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Class SingletonSortedSet

Object
  AbstractCollection
      AbstractSet
          ImmutableSet
              SingletonSortedSet

All Implemented Interfaces:

Collection, Set, SortedSet

public class SingletonSortedSet

extends ImmutableSet

implements SortedSet

A singleton SortedSet, meaning a SortedSet with exactly one element. The set is immutable.

Author:

Mark McConnell

Constructor Summary

SingletonSortedSet(Object element)
Constructor.

Method Summary

Comparator	comparator() Returns a dummy comparator in which the unique element of this set is always equal to itself.
boolean	contains(Object o)
Object	first()
int	hashCode()
SortedSet	headSet(Object to) Returns an empty SortedSet.
boolean	isEmpty()
Iterator	iterator()
Object	last()
int	size()
SortedSet	subSet(Object from, Object to) Returns an empty SortedSet.
SortedSet	tailSet(Object from) Returns this if from is the unique element of this set, and an empty SortedSet otherwise.

Methods inherited from class ImmutableSet

add, addAll, clear, remove, removeAll, retainAll

Methods inherited from class AbstractSet

equals

Methods inherited from class AbstractCollection

containsAll, toArray, toArray, toString

Methods inherited from class Object

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

Methods inherited from interface Set

add, addAll, clear, containsAll, equals, remove, removeAll, retainAll, toArray, toArray

Constructor Detail

SingletonSortedSet

public SingletonSortedSet(Object element)

Constructor.

Parameters:

element - The unique element of this sorted set.

Throws:

NullPointerException - If element is null.

Method Detail

contains

public final boolean contains(Object o)

Specified by:

contains in interface Set

hashCode

public final int hashCode()

Specified by:

hashCode in interface Set

isEmpty

public final boolean isEmpty()

Specified by:

isEmpty in interface Set

iterator

public Iterator iterator()

Specified by:

iterator in interface Set

size

public final int size()

Specified by:

size in interface Set

first

public final Object first()

Specified by:

first in interface SortedSet

last

public final Object last()

Specified by:

last in interface SortedSet

comparator

public final Comparator comparator()

Returns a dummy comparator in which the unique element of this set is always equal to itself.

Specified by:

comparator in interface SortedSet

subSet

public SortedSet subSet(Object from,
                        Object to)

Returns an empty SortedSet.

Specified by:

subSet in interface SortedSet

headSet

public SortedSet headSet(Object to)

Returns an empty SortedSet.

Specified by:

headSet in interface SortedSet

tailSet

public SortedSet tailSet(Object from)

Returns this if from is the unique element of this set, and an empty SortedSet otherwise.

Specified by:

tailSet in interface SortedSet