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Java > Open Source Codes > com > caucho > naming > MemoryModel


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.naming;
30
31 import javax.naming.NamingException JavaDoc;
32 import java.util.ArrayList JavaDoc;
33 import java.util.HashMap JavaDoc;
34 import java.util.List JavaDoc;
35
36 /**
37  * Memory based model for JNDI.
38  */
39 public class MemoryModel extends AbstractModel {
40   private HashMap JavaDoc<String JavaDoc,Object JavaDoc> _children =
41   new HashMap JavaDoc<String JavaDoc,Object JavaDoc>(8);
42
43   /**
44    * Creates a new instance of the memory model.
45    */
46   public MemoryModel()
47   {
48   }
49
50   /**
51    * Creates a new instance of MemoryModel.
52    */
53   protected AbstractModel create()
54   {
55     return new MemoryModel();
56   }
57
58   /**
59    * Returns the object from looking up a single link.
60    *
61    * @param name the name segment.
62    *
63    * @return the object stored in the map.
64    */
65   public Object JavaDoc lookup(String JavaDoc name)
66     throws NamingException JavaDoc
67   {
68     return _children.get(name);
69   }
70
71   /**
72    * Rebinds an object as a child to the model.
73    */
74   public void bind(String JavaDoc name, Object JavaDoc obj)
75     throws NamingException JavaDoc
76   {
77     _children.put(name, obj);
78   }
79
80   /**
81    * Unbinds an object as a child to the model.
82    */
83   public void unbind(String JavaDoc name)
84     throws NamingException JavaDoc
85   {
86     _children.remove(name);
87   }
88
89   /**
90    * Creates a subcontext.
91    */
92   public AbstractModel createSubcontext(String JavaDoc name)
93     throws NamingException JavaDoc
94   {
95     if (_children.get(name) != null)
96       throw new NamingException JavaDoc("can't create subcontext: " + name + " " + _children.get(name));
97
98     MemoryModel model = new MemoryModel();
99     
100     _children.put(name, model);
101
102     return model;
103   }
104
105   /**
106    * Lists the child names.
107    */
108   public List JavaDoc list()
109   {
110     return new ArrayList JavaDoc(_children.keySet());
111   }
112 }
113
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