()]; + // More efficient to bypass calling charAt() repetitively. + char[] c = pool.toString().toCharArray(); + int i = c.length; + while (--i >= 0) + bytecode[i] = (byte) c[i]; + c = stream.toString().toCharArray(); + i = c.length; + int j = bytecode.length; + while (i > 0) + bytecode[--j] = (byte) c[--i]; + + // Patch the constant pool size, which we left at 0 earlier. + int count = poolEntries.size() + 1; + bytecode[8] = (byte) (count >> 8); + bytecode[9] = (byte) count; + + try + { + Class vmClassLoader = Class.forName("java.lang.VMClassLoader"); + Class[] types = {ClassLoader.class, String.class, + byte[].class, int.class, int.class, + ProtectionDomain.class }; + Method m = vmClassLoader.getDeclaredMethod("defineClass", types); + // We can bypass the security check of setAccessible(true), since + // we're in the same package. + m.flag = true; + + Object[] args = {loader, qualName, bytecode, new Integer(0), + new Integer(bytecode.length), + Object.class.getProtectionDomain() }; + Class clazz = (Class) m.invoke(null, args); + + // Finally, initialize the m field of the proxy class, before + // returning it. + Field f = clazz.getDeclaredField("m"); + f.flag = true; + // we can share the array, because it is not publicized + f.set(null, methods); + + return clazz; + } + catch (Exception e) + { + // assert false; + throw (Error) new InternalError("Unexpected: " + e).initCause(e); + } + } + + /** + * Put a single byte on the stream. + * + * @param i the information to add (only lowest 8 bits are used) + */ + private void putU1(int i) + { + stream.append((char) i); + } + + /** + * Put two bytes on the stream. + * + * @param i the information to add (only lowest 16 bits are used) + */ + private void putU2(int i) + { + stream.append((char) (i >> 8)).append((char) i); + } + + /** + * Put four bytes on the stream. + * + * @param i the information to add (treated as unsigned) + */ + private void putU4(int i) + { + stream.append((char) (i >> 24)).append((char) (i >> 16)); + stream.append((char) (i >> 8)).append((char) i); + } + + /** + * Put bytecode to load a constant integer on the stream. This only + * needs to work for values less than Short.MAX_VALUE. + * + * @param i the int to add + */ + private void putConst(int i) + { + if (i >= -1 && i <= 5) + putU1(ICONST_0 + i); + else if (i >= Byte.MIN_VALUE && i <= Byte.MAX_VALUE) + { + putU1(BIPUSH); + putU1(i); + } + else + { + putU1(SIPUSH); + putU2(i); + } + } + + /** + * Put bytecode to load a given local variable on the stream. + * + * @param i the slot to load + * @param type the base type of the load + */ + private void putLoad(int i, Class type) + { + int offset = 0; + if (type == long.class) + offset = 1; + else if (type == float.class) + offset = 2; + else if (type == double.class) + offset = 3; + else if (! type.isPrimitive()) + offset = 4; + if (i < 4) + putU1(ILOAD_0 + 4 * offset + i); + else + { + putU1(ILOAD + offset); + putU1(i); + } + } + + /** + * Given a primitive type, return its wrapper class name. + * + * @param clazz the primitive type (but not void.class) + * @return the internal form of the wrapper class name + */ + private String wrapper(Class clazz) + { + if (clazz == boolean.class) + return "java/lang/Boolean"; + if (clazz == byte.class) + return "java/lang/Byte"; + if (clazz == short.class) + return "java/lang/Short"; + if (clazz == char.class) + return "java/lang/Character"; + if (clazz == int.class) + return "java/lang/Integer"; + if (clazz == long.class) + return "java/lang/Long"; + if (clazz == float.class) + return "java/lang/Float"; + if (clazz == double.class) + return "java/lang/Double"; + // assert false; + return null; + } + + /** + * Returns the entry of this String in the Constant pool, adding it + * if necessary. + * + * @param str the String to resolve + * @return the index of the String in the constant pool + */ + private char utf8Info(String str) + { + String utf8 = toUtf8(str); + int len = utf8.length(); + return poolIndex("\1" + (char) (len >> 8) + (char) (len & 0xff) + utf8); + } + + /** + * Returns the entry of the appropriate class info structure in the + * Constant pool, adding it if necessary. + * + * @param name the class name, in internal form + * @return the index of the ClassInfo in the constant pool + */ + private char classInfo(String name) + { + char index = utf8Info(name); + char[] c = {7, (char) (index >> 8), (char) (index & 0xff)}; + return poolIndex(new String(c)); + } + + /** + * Returns the entry of the appropriate class info structure in the + * Constant pool, adding it if necessary. + * + * @param clazz the class type + * @return the index of the ClassInfo in the constant pool + */ + private char classInfo(Class clazz) + { + return classInfo(TypeSignature.getEncodingOfClass(clazz.getName(), + false)); + } + + /** + * Returns the entry of the appropriate fieldref, methodref, or + * interfacemethodref info structure in the Constant pool, adding it + * if necessary. + * + * @param structure FIELD, METHOD, or INTERFACE + * @param clazz the class name, in internal form + * @param name the simple reference name + * @param type the type of the reference + * @return the index of the appropriate Info structure in the constant pool + */ + private char refInfo(byte structure, String clazz, String name, + String type) + { + char cindex = classInfo(clazz); + char ntindex = nameAndTypeInfo(name, type); + // relies on FIELD == 1, METHOD == 2, INTERFACE == 3 + char[] c = {(char) (structure + 8), + (char) (cindex >> 8), (char) (cindex & 0xff), + (char) (ntindex >> 8), (char) (ntindex & 0xff)}; + return poolIndex(new String(c)); + } + + /** + * Returns the entry of the appropriate nameAndTyperef info structure + * in the Constant pool, adding it if necessary. + * + * @param name the simple name + * @param type the reference type + * @return the index of the NameAndTypeInfo structure in the constant pool + */ + private char nameAndTypeInfo(String name, String type) + { + char nindex = utf8Info(name); + char tindex = utf8Info(type); + char[] c = {12, (char) (nindex >> 8), (char) (nindex & 0xff), + (char) (tindex >> 8), (char) (tindex & 0xff)}; + return poolIndex(new String(c)); + } + + /** + * Converts a regular string to a UTF8 string, where the upper byte + * of every char is 0, and '\\u0000' is not in the string. This is + * basically to use a String as a fancy byte[], and while it is less + * efficient in memory use, it is easier for hashing. + * + * @param str the original, in straight unicode + * @return a modified string, in UTF8 format in the low bytes + */ + private String toUtf8(String str) + { + final char[] ca = str.toCharArray(); + final int len = ca.length; + + // Avoid object creation, if str is already fits UTF8. + int i; + for (i = 0; i < len; i++) + if (ca[i] == 0 || ca[i] > '\u007f') + break; + if (i == len) + return str; + + final StringBuffer sb = new StringBuffer(str); + sb.setLength(i); + for ( ; i < len; i++) + { + final char c = ca[i]; + if (c > 0 && c <= '\u007f') + sb.append(c); + else if (c <= '\u07ff') // includes '\0' + { + sb.append((char) (0xc0 | (c >> 6))); + sb.append((char) (0x80 | (c & 0x6f))); + } + else + { + sb.append((char) (0xe0 | (c >> 12))); + sb.append((char) (0x80 | ((c >> 6) & 0x6f))); + sb.append((char) (0x80 | (c & 0x6f))); + } + } + return sb.toString(); + } + + /** + * Returns the location of a byte sequence (conveniently wrapped in + * a String with all characters between \u0001 and \u00ff inclusive) + * in the constant pool, adding it if necessary. + * + * @param sequence the byte sequence to look for + * @return the index of the sequence + * @throws IllegalArgumentException if this would make the constant + * pool overflow + */ + private char poolIndex(String sequence) + { + Integer i = (Integer) poolEntries.get(sequence); + if (i == null) + { + // pool starts at index 1 + int size = poolEntries.size() + 1; + if (size >= 65535) + throw new IllegalArgumentException("exceeds VM limitations"); + i = new Integer(size); + poolEntries.put(sequence, i); + pool.append(sequence); + } + return (char) i.intValue(); + } + } // class ClassFactory +} diff --git a/libjava/classpath/java/lang/reflect/README b/libjava/classpath/java/lang/reflect/README new file mode 100644 index 00000000000..99ea224d7f6 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/README @@ -0,0 +1,4 @@ +README for java.lang.reflect: + +java.lang.reflect is now mostly empty. We've carved out the classes that have +to do with the VM and put them into the VM interface. diff --git a/libjava/classpath/java/lang/reflect/ReflectPermission.java b/libjava/classpath/java/lang/reflect/ReflectPermission.java new file mode 100644 index 00000000000..56eccf8130c --- /dev/null +++ b/libjava/classpath/java/lang/reflect/ReflectPermission.java @@ -0,0 +1,102 @@ +/* ReflectPermission.java - named permission for reflaction + Copyright (C) 2000, 2001, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.lang.reflect; + +import java.security.BasicPermission; + +/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3 + * "The Java Language Specification", ISBN 0-201-63451-1 + * plus online API docs for JDK 1.2 beta from http://www.javasoft.com. + */ + +/** + * This class implements permissions for reflection. This is a named + * permission, and the only defined name is suppressAccessChecks, which + * allows suppression of normal Java objects when using reflection. + * + * <table> + * <tr> + * <th>Permission Target Name</th> + * <th>What Permission Allows</th> + * <th>Risk of Allowing Permission</th> + * </tr> + * <tr> + * <td><code>suppressAccessChecks</code></td> + * <td>Ability to access fields, invoke methods, and construct objects + * via reflection, including non-public members in contexts where + * such access is not legal at compile-time.</td> + * <td>This is dangerous. It exposes possibly confidential information, + * and malicious code could interfere with the internals of the Virtual + * Machine by corrupting private data.</td> + * </tr> + * </table> + * + * @author Tom Tromey (tromey@redhat.com) + * @author Eric Blake (ebb9@email.byu.edu) + * @since 1.2 + * @status updated to 1.4 + */ +public final class ReflectPermission + extends BasicPermission +{ + /** + * Compatible with JDK 1.2. + */ + private static final long serialVersionUID = 7412737110241507485L; + + /** + * Construct a ReflectPermission with the given name. + * + * @param name The permission name + */ + public ReflectPermission(String name) + { + super(name); + } + + /** + * Construct a ReflectPermission with the given name. + * + * @param name The permission name + * @param actions The actions; this is ignored and should be null + */ + public ReflectPermission(String name, String actions) + { + super(name, actions); + } +} diff --git a/libjava/classpath/java/lang/reflect/TODO b/libjava/classpath/java/lang/reflect/TODO new file mode 100755 index 00000000000..6514c760317 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/TODO @@ -0,0 +1,4 @@ +TODO for java.lang.reflect Java side + +- more tests! +- Java 2 support (waiting on java.lang Java 2 support) diff --git a/libjava/classpath/java/lang/reflect/Type.java b/libjava/classpath/java/lang/reflect/Type.java new file mode 100644 index 00000000000..c9ea5bfb9cb --- /dev/null +++ b/libjava/classpath/java/lang/reflect/Type.java @@ -0,0 +1,55 @@ +/* Type.java - Superinterface for all types. + Copyright (C) 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Represents any <code>Type</code> within the Java programming + * language. This may be a primitive type (e.g. <code>int</code>, + * an array type (e.g. <code>double[]>/code>), a raw type + * (e.g. <code>Calendar</code>), a parameterized type + * (e.g. <code>List<Boolean></code>, or a type + * variable (e.g. <code>T extends String</code>). + * + * @author Tom Tromey (tromey@redhat.com) + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + */ +public interface Type +{ +} diff --git a/libjava/classpath/java/lang/reflect/UndeclaredThrowableException.java b/libjava/classpath/java/lang/reflect/UndeclaredThrowableException.java new file mode 100644 index 00000000000..6d5a8008459 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/UndeclaredThrowableException.java @@ -0,0 +1,128 @@ +/* UndeclaredThrowableException.java -- wraps an undeclared checked exception + thrown by a Proxy invocation handler + Copyright (C) 2001, 2002, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * This exception class is thrown by a {@link Proxy} instance if + * the {@link InvocationHandler#invoke(Object, Method, Object[]) invoke} + * method of that instance's InvocationHandler attempts to throw an + * exception that not declared by the throws clauses of all of the + * interface methods that the proxy instance is implementing. + * + * <p>When thrown by Proxy, this class will always wrap a checked + * exception, never {@link Error} or {@link RuntimeException}, + * which are unchecked. + * + * @author Eric Blake (ebb9@email.byu.edu) + * @see Proxy + * @see InvocationHandler + * @since 1.3 + * @status updated to 1.4 + */ +public class UndeclaredThrowableException extends RuntimeException +{ + /** + * Compatible with JDK 1.3+. + */ + private static final long serialVersionUID = 330127114055056639L; + + /** + * The immutable exception that this wraps. This field is redundant + * with {@link Throwable#cause}, but is necessary for serial compatibility. + * + * @serial the chained exception + */ + private final Throwable undeclaredThrowable; + + /** + * Wraps the given checked exception into a RuntimeException, with no + * detail message. {@link Throwable#initCause(Throwable)} will fail + * on this instance. + * + * @param cause the undeclared throwable that caused this exception, + * may be null + */ + public UndeclaredThrowableException(Throwable cause) + { + this(cause, null); + } + + /** + * Wraps the given checked exception into a RuntimeException, with the + * specified detail message. {@link Throwable#initCause(Throwable)} will + * fail on this instance. + * + * @param cause the undeclared throwable that caused this exception, + * may be null + * @param message the message, may be null + */ + public UndeclaredThrowableException(Throwable cause, String message) + { + super(message, cause); + undeclaredThrowable = cause; + } + + /** + * Returns the cause of this exception. If this exception was created + * by a {@link Proxy} instance, it will be a non-null checked + * exception. This method pre-dates exception chaining, and is now + * simply a longer way to call <code>getCause()</code>. + * + * @return the cause of this exception, may be null + * @see #getCause() + */ + public Throwable getUndeclaredThrowable() + { + return undeclaredThrowable; + } + + /** + * Returns the cause of this exception. If this exception was created + * by a {@link Proxy} instance, it will be a non-null checked + * exception. + * + * @return the cause of this exception, may be null + * @since 1.4 + */ + public Throwable getCause() + { + return undeclaredThrowable; + } +} diff --git a/libjava/classpath/java/lang/reflect/WildcardType.java b/libjava/classpath/java/lang/reflect/WildcardType.java new file mode 100644 index 00000000000..4f789067cf0 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/WildcardType.java @@ -0,0 +1,115 @@ +/* WildcardType.java -- A wildcard type expression e.g. ? extends String + Copyright (C) 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Represents a wildcard type expression, where the type variable + * is unnamed. The simplest example of this is <code>?</code>, + * which represents any unbounded type. Another example is + * <code>? extends Number</code>, which specifies any type + * which is a subclass of <code>Number</code> (<code>Number</code> + * is the upper bound). + * </p> + * <p> + * <code>? super String</code> gives the type a less common lower bound, + * which means that the type must be either a <code>String</code> or one + * of its superclasses. This can be useful in working with collections. + * You may want a method to add instances of a class to a collection + * with a more generic type (e.g. adding <code>String</code>s to + * a list of <code>Object</code>s), but don't want to allow users + * to pass in a collection with a more specific type. + * </p> + * + * @author Tom Tromey (tromey@redhat.com) + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + */ +public interface WildcardType extends Type +{ + + /** + * <p> + * Returns an array of <code>Type</code>s, which specify the + * lower bounds of this type. The default lower bound is + * <code>null</code>, which causes this method to return an + * empty array. + * </p> + * <p> + * In generating the array of <code>Type</code>s, each + * <code>ParameterizedType</code> or <code>TypeVariable</code> is + * created, (see the documentation for these classes for details of this + * process), if necessary, while all other types are simply + * resolved. + * </p> + * + * @return an array of <code>Type</code> objects, representing + * the wildcard type's lower bounds. + * @throws TypeNotPresentException if any of the types referred to by + * the lower bounds of this type do not actually exist. + * @throws MalformedParameterizedTypeException if any of the types + * refer to a type which can not be instantiated. + */ + Type[] getLowerBounds(); + + /** + * <p> + * Returns an array of <code>Type</code>s, which specify the + * upper bounds of this type. The default upper bound is + * <code>Object</code>, which causes this method to return an + * array, containing just the <code>Type</code> instance for + * <code>Object</code>. + * </p> + * <p> + * In generating the array of <code>Type</code>s, each + * <code>ParameterizedType</code> or <code>TypeVariable</code> is + * created, (see the documentation for these classes for details of this + * process), if necessary, while all other types are simply + * resolved. + * </p> + * + * @return an array of <code>Type</code> objects, representing + * the wildcard type's upper bounds. + * @throws TypeNotPresentException if any of the types referred to by + * the upper bounds of this type do not actually exist. + * @throws MalformedParameterizedTypeException if any of the types + * refer to a type which can not be instantiated. + */ + Type[] getUpperBounds(); + +} diff --git a/libjava/classpath/java/lang/reflect/package.html b/libjava/classpath/java/lang/reflect/package.html new file mode 100644 index 00000000000..9f7ed632836 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/package.html @@ -0,0 +1,47 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> +<!-- package.html - describes classes in java.lang.reflect package. + Copyright (C) 2002 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. --> + +<html> +<head><title>GNU Classpath - java.lang.reflect</title></head> + +<body> +<p>Runtime inspection and manipulation of object classes, methods, arguments +and fields.</p> + +</body> +</html> |