org.springframework.data.util

Interface StreamUtils

public interface StreamUtils

Spring Data specific Java Stream utility methods and classes.

Since:

1.10

Author:

Thomas Darimont, Oliver Gierke

Method Summary

Modifier and Type	Method and Description
static <T> Stream<T>	createStreamFromIterator(Iterator<T> iterator) Returns a Stream backed by the given Iterator.
static <T,K,V> Collector<T,MultiValueMap<K,V>,MultiValueMap<K,V>>	toMultiMap(Function<T,K> keyFunction, Function<T,V> valueFunction) Returns a Collector to create a MultiValueMap.
static <T> Collector<T,?,List<T>>	toUnmodifiableList() Returns a Collector to create an unmodifiable List.
static <T> Collector<T,?,Set<T>>	toUnmodifiableSet() Returns a Collector to create an unmodifiable Set.

Method Detail

createStreamFromIterator

static <T> Stream<T> createStreamFromIterator(Iterator<T> iterator)

Returns a Stream backed by the given Iterator.

If the given iterator is an CloseableIterator add a CloseableIteratorDisposingRunnable wrapping the given iterator to propagate BaseStream.close() accordingly.

Parameters:

iterator - must not be null

Returns:

Since:

1.8

toUnmodifiableList

static <T> Collector<T,?,List<T>> toUnmodifiableList()

Returns a Collector to create an unmodifiable List.

Returns:

will never be null.

toUnmodifiableSet

static <T> Collector<T,?,Set<T>> toUnmodifiableSet()

Returns a Collector to create an unmodifiable Set.

Returns:

will never be null.

toMultiMap

static <T,K,V> Collector<T,MultiValueMap<K,V>,MultiValueMap<K,V>> toMultiMap(Function<T,K> keyFunction,
                                                                             Function<T,V> valueFunction)

Returns a Collector to create a MultiValueMap.

Parameters:

keyFunction - Function to create a key from an element of the Stream

valueFunction - Function to create a value from an element of the Stream