org.apache.jetspeed.util.BaseObjectProxy Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jetspeed.util;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
* BaseObjectProxy
*
* @author Woonsan Ko
* @version $Id: BaseObjectProxy.java 516448 2007-03-09 16:25:47Z ate $
*/
public class BaseObjectProxy implements InvocationHandler
{
protected static Method hashCodeMethod;
protected static Method equalsMethod;
protected static Method toStringMethod;
static
{
try
{
hashCodeMethod = Object.class.getMethod("hashCode", (Class [])null);
equalsMethod = Object.class.getMethod("equals", new Class [] { Object.class });
toStringMethod = Object.class.getMethod("toString", (Class [])null);
}
catch (NoSuchMethodException e)
{
throw new NoSuchMethodError(e.getMessage());
}
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
{
Object result = null;
Class declaringClass = method.getDeclaringClass();
if (declaringClass == Object.class)
{
if (hashCodeMethod.equals(method))
{
result = proxyHashCode(proxy);
}
else if (equalsMethod.equals(method))
{
result = proxyEquals(proxy, args[0]);
}
else if (toStringMethod.equals(method))
{
result = proxyToString(proxy);
}
else
{
throw new InternalError("unexpected Object method dispatched: " + method);
}
}
else
{
throw new InternalError("unexpected Object method dispatched: " + method);
}
return result;
}
protected Integer proxyHashCode(Object proxy)
{
return new Integer(System.identityHashCode(proxy));
}
protected Boolean proxyEquals(Object proxy, Object other)
{
return (proxy == other ? Boolean.TRUE : Boolean.FALSE);
}
protected String proxyToString(Object proxy)
{
return proxy.getClass().getName() + '@' + Integer.toHexString(proxy.hashCode());
}
}