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分流收集器收集方式从固定Collection改为自定义收集器，可以自定义如何收集元素

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Looly 2025-04-26 13:38:45 +08:00
parent 49e9ede07b
commit 3658d9f7ca
2 changed files with 63 additions and 64 deletions
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13
hutool-core/src/main/java/org/dromara/hutool/core/stream/CollectorUtil.java
View File

@ -489,7 +489,6 @@ public class CollectorUtil {
} }
/** /**
* 将一个{@code Collection<T>}两个属性分流至两个Collection,并使用Pair收集。 * 将一个{@code Collection<T>}两个属性分流至两个Collection,并使用Pair收集。
* *
@ -527,14 +526,14 @@ public class CollectorUtil {
rDownstream.combiner().apply(listPair1.getRight(), listPair2.getRight())), rDownstream.combiner().apply(listPair1.getRight(), listPair2.getRight())),
finisherPair -> { finisherPair -> {
LR finisherLeftValue; final LR finisherLeftValue;
if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) { if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) {
finisherLeftValue = (LR) finisherPair.getLeft(); finisherLeftValue = (LR) finisherPair.getLeft();
} else { } else {
finisherLeftValue = lDownstream.finisher().apply(finisherPair.getLeft()); finisherLeftValue = lDownstream.finisher().apply(finisherPair.getLeft());
} }
RR finisherRightValue; final RR finisherRightValue;
if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) { if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) {
finisherRightValue = (RR) finisherPair.getRight(); finisherRightValue = (RR) finisherPair.getRight();
} else { } else {
@ -568,7 +567,6 @@ public class CollectorUtil {
} }
/** /**
* 将一个{@code Collection<T>}两个属性分流至两个Collection,并使用Pair收集。 * 将一个{@code Collection<T>}两个属性分流至两个Collection,并使用Pair收集。
* *
@ -576,6 +574,7 @@ public class CollectorUtil {
* @param mMapper 中元素收集方法 * @param mMapper 中元素收集方法
* @param rMapper 右元素收集方法 * @param rMapper 右元素收集方法
* @param lDownstream 左元素下游操作 * @param lDownstream 左元素下游操作
* @param mDownstream 中元素下游操作
* @param rDownstream 右元素下游操作 * @param rDownstream 右元素下游操作
* @param <T> 元素类型 * @param <T> 元素类型
* @param <LU> 左属性类型 * @param <LU> 左属性类型
@ -614,21 +613,21 @@ public class CollectorUtil {
rDownstream.combiner().apply(listTriple1.getRight(), listTriple2.getRight())), rDownstream.combiner().apply(listTriple1.getRight(), listTriple2.getRight())),
finisherTriple -> { finisherTriple -> {
LR finisherLeftValue; final LR finisherLeftValue;
if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) { if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) {
finisherLeftValue = (LR) finisherTriple.getLeft(); finisherLeftValue = (LR) finisherTriple.getLeft();
} else { } else {
finisherLeftValue = lDownstream.finisher().apply(finisherTriple.getLeft()); finisherLeftValue = lDownstream.finisher().apply(finisherTriple.getLeft());
} }
MR finisherMiddleValue; final MR finisherMiddleValue;
if (mDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) { if (mDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) {
finisherMiddleValue = (MR) finisherTriple.getMiddle(); finisherMiddleValue = (MR) finisherTriple.getMiddle();
} else { } else {
finisherMiddleValue = mDownstream.finisher().apply(finisherTriple.getMiddle()); finisherMiddleValue = mDownstream.finisher().apply(finisherTriple.getMiddle());
} }
RR finisherRightValue; final RR finisherRightValue;
if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) { if (lDownstream.characteristics().contains(Collector.Characteristics.IDENTITY_FINISH)) {
finisherRightValue = (RR) finisherTriple.getRight(); finisherRightValue = (RR) finisherTriple.getRight();
} else { } else {

2
hutool-core/src/test/java/org/dromara/hutool/core/stream/CollectorUtilTest.java
View File

@ -167,7 +167,7 @@ public class CollectorUtilTest {
Assertions.assertEquals(list.size(),tripleList.getMiddle().size()); Assertions.assertEquals(list.size(),tripleList.getMiddle().size());
Assertions.assertEquals(list.size(),tripleList.getRight().size()); Assertions.assertEquals(list.size(),tripleList.getRight().size());
Triple<Integer, List<Long>, String> tripleMixed = list.stream() final Triple<Integer, List<Long>, String> tripleMixed = list.stream()
.collect(CollectorUtil.toTriple(Triple::getLeft, Triple::getMiddle, Triple::getRight, .collect(CollectorUtil.toTriple(Triple::getLeft, Triple::getMiddle, Triple::getRight,
Collectors.summingInt(s->s), Collectors.toList(), Collectors.joining())); Collectors.summingInt(s->s), Collectors.toList(), Collectors.joining()));