01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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
41: AbstractVariableResolver {
42: private static EnvironmentMap _map = new EnvironmentMap();
43:
44: /**
45: * Creates the resolver
46: */
47: public EnvironmentVariableResolver() {
48: }
49:
50: /**
51: * Creates the resolver
52: */
53: public EnvironmentVariableResolver(ELResolver next) {
54: }
55:
56: /**
57: * Returns the named variable value.
58: */
59: public Object getValue(ELContext context, Object base,
60: Object property) {
61: String var = (String) base;
62:
63: Object value = _map.get(var);
64:
65: if (value != null)
66: return value;
67: else
68: return super .getValue(context, base, property);
69: }
70:
71: /**
72: * Sets the value for the named variable.
73: */
74: public void setValue(ELContext context, Object base,
75: Object property, Object value) {
76: _map.put((String) base, value);
77: }
78: }
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