Class Sets

java.lang.Object

org.glassfish.jersey.internal.guava.Sets

public final class Sets
extends Object

Static utility methods pertaining to Set instances. Also see this class's counterparts Lists, Maps and

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Queues

.

See the Guava User Guide article on Sets.

Since:

2.0 (imported from Google Collections Library)

Author:

Kevin Bourrillion, Jared Levy, Chris Povirk

Method Summary

Modifier and Type	Method	Description
static <E> HashSet<E>	newHashSet()	Creates a mutable, empty HashSet instance.
static <E> HashSet<E>	newHashSetWithExpectedSize(int expectedSize)	Creates a HashSet instance, with a high enough "initial capacity" that it should hold expectedSize elements without growth.
static <E> NavigableSet<E>	unmodifiableNavigableSet(NavigableSet<E> set)	Returns an unmodifiable view of the specified navigable set.

Methods inherited from class Object

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

Method Details

newHashSet

public static <E> HashSet<E> newHashSet()

Creates a mutable, empty HashSet instance.

Note: if mutability is not required, use

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ImmutableSet#of()

instead.

Note: if E is an Enum type, use EnumSet.noneOf(Class) instead.

Returns:

a new, empty HashSet

newHashSetWithExpectedSize

public static <E> HashSet<E> newHashSetWithExpectedSize(int expectedSize)

Creates a HashSet instance, with a high enough "initial capacity" that it should hold expectedSize elements without growth. This behavior cannot be broadly guaranteed, but it is observed to be true for OpenJDK 1.6. It also can't be guaranteed that the method isn't inadvertently oversizing the returned set.

Parameters:

expectedSize - the number of elements you expect to add to the returned set

Returns:

a new, empty HashSet with enough capacity to hold expectedSize elements without resizing

Throws:

IllegalArgumentException - if expectedSize is negative

unmodifiableNavigableSet

public static <E> NavigableSet<E> unmodifiableNavigableSet(NavigableSet<E> set)

Returns an unmodifiable view of the specified navigable set. This method allows modules to provide users with "read-only" access to internal navigable sets. Query operations on the returned set "read through" to the specified set, and attempts to modify the returned set, whether direct or via its collection views, result in an UnsupportedOperationException.

The returned navigable set will be serializable if the specified navigable set is serializable.

Parameters:

set - the navigable set for which an unmodifiable view is to be returned

Returns:

an unmodifiable view of the specified navigable set

Since:

12.0