Package it.unimi.dsi.fastutil.objects

Class ReferenceSets

java.lang.Object

it.unimi.dsi.fastutil.objects.ReferenceSets

public final class ReferenceSets
extends Object

A class providing static methods and objects that do useful things with type-specific sets.

See Also:

• Collections

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ReferenceSets.EmptySet<K>	An immutable class representing the empty set and implementing a type-specific set interface.
static class	ReferenceSets.Singleton<K>	An immutable class representing a type-specific singleton set.
static class	ReferenceSets.SynchronizedSet<K>	A synchronized wrapper class for sets.
static class	ReferenceSets.UnmodifiableSet<K>	An unmodifiable wrapper class for sets.

Field Summary

Fields

Modifier and Type	Field	Description
static final ReferenceSets.EmptySet	EMPTY_SET	An empty set (immutable).

Method Summary

Modifier and Type	Method	Description
static <K> ReferenceSet<K>	emptySet()	Returns an empty set (immutable).
static <K> ReferenceSet<K>	singleton(K element)	Returns a type-specific immutable set containing only the specified element.
static <K> ReferenceSet<K>	synchronize(ReferenceSet<K> s)	Returns a synchronized type-specific set backed by the given type-specific set.
static <K> ReferenceSet<K>	synchronize(ReferenceSet<K> s, Object sync)	Returns a synchronized type-specific set backed by the given type-specific set, using an assigned object to synchronize.
static <K> ReferenceSet<K>	unmodifiable(ReferenceSet<? extends K> s)	Returns an unmodifiable type-specific set backed by the given type-specific set.

Methods inherited from class java.lang.Object

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

Field Details

EMPTY_SET

public static final ReferenceSets.EmptySet EMPTY_SET

An empty set (immutable). It is serializable and cloneable.

Method Details

emptySet

public static <K> ReferenceSet<K> emptySet()

Returns an empty set (immutable). It is serializable and cloneable.

This method provides a typesafe access to EMPTY_SET.

Returns:

an empty set (immutable).

singleton

public static <K> ReferenceSet<K> singleton(K element)

Returns a type-specific immutable set containing only the specified element. The returned set is serializable and cloneable.

Parameters:

element - the only element of the returned set.

Returns:

a type-specific immutable set containing just element.

synchronize

public static <K> ReferenceSet<K> synchronize(ReferenceSet<K> s)

Returns a synchronized type-specific set backed by the given type-specific set.

Parameters:

s - the set to be wrapped in a synchronized set.

Returns:

a synchronized view of the specified set.

See Also:

• Collections.synchronizedSet(Set)

synchronize

public static <K> ReferenceSet<K> synchronize(ReferenceSet<K> s,
 Object sync)

Returns a synchronized type-specific set backed by the given type-specific set, using an assigned object to synchronize.

Parameters:

s - the set to be wrapped in a synchronized set.

sync - an object that will be used to synchronize the access to the set.

Returns:

a synchronized view of the specified set.

See Also:

• Collections.synchronizedSet(Set)

unmodifiable

public static <K> ReferenceSet<K> unmodifiable(ReferenceSet<? extends K> s)

Returns an unmodifiable type-specific set backed by the given type-specific set.

Parameters:

s - the set to be wrapped in an unmodifiable set.

Returns:

an unmodifiable view of the specified set.

See Also:

• Collections.unmodifiableSet(Set)