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  [] instanceCache;
27  
28      /** Creates a new instance of Cache */
29      public Cache(int size) {
30          instanceCache = new Object  [size];
31      }
32  
33      public void put(Object   instance) {
34          Object   ce = instance;
35          for (int i = 0, j = 0; i < instanceCache.length; i++) {
36              Object   temp = null;
37              while (j < instanceCache.length) {
38                  Object   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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