Package de.cronn.commons.lang

Class StreamUtil

java.lang.Object

de.cronn.commons.lang.StreamUtil

public final class StreamUtil
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	StreamUtil.ExceptionSupplier<T>

Method Summary

Modifier and Type	Method	Description
static <T, K> Collector<T,?,Map<K,List<T>>>	groupingBy(Function<? super T,? extends K> classifier)	Drop-in replacement for Collectors.groupingBy(Function) which guarantees a deterministic order of the map
static <T> boolean	hasDuplicates(Stream<T> entries)
static <T, K> Collector<T,?,Map<K,T>>	toLinkedHashMap(Function<? super T,? extends K> keyMapper)
static <T, K, V> Collector<T,?,Map<K,V>>	toLinkedHashMap(Function<? super T,? extends K> keyMapper, Function<? super T,? extends V> valueMapper)
static <T> Collector<T,?,Set<T>>	toLinkedHashSet()
static <T> Collector<T,?,List<T>>	toModifiableList()
static <T> Collector<T,?,T>	toSingleElement()
static <T> Collector<T,?,T>	toSingleElement(StreamUtil.ExceptionSupplier<T> exceptionSupplier)
static <T> Collector<T,?,T>	toSingleElement(Supplier<RuntimeException> exceptionSupplier)
static <T> Collector<T,?,Optional<T>>	toSingleOptionalElement()
static <T> Collector<T,?,Optional<T>>	toSingleOptionalElement(StreamUtil.ExceptionSupplier<T> exceptionSupplier)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

toLinkedHashSet

public static <T> Collector<T,?,Set<T>> toLinkedHashSet()

toModifiableList

public static <T> Collector<T,?,List<T>> toModifiableList()

groupingBy

public static <T,
K> Collector<T,?,Map<K,List<T>>> groupingBy(Function<? super T,? extends K> classifier)

Drop-in replacement for Collectors.groupingBy(Function) which guarantees a deterministic order of the map

toLinkedHashMap

public static <T,
K> Collector<T,?,Map<K,T>> toLinkedHashMap(Function<? super T,? extends K> keyMapper)

toLinkedHashMap

public static <T,
K,
V> Collector<T,?,Map<K,V>> toLinkedHashMap(Function<? super T,? extends K> keyMapper,
 Function<? super T,? extends V> valueMapper)

toSingleOptionalElement

public static <T> Collector<T,?,Optional<T>> toSingleOptionalElement()

toSingleOptionalElement

public static <T> Collector<T,?,Optional<T>> toSingleOptionalElement(StreamUtil.ExceptionSupplier<T> exceptionSupplier)

toSingleElement

public static <T> Collector<T,?,T> toSingleElement()

toSingleElement

public static <T> Collector<T,?,T> toSingleElement(Supplier<RuntimeException> exceptionSupplier)

toSingleElement

public static <T> Collector<T,?,T> toSingleElement(StreamUtil.ExceptionSupplier<T> exceptionSupplier)

hasDuplicates

public static <T> boolean hasDuplicates(Stream<T> entries)