2006-06-09 Jeroen Frijters <jeroen@frijters.net>

        * sun/reflect/annotation/AnnotationInvocationHandler.java:
        New file.

1 files changed, 340 insertions, 0 deletions

diff --git a/sun/reflect/annotation/AnnotationInvocationHandler.java b/sun/reflect/annotation/AnnotationInvocationHandler.java
new file mode 100644
index 000000000..ab9ad13d8
--- /dev/null
+++ b/sun/reflect/annotation/AnnotationInvocationHandler.java
@@ -0,0 +1,340 @@
+/* sun.reflect.annotation.AnnotationInvocationHandler
+   Copyright (C) 2006
+   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 sun.reflect.annotation;
+
+import java.io.Serializable;
+import java.lang.annotation.AnnotationTypeMismatchException;
+import java.lang.annotation.IncompleteAnnotationException;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.Map;
+
+/**
+ * This class exists for serialization compatibility with the JDK.
+ * VMs can choose to implement annotations by constructing proxies
+ * with this invocation handler, but that is not required.
+ * If a different strategy for proxy objects is chosen, they can
+ * have a writeReplace method to substitute a Proxy based on this
+ * invocation handler is used for serialization.
+ */
+public final class AnnotationInvocationHandler
+  implements InvocationHandler, Serializable
+{
+    private static final long serialVersionUID = 6182022883658399397L;
+    private final Class type;
+    private final Map memberValues;
+
+    /**
+     * Construct a new invocation handler for an annotation proxy.
+     * Note that the VM is responsible for filling the memberValues map
+     * with the default values of all the annotation members.
+     */
+    public AnnotationInvocationHandler(Class type, Map memberValues)
+    {
+        this.type = type;
+        this.memberValues = memberValues;
+    }
+
+    /**
+     * Compare an instance of AnnotationInvocationHandler with another object.
+     * Note that the other object does not have to be an
+     * AnnotationInvocationHandler, any implementation of the annotation
+     * interface is allowed to be compared for equality.
+     * Note that this makes the equals method asymmetric, but this behavior
+     * is specified by Annotation.equals and identical to the JDK.
+     *
+     * This method is public for use by other parts of the VM. Some VMs
+     * (can) use different representations of annotations that reuse this
+     * method.
+     */
+    public static boolean equals(Class type, Map memberValues, Object other)
+    {
+        if (type.isInstance(other))
+        {
+            try
+            {
+                Method[] methods = type.getDeclaredMethods();
+                if (methods.length == memberValues.size())
+                {
+                    for (int i = 0; i < methods.length; i++)
+                    {
+                        String key = methods[i].getName();
+                        Object val = methods[i].invoke(other, new Object[0]);
+                        if (! deepEquals(memberValues.get(key), val))
+                        {
+                            return false;
+                        }
+                    }
+                    return true;
+                }
+            }
+            catch (IllegalAccessException _)
+            {
+                // Ignore exception, like the JDK
+            }
+            catch (InvocationTargetException _)
+            {
+                // Ignore exception, like the JDK
+            }
+        }
+        return false;
+    }
+
+    private static boolean deepEquals(Object o1, Object o2)
+    {
+        if (o1 == o2)
+            return true;
+
+        if (o1 == null || o2 == null)
+            return false;
+
+        if (o1 instanceof boolean[] && o2 instanceof boolean[])
+            return Arrays.equals((boolean[]) o1, (boolean[]) o2);
+
+        if (o1 instanceof byte[] && o2 instanceof byte[])
+            return Arrays.equals((byte[]) o1, (byte[]) o2);
+
+        if (o1 instanceof char[] && o2 instanceof char[])
+            return Arrays.equals((char[]) o1, (char[]) o2);
+
+        if (o1 instanceof short[] && o2 instanceof short[])
+            return Arrays.equals((short[]) o1, (short[]) o2);
+
+        if (o1 instanceof int[] && o2 instanceof int[])
+            return Arrays.equals((int[]) o1, (int[]) o2);
+
+        if (o1 instanceof float[] && o2 instanceof float[])
+            return Arrays.equals((float[]) o1, (float[]) o2);
+
+        if (o1 instanceof long[] && o2 instanceof long[])
+            return Arrays.equals((long[]) o1, (long[]) o2);
+
+        if (o1 instanceof double[] && o2 instanceof double[])
+            return Arrays.equals((double[]) o1, (double[]) o2);
+
+        if (o1 instanceof Object[] && o2 instanceof Object[])
+            return Arrays.equals((Object[]) o1, (Object[]) o2);
+
+        return o1.equals(o2);
+    }
+
+    private static int deepHashCode(Object obj)
+    {
+        if (obj instanceof boolean[])
+            return Arrays.hashCode((boolean[]) obj);
+
+        if (obj instanceof byte[])
+            return Arrays.hashCode((byte[]) obj);
+
+        if (obj instanceof char[])
+            return Arrays.hashCode((char[]) obj);
+
+        if (obj instanceof short[])
+            return Arrays.hashCode((short[]) obj);
+
+        if (obj instanceof int[])
+            return Arrays.hashCode((int[]) obj);
+
+        if (obj instanceof float[])
+            return Arrays.hashCode((float[]) obj);
+
+        if (obj instanceof long[])
+            return Arrays.hashCode((long[]) obj);
+
+        if (obj instanceof double[])
+            return Arrays.hashCode((double[]) obj);
+
+        if (obj instanceof Object[])
+            return Arrays.hashCode((Object[]) obj);
+
+        return obj.hashCode();
+    }
+
+    /**
+     * Compute the hashCode for an annotation. Note that the algorithm is
+     * specified by Annotation.hashCode.
+     *
+     * This method is public for use by other parts of the VM. Some VMs
+     * (can) use different representations of annotations that reuse this
+     * method.
+     */
+    public static int hashCode(Class type, Map memberValues)
+    {
+        int h = 0;
+        Iterator iter = memberValues.keySet().iterator();
+        while (iter.hasNext())
+        {
+            Object key = iter.next();
+            Object val = memberValues.get(key);
+            h += deepHashCode(val) ^ 127 * key.hashCode();
+        }
+        return h;
+    }
+
+    private static String deepToString(Object obj)
+    {
+        if (obj instanceof boolean[])
+            return Arrays.toString((boolean[]) obj);
+
+        if (obj instanceof byte[])
+            return Arrays.toString((byte[]) obj);
+
+        if (obj instanceof char[])
+            return Arrays.toString((char[]) obj);
+
+        if (obj instanceof short[])
+            return Arrays.toString((short[]) obj);
+
+        if (obj instanceof int[])
+            return Arrays.toString((int[]) obj);
+
+        if (obj instanceof float[])
+            return Arrays.toString((float[]) obj);
+
+        if (obj instanceof long[])
+            return Arrays.toString((long[]) obj);
+
+        if (obj instanceof double[])
+            return Arrays.toString((double[]) obj);
+
+        if (obj instanceof Object[])
+            return Arrays.toString((Object[]) obj);
+
+        return obj.toString();
+    }
+
+    /**
+     * This method is public for use by other parts of the VM. Some VMs
+     * (can) use different representations of annotations that reuse this
+     * method.
+     */
+    public static String toString(Class type, Map memberValues)
+    {
+        StringBuffer sb = new StringBuffer();
+        sb.append('@').append(type.getName()).append('(');
+        String sep = "";
+        Iterator iter = memberValues.keySet().iterator();
+        while (iter.hasNext())
+        {
+            Object key = iter.next();
+            Object val = memberValues.get(key);
+            sb.append(sep).append(key).append('=').append(deepToString(val));
+            sep = ", ";
+        }
+        sb.append(')');
+        return sb.toString();
+    }
+
+    private static Class getBoxedReturnType(Method method)
+    {
+        Class returnType = method.getReturnType();
+
+        if (returnType == boolean.class)
+            return Boolean.class;
+
+        if (returnType == byte.class)
+            return Byte.class;
+
+        if (returnType == char.class)
+            return Character.class;
+
+        if (returnType == short.class)
+            return Short.class;
+
+        if (returnType == int.class)
+            return Integer.class;
+
+        if (returnType == float.class)
+            return Float.class;
+
+        if (returnType == long.class)
+            return Long.class;
+
+        if (returnType == double.class)
+            return Double.class;
+
+        return returnType;
+    }
+
+    public Object invoke(Object proxy, Method method, Object[] args)
+      throws Throwable
+    {
+        String methodName = method.getName().intern();
+        if (args == null || args.length == 0)
+        {
+            if (methodName == "toString")
+            {
+                return toString(type, memberValues);
+            }
+            else if (methodName == "hashCode")
+            {
+                return Integer.valueOf(hashCode(type, memberValues));
+            }
+            else if (methodName == "annotationType")
+            {
+                return type;
+            }
+            else
+            {
+                Object val = memberValues.get(methodName);
+                if (val == null)
+                {
+                    throw new IncompleteAnnotationException(type, methodName);
+                }
+                if (! getBoxedReturnType(method).isInstance(val))
+                {
+                    throw new AnnotationTypeMismatchException(method,
+                        val.getClass().getName());
+                }
+                return val;
+            }
+        }
+        else if (args.length == 1)
+        {
+            if (methodName == "equals")
+            {
+                return Boolean.valueOf(equals(type, memberValues, args[0]));
+            }
+        }
+        throw new InternalError("Invalid annotation proxy");
+    }
+}