#if MYSQL_6_9 // Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc. // // MySQL Connector/NET 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 // FLOSS 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 using System; using System.Collections.Generic; namespace Externals.MySql.Data.Common { internal class Cache { private int _capacity; private Queue _keyQ; private Dictionary _contents; public Cache(int initialCapacity, int capacity) { _capacity = capacity; _contents = new Dictionary(initialCapacity); if (capacity > 0) _keyQ = new Queue(initialCapacity); } public ValueType this[KeyType key] { get { ValueType val; if (_contents.TryGetValue(key, out val)) return val; else return default(ValueType); } set { InternalAdd(key, value); } } public void Add(KeyType key, ValueType value) { InternalAdd(key, value); } private void InternalAdd(KeyType key, ValueType value) { if (!_contents.ContainsKey(key)) { if (_capacity > 0) { _keyQ.Enqueue(key); if (_keyQ.Count > _capacity) _contents.Remove(_keyQ.Dequeue()); } } _contents[key] = value; } } } #endif