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Java > Open Source Codes > org > jpublish > cache > HashMapCacheStorage


1 /*--
2
3  Copyright (C) 2001-2003 Aetrion LLC.
4  All rights reserved.
5  
6  Redistribution and use in source and binary forms, with or without
7  modification, are permitted provided that the following conditions
8  are met:
9  
10  1. Redistributions of source code must retain the above copyright
11     notice, this list of conditions, and the following disclaimer.
12  
13  2. Redistributions in binary form must reproduce the above copyright
14     notice, this list of conditions, and the disclaimer that follows
15     these conditions in the documentation and/or other materials
16     provided with the distribution.
17
18  3. The name "JPublish" must not be used to endorse or promote products
19     derived from this software without prior written permission. For
20     written permission, please contact info@aetrion.com.
21  
22  4. Products derived from this software may not be called "JPublish", nor
23     may "JPublish" appear in their name, without prior written permission
24     from Aetrion LLC (info@aetrion.com).
25  
26  In addition, the authors of this software request (but do not require)
27  that you include in the end-user documentation provided with the
28  redistribution and/or in the software itself an acknowledgement equivalent
29  to the following:
30      "This product includes software developed by
31       Aetrion LLC (http://www.aetrion.com/)."
32
33  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
42  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
43  POSSIBILITY OF SUCH DAMAGE.
44
45  For more information on JPublish, please see <http://www.jpublish.org/>.
46  
47  */
48
49 package org.jpublish.cache;
50
51 import java.util.Map JavaDoc;
52 import java.util.WeakHashMap JavaDoc;
53
54 /**
55  * CacheStorage implementation which is backed by a WeakHashMap.
56  *
57  * @author Anthony Eden
58  */
59 public class HashMapCacheStorage extends AbstractCacheStorage {
60
61     private Map JavaDoc cache = new WeakHashMap JavaDoc();
62
63     /**
64      * Get the specified cached object. This method may return null if the object is not in the cache.
65      *
66      * @param key The key
67      * @return The value or null
68      */
69     public Object JavaDoc get(Object JavaDoc key) {
70         return cache.get(key);
71     }
72
73     /**
74      * Put a value into the cache store using the specified key.
75      *
76      * @param key The key
77      * @param value The value
78      */
79     public void put(Object JavaDoc key, Object JavaDoc value) {
80         cache.put(key, value);
81     }
82
83     /**
84      * Remove the value for the specified key.
85      *
86      * @param key The key
87      */
88     public void remove(Object JavaDoc key) {
89         cache.remove(key);
90     }
91
92     /**
93      * Remove all items from the cache storage.
94      */
95     public void clear() {
96         cache.clear();
97     }
98
99 }
100
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