Package org.opendaylight.yangtools.util

Class SingletonSet<E>

java.lang.Object

org.opendaylight.yangtools.util.SingletonSet<E>

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Set<E>, Immutable

public abstract sealed class SingletonSet<E>
extends Object
implements Set<E>, Immutable, Serializable

A Set containing a single value. For some reason neither Java nor Guava provide direct access to the retained element -- which is desirable in some situations, as is the case in SharedSingletonMap.entrySet().

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
SingletonSet()

Method Summary

Modifier and Type	Method	Description
final boolean	add(E e)
final boolean	addAll(Collection<? extends E> c)
final void	clear()
final boolean	containsAll(Collection<?> c)
final boolean	equals(Object obj)
abstract E	getElement()	Return the single element contained in this set.
abstract int	hashCode()
final boolean	isEmpty()
final @NonNull Iterator<E>	iterator()
static <E> @NonNull SingletonSet<E>	of(@Nullable E element)
final boolean	remove(Object o)
final boolean	removeAll(Collection<?> c)
final boolean	retainAll(Collection<?> c)
final int	size()
abstract @NonNull Spliterator<E>	spliterator()
final @NonNull Object[]	toArray()
final <T> @NonNull T[]	toArray(T[] a)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

contains

Constructor Details

SingletonSet

public SingletonSet()

Method Details

of

public static <E> @NonNull SingletonSet<E> of(@Nullable E element)

getElement

public abstract E getElement()

Return the single element contained in this set.

Returns:

This set's element.

size

public final int size()

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

isEmpty

public final boolean isEmpty()

Specified by:

isEmpty in interface Collection<E>

Specified by:

isEmpty in interface Set<E>

iterator

public final @NonNull Iterator<E> iterator()

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface Set<E>

spliterator

public abstract @NonNull Spliterator<E> spliterator()

Specified by:

spliterator in interface Collection<E>

Specified by:

spliterator in interface Iterable<E>

Specified by:

spliterator in interface Set<E>

toArray

public final @NonNull Object[] toArray()

Specified by:

toArray in interface Collection<E>

Specified by:

toArray in interface Set<E>

toArray

public final <T> @NonNull T[] toArray(T[] a)

Specified by:

toArray in interface Collection<E>

Specified by:

toArray in interface Set<E>

add

public final boolean add(E e)

Specified by:

add in interface Collection<E>

Specified by:

add in interface Set<E>

remove

public final boolean remove(Object o)

Specified by:

remove in interface Collection<E>

Specified by:

remove in interface Set<E>

containsAll

public final boolean containsAll(Collection<?> c)

Specified by:

containsAll in interface Collection<E>

Specified by:

containsAll in interface Set<E>

addAll

public final boolean addAll(Collection<? extends E> c)

Specified by:

addAll in interface Collection<E>

Specified by:

addAll in interface Set<E>

retainAll

public final boolean retainAll(Collection<?> c)

Specified by:

retainAll in interface Collection<E>

Specified by:

retainAll in interface Set<E>

removeAll

public final boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<E>

Specified by:

removeAll in interface Set<E>

clear

public final void clear()

Specified by:

clear in interface Collection<E>

Specified by:

clear in interface Set<E>

hashCode

public abstract int hashCode()

Specified by:

hashCode in interface Collection<E>

Specified by:

hashCode in interface Set<E>

Overrides:

hashCode in class Object

equals

public final boolean equals(Object obj)

Specified by:

equals in interface Collection<E>

Specified by:

equals in interface Set<E>

Overrides:

equals in class Object