01: /* ====================================================================
02: Licensed to the Apache Software Foundation (ASF) under one or more
03: contributor license agreements. See the NOTICE file distributed with
04: this work for additional information regarding copyright ownership.
05: The ASF licenses this file to You under the Apache License, Version 2.0
06: (the "License"); you may not use this file except in compliance with
07: the License. You may obtain a copy of the License at
08:
09: http://www.apache.org/licenses/LICENSE-2.0
10:
11: Unless required by applicable law or agreed to in writing, software
12: distributed under the License is distributed on an "AS IS" BASIS,
13: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: See the License for the specific language governing permissions and
15: limitations under the License.
16: ==================================================================== */
17:
18: package org.apache.poi.util;
19:
20: import java.util.*;
21:
22: /**
23: * Returns immutable Btfield instances.
24: *
25: * @author Jason Height (jheight at apache dot org)
26: */
27:
28: public class BitFieldFactory {
29: private static Map instances = new HashMap();
30:
31: public static BitField getInstance(final int mask) {
32: BitField f = (BitField) instances.get(new Integer(mask));
33: if (f == null) {
34: f = new BitField(mask);
35: instances.put(new Integer(mask), f);
36: }
37: return f;
38: }
39:
40: } // end public class BitFieldFactory
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