CompositeFunctionMapper


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.el;
16  
17  import java.lang.reflect.Method  ;
18  
19  import javax.el.FunctionMapper;
20  
21  /**
22   * Composite FunctionMapper that attempts to load the Method from the first
23   * FunctionMapper, then the second if <code>null</code>.
24   * 
25   * @see javax.el.FunctionMapper
26   * @see java.lang.reflect.Method
27   * 
28   * @author Jacob Hookom
29   * @version $Id: CompositeFunctionMapper.java,v 1.2 2005/08/24 04:38:56 jhook Exp $
30   */
31  public final class CompositeFunctionMapper extends FunctionMapper {
32  
33      private final FunctionMapper fn0;
34  
35      private final FunctionMapper fn1;
36  
37      public CompositeFunctionMapper(FunctionMapper fn0, FunctionMapper fn1) {
38          this.fn0 = fn0;
39          this.fn1 = fn1;
40      }
41  
42      /**
43       * @see javax.el.FunctionMapper#resolveFunction(java.lang.String, java.lang.String)
44       */
45      public Method   resolveFunction(String   prefix, String   name) {
46          Method   m = this.fn0.resolveFunction(prefix, name);
47          if (m == null) {
48              return this.fn1.resolveFunction(prefix, name);
49          }
50          return m;
51      }
52  
53  }
54
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