Package com.github.phantomthief.util

Class MoreCollectors

java.lang.Object

com.github.phantomthief.util.MoreCollectors

public final class MoreCollectors
extends Object

Author:

w.vela

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MoreCollectors.CollectorImpl<T,A,R>	Simple implementation class for Collector.

Field Summary

Fields

Modifier and Type	Field	Description
static Set<Collector.Characteristics>	CH_ID
static Set<Collector.Characteristics>	CH_NOID

Method Summary

Modifier and Type	Method	Description
static <T> Collector<T,?,Stream<T>>	concat(Stream<? extends T> other)
static <T> Collector<T,?,Stream<T>>	concat(T element)
static <T,K> Collector<T,?,Map<K,List<T>>>	groupingByAllowNullKey(Function<? super T,? extends K> classifier)
static <T,K,D,A,M extends Map<K,D>> Collector<T,?,M>	groupingByAllowNullKey(Function<? super T,? extends K> classifier, Supplier<M> mapFactory, Collector<? super T,A,D> downstream)	allow null key for mapFactory, nothing else changes
static <T,K,A,D> Collector<T,?,Map<K,D>>	groupingByAllowNullKey(Function<? super T,? extends K> classifier, Collector<? super T,A,D> downstream)
static <T> BinaryOperator<T>	throwingMerger()
static Collector<Integer,?,com.carrotsearch.hppc.IntArrayList>	toIntList()
static <T,K,U> Collector<T,com.carrotsearch.hppc.IntObjectHashMap<U>,com.carrotsearch.hppc.IntObjectHashMap<U>>	toIntMap(ToIntFunction<? super T> keyMapper, Function<? super T,? extends U> valueMapper)
static Collector<Integer,?,com.carrotsearch.hppc.IntHashSet>	toIntSet()
static Collector<Long,?,com.carrotsearch.hppc.LongArrayList>	toLongList()
static Collector<Long,?,com.carrotsearch.hppc.LongHashSet>	toLongSet()
static <K,V> Collector<Map.Entry<K,V>,?,Map<K,V>>	toMap()
static <T,K,U,R extends Map<K,U>> Collector<T,?,R>	toMap(Function<? super T,? extends K> keyMapper, Function<? super T,? extends U> valueMapper, Supplier<R> supplier)
static <T,K,U,M extends com.google.common.collect.Multimap<K,U>> Collector<T,?,M>	toMultimap(Function<? super T,? extends K> keyMapper, Function<? super T,? extends U> valueMapper, Supplier<M> supplier)	Deprecated.
static <T,K> Collector<T,?,com.google.common.collect.HashMultiset<K>>	toMultiset(Function<? super T,? extends K> elementMapper, ToIntFunction<? super T> countMapper)	Deprecated.

Methods inherited from class java.lang.Object

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

Field Detail

CH_ID

public static final Set<Collector.Characteristics> CH_ID

CH_NOID

public static final Set<Collector.Characteristics> CH_NOID

Method Detail

toIntList

public static Collector<Integer,?,com.carrotsearch.hppc.IntArrayList> toIntList()

toLongList

public static Collector<Long,?,com.carrotsearch.hppc.LongArrayList> toLongList()

toIntSet

public static Collector<Integer,?,com.carrotsearch.hppc.IntHashSet> toIntSet()

toLongSet

public static Collector<Long,?,com.carrotsearch.hppc.LongHashSet> toLongSet()

toIntMap

public static <T,K,U> Collector<T,com.carrotsearch.hppc.IntObjectHashMap<U>,com.carrotsearch.hppc.IntObjectHashMap<U>> toIntMap(ToIntFunction<? super T> keyMapper,
                                                                                                                                                        Function<? super T,? extends U> valueMapper)

toMap

public static <K,V> Collector<Map.Entry<K,V>,?,Map<K,V>> toMap()

toMultiset

@Deprecated
public static <T,K> Collector<T,?,com.google.common.collect.HashMultiset<K>> toMultiset(Function<? super T,? extends K> elementMapper,
                                                                                                          ToIntFunction<? super T> countMapper)

Deprecated.

toMultimap

@Deprecated
public static <T,K,U,M extends com.google.common.collect.Multimap<K,U>> Collector<T,?,M> toMultimap(Function<? super T,? extends K> keyMapper,
                                                                                                                                        Function<? super T,? extends U> valueMapper,
                                                                                                                                        Supplier<M> supplier)

Deprecated.

use Multimaps.toMultimap(Function, Function, Supplier) if using guava 21.0+

toMap

public static <T,K,U,R extends Map<K,U>> Collector<T,?,R> toMap(Function<? super T,? extends K> keyMapper,
                                                                                                    Function<? super T,? extends U> valueMapper,
                                                                                                    Supplier<R> supplier)

groupingByAllowNullKey

public static <T,K> Collector<T,?,Map<K,List<T>>> groupingByAllowNullKey(Function<? super T,? extends K> classifier)

groupingByAllowNullKey

public static <T,K,A,D> Collector<T,?,Map<K,D>> groupingByAllowNullKey(Function<? super T,? extends K> classifier,
                                                                                                           Collector<? super T,A,D> downstream)

groupingByAllowNullKey

public static <T,K,D,A,M extends Map<K,D>> Collector<T,?,M> groupingByAllowNullKey(Function<? super T,? extends K> classifier,
                                                                                                                             Supplier<M> mapFactory,
                                                                                                                             Collector<? super T,A,D> downstream)

allow null key for mapFactory, nothing else changes

throwingMerger

public static <T> BinaryOperator<T> throwingMerger()

concat

public static <T> Collector<T,?,Stream<T>> concat(Stream<? extends T> other)

concat

public static <T> Collector<T,?,Stream<T>> concat(T element)