1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.maven.doxia.sink.impl;
20
21 import java.lang.reflect.InvocationHandler;
22 import java.lang.reflect.InvocationTargetException;
23 import java.lang.reflect.Method;
24 import java.util.List;
25
26 import org.apache.maven.doxia.sink.Sink;
27
28 /**
29 * A proxy for a Sink which captures all event/method names called on it.
30 */
31 public class EventCapturingSinkProxy implements InvocationHandler {
32
33 private final Sink sink;
34 private final List<String> capturedEventNames;
35
36 /**
37 *
38 * @param sink
39 * @param capturedEventNames the list to receive the captured event/method names
40 * @return a new, proxied sink
41 */
42 public static Sink newInstance(Sink sink, List<String> capturedEventNames) {
43 return (Sink) java.lang.reflect.Proxy.newProxyInstance(
44 sink.getClass().getClassLoader(),
45 new Class<?>[] {Sink.class},
46 new EventCapturingSinkProxy(sink, capturedEventNames));
47 }
48
49 private EventCapturingSinkProxy(Sink sink, List<String> capturedEventNames) {
50 this.sink = sink;
51 this.capturedEventNames = capturedEventNames;
52 }
53
54 @Override
55 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
56 Object result;
57 try {
58 capturedEventNames.add(method.getName());
59 result = method.invoke(sink, args);
60 } catch (InvocationTargetException e) {
61 throw e.getTargetException();
62 }
63 return result;
64 }
65 }