1 package org.apache.maven.doxia.sink.impl;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.lang.reflect.InvocationHandler;
23 import java.lang.reflect.InvocationTargetException;
24 import java.lang.reflect.Method;
25 import java.lang.reflect.Proxy;
26
27 import java.util.List;
28
29 import org.apache.maven.doxia.sink.Sink;
30
31 /**
32 * May be used to invoke the same method on a List of Sinks.
33 *
34 * @author <a href="mailto:trygvis@inamo.no">Trygve Laugstøl</a>
35 */
36 public class PipelineSink
37 implements InvocationHandler
38 {
39 private List<Sink> pipeline;
40
41 /**
42 * Constructs a PipelineSink for a given List of Sinks.
43 *
44 * @param pipeline A List of Sinks.
45 */
46 public PipelineSink( List<Sink> pipeline )
47 {
48 this.pipeline = pipeline;
49 }
50
51 /**
52 * Add a Sink to the List of Sinks.
53 *
54 * @param sink the Sink to add.
55 */
56 public void addSink( Sink sink )
57 {
58 pipeline.add( sink );
59 }
60
61 /**
62 * {@inheritDoc}
63 *
64 * Invoke a Method on this PipelineSink.
65 *
66 * @throws IllegalAccessException if any.
67 * @throws InvocationTargetException if any.
68 * @param proxy a {@link java.lang.Object} object.
69 * @param method a {@link java.lang.reflect.Method} object.
70 * @param args an array of {@link java.lang.Object} objects.
71 * @return a {@link java.lang.Object} object.
72 */
73 public Object invoke( Object proxy, Method method, Object[] args )
74 throws IllegalAccessException, InvocationTargetException
75 {
76 for ( Sink sink : pipeline )
77 {
78 method.invoke( sink, args );
79 }
80
81 return null;
82 }
83
84 /**
85 * Returns an instance of a PipelineSink as a Sink.
86 *
87 * @param pipeline A List of Sinks.
88 * @return a {@link org.apache.maven.doxia.sink.Sink} object.
89 */
90 public static Sink newInstance( List<Sink> pipeline )
91 {
92 return (Sink) Proxy.newProxyInstance( PipelineSink.class.getClassLoader(),
93 new Class<?>[]{Sink.class},
94 new PipelineSink( pipeline ) );
95 }
96 }