001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.proxy2.invoker;
019
020import java.lang.reflect.InvocationTargetException;
021import java.lang.reflect.Method;
022
023import org.apache.commons.lang3.Validate;
024import org.apache.commons.proxy2.Invoker;
025import org.apache.commons.proxy2.ObjectProvider;
026
027/**
028 * Delegates a method invocation to the object provided by an {@link ObjectProvider}.
029 * 
030 * @param <T>
031 */
032public class DelegatingInvoker<T> implements Invoker
033{
034    private static final long serialVersionUID = 1L;
035
036    private final ObjectProvider<? extends T> delegateProvider;
037
038    public DelegatingInvoker(ObjectProvider<? extends T> delegateProvider)
039    {
040        super();
041        this.delegateProvider = Validate.notNull(delegateProvider);
042    }
043
044    @Override
045    public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable
046    {
047        try
048        {
049            return method.invoke(delegateProvider.getObject(), arguments);
050        }
051        catch (InvocationTargetException e)
052        {
053            throw e.getTargetException();
054        }
055    }
056
057}