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添加支持对流进行转换的收集器

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huangchengxing
2022-08-30 15:04:30 +08:00
parent 9e20dbb7a0
commit 4893a5e9aa
2 changed files with 107 additions and 46 deletions
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39
hutool-core/src/test/java/cn/hutool/core/stream/CollectorUtilTest.java
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@@ -4,11 +4,9 @@ import cn.hutool.core.map.MapUtil;
import org.junit.Assert;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* CollectorUtilTest
@@ -21,17 +19,36 @@ public class CollectorUtilTest {
@Test
public void reduceListMapTest() {
final Set<Map<String, Integer>> nameScoreMapList = StreamUtil.of(
// 集合内的第一个map，包含两个key value
MapUtil.builder("苏格拉底", 1).put("特拉叙马霍斯", 3).build(),
MapUtil.of("苏格拉底", 2),
MapUtil.of("特拉叙马霍斯", 1),
MapUtil.of("特拉叙马霍斯", 2)
// 集合内的第一个map，包含两个key value
MapUtil.builder("苏格拉底", 1).put("特拉叙马霍斯", 3).build(),
MapUtil.of("苏格拉底", 2),
MapUtil.of("特拉叙马霍斯", 1),
MapUtil.of("特拉叙马霍斯", 2)
).collect(Collectors.toSet());
// 执行聚合
final Map<String, List<Integer>> nameScoresMap = nameScoreMapList.stream().collect(CollectorUtil.reduceListMap());
Assert.assertEquals(MapUtil.builder("苏格拉底", Arrays.asList(1, 2))
.put("特拉叙马霍斯", Arrays.asList(3, 1, 2)).build(),
nameScoresMap);
.put("特拉叙马霍斯", Arrays.asList(3, 1, 2)).build(),
nameScoresMap);
}
@Test
public void testTransform() {
Stream<Integer> stream = Stream.of(1, 2, 3, 4)
.collect(CollectorUtil.transform(EasyStream::of));
Assert.assertEquals(EasyStream.class, stream.getClass());
stream = Stream.of(1, 2, 3, 4)
.collect(CollectorUtil.transform(HashSet::new, EasyStream::of));
Assert.assertEquals(EasyStream.class, stream.getClass());
}
@Test
public void testToEasyStream() {
Stream<Integer> stream =Stream.of(1, 2, 3, 4)
.collect(CollectorUtil.toEasyStream());
Assert.assertEquals(EasyStream.class, stream.getClass());
}
}