/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
using System;
using System.Collections;
/* ================================================================
* About NPOI
* Author: Tony Qu
* Author's email: tonyqus (at) gmail.com
* Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
* HomePage: http://www.codeplex.com/npoi
* Contributors:
*
* ==============================================================*/
namespace NPOI.Util{
/// <summary>
/// Returns immutable Btfield instances.
/// @author Jason Height (jheight at apache dot org)
/// </summary>
public class BitFieldFactory
{
//use Hashtable to replace HashMap
private static Hashtable instances = new Hashtable();
/// <summary>
/// Gets the instance.
/// </summary>
/// <param name="mask">The mask.</param>
/// <returns></returns>
public static BitField GetInstance(int mask)
{
BitField f = (BitField)instances[mask];
if (f == null)
{
f = new BitField(mask);
instances[mask] = f;
}
return f;
}
}
}
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