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Java > Open Source Codes > com > sun > facelets > tag > CompositeTagLibrary


1 /**
2  * Licensed under the Common Development and Distribution License,
3  * you may not use this file except in compliance with the License.
4  * You may obtain a copy of the License at
5  *
6  * http://www.sun.com/cddl/
7  *
8  * Unless required by applicable law or agreed to in writing, software
9  * distributed under the License is distributed on an "AS IS" BASIS,
10  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
11  * implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14
15 package com.sun.facelets.tag;
16
17 import java.lang.reflect.Method JavaDoc;
18
19 import javax.faces.FacesException;
20
21 import com.sun.facelets.util.ParameterCheck;
22
23 /**
24  * A TagLibrary that is composed of 1 or more TagLibrary children. Uses the
25  * chain of responsibility pattern to stop searching as soon as one of the
26  * children handles the requested method.
27  *
28  * @author Jacob Hookom
29  * @version $Id: CompositeTagLibrary.java,v 1.3 2005/08/24 04:38:47 jhook Exp $
30  */
31 public final class CompositeTagLibrary implements TagLibrary {
32
33     private final TagLibrary[] libraries;
34
35     public CompositeTagLibrary(TagLibrary[] libraries) {
36         ParameterCheck.notNull("libraries", libraries);
37         this.libraries = libraries;
38     }
39
40     /*
41      * (non-Javadoc)
42      *
43      * @see com.sun.facelets.tag.TagLibrary#containsNamespace(java.lang.String)
44      */
45     public boolean containsNamespace(String JavaDoc ns) {
46         for (int i = 0; i < this.libraries.length; i++) {
47             if (this.libraries[i].containsNamespace(ns)) {
48                 return true;
49             }
50         }
51         return false;
52     }
53
54     /*
55      * (non-Javadoc)
56      *
57      * @see com.sun.facelets.tag.TagLibrary#containsTagHandler(java.lang.String,
58      * java.lang.String)
59      */
60     public boolean containsTagHandler(String JavaDoc ns, String JavaDoc localName) {
61         for (int i = 0; i < this.libraries.length; i++) {
62             if (this.libraries[i].containsTagHandler(ns, localName)) {
63                 return true;
64             }
65         }
66         return false;
67     }
68
69     /*
70      * (non-Javadoc)
71      *
72      * @see com.sun.facelets.tag.TagLibrary#createTagHandler(java.lang.String,
73      * java.lang.String, com.sun.facelets.tag.TagConfig)
74      */
75     public TagHandler createTagHandler(String JavaDoc ns, String JavaDoc localName,
76             TagConfig tag) throws FacesException {
77         for (int i = 0; i < this.libraries.length; i++) {
78             if (this.libraries[i].containsTagHandler(ns, localName)) {
79                 return this.libraries[i].createTagHandler(ns, localName, tag);
80             }
81         }
82         return null;
83     }
84
85     /*
86      * (non-Javadoc)
87      *
88      * @see com.sun.facelets.tag.TagLibrary#containsFunction(java.lang.String,
89      * java.lang.String)
90      */
91     public boolean containsFunction(String JavaDoc ns, String JavaDoc name) {
92         for (int i = 0; i < this.libraries.length; i++) {
93             if (this.libraries[i].containsFunction(ns, name)) {
94                 return true;
95             }
96         }
97         return false;
98     }
99
100     /*
101      * (non-Javadoc)
102      *
103      * @see com.sun.facelets.tag.TagLibrary#createFunction(java.lang.String,
104      * java.lang.String)
105      */
106     public Method JavaDoc createFunction(String JavaDoc ns, String JavaDoc name) {
107         for (int i = 0; i < this.libraries.length; i++) {
108             if (this.libraries[i].containsFunction(ns, name)) {
109                 return this.libraries[i].createFunction(ns, name);
110             }
111         }
112         return null;
113     }
114 }
115
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