summaryrefslogtreecommitdiff
path: root/libjava/classpath/java/lang/Class.java
diff options
context:
space:
mode:
authortromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2005-07-16 00:30:23 +0000
committertromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2005-07-16 00:30:23 +0000
commitc8875fb97fc03779a5bba09872227b1d08e5d52a (patch)
treea0b991cf5866ae1d616639b906ac001811d74508 /libjava/classpath/java/lang/Class.java
parentc40c1730800ed292b6db39a83d592476fa59623c (diff)
downloadgcc-c8875fb97fc03779a5bba09872227b1d08e5d52a.tar.gz
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102074 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libjava/classpath/java/lang/Class.java')
-rw-r--r--libjava/classpath/java/lang/Class.java1324
1 files changed, 1324 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/Class.java b/libjava/classpath/java/lang/Class.java
new file mode 100644
index 00000000000..6b8bc93ae63
--- /dev/null
+++ b/libjava/classpath/java/lang/Class.java
@@ -0,0 +1,1324 @@
+/* Class.java -- Representation of a Java class.
+ Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004, 2005
+ Free Software Foundation
+
+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;
+
+import gnu.classpath.VMStackWalker;
+
+import java.io.InputStream;
+import java.io.Serializable;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Member;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.net.URL;
+import java.security.AccessController;
+import java.security.AllPermission;
+import java.security.Permissions;
+import java.security.PrivilegedAction;
+import java.security.ProtectionDomain;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+
+
+/**
+ * A Class represents a Java type. There will never be multiple Class
+ * objects with identical names and ClassLoaders. Primitive types, array
+ * types, and void also have a Class object.
+ *
+ * <p>Arrays with identical type and number of dimensions share the same class.
+ * The array class ClassLoader is the same as the ClassLoader of the element
+ * type of the array (which can be null to indicate the bootstrap classloader).
+ * The name of an array class is <code>[&lt;signature format&gt;;</code>.
+ * <p> For example,
+ * String[]'s class is <code>[Ljava.lang.String;</code>. boolean, byte,
+ * short, char, int, long, float and double have the "type name" of
+ * Z,B,S,C,I,J,F,D for the purposes of array classes. If it's a
+ * multidimensioned array, the same principle applies:
+ * <code>int[][][]</code> == <code>[[[I</code>.
+ *
+ * <p>There is no public constructor - Class objects are obtained only through
+ * the virtual machine, as defined in ClassLoaders.
+ *
+ * @serialData Class objects serialize specially:
+ * <code>TC_CLASS ClassDescriptor</code>. For more serialization information,
+ * see {@link ObjectStreamClass}.
+ *
+ * @author John Keiser
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @author Tom Tromey (tromey@cygnus.com)
+ * @since 1.0
+ * @see ClassLoader
+ */
+public final class Class implements Serializable
+{
+ /**
+ * Compatible with JDK 1.0+.
+ */
+ private static final long serialVersionUID = 3206093459760846163L;
+
+ /** The class signers. */
+ private Object[] signers = null;
+ /** The class protection domain. */
+ private final ProtectionDomain pd;
+
+ /* We use an inner class, so that Class doesn't have a static initializer */
+ private static final class StaticData
+ {
+ static final ProtectionDomain unknownProtectionDomain;
+
+ static
+ {
+ Permissions permissions = new Permissions();
+ permissions.add(new AllPermission());
+ unknownProtectionDomain = new ProtectionDomain(null, permissions);
+ }
+ }
+
+ final transient Object vmdata;
+
+ /** newInstance() caches the default constructor */
+ private transient Constructor constructor;
+
+ /**
+ * Class is non-instantiable from Java code; only the VM can create
+ * instances of this class.
+ */
+ Class(Object vmdata)
+ {
+ this(vmdata, null);
+ }
+
+ Class(Object vmdata, ProtectionDomain pd)
+ {
+ this.vmdata = vmdata;
+ // If the VM didn't supply a protection domain and the class is an array,
+ // we "inherit" the protection domain from the component type class. This
+ // saves the VM from having to worry about protection domains for array
+ // classes.
+ if (pd == null && isArray())
+ this.pd = getComponentType().pd;
+ else
+ this.pd = pd;
+ }
+
+ /**
+ * Use the classloader of the current class to load, link, and initialize
+ * a class. This is equivalent to your code calling
+ * <code>Class.forName(name, true, getClass().getClassLoader())</code>.
+ *
+ * @param name the name of the class to find
+ * @return the Class object representing the class
+ * @throws ClassNotFoundException if the class was not found by the
+ * classloader
+ * @throws LinkageError if linking the class fails
+ * @throws ExceptionInInitializerError if the class loads, but an exception
+ * occurs during initialization
+ */
+ public static Class forName(String name) throws ClassNotFoundException
+ {
+ Class result = VMClass.forName (name);
+ if (result == null)
+ result = Class.forName(name, true,
+ VMStackWalker.getCallingClassLoader());
+ return result;
+ }
+
+ /**
+ * Use the specified classloader to load and link a class. If the loader
+ * is null, this uses the bootstrap class loader (provide the security
+ * check succeeds). Unfortunately, this method cannot be used to obtain
+ * the Class objects for primitive types or for void, you have to use
+ * the fields in the appropriate java.lang wrapper classes.
+ *
+ * <p>Calls <code>classloader.loadclass(name, initialize)</code>.
+ *
+ * @param name the name of the class to find
+ * @param initialize whether or not to initialize the class at this time
+ * @param classloader the classloader to use to find the class; null means
+ * to use the bootstrap class loader
+ *
+ * @return the class object for the given class
+ *
+ * @throws ClassNotFoundException if the class was not found by the
+ * classloader
+ * @throws LinkageError if linking the class fails
+ * @throws ExceptionInInitializerError if the class loads, but an exception
+ * occurs during initialization
+ * @throws SecurityException if the <code>classloader</code> argument
+ * is <code>null</code> and the caller does not have the
+ * <code>RuntimePermission("getClassLoader")</code> permission
+ * @see ClassLoader
+ * @since 1.2
+ */
+ public static Class forName(String name, boolean initialize,
+ ClassLoader classloader)
+ throws ClassNotFoundException
+ {
+ if (classloader == null)
+ {
+ // Check if we may access the bootstrap classloader
+ SecurityManager sm = SecurityManager.current;
+ if (sm != null)
+ {
+ // Get the calling classloader
+ ClassLoader cl = VMStackWalker.getCallingClassLoader();
+ if (cl != null)
+ sm.checkPermission(new RuntimePermission("getClassLoader"));
+ }
+ if (name.startsWith("["))
+ return VMClass.loadArrayClass(name, null);
+ Class c = VMClassLoader.loadClass(name, true);
+ if (c != null)
+ {
+ if (initialize)
+ VMClass.initialize(c);
+ return c;
+ }
+ throw new ClassNotFoundException(name);
+ }
+ if (name.startsWith("["))
+ return VMClass.loadArrayClass(name, classloader);
+ Class c = classloader.loadClass(name);
+ classloader.resolveClass(c);
+ if (initialize)
+ VMClass.initialize(c);
+ return c;
+ }
+
+ /**
+ * Get all the public member classes and interfaces declared in this
+ * class or inherited from superclasses. This returns an array of length
+ * 0 if there are no member classes, including for primitive types. A
+ * security check may be performed, with
+ * <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all public member classes in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Class[] getClasses()
+ {
+ memberAccessCheck(Member.PUBLIC);
+ return internalGetClasses();
+ }
+
+ /**
+ * Like <code>getClasses()</code> but without the security checks.
+ */
+ private Class[] internalGetClasses()
+ {
+ ArrayList list = new ArrayList();
+ list.addAll(Arrays.asList(getDeclaredClasses(true)));
+ Class superClass = getSuperclass();
+ if (superClass != null)
+ list.addAll(Arrays.asList(superClass.internalGetClasses()));
+ return (Class[])list.toArray(new Class[list.size()]);
+ }
+
+ /**
+ * Get the ClassLoader that loaded this class. If the class was loaded
+ * by the bootstrap classloader, this method will return null.
+ * If there is a security manager, and the caller's class loader is not
+ * an ancestor of the requested one, a security check of
+ * <code>RuntimePermission("getClassLoader")</code>
+ * must first succeed. Primitive types and void return null.
+ *
+ * @return the ClassLoader that loaded this class
+ * @throws SecurityException if the security check fails
+ * @see ClassLoader
+ * @see RuntimePermission
+ */
+ public ClassLoader getClassLoader()
+ {
+ if (isPrimitive())
+ return null;
+
+ ClassLoader loader = VMClass.getClassLoader(this);
+ // Check if we may get the classloader
+ SecurityManager sm = SecurityManager.current;
+ if (sm != null)
+ {
+ // Get the calling classloader
+ ClassLoader cl = VMStackWalker.getCallingClassLoader();
+ if (cl != null && !cl.isAncestorOf(loader))
+ sm.checkPermission(new RuntimePermission("getClassLoader"));
+ }
+ return loader;
+ }
+
+ /**
+ * If this is an array, get the Class representing the type of array.
+ * Examples: "[[Ljava.lang.String;" would return "[Ljava.lang.String;", and
+ * calling getComponentType on that would give "java.lang.String". If
+ * this is not an array, returns null.
+ *
+ * @return the array type of this class, or null
+ * @see Array
+ * @since 1.1
+ */
+ public Class getComponentType()
+ {
+ return VMClass.getComponentType (this);
+ }
+
+ /**
+ * Get a public constructor declared in this class. If the constructor takes
+ * no argument, an array of zero elements and null are equivalent for the
+ * types argument. A security check may be performed, with
+ * <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @param types the type of each parameter
+ * @return the constructor
+ * @throws NoSuchMethodException if the constructor does not exist
+ * @throws SecurityException if the security check fails
+ * @see #getConstructors()
+ * @since 1.1
+ */
+ public Constructor getConstructor(Class[] types) throws NoSuchMethodException
+ {
+ memberAccessCheck(Member.PUBLIC);
+ Constructor[] constructors = getDeclaredConstructors(true);
+ for (int i = 0; i < constructors.length; i++)
+ {
+ Constructor constructor = constructors[i];
+ if (matchParameters(types, constructor.getParameterTypes()))
+ return constructor;
+ }
+ throw new NoSuchMethodException();
+ }
+
+ /**
+ * Get all the public constructors of this class. This returns an array of
+ * length 0 if there are no constructors, including for primitive types,
+ * arrays, and interfaces. It does, however, include the default
+ * constructor if one was supplied by the compiler. A security check may
+ * be performed, with <code>checkMemberAccess(this, Member.PUBLIC)</code>
+ * as well as <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all public constructors in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Constructor[] getConstructors()
+ {
+ memberAccessCheck(Member.PUBLIC);
+ return getDeclaredConstructors(true);
+ }
+
+ /**
+ * Get a constructor declared in this class. If the constructor takes no
+ * argument, an array of zero elements and null are equivalent for the
+ * types argument. A security check may be performed, with
+ * <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @param types the type of each parameter
+ * @return the constructor
+ * @throws NoSuchMethodException if the constructor does not exist
+ * @throws SecurityException if the security check fails
+ * @see #getDeclaredConstructors()
+ * @since 1.1
+ */
+ public Constructor getDeclaredConstructor(Class[] types)
+ throws NoSuchMethodException
+ {
+ memberAccessCheck(Member.DECLARED);
+ Constructor[] constructors = getDeclaredConstructors(false);
+ for (int i = 0; i < constructors.length; i++)
+ {
+ Constructor constructor = constructors[i];
+ if (matchParameters(types, constructor.getParameterTypes()))
+ return constructor;
+ }
+ throw new NoSuchMethodException();
+ }
+
+ /**
+ * Get all the declared member classes and interfaces in this class, but
+ * not those inherited from superclasses. This returns an array of length
+ * 0 if there are no member classes, including for primitive types. A
+ * security check may be performed, with
+ * <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all declared member classes in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Class[] getDeclaredClasses()
+ {
+ memberAccessCheck(Member.DECLARED);
+ return getDeclaredClasses(false);
+ }
+
+ Class[] getDeclaredClasses (boolean publicOnly)
+ {
+ return VMClass.getDeclaredClasses (this, publicOnly);
+ }
+
+ /**
+ * Get all the declared constructors of this class. This returns an array of
+ * length 0 if there are no constructors, including for primitive types,
+ * arrays, and interfaces. It does, however, include the default
+ * constructor if one was supplied by the compiler. A security check may
+ * be performed, with <code>checkMemberAccess(this, Member.DECLARED)</code>
+ * as well as <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all constructors in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Constructor[] getDeclaredConstructors()
+ {
+ memberAccessCheck(Member.DECLARED);
+ return getDeclaredConstructors(false);
+ }
+
+ Constructor[] getDeclaredConstructors (boolean publicOnly)
+ {
+ return VMClass.getDeclaredConstructors (this, publicOnly);
+ }
+
+ /**
+ * Get a field declared in this class, where name is its simple name. The
+ * implicit length field of arrays is not available. A security check may
+ * be performed, with <code>checkMemberAccess(this, Member.DECLARED)</code>
+ * as well as <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @param name the name of the field
+ * @return the field
+ * @throws NoSuchFieldException if the field does not exist
+ * @throws SecurityException if the security check fails
+ * @see #getDeclaredFields()
+ * @since 1.1
+ */
+ public Field getDeclaredField(String name) throws NoSuchFieldException
+ {
+ memberAccessCheck(Member.DECLARED);
+ Field[] fields = getDeclaredFields(false);
+ for (int i = 0; i < fields.length; i++)
+ {
+ if (fields[i].getName().equals(name))
+ return fields[i];
+ }
+ throw new NoSuchFieldException();
+ }
+
+ /**
+ * Get all the declared fields in this class, but not those inherited from
+ * superclasses. This returns an array of length 0 if there are no fields,
+ * including for primitive types. This does not return the implicit length
+ * field of arrays. A security check may be performed, with
+ * <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all declared fields in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Field[] getDeclaredFields()
+ {
+ memberAccessCheck(Member.DECLARED);
+ return getDeclaredFields(false);
+ }
+
+ Field[] getDeclaredFields (boolean publicOnly)
+ {
+ return VMClass.getDeclaredFields (this, publicOnly);
+ }
+
+ /**
+ * Get a method declared in this class, where name is its simple name. The
+ * implicit methods of Object are not available from arrays or interfaces.
+ * Constructors (named "&lt;init&gt;" in the class file) and class initializers
+ * (name "&lt;clinit&gt;") are not available. The Virtual Machine allows
+ * multiple methods with the same signature but differing return types; in
+ * such a case the most specific return types are favored, then the final
+ * choice is arbitrary. If the method takes no argument, an array of zero
+ * elements and null are equivalent for the types argument. A security
+ * check may be performed, with
+ * <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @param methodName the name of the method
+ * @param types the type of each parameter
+ * @return the method
+ * @throws NoSuchMethodException if the method does not exist
+ * @throws SecurityException if the security check fails
+ * @see #getDeclaredMethods()
+ * @since 1.1
+ */
+ public Method getDeclaredMethod(String methodName, Class[] types)
+ throws NoSuchMethodException
+ {
+ memberAccessCheck(Member.DECLARED);
+ Method match = matchMethod(getDeclaredMethods(false), methodName, types);
+ if (match == null)
+ throw new NoSuchMethodException(methodName);
+ return match;
+ }
+
+ /**
+ * Get all the declared methods in this class, but not those inherited from
+ * superclasses. This returns an array of length 0 if there are no methods,
+ * including for primitive types. This does include the implicit methods of
+ * arrays and interfaces which mirror methods of Object, nor does it
+ * include constructors or the class initialization methods. The Virtual
+ * Machine allows multiple methods with the same signature but differing
+ * return types; all such methods are in the returned array. A security
+ * check may be performed, with
+ * <code>checkMemberAccess(this, Member.DECLARED)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all declared methods in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Method[] getDeclaredMethods()
+ {
+ memberAccessCheck(Member.DECLARED);
+ return getDeclaredMethods(false);
+ }
+
+ Method[] getDeclaredMethods (boolean publicOnly)
+ {
+ return VMClass.getDeclaredMethods (this, publicOnly);
+ }
+
+ /**
+ * If this is a nested or inner class, return the class that declared it.
+ * If not, return null.
+ *
+ * @return the declaring class of this class
+ * @since 1.1
+ */
+ public Class getDeclaringClass()
+ {
+ return VMClass.getDeclaringClass (this);
+ }
+
+ /**
+ * Get a public field declared or inherited in this class, where name is
+ * its simple name. If the class contains multiple accessible fields by
+ * that name, an arbitrary one is returned. The implicit length field of
+ * arrays is not available. A security check may be performed, with
+ * <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @param fieldName the name of the field
+ * @return the field
+ * @throws NoSuchFieldException if the field does not exist
+ * @throws SecurityException if the security check fails
+ * @see #getFields()
+ * @since 1.1
+ */
+ public Field getField(String fieldName)
+ throws NoSuchFieldException
+ {
+ memberAccessCheck(Member.PUBLIC);
+ Field field = internalGetField(fieldName);
+ if (field == null)
+ throw new NoSuchFieldException(fieldName);
+ return field;
+ }
+
+ /**
+ * Get all the public fields declared in this class or inherited from
+ * superclasses. This returns an array of length 0 if there are no fields,
+ * including for primitive types. This does not return the implicit length
+ * field of arrays. A security check may be performed, with
+ * <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all public fields in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Field[] getFields()
+ {
+ memberAccessCheck(Member.PUBLIC);
+ return internalGetFields();
+ }
+
+ /**
+ * Like <code>getFields()</code> but without the security checks.
+ */
+ private Field[] internalGetFields()
+ {
+ HashSet set = new HashSet();
+ set.addAll(Arrays.asList(getDeclaredFields(true)));
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++)
+ set.addAll(Arrays.asList(interfaces[i].internalGetFields()));
+ Class superClass = getSuperclass();
+ if (superClass != null)
+ set.addAll(Arrays.asList(superClass.internalGetFields()));
+ return (Field[])set.toArray(new Field[set.size()]);
+ }
+
+ /**
+ * Returns the <code>Package</code> in which this class is defined
+ * Returns null when this information is not available from the
+ * classloader of this class or when the classloader of this class
+ * is null.
+ *
+ * @return the package for this class, if it is available
+ * @since 1.2
+ */
+ public Package getPackage()
+ {
+ ClassLoader cl = getClassLoader();
+ if (cl != null)
+ return cl.getPackage(getPackagePortion(getName()));
+ return null;
+ }
+
+ /**
+ * Get the interfaces this class <em>directly</em> implements, in the
+ * order that they were declared. This returns an empty array, not null,
+ * for Object, primitives, void, and classes or interfaces with no direct
+ * superinterface. Array types return Cloneable and Serializable.
+ *
+ * @return the interfaces this class directly implements
+ */
+ public Class[] getInterfaces()
+ {
+ return VMClass.getInterfaces (this);
+ }
+
+ private static final class MethodKey
+ {
+ private String name;
+ private Class[] params;
+ private Class returnType;
+ private int hash;
+
+ MethodKey(Method m)
+ {
+ name = m.getName();
+ params = m.getParameterTypes();
+ returnType = m.getReturnType();
+ hash = name.hashCode() ^ returnType.hashCode();
+ for(int i = 0; i < params.length; i++)
+ {
+ hash ^= params[i].hashCode();
+ }
+ }
+
+ public boolean equals(Object o)
+ {
+ if(o instanceof MethodKey)
+ {
+ MethodKey m = (MethodKey)o;
+ if(m.name.equals(name) && m.params.length == params.length && m.returnType == returnType)
+ {
+ for(int i = 0; i < params.length; i++)
+ {
+ if(m.params[i] != params[i])
+ {
+ return false;
+ }
+ }
+ return true;
+ }
+ }
+ return false;
+ }
+
+ public int hashCode()
+ {
+ return hash;
+ }
+ }
+
+ /**
+ * Get a public method declared or inherited in this class, where name is
+ * its simple name. The implicit methods of Object are not available from
+ * interfaces. Constructors (named "&lt;init&gt;" in the class file) and class
+ * initializers (name "&lt;clinit&gt;") are not available. The Virtual
+ * Machine allows multiple methods with the same signature but differing
+ * return types, and the class can inherit multiple methods of the same
+ * return type; in such a case the most specific return types are favored,
+ * then the final choice is arbitrary. If the method takes no argument, an
+ * array of zero elements and null are equivalent for the types argument.
+ * A security check may be performed, with
+ * <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @param methodName the name of the method
+ * @param types the type of each parameter
+ * @return the method
+ * @throws NoSuchMethodException if the method does not exist
+ * @throws SecurityException if the security check fails
+ * @see #getMethods()
+ * @since 1.1
+ */
+ public Method getMethod(String methodName, Class[] types)
+ throws NoSuchMethodException
+ {
+ memberAccessCheck(Member.PUBLIC);
+ Method method = internalGetMethod(methodName, types);
+ if (method == null)
+ throw new NoSuchMethodException(methodName);
+ return method;
+ }
+
+ /**
+ * Like <code>getMethod(String,Class[])</code> but without the security
+ * checks and returns null instead of throwing NoSuchMethodException.
+ */
+ private Method internalGetMethod(String methodName, Class[] args)
+ {
+ Method match = matchMethod(getDeclaredMethods(true), methodName, args);
+ if (match != null)
+ return match;
+ Class superClass = getSuperclass();
+ if (superClass != null)
+ {
+ match = superClass.internalGetMethod(methodName, args);
+ if(match != null)
+ return match;
+ }
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++)
+ {
+ match = interfaces[i].internalGetMethod(methodName, args);
+ if (match != null)
+ return match;
+ }
+ return null;
+ }
+
+ /**
+ * Find the best matching method in <code>list</code> according to
+ * the definition of ``best matching'' used by <code>getMethod()</code>
+ *
+ * <p>
+ * Returns the method if any, otherwise <code>null</code>.
+ *
+ * @param list List of methods to search
+ * @param name Name of method
+ * @param args Method parameter types
+ * @see #getMethod()
+ */
+ private static Method matchMethod(Method[] list, String name, Class[] args)
+ {
+ Method match = null;
+ for (int i = 0; i < list.length; i++)
+ {
+ Method method = list[i];
+ if (!method.getName().equals(name))
+ continue;
+ if (!matchParameters(args, method.getParameterTypes()))
+ continue;
+ if (match == null
+ || match.getReturnType().isAssignableFrom(method.getReturnType()))
+ match = method;
+ }
+ return match;
+ }
+
+ /**
+ * Check for an exact match between parameter type lists.
+ * Either list may be <code>null</code> to mean a list of
+ * length zero.
+ */
+ private static boolean matchParameters(Class[] types1, Class[] types2)
+ {
+ if (types1 == null)
+ return types2 == null || types2.length == 0;
+ if (types2 == null)
+ return types1 == null || types1.length == 0;
+ if (types1.length != types2.length)
+ return false;
+ for (int i = 0; i < types1.length; i++)
+ {
+ if (types1[i] != types2[i])
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Get all the public methods declared in this class or inherited from
+ * superclasses. This returns an array of length 0 if there are no methods,
+ * including for primitive types. This does not include the implicit
+ * methods of interfaces which mirror methods of Object, nor does it
+ * include constructors or the class initialization methods. The Virtual
+ * Machine allows multiple methods with the same signature but differing
+ * return types; all such methods are in the returned array. A security
+ * check may be performed, with
+ * <code>checkMemberAccess(this, Member.PUBLIC)</code> as well as
+ * <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return all public methods in this class
+ * @throws SecurityException if the security check fails
+ * @since 1.1
+ */
+ public Method[] getMethods()
+ {
+ memberAccessCheck(Member.PUBLIC);
+ // NOTE the API docs claim that no methods are returned for arrays,
+ // but Sun's implementation *does* return the public methods of Object
+ // (as would be expected), so we follow their implementation instead
+ // of their documentation.
+ return internalGetMethods();
+ }
+
+ /**
+ * Like <code>getMethods()</code> but without the security checks.
+ */
+ private Method[] internalGetMethods()
+ {
+ HashMap map = new HashMap();
+ Method[] methods;
+ Class[] interfaces = getInterfaces();
+ for(int i = 0; i < interfaces.length; i++)
+ {
+ methods = interfaces[i].internalGetMethods();
+ for(int j = 0; j < methods.length; j++)
+ {
+ map.put(new MethodKey(methods[j]), methods[j]);
+ }
+ }
+ Class superClass = getSuperclass();
+ if(superClass != null)
+ {
+ methods = superClass.internalGetMethods();
+ for(int i = 0; i < methods.length; i++)
+ {
+ map.put(new MethodKey(methods[i]), methods[i]);
+ }
+ }
+ methods = getDeclaredMethods(true);
+ for(int i = 0; i < methods.length; i++)
+ {
+ map.put(new MethodKey(methods[i]), methods[i]);
+ }
+ return (Method[])map.values().toArray(new Method[map.size()]);
+ }
+
+ /**
+ * Get the modifiers of this class. These can be decoded using Modifier,
+ * and is limited to one of public, protected, or private, and any of
+ * final, static, abstract, or interface. An array class has the same
+ * public, protected, or private modifier as its component type, and is
+ * marked final but not an interface. Primitive types and void are marked
+ * public and final, but not an interface.
+ *
+ * @return the modifiers of this class
+ * @see Modifer
+ * @since 1.1
+ */
+ public int getModifiers()
+ {
+ return VMClass.getModifiers (this, false);
+ }
+
+ /**
+ * Get the name of this class, separated by dots for package separators.
+ * If the class represents a primitive type, or void, then the
+ * name of the type as it appears in the Java programming language
+ * is returned. For instance, <code>Byte.TYPE.getName()</code>
+ * returns "byte".
+ *
+ * Arrays are specially encoded as shown on this table.
+ * <pre>
+ * array type [<em>element type</em>
+ * (note that the element type is encoded per
+ * this table)
+ * boolean Z
+ * byte B
+ * char C
+ * short S
+ * int I
+ * long J
+ * float F
+ * double D
+ * void V
+ * class or interface, alone: &lt;dotted name&gt;
+ * class or interface, as element type: L&lt;dotted name&gt;;
+ * </pre>
+ *
+ * @return the name of this class
+ */
+ public String getName()
+ {
+ return VMClass.getName (this);
+ }
+
+ /**
+ * Get a resource URL using this class's package using the
+ * getClassLoader().getResource() method. If this class was loaded using
+ * the system classloader, ClassLoader.getSystemResource() is used instead.
+ *
+ * <p>If the name you supply is absolute (it starts with a <code>/</code>),
+ * then the leading <code>/</code> is removed and it is passed on to
+ * getResource(). If it is relative, the package name is prepended, and
+ * <code>.</code>'s are replaced with <code>/</code>.
+ *
+ * <p>The URL returned is system- and classloader-dependent, and could
+ * change across implementations.
+ *
+ * @param resourceName the name of the resource, generally a path
+ * @return the URL to the resource
+ * @throws NullPointerException if name is null
+ * @since 1.1
+ */
+ public URL getResource(String resourceName)
+ {
+ String name = resourcePath(resourceName);
+ ClassLoader loader = getClassLoader();
+ if (loader == null)
+ return ClassLoader.getSystemResource(name);
+ return loader.getResource(name);
+ }
+
+ /**
+ * Get a resource using this class's package using the
+ * getClassLoader().getResourceAsStream() method. If this class was loaded
+ * using the system classloader, ClassLoader.getSystemResource() is used
+ * instead.
+ *
+ * <p>If the name you supply is absolute (it starts with a <code>/</code>),
+ * then the leading <code>/</code> is removed and it is passed on to
+ * getResource(). If it is relative, the package name is prepended, and
+ * <code>.</code>'s are replaced with <code>/</code>.
+ *
+ * <p>The URL returned is system- and classloader-dependent, and could
+ * change across implementations.
+ *
+ * @param resourceName the name of the resource, generally a path
+ * @return an InputStream with the contents of the resource in it, or null
+ * @throws NullPointerException if name is null
+ * @since 1.1
+ */
+ public InputStream getResourceAsStream(String resourceName)
+ {
+ String name = resourcePath(resourceName);
+ ClassLoader loader = getClassLoader();
+ if (loader == null)
+ return ClassLoader.getSystemResourceAsStream(name);
+ return loader.getResourceAsStream(name);
+ }
+
+ private String resourcePath(String resourceName)
+ {
+ if (resourceName.length() > 0)
+ {
+ if (resourceName.charAt(0) != '/')
+ {
+ String pkg = getPackagePortion(getName());
+ if (pkg.length() > 0)
+ resourceName = pkg.replace('.','/') + '/' + resourceName;
+ }
+ else
+ {
+ resourceName = resourceName.substring(1);
+ }
+ }
+ return resourceName;
+ }
+
+ /**
+ * Get the signers of this class. This returns null if there are no signers,
+ * such as for primitive types or void.
+ *
+ * @return the signers of this class
+ * @since 1.1
+ */
+ public Object[] getSigners()
+ {
+ return signers == null ? null : (Object[]) signers.clone ();
+ }
+
+ /**
+ * Set the signers of this class.
+ *
+ * @param signers the signers of this class
+ */
+ void setSigners(Object[] signers)
+ {
+ this.signers = signers;
+ }
+
+ /**
+ * Get the direct superclass of this class. If this is an interface,
+ * Object, a primitive type, or void, it will return null. If this is an
+ * array type, it will return Object.
+ *
+ * @return the direct superclass of this class
+ */
+ public Class getSuperclass()
+ {
+ return VMClass.getSuperclass (this);
+ }
+
+ /**
+ * Return whether this class is an array type.
+ *
+ * @return whether this class is an array type
+ * @since 1.1
+ */
+ public boolean isArray()
+ {
+ return VMClass.isArray (this);
+ }
+
+ /**
+ * Discover whether an instance of the Class parameter would be an
+ * instance of this Class as well. Think of doing
+ * <code>isInstance(c.newInstance())</code> or even
+ * <code>c.newInstance() instanceof (this class)</code>. While this
+ * checks widening conversions for objects, it must be exact for primitive
+ * types.
+ *
+ * @param c the class to check
+ * @return whether an instance of c would be an instance of this class
+ * as well
+ * @throws NullPointerException if c is null
+ * @since 1.1
+ */
+ public boolean isAssignableFrom(Class c)
+ {
+ return VMClass.isAssignableFrom (this, c);
+ }
+
+ /**
+ * Discover whether an Object is an instance of this Class. Think of it
+ * as almost like <code>o instanceof (this class)</code>.
+ *
+ * @param o the Object to check
+ * @return whether o is an instance of this class
+ * @since 1.1
+ */
+ public boolean isInstance(Object o)
+ {
+ return VMClass.isInstance (this, o);
+ }
+
+ /**
+ * Check whether this class is an interface or not. Array types are not
+ * interfaces.
+ *
+ * @return whether this class is an interface or not
+ */
+ public boolean isInterface()
+ {
+ return VMClass.isInterface (this);
+ }
+
+ /**
+ * Return whether this class is a primitive type. A primitive type class
+ * is a class representing a kind of "placeholder" for the various
+ * primitive types, or void. You can access the various primitive type
+ * classes through java.lang.Boolean.TYPE, java.lang.Integer.TYPE, etc.,
+ * or through boolean.class, int.class, etc.
+ *
+ * @return whether this class is a primitive type
+ * @see Boolean#TYPE
+ * @see Byte#TYPE
+ * @see Character#TYPE
+ * @see Short#TYPE
+ * @see Integer#TYPE
+ * @see Long#TYPE
+ * @see Float#TYPE
+ * @see Double#TYPE
+ * @see Void#TYPE
+ * @since 1.1
+ */
+ public boolean isPrimitive()
+ {
+ return VMClass.isPrimitive (this);
+ }
+
+ /**
+ * Get a new instance of this class by calling the no-argument constructor.
+ * The class is initialized if it has not been already. A security check
+ * may be performed, with <code>checkMemberAccess(this, Member.PUBLIC)</code>
+ * as well as <code>checkPackageAccess</code> both having to succeed.
+ *
+ * @return a new instance of this class
+ * @throws InstantiationException if there is not a no-arg constructor
+ * for this class, including interfaces, abstract classes, arrays,
+ * primitive types, and void; or if an exception occurred during
+ * the constructor
+ * @throws IllegalAccessException if you are not allowed to access the
+ * no-arg constructor because of scoping reasons
+ * @throws SecurityException if the security check fails
+ * @throws ExceptionInInitializerError if class initialization caused by
+ * this call fails with an exception
+ */
+ public Object newInstance()
+ throws InstantiationException, IllegalAccessException
+ {
+ memberAccessCheck(Member.PUBLIC);
+ Constructor constructor;
+ synchronized(this)
+ {
+ constructor = this.constructor;
+ }
+ if (constructor == null)
+ {
+ Constructor[] constructors = getDeclaredConstructors(false);
+ for (int i = 0; i < constructors.length; i++)
+ {
+ if (constructors[i].getParameterTypes().length == 0)
+ {
+ constructor = constructors[i];
+ break;
+ }
+ }
+ if (constructor == null)
+ throw new InstantiationException(getName());
+ if (!Modifier.isPublic(constructor.getModifiers())
+ || !Modifier.isPublic(VMClass.getModifiers(this, true)))
+ {
+ final Constructor finalConstructor = constructor;
+ AccessController.doPrivileged(new PrivilegedAction()
+ {
+ public Object run()
+ {
+ finalConstructor.setAccessible(true);
+ return null;
+ }
+ });
+ }
+ synchronized(this)
+ {
+ if (this.constructor == null)
+ this.constructor = constructor;
+ }
+ }
+ int modifiers = constructor.getModifiers();
+ if (!Modifier.isPublic(modifiers)
+ || !Modifier.isPublic(VMClass.getModifiers(this, true)))
+ {
+ Class caller = VMStackWalker.getCallingClass();
+ if (caller != null &&
+ caller != this &&
+ (Modifier.isPrivate(modifiers)
+ || getClassLoader() != caller.getClassLoader()
+ || !getPackagePortion(getName())
+ .equals(getPackagePortion(caller.getName()))))
+ throw new IllegalAccessException(getName()
+ + " has an inaccessible constructor");
+ }
+ try
+ {
+ return constructor.newInstance(null);
+ }
+ catch (InvocationTargetException e)
+ {
+ VMClass.throwException(e.getTargetException());
+ throw (InternalError) new InternalError
+ ("VMClass.throwException returned").initCause(e);
+ }
+ }
+
+ /**
+ * Returns the protection domain of this class. If the classloader did not
+ * record the protection domain when creating this class the unknown
+ * protection domain is returned which has a <code>null</code> code source
+ * and all permissions. A security check may be performed, with
+ * <code>RuntimePermission("getProtectionDomain")</code>.
+ *
+ * @return the protection domain
+ * @throws SecurityException if the security manager exists and the caller
+ * does not have <code>RuntimePermission("getProtectionDomain")</code>.
+ * @see RuntimePermission
+ * @since 1.2
+ */
+ public ProtectionDomain getProtectionDomain()
+ {
+ SecurityManager sm = SecurityManager.current;
+ if (sm != null)
+ sm.checkPermission(new RuntimePermission("getProtectionDomain"));
+
+ return pd == null ? StaticData.unknownProtectionDomain : pd;
+ }
+
+ /**
+ * Return the human-readable form of this Object. For an object, this
+ * is either "interface " or "class " followed by <code>getName()</code>,
+ * for primitive types and void it is just <code>getName()</code>.
+ *
+ * @return the human-readable form of this Object
+ */
+ public String toString()
+ {
+ if (isPrimitive())
+ return getName();
+ return (isInterface() ? "interface " : "class ") + getName();
+ }
+
+ /**
+ * Returns the desired assertion status of this class, if it were to be
+ * initialized at this moment. The class assertion status, if set, is
+ * returned; the backup is the default package status; then if there is
+ * a class loader, that default is returned; and finally the system default
+ * is returned. This method seldom needs calling in user code, but exists
+ * for compilers to implement the assert statement. Note that there is no
+ * guarantee that the result of this method matches the class's actual
+ * assertion status.
+ *
+ * @return the desired assertion status
+ * @see ClassLoader#setClassAssertionStatus(String, boolean)
+ * @see ClassLoader#setPackageAssertionStatus(String, boolean)
+ * @see ClassLoader#setDefaultAssertionStatus(boolean)
+ * @since 1.4
+ */
+ public boolean desiredAssertionStatus()
+ {
+ ClassLoader c = getClassLoader();
+ Object status;
+ if (c == null)
+ return VMClassLoader.defaultAssertionStatus();
+ if (c.classAssertionStatus != null)
+ synchronized (c)
+ {
+ status = c.classAssertionStatus.get(getName());
+ if (status != null)
+ return status.equals(Boolean.TRUE);
+ }
+ else
+ {
+ status = ClassLoader.StaticData.
+ systemClassAssertionStatus.get(getName());
+ if (status != null)
+ return status.equals(Boolean.TRUE);
+ }
+ if (c.packageAssertionStatus != null)
+ synchronized (c)
+ {
+ String name = getPackagePortion(getName());
+ if ("".equals(name))
+ status = c.packageAssertionStatus.get(null);
+ else
+ do
+ {
+ status = c.packageAssertionStatus.get(name);
+ name = getPackagePortion(name);
+ }
+ while (! "".equals(name) && status == null);
+ if (status != null)
+ return status.equals(Boolean.TRUE);
+ }
+ else
+ {
+ String name = getPackagePortion(getName());
+ if ("".equals(name))
+ status = ClassLoader.StaticData.
+ systemPackageAssertionStatus.get(null);
+ else
+ do
+ {
+ status = ClassLoader.StaticData.
+ systemPackageAssertionStatus.get(name);
+ name = getPackagePortion(name);
+ }
+ while (! "".equals(name) && status == null);
+ if (status != null)
+ return status.equals(Boolean.TRUE);
+ }
+ return c.defaultAssertionStatus;
+ }
+
+ /**
+ * Like <code>getField(String)</code> but without the security checks and returns null
+ * instead of throwing NoSuchFieldException.
+ */
+ private Field internalGetField(String name)
+ {
+ Field[] fields = getDeclaredFields(true);
+ for (int i = 0; i < fields.length; i++)
+ {
+ Field field = fields[i];
+ if (field.getName().equals(name))
+ return field;
+ }
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++)
+ {
+ Field field = interfaces[i].internalGetField(name);
+ if(field != null)
+ return field;
+ }
+ Class superClass = getSuperclass();
+ if (superClass != null)
+ return superClass.internalGetField(name);
+ return null;
+ }
+
+ /**
+ * Strip the last portion of the name (after the last dot).
+ *
+ * @param name the name to get package of
+ * @return the package name, or "" if no package
+ */
+ private static String getPackagePortion(String name)
+ {
+ int lastInd = name.lastIndexOf('.');
+ if (lastInd == -1)
+ return "";
+ return name.substring(0, lastInd);
+ }
+
+ /**
+ * Perform security checks common to all of the methods that
+ * get members of this Class.
+ */
+ private void memberAccessCheck(int which)
+ {
+ SecurityManager sm = SecurityManager.current;
+ if (sm != null)
+ {
+ sm.checkMemberAccess(this, which);
+ Package pkg = getPackage();
+ if (pkg != null)
+ sm.checkPackageAccess(pkg.getName());
+ }
+ }
+}