1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.proxy2.invoker;
19
20 import java.lang.reflect.InvocationTargetException;
21 import java.lang.reflect.Method;
22
23 import org.apache.commons.lang3.Validate;
24 import org.apache.commons.proxy2.Invoker;
25 import org.apache.commons.proxy2.ObjectProvider;
26
27 /**
28 * Delegates a method invocation to the object provided by an {@link ObjectProvider}.
29 *
30 * @param <T>
31 */
32 public class DelegatingInvoker<T> implements Invoker
33 {
34 private static final long serialVersionUID = 1L;
35
36 private final ObjectProvider<? extends T> delegateProvider;
37
38 public DelegatingInvoker(ObjectProvider<? extends T> delegateProvider)
39 {
40 super();
41 this.delegateProvider = Validate.notNull(delegateProvider);
42 }
43
44 @Override
45 public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable
46 {
47 try
48 {
49 return method.invoke(delegateProvider.getObject(), arguments);
50 }
51 catch (InvocationTargetException e)
52 {
53 throw e.getTargetException();
54 }
55 }
56
57 }