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Java > Open Source Codes > com > caucho > quercus > env > ChainedMap


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.quercus.env;
31
32 import java.util.HashMap JavaDoc;
33 import java.util.Map JavaDoc;
34
35 /**
36  * Represents a PHP chained map
37  */
38 public class ChainedMap<K,V> implements VarMap<K,V> {
39   private final VarMap<K,V> _next;
40
41   private final Map JavaDoc<K,V> _map;
42
43   public ChainedMap(VarMap<K,V> next, Map JavaDoc<K,V> map)
44   {
45     _next = next;
46     _map = map;
47   }
48
49   public ChainedMap(VarMap<K,V> next)
50   {
51     _next = next;
52     _map = new HashMap JavaDoc<K,V>();
53   }
54
55   /**
56    * Sets the value
57    */
58   public void put(K key, V value)
59   {
60     _map.put(key, value);
61   }
62
63   /**
64    * Remove the value
65    */
66   public V remove(K key)
67   {
68     return _map.remove(key);
69   }
70
71   /**
72    * Gets a value.
73    */
74   public V get(K key)
75   {
76     V value = _map.get(key);
77
78     if (value != null)
79       return value;
80     else if (_next != null)
81       return _next.get(key);
82     else
83       return null;
84   }
85 }
86
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