2021-01-03 23:27:19 +08:00
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package cn.iocoder.dashboard.util.collection;
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2021-01-14 01:18:56 +08:00
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import cn.hutool.core.collection.CollUtil;
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2021-01-03 23:27:19 +08:00
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import cn.hutool.core.collection.CollectionUtil;
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import com.google.common.collect.Multimap;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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2021-01-14 01:18:56 +08:00
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import java.util.Map;
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import java.util.function.Consumer;
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2021-01-03 23:27:19 +08:00
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/**
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* Map 工具类
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*
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* @author 芋道源码
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*/
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public class MapUtils {
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2021-01-14 01:18:56 +08:00
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/**
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* 从哈希表表中,获得 keys 对应的所有 value 数组
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*
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* @param multimap 哈希表
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* @param keys keys
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* @return value 数组
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*/
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2021-01-03 23:27:19 +08:00
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public static <K, V> List<V> getList(Multimap<K, V> multimap, Collection<K> keys) {
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List<V> result = new ArrayList<>();
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keys.forEach(k -> {
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Collection<V> values = multimap.get(k);
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if (CollectionUtil.isEmpty(values)) {
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return;
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}
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result.addAll(values);
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});
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return result;
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}
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2021-01-14 01:18:56 +08:00
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/**
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* 从哈希表查找到 key 对应的 value,然后进一步处理
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* 注意,如果查找到的 value 为 null 时,不进行处理
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*
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* @param map 哈希表
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* @param key key
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* @param consumer 进一步处理的逻辑
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*/
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public static <K, V> void findAndThen(Map<K, V> map, K key, Consumer<V> consumer) {
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if (CollUtil.isEmpty(map)) {
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return;
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}
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V value = map.get(key);
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if (value == null) {
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return;
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}
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consumer.accept(value);
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}
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2021-01-03 23:27:19 +08:00
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}
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