org.osgl

Class Lang.Comparator<T>

java.lang.Object

org.osgl.Lang.FuncBase

org.osgl.Lang.F2<T,T,Integer>

org.osgl.Lang.Comparator<T>

Type Parameters:

T - the type of the element to be compared

All Implemented Interfaces:

Serializable, Comparator<T>, Lang.Func2<T,T,Integer>

Enclosing class:

Lang

public abstract static class Lang.Comparator<T>
extends Lang.F2<T,T,Integer>
implements Comparator<T>, Serializable

Adapt JDK Comparator (since 1.2) to Functional programming. The class provides several java8 Comparator methods

Since:

0.2

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Comparator()

Method Summary

Modifier and Type	Method and Description
Integer	apply(T p1, T p2) Apply the two params to the function
Lang.Comparator<T>	reversed() See Java 8 doc
Lang.Comparator<T>	thenComparing(Comparator<? super T> other) See Java 8 doc
<U extends Comparable<? super U>> Lang.Comparator<T>	thenComparing(Lang.Function<? super T,? extends U> keyExtractor) See Java 8 doc
<U extends Comparable<? super U>> Lang.Comparator<T>	thenComparing(Lang.Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) See Java 8 doc

Methods inherited from class org.osgl.Lang.F2

andThen, andThen, applyOrElse, curry, curry, lift, orElse

Methods inherited from class org.osgl.Lang.FuncBase

breakOut

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

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

Constructor Detail

Comparator

public Comparator()

Method Detail

apply

public Integer apply(T p1,
                     T p2)
              throws NotAppliedException,
                     Lang.Break

Description copied from interface: Lang.Func2

Apply the two params to the function

In case implementing a partial function, it can throw out an NotAppliedException if the function is not defined for the given parameter(s)

Specified by:

apply in interface Lang.Func2<T,T,Integer>

Parameters:

p1 - the first argument of type P1

p2 - the second argument of type P2

Returns:

the result of type R

Throws:

NotAppliedException - if the function doesn’t apply to the parameter(s)

Lang.Break - to short cut collecting operations (fold/reduce) on an container

reversed

public Lang.Comparator<T> reversed()

See Java 8 doc

Specified by:

reversed in interface Comparator<T>

Since:

0.2

thenComparing

public Lang.Comparator<T> thenComparing(Comparator<? super T> other)

See Java 8 doc

Specified by:

thenComparing in interface Comparator<T>

Since:

0.2

thenComparing

public <U extends Comparable<? super U>> Lang.Comparator<T> thenComparing(Lang.Function<? super T,? extends U> keyExtractor,
                                                                          Comparator<? super U> keyComparator)

See Java 8 doc

Type Parameters:

U - the generic type of the key

Parameters:

keyExtractor - The function to extract the key for comparison

keyComparator - The function to compare the extracted key

Returns:

a function that extract key of type U from element of type T and run keyComparator to compare the two keys

Since:

0.2

thenComparing

public <U extends Comparable<? super U>> Lang.Comparator<T> thenComparing(Lang.Function<? super T,? extends U> keyExtractor)

See Java 8 doc

Type Parameters:

U - the key type

Parameters:

keyExtractor - the function that extract key of type U from instance of type T

Returns:

a comparator that applied if the result of this comparator is even