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MapUtil增加partition方法

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This commit is contained in:
Looly 2024-02-07 11:24:44 +08:00
parent 56e7b1d5c6
commit 44580782f1
2 changed files with 32 additions and 32 deletions
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3
CHANGELOG.md
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@ -2,10 +2,11 @@
# 🚀Changelog
-------------------------------------------------------------------------------------------------------------
# 5.8.26(2024-02-03)
# 5.8.26(2024-02-07)
### 🐣新特性
* 【db 】 RedisDS增加user支持（issue#I8XEQ4@Gitee）
* 【core 】 MapUtil增加partition方法（pr#1170@Gitee）
### 🐞Bug修复
* 【crypto】 修复BouncyCastleProvider导致graalvm应用报错UnsupportedFeatureError（pr#3464@Github）

61
hutool-core/src/main/java/cn/hutool/core/map/MapUtil.java
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@ -3,10 +3,7 @@ package cn.hutool.core.map;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.lang.Editor;
import cn.hutool.core.lang.Filter;
import cn.hutool.core.lang.Pair;
import cn.hutool.core.lang.TypeReference;
import cn.hutool.core.lang.*;
import cn.hutool.core.stream.CollectorUtil;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.JdkUtil;
@ -674,7 +671,7 @@ public class MapUtil {
}
// issue#3162@Github，在构造中put值，会导致新建map带有值内容，此处清空
if(false == map2.isEmpty()){
if (false == map2.isEmpty()) {
map2.clear();
}
@ -755,7 +752,7 @@ public class MapUtil {
}
// issue#3162@Github，在构造中put值，会导致新建map带有值内容，此处清空
if(false == map2.isEmpty()){
if (false == map2.isEmpty()) {
map2.clear();
}
@ -1490,7 +1487,7 @@ public class MapUtil {
* This class should be removed once we drop Java 8 support.
*
* <p>
* 注意此方法只能用于JDK8
* 注意此方法只能用于JDK8
* </p>
*
* @param <K> 键类型
@ -1506,7 +1503,7 @@ public class MapUtil {
if (null == value) {
value = mappingFunction.apply(key);
final V res = map.putIfAbsent(key, value);
if(null != res){
if (null != res) {
// issues#I6RVMY
// 如果旧值存在，说明其他线程已经赋值成功，putIfAbsent没有执行，返回旧值
return res;
@ -1521,28 +1518,30 @@ public class MapUtil {
}
/**
* 将一个Map按照固定大小拆分成多个子Map
*
* @param map Map
* @param size 子Map的大小
* @return 子Map列表
*/
* 将一个Map按照固定大小拆分成多个子Map
*
* @param <K> 键类型
* @param <V> 值类型
* @param map Map
* @param size 子Map的大小
* @return 子Map列表
* @since 5.8.26
*/
public static <K, V> List<Map<K, V>> partition(Map<K, V> map, int size) {
if (map == null) {
throw new NullPointerException("Map must not be null");
} else if (size <= 0) {
throw new IllegalArgumentException("Size must be greater than 0");
}
List<Map<K, V>> list = new ArrayList<>();
Iterator<Map.Entry<K, V>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map<K, V> subMap = new HashMap<>(size);
for (int i = 0; i < size && iterator.hasNext(); i++) {
Map.Entry<K, V> entry = iterator.next();
subMap.put(entry.getKey(), entry.getValue());
}
list.add(subMap);
}
return list;
}
Assert.notNull(map);
if (size <= 0) {
throw new IllegalArgumentException("Size must be greater than 0");
}
List<Map<K, V>> list = new ArrayList<>();
Iterator<Map.Entry<K, V>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map<K, V> subMap = new HashMap<>(size);
for (int i = 0; i < size && iterator.hasNext(); i++) {
Map.Entry<K, V> entry = iterator.next();
subMap.put(entry.getKey(), entry.getValue());
}
list.add(subMap);
}
return list;
}
}