org.compass.core.util
Class IdentityHashSet<E>

java.lang.Object
  extended by java.util.AbstractCollection<E>
      extended by java.util.AbstractSet<E>
          extended by org.compass.core.util.IdentityHashSet<E>
All Implemented Interfaces:
Iterable<E>, Collection<E>, Set<E>

public class IdentityHashSet<E>
extends AbstractSet<E>

Author:
kimchy

Constructor Summary
IdentityHashSet()
          Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75).
 
Method Summary
 boolean add(E o)
          Adds the specified element to this set if it is not already present.
 void clear()
          Removes all of the elements from this set.
 Object clone()
          Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.
 boolean contains(Object o)
          Returns true if this set contains the specified element.
 boolean isEmpty()
          Returns true if this set contains no elements.
 Iterator<E> iterator()
          Returns an iterator over the elements in this set.
 boolean remove(Object o)
          Removes the specified element from this set if it is present.
 int size()
          Returns the number of elements in this set (its cardinality).
 
Methods inherited from class java.util.AbstractSet
equals, hashCode, removeAll
 
Methods inherited from class java.util.AbstractCollection
addAll, containsAll, retainAll, toArray, toArray, toString
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.util.Set
addAll, containsAll, retainAll, toArray, toArray
 

Constructor Detail

IdentityHashSet

public IdentityHashSet()
Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75).

Method Detail

iterator

public Iterator<E> iterator()
Returns an iterator over the elements in this set. The elements are returned in no particular order.

Specified by:
iterator in interface Iterable<E>
Specified by:
iterator in interface Collection<E>
Specified by:
iterator in interface Set<E>
Specified by:
iterator in class AbstractCollection<E>
Returns:
an Iterator over the elements in this set.
See Also:
ConcurrentModificationException

size

public int size()
Returns the number of elements in this set (its cardinality).

Specified by:
size in interface Collection<E>
Specified by:
size in interface Set<E>
Specified by:
size in class AbstractCollection<E>
Returns:
the number of elements in this set (its cardinality).

isEmpty

public boolean isEmpty()
Returns true if this set contains no elements.

Specified by:
isEmpty in interface Collection<E>
Specified by:
isEmpty in interface Set<E>
Overrides:
isEmpty in class AbstractCollection<E>
Returns:
true if this set contains no elements.

contains

public boolean contains(Object o)
Returns true if this set contains the specified element.

Specified by:
contains in interface Collection<E>
Specified by:
contains in interface Set<E>
Overrides:
contains in class AbstractCollection<E>
Parameters:
o - element whose presence in this set is to be tested.
Returns:
true if this set contains the specified element.

add

public boolean add(E o)
Adds the specified element to this set if it is not already present.

Specified by:
add in interface Collection<E>
Specified by:
add in interface Set<E>
Overrides:
add in class AbstractCollection<E>
Parameters:
o - element to be added to this set.
Returns:
true if the set did not already contain the specified element.

remove

public boolean remove(Object o)
Removes the specified element from this set if it is present.

Specified by:
remove in interface Collection<E>
Specified by:
remove in interface Set<E>
Overrides:
remove in class AbstractCollection<E>
Parameters:
o - object to be removed from this set, if present.
Returns:
true if the set contained the specified element.

clear

public void clear()
Removes all of the elements from this set.

Specified by:
clear in interface Collection<E>
Specified by:
clear in interface Set<E>
Overrides:
clear in class AbstractCollection<E>

clone

public Object clone()
Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.

Overrides:
clone in class Object
Returns:
a shallow copy of this set.


Copyright (c) 2004-2009 The Compass Project.