View Javadoc

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 java.lang.reflect.Method;
22  
23  import javax.faces.FacesException;
24  import javax.faces.view.facelets.TagConfig;
25  import javax.faces.view.facelets.TagHandler;
26  
27  import org.apache.myfaces.view.facelets.util.ParameterCheck;
28  
29  /**
30   * A TagLibrary that is composed of 1 or more TagLibrary children. Uses the chain of responsibility pattern to stop
31   * searching as soon as one of the children handles the requested method.
32   * 
33   * @author Jacob Hookom
34   * @version $Id: CompositeTagLibrary.java 1187700 2011-10-22 12:19:37Z bommel $
35   */
36  public final class CompositeTagLibrary implements TagLibrary
37  {
38  
39      private final TagLibrary[] libraries;
40  
41      public CompositeTagLibrary(TagLibrary[] libraries)
42      {
43          ParameterCheck.notNull("libraries", libraries);
44          this.libraries = libraries;
45      }
46  
47      /*
48       * (non-Javadoc)
49       * 
50       * @see org.apache.myfaces.view.facelets.tag.TagLibrary#containsNamespace(java.lang.String)
51       */
52      public boolean containsNamespace(String ns)
53      {
54          for (int i = 0; i < this.libraries.length; i++)
55          {
56              if (this.libraries[i].containsNamespace(ns))
57              {
58                  return true;
59              }
60          }
61          return false;
62      }
63  
64      /*
65       * (non-Javadoc)
66       * 
67       * @see org.apache.myfaces.view.facelets.tag.TagLibrary#containsTagHandler(java.lang.String, java.lang.String)
68       */
69      public boolean containsTagHandler(String ns, String localName)
70      {
71          for (int i = 0; i < this.libraries.length; i++)
72          {
73              if (this.libraries[i].containsTagHandler(ns, localName))
74              {
75                  return true;
76              }
77          }
78          return false;
79      }
80  
81      /*
82       * (non-Javadoc)
83       * 
84       * @see org.apache.myfaces.view.facelets.tag.TagLibrary#createTagHandler(java.lang.String, java.lang.String,
85       * org.apache.myfaces.view.facelets.tag.TagConfig)
86       */
87      public TagHandler createTagHandler(String ns, String localName, TagConfig tag) throws FacesException
88      {
89          for (int i = 0; i < this.libraries.length; i++)
90          {
91              if (this.libraries[i].containsTagHandler(ns, localName))
92              {
93                  return this.libraries[i].createTagHandler(ns, localName, tag);
94              }
95          }
96          return null;
97      }
98  
99      /*
100      * (non-Javadoc)
101      * 
102      * @see org.apache.myfaces.view.facelets.tag.TagLibrary#containsFunction(java.lang.String, java.lang.String)
103      */
104     public boolean containsFunction(String ns, String name)
105     {
106         for (int i = 0; i < this.libraries.length; i++)
107         {
108             if (this.libraries[i].containsFunction(ns, name))
109             {
110                 return true;
111             }
112         }
113         return false;
114     }
115 
116     /*
117      * (non-Javadoc)
118      * 
119      * @see org.apache.myfaces.view.facelets.tag.TagLibrary#createFunction(java.lang.String, java.lang.String)
120      */
121     public Method createFunction(String ns, String name)
122     {
123         for (int i = 0; i < this.libraries.length; i++)
124         {
125             if (this.libraries[i].containsFunction(ns, name))
126             {
127                 return this.libraries[i].createFunction(ns, name);
128             }
129         }
130         return null;
131     }
132 }