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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/SubSource.scala
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@ -578,9 +578,9 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
/**
* 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,
* 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.
@ -589,12 +589,31 @@ class SubSource[+Out, +Mat](delegate: scaladsl.SubFlow[Out, Mat, scaladsl.Source
*
* '''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
*/
def takeWhile(p: function.Predicate[Out]): SubSource[Out, Mat] =
new SubSource(delegate.takeWhile(p.test))
def takeWhile(p: function.Predicate[Out]): SubSource[Out, Mat] = takeWhile(p, false)
/**
* 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
*/
def takeWhile(p: function.Predicate[Out], inclusive: Boolean): SubSource[Out, Mat] =
new SubSource(delegate.takeWhile(p.test, inclusive))
/**
* Discard elements at the beginning of the stream while predicate is true.