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add methods

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Looly
2020-05-19 17:31:15 +08:00
parent 0dde5ce4bc
commit 008855fafb
2 changed files with 43 additions and 2 deletions
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44
hutool-core/src/main/java/cn/hutool/core/collection/IterUtil.java
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@@ -467,6 +467,7 @@ public class IterUtil {
* @param <K> 键类型
* @param <V> 值类型
* @return HashMap
* @since 5.3.6
*/
public static <K, V> Map<K, List<V>> toListMap(Iterable<V> iterable, Function<V, K> keyMapper) {
return toListMap(iterable, keyMapper, v -> v);
@@ -482,10 +483,29 @@ public class IterUtil {
* @param <K> 键类型
* @param <V> 值类型
* @return HashMap
* @since 5.3.6
*/
public static <T, K, V> Map<K, List<V>> toListMap(Iterable<T> iterable, Function<T, K> keyMapper, Function<T, V> valueMapper) {
final HashMap<K, List<V>> resultMap = MapUtil.newHashMap();
return toListMap(MapUtil.newHashMap(), iterable, keyMapper, valueMapper);
}
/**
* 将列表转成值为List的HashMap
*
* @param resultMap 结果Map，可自定义结果Map类型
* @param iterable 值列表
* @param keyMapper Map的键映射
* @param valueMapper Map中List的值映射
* @param <T> 列表值类型
* @param <K> 键类型
* @param <V> 值类型
* @return HashMap
* @since 5.3.6
*/
public static <T, K, V> Map<K, List<V>> toListMap(Map<K, List<V>> resultMap, Iterable<T> iterable, Function<T, K> keyMapper, Function<T, V> valueMapper) {
if (null == resultMap) {
resultMap = MapUtil.newHashMap();
}
if (ObjectUtil.isNull(iterable)) {
return resultMap;
}
@@ -505,6 +525,7 @@ public class IterUtil {
* @param <K> 键类型
* @param <V> 值类型
* @return HashMap
* @since 5.3.6
*/
public static <K, V> Map<K, V> toMap(Iterable<V> iterable, Function<V, K> keyMapper) {
return toMap(iterable, keyMapper, v -> v);
@@ -520,10 +541,29 @@ public class IterUtil {
* @param <K> 键类型
* @param <V> 值类型
* @return HashMap
* @since 5.3.6
*/
public static <T, K, V> Map<K, V> toMap(Iterable<T> iterable, Function<T, K> keyMapper, Function<T, V> valueMapper) {
final HashMap<K, V> resultMap = MapUtil.newHashMap();
return toMap(MapUtil.newHashMap(), iterable, keyMapper, valueMapper);
}
/**
* 将列表转成Map
*
* @param resultMap 结果Map，通过传入map对象决定结果的Map类型
* @param iterable 值列表
* @param keyMapper Map的键映射
* @param valueMapper Map的值映射
* @param <T> 列表值类型
* @param <K> 键类型
* @param <V> 值类型
* @return HashMap
* @since 5.3.6
*/
public static <T, K, V> Map<K, V> toMap(Map<K, V> resultMap, Iterable<T> iterable, Function<T, K> keyMapper, Function<T, V> valueMapper) {
if (null == resultMap) {
resultMap = MapUtil.newHashMap();
}
if (ObjectUtil.isNull(iterable)) {
return resultMap;
}