DaggerStreams

java.lang.Object
- dagger.internal.codegen.DaggerStreams

public final class DaggerStreams
extends java.lang.Object

Utilities for streams.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T> java.util.function.Function<java.lang.Object,java.util.stream.Stream<T>>`	`instancesOf(java.lang.Class<T> to)` Returns a function from `Object` to `Stream<T>`, which returns a stream containing its input if its input is an instance of `T`.
`static <T> java.util.function.Function<java.util.Optional<T>,java.util.stream.Stream<T>>`	`presentValues()` A function that you can use to extract the present values from a stream of `Optional`s.
`static <T> java.util.stream.Stream<T>`	`stream(java.lang.Iterable<T> iterable)` Returns a sequential `Stream` of the contents of `iterable`, delegating to `Collection.stream()` if possible.
`static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableList<T>>`	`toImmutableList()` Returns a `Collector` that accumulates the input elements into a new `ImmutableList`, in encounter order.
`static <T,K,V> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableMap<K,V>>`	`toImmutableMap(java.util.function.Function<? super T,K> keyMapper, java.util.function.Function<? super T,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.
`static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableSet<T>>`	`toImmutableSet()` Returns a `Collector` that accumulates the input elements into a new `ImmutableSet`, in encounter order.
`static <T,K,V> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableSetMultimap<K,V>>`	`toImmutableSetMultimap(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 `ImmutableSetMultimap` whose keys and values are the result of applying the provided mapping functions to the input elements.
`static <E extends java.lang.Enum<E>> java.util.stream.Stream<E>`	`valuesOf(java.lang.Class<E> enumType)` Returns a stream of all values of the given `enumType`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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 a new ImmutableList, in encounter order.

toImmutableSet

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

Returns a Collector that accumulates the input elements into a new ImmutableSet, in encounter order.

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,K> keyMapper,
                                                                                                                 java.util.function.Function<? super T,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. Entries appear in the result ImmutableMap in encounter order.

toImmutableSetMultimap

public static <T,K,V> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableSetMultimap<K,V>> toImmutableSetMultimap(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 ImmutableSetMultimap whose keys and values are the result of applying the provided mapping functions to the input elements. Entries appear in the result ImmutableSetMultimap in encounter order.

instancesOf

public static <T> java.util.function.Function<java.lang.Object,java.util.stream.Stream<T>> instancesOf(java.lang.Class<T> to)

Returns a function from Object to Stream<T>, which returns a stream containing its input if its input is an instance of T.

Use as an argument to Stream.flatMap(Function):

 Stream<Bar> barStream = fooStream.flatMap(instancesOf(Bar.class));

valuesOf

public static <E extends java.lang.Enum<E>> java.util.stream.Stream<E> valuesOf(java.lang.Class<E> enumType)

Returns a stream of all values of the given enumType.

presentValues

public static <T> java.util.function.Function<java.util.Optional<T>,java.util.stream.Stream<T>> presentValues()

A function that you can use to extract the present values from a stream of Optionals.


 Set<Foo> foos =
     optionalFoos()
         .flatMap(DaggerStreams.presentValues())
         .collect(toSet());

stream
```
public static <T> java.util.stream.Stream<T> stream(java.lang.Iterable<T> iterable)
```
Returns a sequential Stream of the contents of iterable, delegating to Collection.stream() if possible.

Class DaggerStreams