ExtensionInvocationHandler.java

/**
 * 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.cxf.common.util;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class ExtensionInvocationHandler implements InvocationHandler {

    private Object obj;
    public ExtensionInvocationHandler(Object o) {
        obj = o;
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (method.getDeclaringClass().isAssignableFrom(obj.getClass())) {
            return method.invoke(obj, args);
        } else {
            //in case obj has the required method with exact signature despite its class
            //not being assignable from the class declaring the specified method
            Method m = obj.getClass().getMethod(method.getName(), method.getParameterTypes());
            return m.invoke(obj, args);
        }
    }
}