ConcurrentHashSet

net.i2p.util.ConcurrentHashSet<E>

Type Parameters:: E - type of elements in this set

All Implemented Interfaces:: Iterable<E>, Collection<E>, Set<E>

public class ConcurrentHashSet<E>extends AbstractSet<E> implements Set<E>

Implement on top of a ConcurrentHashMap with a dummy value.

Field Summary
Fields
Modifier and Type
Field
Description
private final Map<E,Object>
_map
The backing map holding the set's elements.
private static final Object
DUMMY
Placeholder value - only the map's keys matter
Constructor Summary
Constructors
Constructor
Description
ConcurrentHashSet()
Create a new ConcurrentHashSet.
ConcurrentHashSet(int capacity)
Create a new ConcurrentHashSet with the given capacity.
Method Summary
All Methods
Modifier and Type
Method
Description
boolean
add(E o)

boolean
addAll(Collection<? extends E> c)

void
clear()

boolean
contains(Object o)

boolean
isEmpty()

Iterator<E>
iterator()

boolean
remove(Object o)

int
size()

Methods inherited from class AbstractSet
equals, hashCode, removeAll
Methods inherited from class AbstractCollection
containsAll, retainAll, toArray, toArray, toString
Methods inherited from class Object
clone, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface Collection
parallelStream, removeIf, stream, toArray
Methods inherited from interface Iterable
forEach
Methods inherited from interface Set
containsAll, retainAll, spliterator, toArray, toArray

Field Details
- DUMMY
  private static final Object DUMMY
  Placeholder value - only the map's keys matter
- _map
  private final Map<E,Object> _map
  The backing map holding the set's elements.
Constructor Details
- ConcurrentHashSet
  public ConcurrentHashSet()
  Create a new ConcurrentHashSet.
- ConcurrentHashSet
  public ConcurrentHashSet(int capacity)
  Create a new ConcurrentHashSet with the given capacity.
  Parameters:
  capacity - the initial capacity
Method Details
- add
  public boolean add(E o)
  Specified by:
  add in interface Collection<E>
  Specified by:
  add in interface Set<E>
  Overrides:
  add in class AbstractCollection<E>
- clear
  public void clear()
  Specified by:
  clear in interface Collection<E>
  Specified by:
  clear in interface Set<E>
  Overrides:
  clear in class AbstractCollection<E>
- contains
  public boolean contains(Object o)
  Specified by:
  contains in interface Collection<E>
  Specified by:
  contains in interface Set<E>
  Overrides:
  contains in class AbstractCollection<E>
- isEmpty
  public boolean isEmpty()
  Specified by:
  isEmpty in interface Collection<E>
  Specified by:
  isEmpty in interface Set<E>
  Overrides:
  isEmpty in class AbstractCollection<E>
- remove
  public boolean remove(Object o)
  Specified by:
  remove in interface Collection<E>
  Specified by:
  remove in interface Set<E>
  Overrides:
  remove in class AbstractCollection<E>
- size
  public int size()
  Specified by:
  size in interface Collection<E>
  Specified by:
  size in interface Set<E>
  Specified by:
  size in class AbstractCollection<E>
- iterator
  public Iterator<E> iterator()
  Specified by:
  iterator in interface Collection<E>
  Specified by:
  iterator in interface Iterable<E>
  Specified by:
  iterator in interface Set<E>
  Specified by:
  iterator in class AbstractCollection<E>
- addAll
  public boolean addAll(Collection<? extends E> c)
  Specified by:
  addAll in interface Collection<E>
  Specified by:
  addAll in interface Set<E>
  Overrides:
  addAll in class AbstractCollection<E>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class AbstractSet

Methods inherited from class AbstractCollection

Methods inherited from class Object

Methods inherited from interface Collection

Methods inherited from interface Iterable

Methods inherited from interface Set

Field Details

DUMMY

_map

Constructor Details

ConcurrentHashSet

Method Details

add

clear

contains

isEmpty

remove

size

iterator

addAll