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Java > Open Source Codes > com > caucho > jsp > el > ELContextAdapter


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.jsp.el;
30
31 import com.caucho.el.AbstractVariableResolver;
32
33 import javax.el.ELContext;
34 import javax.el.ELException;
35 import javax.el.ELResolver;
36 import javax.servlet.jsp.el.VariableResolver JavaDoc;
37
38 /**
39  * Implementation of the expression evaluator.
40  */
41 public class ELContextAdapter extends ELContext {
42   private VariableResolver _resolver;
43   private ELResolver _elResolver = new ELResolverAdapter();
44
45   /**
46    * Implements the expression.
47    */
48   ELContextAdapter(VariableResolver resolver)
49   {
50     _resolver = resolver;
51   }
52   
53   public ELResolver getELResolver()
54   {
55     return _elResolver;
56   }
57
58   public javax.el.FunctionMapper getFunctionMapper()
59   {
60     return null;
61   }
62
63   public javax.el.VariableMapper getVariableMapper()
64   {
65     return null;
66   }
67
68   class ELResolverAdapter extends AbstractVariableResolver
69   {
70     @Override JavaDoc
71     public Object JavaDoc getValue(ELContext context, Object JavaDoc base, Object JavaDoc property)
72     {
73       if (base == null && property instanceof String JavaDoc) {
74     if (context != null)
75       context.setPropertyResolved(true);
76
77     try {
78       return _resolver.resolveVariable((String JavaDoc) property);
79     } catch (Exception JavaDoc e) {
80       throw new ELException(e);
81     }
82       }
83       else
84     return null;
85     }
86     
87   }
88 }
89
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