Package org.ametys.core.util

Class LambdaUtils.Collectors

java.lang.Object

org.ametys.core.util.LambdaUtils.Collectors

Enclosing class:

LambdaUtils

public static class LambdaUtils.Collectors
extends Object

Some useful collectors

Constructor Summary

Constructors

Constructor	Description
Collectors()

Method Summary

Modifier and Type	Method	Description
private static <T> BinaryOperator<T>	_throwingMerger()
static <T,K,U> Collector<T,?,Map<K,U>>	toLinkedHashMap(Function<? super T,? extends K> keyMapper, Function<? super T,? extends U> valueMapper)	Returns a Collector that accumulates elements into a LinkedHashMap whose keys and values are the result of applying the provided mapping functions to the input elements.
static <T,R> Collector<T,List<T>,R>	withListAccumulation(Function<List<T>,R> finisher)	A convenient method for creating a Collector which accumulates elements into a List, this list being transformed by the provided finisher into the final result.

Methods inherited from class java.lang.Object

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

Constructor Detail

Collectors

public Collectors()

Method Detail

toLinkedHashMap

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

Returns a Collector that accumulates elements into a LinkedHashMap whose keys and values are the result of applying the provided mapping functions to the input elements.

This is the same as Collectors.toMap(Function, Function), but elements are collected into a LinkedHashMap instead of a HashMap

Type Parameters:

T - the type of the input elements

K - the output type of the key mapping function

U - the output type of the value mapping function

Parameters:

keyMapper - a mapping function to produce keys

valueMapper - a mapping function to produce values

Returns:

a Collector which collects elements into a LinkedHashMap whose keys and values are the result of applying mapping functions to the input elements

_throwingMerger

private static <T> BinaryOperator<T> _throwingMerger()

withListAccumulation

public static <T,R> Collector<T,List<T>,R> withListAccumulation(Function<List<T>,R> finisher)

A convenient method for creating a Collector which accumulates elements into a List, this list being transformed by the provided finisher into the final result.

Type Parameters:

T - the type of the input elements

R - the final result type

Parameters:

finisher - The finisher function for the new collector

Returns:

the new collector