public abstract class JavaPartialFunction<A,B>
extends scala.runtime.AbstractPartialFunction<A,B>
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)
.
Modifier and Type | Class and Description |
---|---|
static class |
JavaPartialFunction.NoMatch$ |
static class |
JavaPartialFunction.NoMatchException |
Constructor and Description |
---|
JavaPartialFunction() |
Modifier and Type | Method and Description |
---|---|
B |
apply(A x) |
abstract B |
apply(A x,
boolean isCheck) |
<A1 extends A,B1> |
applyOrElse(A1 x,
scala.Function1<A1,B1> default_) |
boolean |
isDefinedAt(A x) |
static java.lang.RuntimeException |
noMatch() |
andThen, apply$mcDD$sp, apply$mcDF$sp, apply$mcDI$sp, apply$mcDJ$sp, apply$mcFD$sp, apply$mcFF$sp, apply$mcFI$sp, apply$mcFJ$sp, apply$mcID$sp, apply$mcIF$sp, apply$mcII$sp, apply$mcIJ$sp, apply$mcJD$sp, apply$mcJF$sp, apply$mcJI$sp, apply$mcJJ$sp, apply$mcVD$sp, apply$mcVF$sp, apply$mcVI$sp, apply$mcVJ$sp, apply$mcZD$sp, apply$mcZF$sp, apply$mcZI$sp, apply$mcZJ$sp, compose, lift, orElse, runWith, toString