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Added a factory implementation for BitFields. Will save a bit of memory.

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Patch to change all fields to use the factory comming soon.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353776 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jason Height 2005-09-02 03:27:43 +00:00
parent c436edb4d4
commit c51554457f
1 changed files with 43 additions and 0 deletions
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src/java/org/apache/poi/util/BitFieldFactory.java Executable file
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/* ====================================================================
Copyright 2002-2004 Apache Software Foundation
Licensed 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.
==================================================================== */
package org.apache.poi.util;
import java.util.*;
/**
* Returns immutable Btfield instances.
*
* @author Jason Height (jheight at apache dot org)
*/
public class BitFieldFactory
{
private static Map instances = new HashMap();
public static BitField getInstance(final int mask) {
BitField f = (BitField)instances.get(new Integer(mask));
if (f == null) {
f = new BitField(mask);
instances.put(new Integer(mask), f);
}
return f;
}
} // end public class BitFieldFactory