com.unboundid.util

Class ReverseComparator<T>

java.lang.Object

com.unboundid.util.ReverseComparator<T>

Type Parameters:

T - The type of object to use with this comparator.

All Implemented Interfaces:

java.io.Serializable, java.util.Comparator<T>

@NotMutable
 @ThreadSafety(level=COMPLETELY_THREADSAFE)
public final class ReverseComparator<T>
extends java.lang.Object
implements java.util.Comparator<T>, java.io.Serializable

This class provides an implementation of a Comparator object that may be used to iterate through values in what would normally be considered reverse order.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ReverseComparator() Creates a new comparator that will sort items in reverse order.
ReverseComparator(java.util.Comparator<T> baseComparator) Creates a new comparator that will sort items in the reverse order that they would be normally sorted using the given comparator.

Method Summary

Modifier and Type	Method and Description
int	compare(T o1, T o2) Compares the provided objects to determine their relative order in a sorted list.
boolean	equals(java.lang.Object o) Indicates whether the provided object may be considered equal to this comparator.
int	hashCode() Retrieves a hash code for this class.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

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

Constructor Detail

ReverseComparator

public ReverseComparator()

Creates a new comparator that will sort items in reverse order. The generic type for this class must implement the Comparable interface.

ReverseComparator

public ReverseComparator(@NotNull
                         java.util.Comparator<T> baseComparator)

Creates a new comparator that will sort items in the reverse order that they would be normally sorted using the given comparator.

Parameters:

baseComparator - The base comparator that will be used to make the determination.

Method Detail

compare

public int compare(@NotNull
                   T o1,
                   @NotNull
                   T o2)

Compares the provided objects to determine their relative order in a sorted list.

Specified by:

compare in interface java.util.Comparator<T>

Parameters:

o1 - The first object to compare.

o2 - The second object to compare.

Returns:

A negative integer if the first object should be ordered before the second, a positive integer if the first object should be ordered after the second, or zero if there is no difference in their relative orders.

hashCode

public int hashCode()

Retrieves a hash code for this class.

Overrides:

hashCode in class java.lang.Object

Returns:

A hash code for this class.

equals

public boolean equals(@Nullable
                      java.lang.Object o)

Indicates whether the provided object may be considered equal to this comparator.

Specified by:

equals in interface java.util.Comparator<T>

Overrides:

equals in class java.lang.Object

Parameters:

o - The object for which to make the determination.

Returns:

true if the provided object may be considered equal to this comparator, or false if not.