uk.kludje.fn.function

Interface UUnaryOperator<T>

All Superinterfaces:

java.util.function.Function<T,T>, java.util.function.UnaryOperator<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 UUnaryOperator<T>
extends java.util.function.UnaryOperator<T>

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

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

T apply(T arg0) invokes T $apply(T arg0) and throws anything thrown by T $apply(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> UUnaryOperator<T> asUUnaryOperator(UUnaryOperator<T> t) provides a convenience method for manufacturing types as an alternative to casting.

Method Summary

Modifier and Type	Method and Description
T	$apply(T arg0)
default T	apply(T arg0)
static <T> UUnaryOperator<T>	asUUnaryOperator(UUnaryOperator<T> t)

Methods inherited from interface java.util.function.UnaryOperator

identity

Methods inherited from interface java.util.function.Function

andThen, compose

Method Detail

apply

default T apply(T arg0)

Specified by:

apply in interface java.util.function.Function<T,T>

$apply

T $apply(T arg0)
  throws java.lang.Throwable

Throws:

java.lang.Throwable

asUUnaryOperator

static <T> UUnaryOperator<T> asUUnaryOperator(UUnaryOperator<T> t)