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[github-709] Make BitFieldFactory threadsafe. Thanks to ZhangChen. This closes #709

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1921332 13f79535-47bb-0310-9956-ffa450edef68
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PJ Fanning 2024-10-15 12:58:33 +00:00
parent f8bbec3104
commit ab68210d2a
1 changed files with 2 additions and 2 deletions
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poi/src/main/java/org/apache/poi/util/BitFieldFactory.java
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@ -18,13 +18,13 @@
package org.apache.poi.util;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
/**
* Returns immutable Bitfield instances.
*/
public class BitFieldFactory {
private static Map<Integer, BitField> instances = new HashMap<>();
private static final ConcurrentHashMap<Integer, BitField> instances = new ConcurrentHashMap<>();
public static BitField getInstance(int mask) {
return instances.computeIfAbsent(mask, k -> new BitField(mask));