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.el;
20
21 import java.lang.reflect.Method;
22
23 import javax.el.FunctionMapper;
24
25 /**
26 * Composite FunctionMapper that attempts to load the Method from the first FunctionMapper, then the second if
27 * <code>null</code>.
28 *
29 * @see javax.el.FunctionMapper
30 * @see java.lang.reflect.Method
31 *
32 * @author Jacob Hookom
33 * @version $Id$
34 */
35 public final class CompositeFunctionMapper extends FunctionMapper
36 {
37
38 private final FunctionMapper fn0;
39
40 private final FunctionMapper fn1;
41
42 public CompositeFunctionMapper(FunctionMapper fn0, FunctionMapper fn1)
43 {
44 this.fn0 = fn0;
45 this.fn1 = fn1; // this one can be null
46 }
47
48 /**
49 * @see javax.el.FunctionMapper#resolveFunction(java.lang.String, java.lang.String)
50 */
51 public Method resolveFunction(String prefix, String name)
52 {
53 Method m = this.fn0.resolveFunction(prefix, name);
54 if (m == null && this.fn1 != null)
55 {
56 return this.fn1.resolveFunction(prefix, name);
57 }
58 return m;
59 }
60
61 }