/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.solder.reflection;
import java.io.IOException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* Class that handles the method calls for a {@link Proxy} that
* implements an annotation.
*
* @author Stuart Douglas
* @see AnnotationInstanceProvider
*/
class AnnotationInvocationHandler implements InvocationHandler, Serializable {
private static class SerializationProxy {
private final Map<String, ?> valueMap;
private final Class<? extends Annotation> annotationType;
private SerializationProxy(Map<String, ?> valueMap, Class<? extends Annotation> annotationType) {
this.valueMap = valueMap;
this.annotationType = annotationType;
}
private Object readResolve() throws ObjectStreamException {
return new AnnotationInvocationHandler(valueMap, annotationType);
}
}
private static final long serialVersionUID = 4801508041776645033L;
private final Map<String, Object> valueMap;
private final Class<? extends Annotation> annotationType;
private final Method[] members;
AnnotationInvocationHandler(Map<String, ?> values, Class<? extends Annotation> annotationType) {
this.valueMap = new HashMap<String, Object>();
valueMap.putAll(values);
this.annotationType = annotationType;
this.members = annotationType.getDeclaredMethods();
for (Method m : members) {
Object value = valueMap.get(m.getName());
if (value == null) {
value = m.getDefaultValue();
if (value == null) {
throw new NullMemberException(annotationType, m, "Error creating annotation @" + annotationType.getName() + " member " + m.getName() + " was null and does not provide a default value");
} else {
valueMap.put(m.getName(), value);
}
}
}
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("equals")) {
return equals(args[0]);
} else if (method.getName().equals("hashCode")) {
return hashCode();
} else if (method.getName().equals("toString")) {
return toString();
} else if (method.getName().equals("annotationType")) {
return annotationType;
} else {
Object val = valueMap.get(method.getName());
Class<?> r = method.getReturnType();
val = performTypeCoercion(val, r);
return val;
}
}
private Object performTypeCoercion(Object val, Class<?> type) {
if (Integer.class.isAssignableFrom(type) || type == int.class) {
return ((Number) val).intValue();
} else if (Long.class.isAssignableFrom(type) || type == long.class) {
return ((Number) val).longValue();
} else if (Short.class.isAssignableFrom(type) || type == short.class) {
return ((Number) val).shortValue();
} else if (Byte.class.isAssignableFrom(type) || type == byte.class) {
return ((Number) val).byteValue();
} else if (Double.class.isAssignableFrom(type) || type == double.class) {
return ((Number) val).doubleValue();
} else if (Float.class.isAssignableFrom(type) || type == float.class) {
return ((Number) val).floatValue();
} else if (Character.class.isAssignableFrom(type) || type == char.class) {
if (String.class.isAssignableFrom(val.getClass())) {
return val.toString().charAt(0);
}
}
return val;
}
@Override
public String toString() {
StringBuilder string = new StringBuilder();
string.append('@').append(annotationType.getName()).append('(');
for (int i = 0; i < members.length; i++) {
string.append(members[i].getName()).append('=');
Object value = performTypeCoercion(valueMap.get(members[i].getName()), members[i].getReturnType());
if (value instanceof boolean[]) {
appendInBraces(string, Arrays.toString((boolean[]) value));
} else if (value instanceof byte[]) {
appendInBraces(string, Arrays.toString((byte[]) value));
} else if (value instanceof short[]) {
appendInBraces(string, Arrays.toString((short[]) value));
} else if (value instanceof int[]) {
appendInBraces(string, Arrays.toString((int[]) value));
} else if (value instanceof long[]) {
appendInBraces(string, Arrays.toString((long[]) value));
} else if (value instanceof float[]) {
appendInBraces(string, Arrays.toString((float[]) value));
} else if (value instanceof double[]) {
appendInBraces(string, Arrays.toString((double[]) value));
} else if (value instanceof char[]) {
appendInBraces(string, Arrays.toString((char[]) value));
} else if (value instanceof String[]) {
String[] strings = (String[]) value;
String[] quoted = new String[strings.length];
for (int j = 0; j < strings.length; j++) {
quoted[j] = "\"" + strings[j] + "\"";
}
appendInBraces(string, Arrays.toString(quoted));
} else if (value instanceof Class<?>[]) {
Class<?>[] classes = (Class<?>[]) value;
String[] names = new String[classes.length];
for (int j = 0; j < classes.length; j++) {
names[j] = classes[j].getName() + ".class";
}
appendInBraces(string, Arrays.toString(names));
} else if (value instanceof Object[]) {
appendInBraces(string, Arrays.toString((Object[]) value));
} else if (value instanceof String) {
string.append('"').append(value).append('"');
} else if (value instanceof Class<?>) {
string.append(((Class<?>) value).getName()).append(".class");
} else {
string.append(value);
}
if (i < members.length - 1) {
string.append(", ");
}
}
return string.append(')').toString();
}
private void appendInBraces(StringBuilder buf, String s) {
buf.append('{').append(s.substring(1, s.length() - 1)).append('}');
}
@Override
public boolean equals(Object other) {
if (other instanceof Annotation) {
Annotation that = (Annotation) other;
if (this.annotationType.equals(that.annotationType())) {
for (Method member : members) {
Object thisValue = performTypeCoercion(valueMap.get(member.getName()), member.getReturnType());
Object thatValue = invoke(member, that);
if (thisValue instanceof byte[] && thatValue instanceof byte[]) {
if (!Arrays.equals((byte[]) thisValue, (byte[]) thatValue))
return false;
} else if (thisValue instanceof short[] && thatValue instanceof short[]) {
if (!Arrays.equals((short[]) thisValue, (short[]) thatValue))
return false;
} else if (thisValue instanceof int[] && thatValue instanceof int[]) {
if (!Arrays.equals((int[]) thisValue, (int[]) thatValue))
return false;
} else if (thisValue instanceof long[] && thatValue instanceof long[]) {
if (!Arrays.equals((long[]) thisValue, (long[]) thatValue))
return false;
} else if (thisValue instanceof float[] && thatValue instanceof float[]) {
if (!Arrays.equals((float[]) thisValue, (float[]) thatValue))
return false;
} else if (thisValue instanceof double[] && thatValue instanceof double[]) {
if (!Arrays.equals((double[]) thisValue, (double[]) thatValue))
return false;
} else if (thisValue instanceof char[] && thatValue instanceof char[]) {
if (!Arrays.equals((char[]) thisValue, (char[]) thatValue))
return false;
} else if (thisValue instanceof boolean[] && thatValue instanceof boolean[]) {
if (!Arrays.equals((boolean[]) thisValue, (boolean[]) thatValue))
return false;
} else if (thisValue instanceof Object[] && thatValue instanceof Object[]) {
if (!Arrays.equals((Object[]) thisValue, (Object[]) thatValue))
return false;
} else {
if (!thisValue.equals(thatValue)) {
return false;
}
}
}
return true;
}
}
return false;
}
@Override
public int hashCode() {
int hashCode = 0;
for (Method member : members) {
int memberNameHashCode = 127 * member.getName().hashCode();
Object value = performTypeCoercion(valueMap.get(member.getName()), member.getReturnType());
int memberValueHashCode;
if (value instanceof boolean[]) {
memberValueHashCode = Arrays.hashCode((boolean[]) value);
} else if (value instanceof short[]) {
memberValueHashCode = Arrays.hashCode((short[]) value);
} else if (value instanceof int[]) {
memberValueHashCode = Arrays.hashCode((int[]) value);
} else if (value instanceof long[]) {
memberValueHashCode = Arrays.hashCode((long[]) value);
} else if (value instanceof float[]) {
memberValueHashCode = Arrays.hashCode((float[]) value);
} else if (value instanceof double[]) {
memberValueHashCode = Arrays.hashCode((double[]) value);
} else if (value instanceof byte[]) {
memberValueHashCode = Arrays.hashCode((byte[]) value);
} else if (value instanceof char[]) {
memberValueHashCode = Arrays.hashCode((char[]) value);
} else if (value instanceof Object[]) {
memberValueHashCode = Arrays.hashCode((Object[]) value);
} else {
memberValueHashCode = value.hashCode();
}
hashCode += memberNameHashCode ^ memberValueHashCode;
}
return hashCode;
}
private Object writeReplace() throws ObjectStreamException {
return new SerializationProxy(valueMap, annotationType);
}
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
throw new UnsupportedOperationException("Must use SerializationProxy");
}
private static Object invoke(Method method, Object instance) {
try {
if (!method.isAccessible())
method.setAccessible(true);
return method.invoke(instance);
} catch (IllegalArgumentException e) {
throw new RuntimeException("Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e);
} catch (IllegalAccessException e) {
throw new RuntimeException("Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e);
} catch (InvocationTargetException e) {
throw new RuntimeException("Error checking value of member method " + method.getName() + " on " + method.getDeclaringClass(), e);
}
}
}