GroupByStreamTransformer<S, T> class
The GroupBy operator divides a Stream that emits items into a Stream that emits GroupByStream, each one of which emits some subset of the items from the original source Stream.
GroupByStream acts like a regular Stream, yet
adding a 'key' property, which receives its Type and value from
the _grouper Function.
All items with the same key are emitted by the same GroupByStream.
- Inheritance
-
- Object
- StreamTransformerBase<
S, GroupByStream< S, T> > - GroupByStreamTransformer
Constructors
- GroupByStreamTransformer(T grouper(S event))
- Constructs a StreamTransformer which groups events from the source Stream and emits them as GroupByStream.
Properties
- grouper → T Function(S event)
-
Method which converts incoming events into a new GroupByStream
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
bind(
Stream< S> stream) → Stream<GroupByStream< S, T> > -
Transforms the provided
stream.override -
cast<
RS, RT> () → StreamTransformer< RS, RT> -
Provides a
StreamTransformer<RS, RT>view of this stream transformer.inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited