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Added a flag on takeWhile to allow it to include the final element, #21330

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Falmarri 2016-04-20 14:47:32 -07:00 • committed by Patrik Nordwall
parent 7eb660b497
commit a28d2c579f
9 changed files with 120 additions and 30 deletions
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31
akka-stream/src/main/scala/akka/stream/javadsl/Flow.scala
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@ -777,9 +777,9 @@ final class Flow[-In, +Out, +Mat](delegate: scaladsl.Flow[In, Out, Mat]) extends
/**
* Terminate processing (and cancel the upstream publisher) after predicate
* returns false for the first time. Due to input buffering some elements may have been
* requested from upstream publishers that will then not be processed downstream
* of this step.
* returns false for the first time, including the first failed element iff inclusive is true
* Due to input buffering some elements may have been requested from upstream publishers
* that will then not be processed downstream of this step.
*
* The stream will be completed without producing any elements if predicate is false for
* the first stream element.
@ -788,13 +788,34 @@ final class Flow[-In, +Out, +Mat](delegate: scaladsl.Flow[In, Out, Mat]) extends
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' predicate returned false or upstream completes
* '''Completes when''' predicate returned false (or 1 after predicate returns false if `inclusive` or upstream completes
*
* '''Cancels when''' predicate returned false or downstream cancels
*
* See also [[Flow.limit]], [[Flow.limitWeighted]]
*/
def takeWhile(p: function.Predicate[Out]): javadsl.Flow[In, Out, Mat] = new Flow(delegate.takeWhile(p.test))
def takeWhile(p: function.Predicate[Out], inclusive: Boolean = false): javadsl.Flow[In, Out, Mat] = new Flow(delegate.takeWhile(p.test, inclusive))
/**
* Terminate processing (and cancel the upstream publisher) after predicate
* returns false for the first time, including the first failed element iff inclusive is true
* Due to input buffering some elements may have been requested from upstream publishers
* that will then not be processed downstream of this step.
*
* The stream will be completed without producing any elements if predicate is false for
* the first stream element.
*
* '''Emits when''' the predicate is true
*
* '''Backpressures when''' downstream backpressures
*
* '''Completes when''' predicate returned false (or 1 after predicate returns false if `inclusive` or upstream completes
*
* '''Cancels when''' predicate returned false or downstream cancels
*
* See also [[Flow.limit]], [[Flow.limitWeighted]]
*/
def takeWhile(p: function.Predicate[Out]): javadsl.Flow[In, Out, Mat] = takeWhile(p, false)
/**
* Discard elements at the beginning of the stream while predicate is true.