| 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; |
| 28 | import java.util.Map.Entry; |
| 29 | |
| 30 | /** |
| 31 | * @author Mark Matthews |
| 32 | * @version $Id: LRUCache.java 3726 2005-05-19 15:52:24Z mmatthews $ |
| 33 | */ |
| 34 | public class LRUCache extends LinkedHashMap { |
| 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 | } |