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+str #17226 add dropWhile and takeWhile

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This commit is contained in:
Alexander Golubev 2015-06-12 23:22:36 -04:00
parent 632868b868
commit 6f9438a2b0
11 changed files with 326 additions and 0 deletions
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18
akka-stream/src/main/scala/akka/stream/javadsl/Source.scala
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@ -406,6 +406,24 @@ class Source[+Out, +Mat](delegate: scaladsl.Source[Out, Mat]) extends Graph[Sour
def dropWithin(d: FiniteDuration): javadsl.Source[Out, Mat] =
new Source(delegate.dropWithin(d))
/**
* Terminate processing (and cancel the upstream publisher) after predicate returned 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.
*
* @param p predicate is evaluated for each new element until first time returns false
*/
def takeWhile(p: function.Predicate[Out]): javadsl.Source[Out, Mat] = new Source(delegate.takeWhile(p.test))
/**
* Discard elements at the beginning of the stream while predicate is true.
* No elements will be dropped after predicate first time returned false.
*
* @param p predicate is evaluated for each new element until first time returns false
*/
def dropWhile(p: function.Predicate[Out]): javadsl.Source[Out, Mat] = new Source(delegate.dropWhile(p.test))
/**
* Terminate processing (and cancel the upstream publisher) after the given
* number of elements. Due to input buffering some elements may have been