com.atlassian.jira.util.collect
Class IdentitySet<T>

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractSet<T>
          com.atlassian.jira.util.collect.IdentitySet<T>

All Implemented Interfaces:

java.lang.Iterable<T>, java.util.Collection<T>, java.util.Set<T>

public final class IdentitySet<T>
extends java.util.AbstractSet<T>
implements java.util.Set<T>

A Set implementation that considers objects equal if an only if they are the same instance. The Object.equals(Object) and Object.hashCode() methods of the stored objects are ignored.

This implementation uses another Set to store IdentitySet.IdentityReference objects for each object in the set.

Nested Class Summary

static class

IdentitySet.IdentityReference<T> Stores a reference to any Object.

Constructor Summary

IdentitySet(java.util.Set<IdentitySet.IdentityReference<T>> delegateSet)
Create a new set using the passed set as the store.

Method Summary

boolean	add(T t)
boolean	addAll(java.util.Collection<? extends T> c)
void	clear()
boolean	contains(java.lang.Object o)
boolean	containsAll(java.util.Collection<?> c)
boolean	isEmpty()
java.util.Iterator<T>	iterator()
static <T> IdentitySet<T>	newListOrderedSet() Create a new identity set.
static <T> IdentitySet<T>	newSet() Create a new identity set.
boolean	remove(java.lang.Object o)
boolean	removeAll(java.util.Collection<?> c)
boolean	retainAll(java.util.Collection<?> c)
int	size()
java.lang.String	toString()

Methods inherited from class java.util.AbstractSet

equals, hashCode

Methods inherited from class java.util.AbstractCollection

toArray, toArray

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Set

equals, hashCode, toArray, toArray

Constructor Detail

IdentitySet

public IdentitySet(java.util.Set<IdentitySet.IdentityReference<T>> delegateSet)

Create a new set using the passed set as the store. The passed set should not be used by the caller while the new IdentitySet is in use.

Parameters:

delegateSet - the set actually store the objects.

Method Detail

newSet

public static <T> IdentitySet<T> newSet()

Create a new identity set.

Type Parameters:

T - the objects to be stored in the identity set.

Returns:

the new set.

newListOrderedSet

public static <T> IdentitySet<T> newListOrderedSet()

Create a new identity set. The elements in the returned set will be stored in addition order.

Type Parameters:

T - the objects to be stored in the identity set.

Returns:

the new set.

clear

public void clear()

Specified by:

clear in interface java.util.Collection<T>

Specified by:

clear in interface java.util.Set<T>

Overrides:

clear in class java.util.AbstractCollection<T>

iterator

public java.util.Iterator<T> iterator()

Specified by:

iterator in interface java.lang.Iterable<T>

Specified by:

iterator in interface java.util.Collection<T>

Specified by:

iterator in interface java.util.Set<T>

Specified by:

iterator in class java.util.AbstractCollection<T>

add

public boolean add(T t)

Specified by:

add in interface java.util.Collection<T>

Specified by:

add in interface java.util.Set<T>

Overrides:

add in class java.util.AbstractCollection<T>

remove

public boolean remove(java.lang.Object o)

Specified by:

remove in interface java.util.Collection<T>

Specified by:

remove in interface java.util.Set<T>

Overrides:

remove in class java.util.AbstractCollection<T>

containsAll

public boolean containsAll(java.util.Collection<?> c)

Specified by:

containsAll in interface java.util.Collection<T>

Specified by:

containsAll in interface java.util.Set<T>

Overrides:

containsAll in class java.util.AbstractCollection<T>

addAll

public boolean addAll(java.util.Collection<? extends T> c)

Specified by:

addAll in interface java.util.Collection<T>

Specified by:

addAll in interface java.util.Set<T>

Overrides:

addAll in class java.util.AbstractCollection<T>

retainAll

public boolean retainAll(java.util.Collection<?> c)

Specified by:

retainAll in interface java.util.Collection<T>

Specified by:

retainAll in interface java.util.Set<T>

Overrides:

retainAll in class java.util.AbstractCollection<T>

removeAll

public boolean removeAll(java.util.Collection<?> c)

Specified by:

removeAll in interface java.util.Collection<T>

Specified by:

removeAll in interface java.util.Set<T>

Overrides:

removeAll in class java.util.AbstractSet<T>

size

public int size()

Specified by:

size in interface java.util.Collection<T>

Specified by:

size in interface java.util.Set<T>

Specified by:

size in class java.util.AbstractCollection<T>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection<T>

Specified by:

isEmpty in interface java.util.Set<T>

Overrides:

isEmpty in class java.util.AbstractCollection<T>

contains

public boolean contains(java.lang.Object o)

Specified by:

contains in interface java.util.Collection<T>

Specified by:

contains in interface java.util.Set<T>

Overrides:

contains in class java.util.AbstractCollection<T>

toString

public java.lang.String toString()

Overrides:

toString in class java.util.AbstractCollection<T>