uk.kludje.fn.util

Interface UComparator<T>

All Superinterfaces:

java.util.Comparator<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 UComparator<T>
extends java.util.Comparator<T>

TLDR; IMPLEMENT int $compare(T arg0, T arg1) throws Throwable USING A LAMBDA; INVOKE int compare(T arg0, T arg1).

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

int compare(T arg0, T arg1) invokes int $compare(T arg0, T arg1) and throws anything thrown by int $compare(T arg0, T arg1).

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> UComparator<T> asUComparator(UComparator<T> t) provides a convenience method for manufacturing types as an alternative to casting.

Method Summary

Modifier and Type	Method and Description
int	$compare(T arg0, T arg1)
static <T> UComparator<T>	asUComparator(UComparator<T> t)
default int	compare(T arg0, T arg1)

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Method Detail

compare

default int compare(T arg0,
                    T arg1)

Specified by:

compare in interface java.util.Comparator<T>

$compare

int $compare(T arg0,
             T arg1)
      throws java.lang.Throwable

Throws:

java.lang.Throwable

asUComparator

static <T> UComparator<T> asUComparator(UComparator<T> t)