CopyOnWriteMultiset

Kotlin |Java

@UnstableApi
public final class CopyOnWriteMultiset<E extends Object> implements Iterable

An unordered collection of elements that allows duplicates, but also allows access to a set of unique elements.

This class is thread-safe using the same method as . Mutation methods cause the underlying data to be copied. elementSet and iterator return snapshots that are unaffected by subsequent mutations.

Iterating directly on this class reveals duplicate elements. Unique elements can be accessed via elementSet. Iteration order for both of these is not defined.

Parameters
`<E extends Object>`	The type of element being stored.

Summary

Public constructors
`CopyOnWriteMultiset()`

Public methods
`void`	`add(E element)` Adds `element` to the multiset.
`int`	`count(E element)` Returns the number of occurrences of an element in this multiset.
`Set<E>`	`elementSet()` Returns a snapshot of the unique elements currently in this multiset.
`Iterator<E>`	`iterator()` Returns an iterator over a snapshot of all the elements currently in this multiset (including duplicates).
`void`	`remove(E element)` Removes `element` from the multiset.

Inherited methods

From java.lang.Iterable

`void`	`forEach(Consumer<T> action)`
`Spliterator<T>`	`spliterator()`

Public constructors

CopyOnWriteMultiset

public CopyOnWriteMultiset()

Public methods

add

public void add(E element)

Adds element to the multiset.

Parameters
`E element`	The element to be added.

count

public int count(E element)

Returns the number of occurrences of an element in this multiset.

elementSet

public Set<E> elementSet()

Returns a snapshot of the unique elements currently in this multiset.

Changes to the underlying multiset are not reflected in the returned value.

Returns
`Set<E>`	An unmodifiable set containing the unique elements in this multiset.

iterator

public Iterator<E> iterator()

Returns an iterator over a snapshot of all the elements currently in this multiset (including duplicates).

Changes to the underlying multiset are not reflected in the returned value.

Returns
`Iterator<E>`	An unmodifiable iterator over all the elements in this multiset (including duplicates).

remove

public void remove(E element)

Removes element from the multiset.

Parameters
`E element`	The element to be removed.