Package net.hironico.common.utils

Class StreamUtils

java.lang.Object

net.hironico.common.utils.StreamUtils

public class StreamUtils
extends Object

JAVA 8+ happy developpers can use these super usefull streams utils to get their life easier.

Constructor Summary

Constructors

Constructor	Description
StreamUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Collector<T,?,T>	singletonCollector()	This collector assumes there is one and only one element in the stream and collect it.
static <T> Stream<T>	stream(Enumeration<T> enumeration)	Convert an Enumeration into Stream using Spliterator
static <T> T	uncheckCall(Callable<T> callable)	Unckec any checked exception that could be thrown in a stream call.

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

singletonCollector

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

This collector assumes there is one and only one element in the stream and collect it. If there is more than one element in the stream then illegal state exception is thrown. If the stream is empty then returns null. Use the returned collector as a parameter in the Stream.collect(Collector) Source : https://stackoverflow.com/questions/22694884/filter-java-stream-to-1-and-only-1-element/50514439

Type Parameters:

T - the single element class in this stream

Returns:

the instance of the single element in the stream.

uncheckCall

public static <T> T uncheckCall(Callable<T> callable)

Unckec any checked exception that could be thrown in a stream call. See https://stackoverflow.com/questions/19757300/java-8-lambda-streams-filter-by-method-with-exception DO NOT USE WITHOUT ALERTING EVERY SINGLE PROGRAMMER IN THE POJECT OF THIS CODE !

Type Parameters:

T -

Parameters:

callable -

Returns:

stream

public static <T> Stream<T> stream(Enumeration<T> enumeration)

Convert an Enumeration into Stream using Spliterator

Type Parameters:

T - the type of the enumeration elements

Parameters:

enumeration - to convert into Stream

Returns:

a Stream containing the enumeration's elements of type T