IGatherer Interface

Definition

Namespace:: Java.Util.Streams

Assembly:: Mono.Android.dll

Important

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An intermediate operation that transforms a stream of input elements into a stream of output elements, optionally applying a final action when the end of the upstream is reached.

[Android.Runtime.Register("java/util/stream/Gatherer", "", "Java.Util.Streams.IGathererInvoker", ApiSince=36)]
[Java.Interop.JavaTypeParameters(new System.String[] { "T", "A", "R" })]
public interface IGatherer : Android.Runtime.IJavaObject, IDisposable, Java.Interop.IJavaPeerable

[<Android.Runtime.Register("java/util/stream/Gatherer", "", "Java.Util.Streams.IGathererInvoker", ApiSince=36)>]
[<Java.Interop.JavaTypeParameters(new System.String[] { "T", "A", "R" })>]
type IGatherer = interface
    interface IJavaObject
    interface IDisposable
    interface IJavaPeerable

Derived: Java.Util.Streams.IGatherer.IIntegrator.IGreedy

Attributes: RegisterAttribute JavaTypeParametersAttribute

Implements: IJavaObject IJavaPeerable IDisposable

Remarks

An intermediate operation that transforms a stream of input elements into a stream of output elements, optionally applying a final action when the end of the upstream is reached. The transformation may be stateless or stateful, and may buffer input before producing any output.

Gatherer operations can be performed either sequentially, or be parallelized -- if a combiner function is supplied.

There are many examples of gathering operations, including but not limited to: grouping elements into batches (windowing functions); de-duplicating consecutively similar elements; incremental accumulation functions (prefix scan); incremental reordering functions, etc. The class java.util.stream.Gatherers provides implementations of common gathering operations.

Added in 24.

Java documentation for java.util.stream.Gatherer.

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Properties

Name	Description
Handle	Gets the JNI value of the underlying Android object. (Inherited from IJavaObject)
JniIdentityHashCode	Returns the value of `java.lang.System.identityHashCode()` for the wrapped instance. (Inherited from IJavaPeerable)
JniManagedPeerState	State of the managed peer. (Inherited from IJavaPeerable)
JniObjectReferenceControlBlock	(Inherited from IJavaPeerable)
JniPeerMembers	Member access and invocation support. (Inherited from IJavaPeerable)
PeerReference	Returns a JniObjectReference of the wrapped Java object instance. (Inherited from IJavaPeerable)

Methods

Name	Description
AndThen(IGatherer)	Returns a composed Gatherer which connects the output of this Gatherer to the input of that Gatherer.
Combiner()	A function which accepts two intermediate states and combines them into one.
DefaultCombiner()	Returns a combiner which is the default combiner of a Gatherer.
DefaultFinisher()	Returns a `finisher` which is the default finisher of a `Gatherer`.
DefaultInitializer()	Returns an initializer which is the default initializer of a Gatherer.
Disposed()	Called when the instance has been disposed. (Inherited from IJavaPeerable)
DisposeUnlessReferenced()	If there are no outstanding references to this instance, then calls `Dispose()`; otherwise, does nothing. (Inherited from IJavaPeerable)
Finalized()	Called when the instance has been finalized. (Inherited from IJavaPeerable)
Finisher()	A function which accepts the final intermediate state and a `Downstream` object, allowing to perform a final action at the end of input elements.
GetIntegrator()
Initializer()	A function that produces an instance of the intermediate state used for this gathering operation.
Of(IGatherer+IIntegrator, IBiConsumer)
Of(IGatherer+IIntegrator)
Of(ISupplier, IGatherer+IIntegrator, IBinaryOperator, IBiConsumer)
OfSequential(IGatherer+IIntegrator, IBiConsumer)
OfSequential(IGatherer+IIntegrator)
OfSequential(ISupplier, IGatherer+IIntegrator, IBiConsumer)
OfSequential(ISupplier, IGatherer+IIntegrator)
SetJniIdentityHashCode(Int32)	Set the value returned by `JniIdentityHashCode`. (Inherited from IJavaPeerable)
SetJniManagedPeerState(JniManagedPeerStates)	(Inherited from IJavaPeerable)
SetPeerReference(JniObjectReference)	Set the value returned by `PeerReference`. (Inherited from IJavaPeerable)
UnregisterFromRuntime()	Unregister this instance so that the runtime will not return it from future Java.Interop.JniRuntime+JniValueManager.PeekValue invocations. (Inherited from IJavaPeerable)

Extension Methods

Name	Description
GetJniTypeName(IJavaPeerable)	Gets the JNI name of the type of the instance `self`.
JavaAs<TResult>(IJavaPeerable)	Try to coerce `self` to type `TResult`, checking that the coercion is valid on the Java side.
JavaCast<TResult>(IJavaObject)	Performs an Android runtime-checked type conversion.
JavaCast<TResult>(IJavaObject)
TryJavaCast<TResult>(IJavaPeerable, TResult)	Try to coerce `self` to type `TResult`, checking that the coercion is valid on the Java side.

Applies to