Package org.apache.tinkerpop.gremlin.util.iterator

Class IteratorUtils

java.lang.Object

org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils

public final class IteratorUtils
extends Object

Author:

Marko A. Rodriguez (http://markorodriguez.com)

Method Summary

Modifier and Type	Method	Description
static <T> boolean	allMatch(Iterator<T> iterator, Predicate<T> predicate)
static <T> boolean	anyMatch(Iterator<T> iterator, Predicate<T> predicate)
static Iterator	asIterator(Object o)
static List	asList(Object o)
static Set	asSet(Object o)
static <S,E> Iterator<E>	cast(Iterator<S> iterator)
static <K,S> Map<K,S>	collectMap(Iterator<S> iterator, Function<S,K> key)
static <K,S,V> Map<K,V>	collectMap(Iterator<S> iterator, Function<S,K> key, Function<S,V> value)
static <S> Iterator<S>	concat(Iterator<S>... iterators)
static <S> Iterable<S>	consume(Iterable<S> iterable, Consumer<S> consumer)
static <S> Iterator<S>	consume(Iterator<S> iterator, Consumer<S> consumer)
static long	count(Iterable iterable)
static long	count(Iterator iterator)
static <S extends Collection<T>,T> S	fill(Iterator<T> iterator, S collection)
static <S> Iterable<S>	filter(Iterable<S> iterable, Predicate<S> predicate)
static <S> Iterator<S>	filter(Iterator<S> iterator, Predicate<S> predicate)
static <T> Optional<T>	findFirst(Iterator<T> iterator)
static <S,E> Iterator<E>	flatMap(Iterator<S> iterator, Function<S,Iterator<E>> function)
static <K,S> Map<K,List<S>>	groupBy(Iterator<S> iterator, Function<S,K> groupBy)
static void	iterate(Iterator iterator)
static <S> Iterator<S>	limit(Iterator<S> iterator, int limit)
static <S> List<S>	list(Iterator<S> iterator)
static <S> List<S>	list(Iterator<S> iterator, Comparator comparator)
static <S,E> Iterable<E>	map(Iterable<S> iterable, Function<S,E> function)
static <S,E> Iterator<E>	map(Iterator<S> iterator, Function<S,E> function)
static <T> boolean	noneMatch(Iterator<T> iterator, Predicate<T> predicate)
static <T> Iterator<T>	noRemove(Iterator<T> iterator)
static <S> Iterator<S>	of(S a)
static <S> Iterator<S>	of(S a, S b)
static <S> Iterable<S>	peek(Iterable<S> iterable, Consumer<S> function)
static <S> Iterator<S>	peek(Iterator<S> iterator, Consumer<S> function)
static <S,E> E	reduce(Iterable<S> iterable, E identity, BiFunction<E,S,E> accumulator)
static <S> S	reduce(Iterable<S> iterable, S identity, BinaryOperator<S> accumulator)
static <S,E> E	reduce(Iterator<S> iterator, E identity, BiFunction<E,S,E> accumulator)
static <S> S	reduce(Iterator<S> iterator, S identity, BinaryOperator<S> accumulator)
static <T> Iterator<T>	removeOnNext(Iterator<T> iterator)
static <S> Set<S>	set(Iterator<S> iterator)
static <T> Stream<T>	stream(Iterable<T> iterable)
static <T> Stream<T>	stream(Iterator<T> iterator)	Construct a Stream from an Iterator.

Methods inherited from class java.lang.Object

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

Method Detail

of

public static <S> Iterator<S> of(S a)

of

public static <S> Iterator<S> of(S a,
                                 S b)

fill

public static <S extends Collection<T>,T> S fill(Iterator<T> iterator,
                                                       S collection)

iterate

public static void iterate(Iterator iterator)

count

public static long count(Iterator iterator)

count

public static final long count(Iterable iterable)

list

public static <S> List<S> list(Iterator<S> iterator)

list

public static <S> List<S> list(Iterator<S> iterator,
                               Comparator comparator)

set

public static <S> Set<S> set(Iterator<S> iterator)

limit

public static <S> Iterator<S> limit(Iterator<S> iterator,
                                    int limit)

allMatch

public static <T> boolean allMatch(Iterator<T> iterator,
                                   Predicate<T> predicate)

anyMatch

public static <T> boolean anyMatch(Iterator<T> iterator,
                                   Predicate<T> predicate)

noneMatch

public static <T> boolean noneMatch(Iterator<T> iterator,
                                    Predicate<T> predicate)

findFirst

public static <T> Optional<T> findFirst(Iterator<T> iterator)

collectMap

public static <K,S> Map<K,S> collectMap(Iterator<S> iterator,
                                                    Function<S,K> key)

collectMap

public static <K,S,V> Map<K,V> collectMap(Iterator<S> iterator,
                                                            Function<S,K> key,
                                                            Function<S,V> value)

groupBy

public static <K,S> Map<K,List<S>> groupBy(Iterator<S> iterator,
                                                       Function<S,K> groupBy)

reduce

public static <S> S reduce(Iterator<S> iterator,
                           S identity,
                           BinaryOperator<S> accumulator)

reduce

public static <S> S reduce(Iterable<S> iterable,
                           S identity,
                           BinaryOperator<S> accumulator)

reduce

public static <S,E> E reduce(Iterator<S> iterator,
                                   E identity,
                                   BiFunction<E,S,E> accumulator)

reduce

public static <S,E> E reduce(Iterable<S> iterable,
                                   E identity,
                                   BiFunction<E,S,E> accumulator)

consume

public static <S> Iterator<S> consume(Iterator<S> iterator,
                                      Consumer<S> consumer)

consume

public static <S> Iterable<S> consume(Iterable<S> iterable,
                                      Consumer<S> consumer)

map

public static <S,E> Iterator<E> map(Iterator<S> iterator,
                                          Function<S,E> function)

map

public static <S,E> Iterable<E> map(Iterable<S> iterable,
                                          Function<S,E> function)

cast

public static <S,E> Iterator<E> cast(Iterator<S> iterator)

peek

public static <S> Iterator<S> peek(Iterator<S> iterator,
                                   Consumer<S> function)

peek

public static <S> Iterable<S> peek(Iterable<S> iterable,
                                   Consumer<S> function)

filter

public static <S> Iterator<S> filter(Iterator<S> iterator,
                                     Predicate<S> predicate)

filter

public static <S> Iterable<S> filter(Iterable<S> iterable,
                                     Predicate<S> predicate)

flatMap

public static <S,E> Iterator<E> flatMap(Iterator<S> iterator,
                                              Function<S,Iterator<E>> function)

concat

public static <S> Iterator<S> concat(Iterator<S>... iterators)

asIterator

public static Iterator asIterator(Object o)

asList

public static List asList(Object o)

asSet

public static Set asSet(Object o)

stream

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

Construct a Stream from an Iterator.

stream

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

noRemove

public static <T> Iterator<T> noRemove(Iterator<T> iterator)

removeOnNext

public static <T> Iterator<T> removeOnNext(Iterator<T> iterator)