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add method

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This commit is contained in:
Looly 2021-12-22 00:28:29 +08:00
parent 1279f9f6ab
commit 6eb5a76f80
3 changed files with 64 additions and 8 deletions
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1
CHANGELOG.md
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@ -13,6 +13,7 @@
* 【core 】 Img.scale缩小默认使用平滑模式，增加scale方法重载可选模式（issue#I4MY6X@Gitee）
* 【core 】 excel添加写入图片的方法（pr#486@Gitee）
* 【core 】 增加CollStreamUtil.groupBy（pr#484@Gitee）
* 【core 】 增加CollUtil.setValueByMap（pr#482@Gitee）
*
### 🐞Bug修复
* 【core 】 LineReadWatcher#onModify文件清空判断问题（issue#2013@Github）

11
hutool-core/src/main/java/cn/hutool/core/collection/CollUtil.java
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@ -2931,14 +2931,19 @@ public class CollUtil {
/**
* 使用给定的map将集合中的原素进行属性或者值的重新设定
* @param collection 集合
*
* @param <E> 元素类型
* @param <K> 替换的键
* @param <V> 替换的值
* @param iterable 集合
* @param map 映射集
* @param keyGenerate 映射键生成函数
* @param biConsumer 封装映射到的值函数
* @author nick_wys
* @since 5.7.18
*/
public static <E, K, V> void setValueByMap(Collection<E> collection, Map<K, V> map, Function<E, K> keyGenerate, BiConsumer<E, V> biConsumer) {
collection.forEach(x -> Optional.ofNullable(map.get(keyGenerate.apply(x))).ifPresent(y -> biConsumer.accept(x, y)));
public static <E, K, V> void setValueByMap(Iterable<E> iterable, Map<K, V> map, Function<E, K> keyGenerate, BiConsumer<E, V> biConsumer) {
iterable.forEach(x -> Optional.ofNullable(map.get(keyGenerate.apply(x))).ifPresent(y -> biConsumer.accept(x, y)));
}
// ---------------------------------------------------------------------------------------------- Interface start

50
hutool-core/src/test/java/cn/hutool/core/collection/CollUtilTest.java
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@ -827,4 +827,54 @@ public class CollUtilTest {
final List<String> sort = CollUtil.sort(of, new ComparableComparator<>());
Assert.assertEquals("a,b,c", CollUtil.join(sort, ","));
}
@Test
public void setValueByMapTest(){
// https://gitee.com/dromara/hutool/pulls/482
List<Person> people = Arrays.asList(
new Person("aa", 12, "man", 1),
new Person("bb", 13, "woman", 2),
new Person("cc", 14, "man", 3),
new Person("dd", 15, "woman", 4),
new Person("ee", 16, "woman", 5),
new Person("ff", 17, "man", 6)
);
Map<Integer, String> genderMap = new HashMap<>();
genderMap.put(1, null);
genderMap.put(2, "妇女");
genderMap.put(3, "少女");
genderMap.put(4, "女");
genderMap.put(5, "小孩");
genderMap.put(6, "男");
Assert.assertEquals(people.get(1).getGender(), "woman");
CollUtil.setValueByMap(people, genderMap, Person::getId, Person::setGender);
Assert.assertEquals(people.get(1).getGender(), "妇女");
Map<Integer, Person> personMap = new HashMap<>();
personMap.put(1, new Person("AA", 21, "男", 1));
personMap.put(2, new Person("BB", 7, "小孩", 2));
personMap.put(3, new Person("CC", 65, "老人", 3));
personMap.put(4, new Person("DD", 35, "女人", 4));
personMap.put(5, new Person("EE", 14, "少女", 5));
personMap.put(6, null);
CollUtil.setValueByMap(people, personMap, Person::getId, (x, y) -> {
x.setGender(y.getGender());
x.setName(y.getName());
x.setAge(y.getAge());
});
Assert.assertEquals(people.get(1).getGender(), "小孩");
}
@Data
@AllArgsConstructor
static class Person {
private String name;
private Integer age;
private String gender;
private Integer id;
}
}