KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > caucho > config > ConfigELContext


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.config;
31
32 import com.caucho.el.EnvironmentELResolver;
33 import com.caucho.el.MapVariableResolver;
34 import com.caucho.el.StackELResolver;
35 import com.caucho.el.SystemPropertiesResolver;
36
37 import javax.el.*;
38 import java.util.Map JavaDoc;
39
40 /**
41  * Creates a variable resolver based on the classloader.
42  */
43 public class ConfigELContext extends ELContext {
44   private final StackELResolver _stackResolver = new StackELResolver();
45   private final ELResolver _varResolver;
46   
47   /**
48    * Creates the resolver
49    */
50   public ConfigELContext()
51   {
52     this(new MapVariableResolver());
53   }
54   
55   /**
56    * Creates the resolver
57    */
58   public ConfigELContext(Map JavaDoc<String JavaDoc,Object JavaDoc> map)
59   {
60     this(new MapVariableResolver(map));
61   }
62   
63   /**
64    * Creates the resolver
65    */
66   public ConfigELContext(ELResolver varResolver)
67   {
68     _varResolver = varResolver;
69
70     _stackResolver.push(new BeanELResolver());
71     _stackResolver.push(new ArrayELResolver());
72     _stackResolver.push(new MapELResolver());
73     _stackResolver.push(new ListELResolver());
74     
75     _stackResolver.push(new SystemPropertiesResolver());
76     _stackResolver.push(EnvironmentELResolver.create());
77
78     if (varResolver != null)
79       _stackResolver.push(varResolver);
80   }
81
82   public void push(ELResolver elResolver)
83   {
84     _stackResolver.push(elResolver);
85   }
86
87   public ELResolver pop()
88   {
89     return _stackResolver.pop();
90   }
91
92   public ELResolver getVariableResolver()
93   {
94     return _varResolver;
95   }
96
97   public Object JavaDoc getValue(String JavaDoc var)
98   {
99     if (_varResolver != null)
100       return _varResolver.getValue(this, null, var);
101     else
102       return null;
103   }
104
105   public void setValue(String JavaDoc var, Object JavaDoc value)
106   {
107     if (_varResolver != null)
108       _varResolver.setValue(this, null, var, value);
109   }
110
111   @Override JavaDoc
112   public ELResolver getELResolver()
113   {
114     return _stackResolver;
115   }
116
117   @Override JavaDoc
118   public FunctionMapper getFunctionMapper()
119   {
120     return null;
121   }
122
123   @Override JavaDoc
124   public VariableMapper getVariableMapper()
125   {
126     return null;
127   }
128
129   public String JavaDoc toString()
130   {
131     return "ConfigELContext[]";
132   }
133 }
134
Popular Tags