EnvironmentVariableResolver


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   *
23   *   Free Software Foundation, Inc.
24   *   59 Temple Place, Suite 330
25   *   Boston, MA 02111-1307  USA
26   *
27   * @author Scott Ferguson
28   */
29  
30  package com.caucho.el;
31  
32  import com.caucho.loader.EnvironmentMap;
33  
34  import javax.el.ELContext;
35  import javax.el.ELResolver;
36  
37  /**
38   * Creates a variable resolver based on the classloader.
39   */
40  public class EnvironmentVariableResolver extends AbstractVariableResolver {
41    private static EnvironmentMap _map = new EnvironmentMap();
42    
43    /**
44     * Creates the resolver
45     */
46    public EnvironmentVariableResolver()
47    {
48    }
49    
50    /**
51     * Creates the resolver
52     */
53    public EnvironmentVariableResolver(ELResolver next)
54    {
55    }
56    
57    /**
58     * Returns the named variable value.
59     */
60    public Object   getValue(ELContext context, Object   base, Object   property)
61    {
62      String   var = (String  ) base;
63      
64      Object   value = _map.get(var);
65      
66      if (value != null)
67        return value;
68      else
69        return super.getValue(context, base, property);
70    }
71    
72    /**
73     * Sets the value for the named variable.
74     */
75    public void setValue(ELContext context,
76                 Object   base,
77                 Object   property,
78                 Object   value)
79    {
80      _map.put((String  ) base, value);
81    }
82  }
83
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