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.myfaces.view.facelets.tag;
20
21 import javax.faces.view.facelets.Tag;
22 import javax.faces.view.facelets.TagDecorator;
23
24 import org.apache.myfaces.view.facelets.util.ParameterCheck;
25
26 /**
27 * A TagDecorator that is composed of 1 or more TagDecorator instances. It uses the chain of responsibility pattern to
28 * stop processing if any of the TagDecorators return a value other than null.
29 *
30 * @author Jacob Hookom
31 * @version $Id$
32 */
33 public final class CompositeTagDecorator implements TagDecorator
34 {
35
36 private final TagDecorator[] decorators;
37
38 public CompositeTagDecorator(TagDecorator[] decorators)
39 {
40 ParameterCheck.notNull("decorators", decorators);
41 this.decorators = decorators;
42 }
43
44 /**
45 * Uses the chain of responsibility pattern to stop processing if any of the TagDecorators return a value other than
46 * null.
47 *
48 * @see javax.faces.view.facelets.TagDecorator#decorate(javax.faces.view.facelets.Tag)
49 */
50 public Tag decorate(Tag tag)
51 {
52 Tag t = null;
53 for (int i = 0; i < this.decorators.length; i++)
54 {
55 t = this.decorators[i].decorate(tag);
56 if (t != null)
57 {
58 return t;
59 }
60 }
61 return tag;
62 }
63
64 }
65