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.el.convert;
20
21 import javax.el.ELException;
22 import javax.el.ELResolver;
23 import javax.el.PropertyNotFoundException;
24 import javax.faces.context.FacesContext;
25 import javax.faces.el.EvaluationException;
26 import javax.faces.el.VariableResolver;
27
28 /**
29 * Provides ELResolver wrapper so that legacy apps which rely on a VariableResolver can still work.
30 *
31 * @author Stan Silvert
32 */
33 public final class ELResolverToVariableResolver extends VariableResolver
34 {
35
36 private final ELResolver elResolver;
37
38 /**
39 * Creates a new instance of ELResolverToVariableResolver
40 */
41 public ELResolverToVariableResolver(final ELResolver elResolver)
42 {
43 if (elResolver == null)
44 {
45 throw new NullPointerException();
46 }
47 this.elResolver = elResolver;
48 }
49
50 @Override
51 public Object resolveVariable(final FacesContext facesContext, final String name) throws EvaluationException
52 {
53
54 try
55 {
56 return elResolver.getValue(facesContext.getELContext(), null, name);
57 }
58 catch (PropertyNotFoundException e)
59 {
60 throw new EvaluationException(e);
61 }
62 catch (ELException e)
63 {
64 throw new EvaluationException(e);
65 }
66 }
67
68 }