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Java > Open Source Codes > com > mysql > jdbc > util > LRUCache


1 /*
2  Copyright (C) 2002-2004 MySQL AB
3
4  This program is free software; you can redistribute it and/or modify
5  it under the terms of version 2 of the GNU General Public License as
6  published by the Free Software Foundation.
7
8  There are special exceptions to the terms and conditions of the GPL
9  as it is applied to this software. View the full text of the
10  exception in file EXCEPTIONS-CONNECTOR-J in the directory of this
11  software distribution.
12
13  This program is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  GNU General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with this program; if not, write to the Free Software
20  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
22
23
24  */
25 package com.mysql.jdbc.util;
26
27 import java.util.LinkedHashMap JavaDoc;
28 import java.util.Map.Entry;
29
30 /**
31  * @author Mark Matthews
32  * @version $Id: LRUCache.java,v 1.1.2.2 2005/05/19 15:52:24 mmatthews Exp $
33  */
34 public class LRUCache extends LinkedHashMap JavaDoc {
35     protected int maxElements;
36
37     public LRUCache(int maxSize) {
38         super(maxSize);
39         this.maxElements = maxSize;
40     }
41
42     /*
43      * (non-Javadoc)
44      *
45      * @see java.util.LinkedHashMap#removeEldestEntry(java.util.Map.Entry)
46      */
47     protected boolean removeEldestEntry(Entry eldest) {
48         return (size() > this.maxElements);
49     }
50 }
51
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