Packages

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 JavaPartialFunction.apply(x, true) and if that does not throw noMatch() it will continue with calling JavaPartialFunction.apply(x, false).

Linear Supertypes
AbstractPartialFunction[A, B], PartialFunction[A, B], (A) => B, AnyRef, Any
Ordering
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  2. By Inheritance
Inherited
  1. JavaPartialFunction
  2. AbstractPartialFunction
  3. PartialFunction
  4. Function1
  5. AnyRef
  6. Any
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Visibility
  1. Public
  2. Protected

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: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def andThen[C](k: PartialFunction[B, C]): PartialFunction[A, C]
    Definition Classes
    PartialFunction
  5. def andThen[C](k: (B) => C): PartialFunction[A, C]
    Definition Classes
    PartialFunction → Function1
  6. final def apply(x: A): B
    Definition Classes
    JavaPartialFunction → AbstractPartialFunction → Function1
  7. final def applyOrElse[A1 <: A, B1 >: B](x: A1, default: (A1) => B1): B1
    Definition Classes
    JavaPartialFunction → PartialFunction
  8. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  9. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
  10. def compose[R](k: PartialFunction[R, A]): PartialFunction[R, B]
    Definition Classes
    PartialFunction
  11. def compose[A](g: (A) => A): (A) => B
    Definition Classes
    Function1
    Annotations
    @unspecialized()
  12. def elementWise: ElementWiseExtractor[A, B]
    Definition Classes
    PartialFunction
  13. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  15. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @IntrinsicCandidate() @native()
  16. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @IntrinsicCandidate() @native()
  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
    Annotations
    @IntrinsicCandidate() @native()
  22. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @IntrinsicCandidate() @native()
  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. def unapply(a: A): scala.Option[B]
    Definition Classes
    PartialFunction
  28. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  29. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  30. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

    (Since version 9)

Inherited from AbstractPartialFunction[A, B]

Inherited from PartialFunction[A, B]

Inherited from (A) => B

Inherited from AnyRef

Inherited from Any

Ungrouped