akka.japi

JavaPartialFunction

abstract class JavaPartialFunction[A, B] extends AbstractPartialFunction[A, B]

Helper for implementing a *pure* partial function: it will possibly be invoked multiple times for a single “application”, because its only abstract method is used for both isDefinedAt() and apply(); the former is mapped to isCheck == true and the latter to isCheck == false for those cases where this is important to know.

Failure to match is signaled by throwing noMatch(), i.e. not returning normally (the exception used in this case is pre-allocated, hence not that expensive).

new JavaPartialFunction<Object, String>() {
public String apply(Object in, boolean isCheck) {
  if (in instanceof TheThing) {
    if (isCheck) return null; // to spare the expensive or side-effecting code
    return doSomethingWithTheThing((TheThing) in);
  } else {
    throw noMatch();
  }
}
}

The typical use of partial functions from Akka looks like the following:

if (pf.isDefinedAt(x)) {
pf.apply(x);
}

i.e. it will first call PurePartialFunction.apply(x, true) and if that does not throw noMatch() it will continue with calling PurePartialFunction.apply(x, false).

Linear Supertypes
AbstractPartialFunction[A, B], PartialFunction[A, B], (A) ⇒ B, AnyRef, Any
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Inherited
  1. JavaPartialFunction
  2. AbstractPartialFunction
  3. PartialFunction
  4. Function1
  5. AnyRef
  6. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new JavaPartialFunction()

Abstract Value Members

  1. abstract def apply(x: A, isCheck: Boolean): B

    Annotations
    @throws( classOf[Exception] )

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any
  3. final def ##(): Int

    Definition Classes
    AnyRef → Any
  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  5. final def ==(arg0: Any): Boolean

    Definition Classes
    Any
  6. def andThen[C](k: (B) ⇒ C): PartialFunction[A, C]

    Definition Classes
    PartialFunction → Function1
  7. final def apply(x: A): B

    Definition Classes
    JavaPartialFunction → AbstractPartialFunction → Function1
  8. final def applyOrElse[A1 <: A, B1 >: B](x: A1, default: (A1) ⇒ B1): B1

    Definition Classes
    JavaPartialFunction → PartialFunction
  9. final def asInstanceOf[T0]: T0

    Definition Classes
    Any
  10. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
  11. def compose[A](g: (A) ⇒ A): (A) ⇒ B

    Definition Classes
    Function1
    Annotations
    @unspecialized()
  12. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  13. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any
  14. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
  15. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any
  16. def hashCode(): Int

    Definition Classes
    AnyRef → Any
  17. final def isDefinedAt(x: A): Boolean

    Definition Classes
    JavaPartialFunction → PartialFunction
  18. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any
  19. def lift: (A) ⇒ scala.Option[B]

    Definition Classes
    PartialFunction
  20. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  21. final def notify(): Unit

    Definition Classes
    AnyRef
  22. final def notifyAll(): Unit

    Definition Classes
    AnyRef
  23. def orElse[A1 <: A, B1 >: B](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

    Definition Classes
    PartialFunction
  24. def runWith[U](action: (B) ⇒ U): (A) ⇒ Boolean

    Definition Classes
    PartialFunction
  25. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  26. def toString(): String

    Definition Classes
    Function1 → AnyRef → Any
  27. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  28. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()
  29. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

Inherited from AbstractPartialFunction[A, B]

Inherited from PartialFunction[A, B]

Inherited from (A) ⇒ B

Inherited from AnyRef

Inherited from Any

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