io.joj.fluence.guava

Class GuavaCollectors

java.lang.Object

io.joj.fluence.guava.GuavaCollectors

public class GuavaCollectors
extends Object

Collector-s for Guava types.

Since:

Oct 24, 2016

Author:

findepi

Constructor Summary

Constructors

Constructor and Description
GuavaCollectors()

Method Summary

Modifier and Type	Method and Description
static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableList<T>>	toImmutableList() Returns a Collector that accumulates the input elements into an ImmutableList, preserving the order.
static <T,K,V> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableMap<K,V>>	toImmutableMap(java.util.function.Function<? super T,? extends K> keyMapper, java.util.function.Function<? super T,? extends V> valueMapper) Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements.

Methods inherited from class java.lang.Object

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

Constructor Detail

GuavaCollectors

public GuavaCollectors()

Method Detail

toImmutableList

public static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableList<T>> toImmutableList()

Returns a Collector that accumulates the input elements into an ImmutableList, preserving the order.

This works similar to Collectors.toList() except that return value is guaranteed to be immutable and the return type proves that.

Type Parameters:

T - the type of the input elements

toImmutableMap

public static <T,K,V> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableMap<K,V>> toImmutableMap(java.util.function.Function<? super T,? extends K> keyMapper,
                                                                                                                 java.util.function.Function<? super T,? extends V> valueMapper)

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

This works similar to Collectors.toMap(Function, Function) except that return value is guaranteed to be immutable and the return type proves that.

Type Parameters:

T - the type of the input elements

K - the type of the keys in the produced map

V - the type of the values in the produced map