CopyOnWriteMultiset (ExoPlayer library)

java.lang.Object
- com.google.android.exoplayer2.util.CopyOnWriteMultiset<E>

Type Parameters:

E - The type of element being stored.

All Implemented Interfaces:

Iterable<E>
```
public final class CopyOnWriteMultiset<E>
extends Object
implements Iterable<E>
```
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 CopyOnWriteArrayList. 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.

Constructor Summary

Constructors
Constructor Description

CopyOnWriteMultiset()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Constructor Detail
  - CopyOnWriteMultiset
```
public CopyOnWriteMultiset()
```
- Method Detail
  - add
```
public void add(E element)
```
    Adds element to the multiset.
    
    Parameters:
    
    element - The element to be added.
  - remove
```
public void remove(E element)
```
    Removes element from the multiset.
    
    Parameters:
    
    element - The element to be removed.
  - 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:
    
    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.
    
    Specified by:
    
    iterator in interface Iterable<E>
    
    Returns:
    
    An unmodifiable iterator over all the elements in this multiset (including duplicates).
  - count
```
public int count(E element)
```
    Returns the number of occurrences of an element in this multiset.