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.jstl.fn;
20  
21  import java.lang.reflect.Method;
22  import java.lang.reflect.Modifier;
23  import java.util.HashMap;
24  import java.util.Map;
25  
26  import javax.faces.FacesException;
27  import javax.faces.view.facelets.TagConfig;
28  import javax.faces.view.facelets.TagHandler;
29  
30  import org.apache.myfaces.view.facelets.tag.TagLibrary;
31  
32  /**
33   * Library for JSTL Functions
34   * 
35   * @author Jacob Hookom
36   * @version $Id: JstlFnLibrary.java 1187700 2011-10-22 12:19:37Z bommel $
37   */
38  public class JstlFnLibrary implements TagLibrary
39  {
40      public final static String Namespace = "http://java.sun.com/jsp/jstl/functions";
41  
42      private final Map<String, Method> fns = new HashMap<String, Method>();
43  
44      public JstlFnLibrary()
45      {
46          super();
47          try
48          {
49              Method[] methods = JstlFunction.class.getMethods();
50              for (int i = 0; i < methods.length; i++)
51              {
52                  if (Modifier.isStatic(methods[i].getModifiers()))
53                  {
54                      fns.put(methods[i].getName(), methods[i]);
55                  }
56              }
57          }
58          catch (Exception e)
59          {
60              throw new RuntimeException(e);
61          }
62      }
63  
64      public boolean containsNamespace(String ns)
65      {
66          return Namespace.equals(ns);
67      }
68  
69      public boolean containsTagHandler(String ns, String localName)
70      {
71          return false;
72      }
73  
74      public TagHandler createTagHandler(String ns, String localName, TagConfig tag) throws FacesException
75      {
76          return null;
77      }
78  
79      public boolean containsFunction(String ns, String name)
80      {
81          if (Namespace.equals(ns))
82          {
83              return this.fns.containsKey(name);
84          }
85          
86          return false;
87      }
88  
89      public Method createFunction(String ns, String name)
90      {
91          if (Namespace.equals(ns))
92          {
93              return (Method) this.fns.get(name);
94          }
95          
96          return null;
97      }
98  }