Package org.openl.util

Class StreamUtils

java.lang.Object

org.openl.util.StreamUtils

public class StreamUtils
extends Object

Set of utilities for Java Streams.

Author:

Yury Molchan

Constructor Summary

Constructors

Constructor	Description
StreamUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Stream<T>	fromIterator(Iterator<T> iterator)	Transform iterator to stream.
static <T, K, U> Collector<T,?,Map<K,U>>	toLinkedMap(Function<? super T,? extends K> keyMapper, Function<? super T,? extends U> valueMapper)	To use with Java Streams to collect in in a map preserving the order of elements.
static <T> Collector<T,?,Set<T>>	toTreeSet(Comparator<? super T> comparator)	To use with Java Streams to collect in tree set with custom order

Methods inherited from class java.lang.Object

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

Constructor Details

StreamUtils

public StreamUtils()

Method Details

toLinkedMap

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

To use with Java Streams to collect in in a map preserving the order of elements.

toTreeSet

public static <T> Collector<T,?,Set<T>> toTreeSet(Comparator<? super T> comparator)

To use with Java Streams to collect in tree set with custom order

fromIterator

public static <T> Stream<T> fromIterator(Iterator<T> iterator)

Transform iterator to stream.

Type Parameters:

T - type of elements

Parameters:

iterator - iterator to transform

Returns:

stream