Package io.github.torand.javacommons.stream

Class StreamHelper

java.lang.Object

io.github.torand.javacommons.stream.StreamHelper

public final class StreamHelper
extends Object

Helper functions for streams

Method Summary

Modifier and Type	Method	Description
static <T> Stream<T>	concatAndStream(Iterable<T> first, Iterable<T> second)	Creates a concatenated stream from the elements in the specified iterables.
static <T> Stream<T>	concatStreams(Stream<T>... streams)	Concatenates an arbitrary number of streams.
static <T> Stream<T>	streamSafely(Iterable<T> iterable)	Creates a stream from the elements in the specified iterable.
static <T> Stream<T>	streamSafely(Iterator<T> iterator)	Creates a stream from the elements in the specified iterator.
static <T> Stream<T>	streamSafely(T... items)	Creates a stream from the elements in the specified array.
static <T> Collector<T,?,List<T>>	toReversedList()	Returns a Collector producing a list with elements in reversed order.

Methods inherited from class java.lang.Object

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

Method Details

streamSafely

public static <T> Stream<T> streamSafely(Iterable<T> iterable)

Creates a stream from the elements in the specified iterable. If the iterable is null or contains no elements, an empty stream is returned.

Type Parameters:

T - the element type.

Parameters:

iterable - the iterable.

Returns:

the stream.

streamSafely

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

Creates a stream from the elements in the specified iterator. If the iterator is null or contains no elements, an empty stream is returned.

Type Parameters:

T - the element type.

Parameters:

iterator - the iterator.

Returns:

the stream.

streamSafely

@SafeVarargs
public static <T> Stream<T> streamSafely(T... items)

Creates a stream from the elements in the specified array. If the array is null or contains no elements, an empty stream is returned.

Type Parameters:

T - the item type.

Parameters:

items - the items.

Returns:

the stream.

concatAndStream

public static <T> Stream<T> concatAndStream(Iterable<T> first,
 Iterable<T> second)

Creates a concatenated stream from the elements in the specified iterables.

Type Parameters:

T - the element type.

Parameters:

first - the first iterable.

second - the second iterable.

Returns:

the stream.

concatStreams

public static <T> Stream<T> concatStreams(Stream<T>... streams)

Concatenates an arbitrary number of streams.

Type Parameters:

T - the stream value type.

Parameters:

streams - the streams to concatenate.

Returns:

the concatenates streams.

toReversedList

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

Returns a Collector producing a list with elements in reversed order.

Type Parameters:

T - the value type.

Returns:

the Collector object.