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Java > Open Source Codes > org > netbeans > modules > javacore > Cache


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.modules.javacore;
20
21 /**
22  *
23  * @author Martin Matula
24  */
25 public class Cache {
26     private final Object JavaDoc[] instanceCache;
27
28     /** Creates a new instance of Cache */
29     public Cache(int size) {
30         instanceCache = new Object JavaDoc[size];
31     }
32
33     public void put(Object JavaDoc instance) {
34         Object JavaDoc ce = instance;
35         for (int i = 0, j = 0; i < instanceCache.length; i++) {
36             Object JavaDoc temp = null;
37             while (j < instanceCache.length) {
38                 Object JavaDoc tmp2 = instanceCache[j];
39                 j++;
40                 if (tmp2 != null && tmp2 != instance) {
41                     if (!(tmp2 instanceof CachedElement) || ((CachedElement) tmp2).isValid()) {
42                         temp = tmp2;
43                         break;
44                     } else {
45                         ((CachedElement) tmp2).release();
46                     }
47                 }
48             }
49             instanceCache[i] = ce;
50             ce = temp;
51         }
52         if (ce != null && (ce instanceof CachedElement)) {
53             ((CachedElement) ce).release();
54         }
55     }
56     
57     public void dump() {
58         System.err.println("******** Cache dump:");
59         for (int i = 0; i < instanceCache.length; i++) {
60             System.err.println(instanceCache[i].toString());
61         }
62         System.err.println("*********");
63     }
64     
65     public interface CachedElement {
66         void release();
67         boolean isValid();
68     }
69 }
70
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