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;
- }
-
- public static Annotation create(Class type, Map memberValues)
- {
- for (Method m : type.getDeclaredMethods())
- {
- String name = m.getName();
- if (! memberValues.containsKey(name))
- {
- // FIXME: what to do about exceptions here?
- memberValues.put(name, m.getDefaultValue());
- }
- }
- AnnotationInvocationHandler handler
- = new AnnotationInvocationHandler(type, memberValues);
- return (Annotation) Proxy.newProxyInstance(type.getClassLoader(),
- new Class[] { type },
- handler);
- }
-
- /**
- * 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);
+ 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;
+ }
+
+ public static Annotation create(Class type, Map memberValues)
+ {
+ for (Method m : type.getDeclaredMethods())
+ {
+ String name = m.getName();
+ if (! memberValues.containsKey(name))
+ {
+ // FIXME: what to do about exceptions here?
+ memberValues.put(name, m.getDefaultValue());
+ }
+ }
+ AnnotationInvocationHandler handler
+ = new AnnotationInvocationHandler(type, memberValues);
+ return (Annotation) Proxy.newProxyInstance(type.getClassLoader(),
+ new Class[] { type },
+ handler);
+ }
+
+ /**
+ * 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 byte[])
+ return Arrays.toString((byte[]) obj);
- if (obj instanceof char[])
- return Arrays.toString((char[]) obj);
+ if (obj instanceof char[])
+ return Arrays.toString((char[]) obj);
- if (obj instanceof short[])
- return Arrays.toString((short[]) obj);
+ if (obj instanceof short[])
+ return Arrays.toString((short[]) obj);
- if (obj instanceof int[])
- return Arrays.toString((int[]) obj);
+ if (obj instanceof int[])
+ return Arrays.toString((int[]) obj);
- if (obj instanceof float[])
- return Arrays.toString((float[]) obj);
+ if (obj instanceof float[])
+ return Arrays.toString((float[]) obj);
- if (obj instanceof long[])
- return Arrays.toString((long[]) obj);
+ if (obj instanceof long[])
+ return Arrays.toString((long[]) obj);
- if (obj instanceof double[])
- return Arrays.toString((double[]) 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;
- }
-
- private Object arrayClone(Object obj)
- {
- if (obj instanceof boolean[])
- return ((boolean[]) obj).clone();
-
- if (obj instanceof byte[])
- return ((byte[]) obj).clone();
-
- if (obj instanceof char[])
- return ((char[]) obj).clone();
-
- if (obj instanceof short[])
- return ((short[]) obj).clone();
-
- if (obj instanceof int[])
- return ((int[]) obj).clone();
-
- if (obj instanceof float[])
- return ((float[]) obj).clone();
-
- if (obj instanceof long[])
- return ((long[]) obj).clone();
-
- if (obj instanceof double[])
- return ((double[]) obj).clone();
-
- if (obj instanceof Object[])
- return ((Object[]) obj).clone();
-
- return obj;
- }
-
- 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());
- }
- if (val.getClass().isArray())
- {
- val = arrayClone(val);
- }
- return val;
- }
- }
- else if (args.length == 1)
- {
- if (methodName == "equals")
- {
- return Boolean.valueOf(equals(type, memberValues, args[0]));
- }
- }
- throw new InternalError("Invalid annotation proxy");
- }
+ 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;
+ }
+
+ private Object arrayClone(Object obj)
+ {
+ if (obj instanceof boolean[])
+ return ((boolean[]) obj).clone();
+
+ if (obj instanceof byte[])
+ return ((byte[]) obj).clone();
+
+ if (obj instanceof char[])
+ return ((char[]) obj).clone();
+
+ if (obj instanceof short[])
+ return ((short[]) obj).clone();
+
+ if (obj instanceof int[])
+ return ((int[]) obj).clone();
+
+ if (obj instanceof float[])
+ return ((float[]) obj).clone();
+
+ if (obj instanceof long[])
+ return ((long[]) obj).clone();
+
+ if (obj instanceof double[])
+ return ((double[]) obj).clone();
+
+ if (obj instanceof Object[])
+ return ((Object[]) obj).clone();
+
+ return obj;
+ }
+
+ 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());
+ }
+ if (val.getClass().isArray())
+ {
+ val = arrayClone(val);
+ }
+ return val;
+ }
+ }
+ else if (args.length == 1)
+ {
+ if (methodName == "equals")
+ {
+ return Boolean.valueOf(equals(type, memberValues, args[0]));
+ }
+ }
+ throw new InternalError("Invalid annotation proxy");
+ }
}
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