uk.kludje.fn.function

Interface UToLongFunction<T>

All Superinterfaces:

java.util.function.ToLongFunction<T>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
 @Generated(value="uk.kludje.annotation.processor.UncheckedFunctionalInterfaceProcessor")
public interface UToLongFunction<T>
extends java.util.function.ToLongFunction<T>

TLDR; IMPLEMENT long $applyAsLong(T arg0) throws Throwable USING A LAMBDA; INVOKE long applyAsLong(T arg0).

A functional interface for handling checked exceptions. See parent type for interface intent.

long applyAsLong(T arg0) invokes long $applyAsLong(T arg0) and throws anything thrown by long $applyAsLong(T arg0).

General example using java.lang.Runnable that reduces 11 lines to a single line. Call someMethodThatThrowsException in throwsNothing:

 public void someMethodThatThrowsException() throws IOException {
   // I/O functionality
 }

 public void throwsNothing(Runnable r) {
   r.run();
 }
 

Before:

 public void yourMethod() throws IOException {
   try {
     throwsNothing(() -> {
       try {
         someMethodThatThrowsException();
       } catch (IOException e) {
         throw new SomeWrapperException(e);
       }
     });
   } catch(SomeWrapperException w) {
     throw (IOException) w.getCause();
   }
 }
 

After:

 public void yourMethod() throws IOException {
   throwsNothing((URunnable) this::someMethodThatThrowsException);
 }
 

Method public static <T> UToLongFunction<T> asUToLongFunction(UToLongFunction<T> t) provides a convenience method for manufacturing types as an alternative to casting.

Method Summary

Modifier and Type	Method and Description
long	$applyAsLong(T arg0)
default long	applyAsLong(T arg0)
static <T> UToLongFunction<T>	asUToLongFunction(UToLongFunction<T> t)

Method Detail

applyAsLong

default long applyAsLong(T arg0)

Specified by:

applyAsLong in interface java.util.function.ToLongFunction<T>

$applyAsLong

long $applyAsLong(T arg0)
           throws java.lang.Throwable

Throws:

java.lang.Throwable

asUToLongFunction

static <T> UToLongFunction<T> asUToLongFunction(UToLongFunction<T> t)