Class Filter$

  extended by akka.dispatch.Filter$

public class Filter$
extends java.lang.Object

Java API (not recommended): Callback for the Future.filter operation that creates a new Future which will conditionally contain the success of another Future.

Unfortunately it is not possible to express the type of a Scala filter in Java: Function1[T, Boolean], where “Boolean” is the primitive type. It is possible to use Future.filter by constructing such a function indirectly:

 import static akka.dispatch.Filter.filterOf;
 Future<String> f = ...;
 f.filter(filterOf(new Function<String, Boolean>() {
   public Boolean apply(String s) {

However, Future.filter exists mainly to support Scala’s for-comprehensions, thus Java users should prefer Future.map, translating non-matching values to failure cases.

Field Summary
static Filter$ MODULE$
          Static reference to the singleton instance of this Scala object.
Constructor Summary
Method Summary
<T> scala.Function1<T,java.lang.Object>
filterOf(Function<T,java.lang.Boolean> f)
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


public static final Filter$ MODULE$
Static reference to the singleton instance of this Scala object.

Constructor Detail


public Filter$()
Method Detail


public <T> scala.Function1<T,java.lang.Object> filterOf(Function<T,java.lang.Boolean> f)