com.mysql.jdbc.util.LRUCache Maven / Gradle / Ivy

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MySQL JDBC Type 4 driver

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/*
  Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  , like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FOSS License Exception
  .

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA

 */

package com.mysql.jdbc.util;

import java.util.LinkedHashMap;
import java.util.Map.Entry;

public class LRUCache extends LinkedHashMap {
    private static final long serialVersionUID = 1L;
    protected int maxElements;

    public LRUCache(int maxSize) {
        super(maxSize, 0.75F, true);
        this.maxElements = maxSize;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.util.LinkedHashMap#removeEldestEntry(java.util.Map.Entry)
     */
    @Override
    protected boolean removeEldestEntry(Entry eldest) {
        return (size() > this.maxElements);
    }
}