com.mware.ge.util

Class StreamUtils

java.lang.Object

com.mware.ge.util.StreamUtils

public class StreamUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static <T> Predicate<T>	distinctBy(Function<? super T,?> fn)
static <TItem,TReturn> TReturn	ifEmpty(Stream<TItem> stream, Supplier<TReturn> trueFunc, Function<Stream<TItem>,TReturn> falseFunc)
static <T,R> Stream<R>	mapOptional(Stream<T> stream, Function<T,R> transform)
static <T> Stream<T>	stream(Iterable<T>... iterables) Create a Stream over the elements of the iterables, in order.
static <T> Stream<T>	stream(Iterator<T>... iterators) Create a Stream over the elements of the iterators, in order.
static Stream<Element>	stream(Query... queries) Create a Stream containing the results of executing the queries, in order.
static <T> Collector<T,com.google.common.collect.ImmutableList.Builder<T>,com.google.common.collect.ImmutableList<T>>	toImmutableList()
static <T,K,V> Collector<T,com.google.common.collect.ImmutableMap.Builder<K,V>,com.google.common.collect.ImmutableMap<K,V>>	toImmutableMap(Function<? super T,? extends K> keyMapper, Function<? super T,? extends V> valueMapper)
static <T> Collector<T,com.google.common.collect.ImmutableSet.Builder<T>,com.google.common.collect.ImmutableSet<T>>	toImmutableSet()
static <T> Iterable<T>	toIterable(Stream<T> stream)
static <T> Collector<T,LinkedHashSet<T>,LinkedHashSet<T>>	toLinkedHashSet()

Methods inherited from class java.lang.Object

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

Method Detail

stream

public static Stream<Element> stream(Query... queries)

Create a Stream containing the results of executing the queries, in order. The results are not loaded into memory first.

stream

@SafeVarargs
public static <T> Stream<T> stream(Iterable<T>... iterables)

Create a Stream over the elements of the iterables, in order. A list of iterators is first created from the iterables, and passed to stream(Iterator[]). The iterable elements are not loaded into memory first.

stream

@SafeVarargs
public static <T> Stream<T> stream(Iterator<T>... iterators)

Create a Stream over the elements of the iterators, in order. The iterator elements are not loaded into memory first.

toImmutableList

public static <T> Collector<T,com.google.common.collect.ImmutableList.Builder<T>,com.google.common.collect.ImmutableList<T>> toImmutableList()

toImmutableSet

public static <T> Collector<T,com.google.common.collect.ImmutableSet.Builder<T>,com.google.common.collect.ImmutableSet<T>> toImmutableSet()

toImmutableMap

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

toLinkedHashSet

public static <T> Collector<T,LinkedHashSet<T>,LinkedHashSet<T>> toLinkedHashSet()

ifEmpty

public static <TItem,TReturn> TReturn ifEmpty(Stream<TItem> stream,
                                              Supplier<TReturn> trueFunc,
                                              Function<Stream<TItem>,TReturn> falseFunc)

distinctBy

public static <T> Predicate<T> distinctBy(Function<? super T,?> fn)

mapOptional

public static <T,R> Stream<R> mapOptional(Stream<T> stream,
                                          Function<T,R> transform)

toIterable

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