Module org.eclipse.persistence.core

Package org.eclipse.persistence.internal.helper

Class IdentityHashSet

java.lang.Object

java.util.AbstractCollection

org.eclipse.persistence.internal.helper.IdentityHashSet

All Implemented Interfaces:

Serializable, Cloneable, Iterable, Collection, Set

public class IdentityHashSet
extends AbstractCollection
implements Set, Cloneable, Serializable

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	count
protected float	loadFactor
protected int	threshold

Constructor Summary

Constructors

Constructor	Description
IdentityHashSet()	Constructs a new IdentityHashSet with a default initial capacity of 32 and a loadfactor of 0.75.
IdentityHashSet(int initialCapacity)	Constructs a new IdentityHashSet with the given initial capacity and a default loadFactor of 0.75.
IdentityHashSet(int initialCapacity, float loadFactor)	Constructs a new IdentityHashSet with the given initial capacity and the given loadFactor.
IdentityHashSet(Collection c)	Constructs a new IdentityHashSet with the same contents as the given Collection.

Method Summary

Modifier and Type	Method	Description
boolean	add(Object obj)	Adds the given object to this IdentityHashSet.
void	clear()	Removes all of the objects from this IdentityHashSet.
Object	clone()	Returns a shallow copy of this IdentityHashSet (the elements are not cloned).
boolean	contains(Object obj)	Returns true if this IdentityHashSet contains the given object.
boolean	isEmpty()
Iterator	iterator()	Get an iterator for this IdentityHashSet
boolean	remove(Object obj)	Removes the given object from this IdentityHashSet, if present.
boolean	removeAll(Collection c)	This implementation throws an UnsupportedOperationException because removeAll does not work correctly with reference equality testing.
boolean	retainAll(Collection c)	This implementation throws an UnsupportedOperationException.
int	size()

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.Set

addAll, containsAll, equals, hashCode, spliterator, toArray, toArray

Field Detail

count

protected transient int count

threshold

protected int threshold

loadFactor

protected float loadFactor

Constructor Detail

IdentityHashSet

public IdentityHashSet(int initialCapacity,
                       float loadFactor)

Constructs a new IdentityHashSet with the given initial capacity and the given loadFactor.

Parameters:

initialCapacity - the initial capacity of the IdentityHashSet.

loadFactor - the loadFactor of the IdentityHashSet.

Throws:

IllegalArgumentException - if the initial capacity is less than zero, or if the loadFactor is nonpositive.

IdentityHashSet

public IdentityHashSet(int initialCapacity)

Constructs a new IdentityHashSet with the given initial capacity and a default loadFactor of 0.75.

Parameters:

initialCapacity - the initial capacity of the IdentityHashSet.

Throws:

IllegalArgumentException - if the initial capacity is less than zero.

IdentityHashSet

public IdentityHashSet()

Constructs a new IdentityHashSet with a default initial capacity of 32 and a loadfactor of 0.75.

IdentityHashSet

public IdentityHashSet(Collection c)

Constructs a new IdentityHashSet with the same contents as the given Collection. The new IdentityHashSet is created with an initial capacity sufficient to hold the elements of the given Collection.

Parameters:

c - the Collection whose contents are to be placed in the new IdentityHashSet.

Method Detail

size

public int size()

Specified by:

size in interface Collection

Specified by:

size in interface Set

Specified by:

size in class AbstractCollection

Returns:

the size of this IdentityHashSet.

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection

Specified by:

isEmpty in interface Set

Overrides:

isEmpty in class AbstractCollection

Returns:

true if this IdentityHashSet is empty.

contains

public boolean contains(Object obj)

Returns true if this IdentityHashSet contains the given object.

Specified by:

contains in interface Collection

Specified by:

contains in interface Set

Overrides:

contains in class AbstractCollection

Parameters:

obj - the object to find.

Returns:

true if this IdentityHashSet contains obj by reference.

add

public boolean add(Object obj)

Adds the given object to this IdentityHashSet.

Specified by:

add in interface Collection

Specified by:

add in interface Set

Overrides:

add in class AbstractCollection

Parameters:

obj - object to add.

Returns:

true if this IdentityHashSet did not already contain obj.

Throws:

NullPointerException - if obj is null.

remove

public boolean remove(Object obj)

Removes the given object from this IdentityHashSet, if present.

Specified by:

remove in interface Collection

Specified by:

remove in interface Set

Overrides:

remove in class AbstractCollection

Parameters:

obj - the object to be removed from this IdentityHashSet.

Returns:

true if this IdentityHashSet contained obj.

removeAll

public boolean removeAll(Collection c)

This implementation throws an UnsupportedOperationException because removeAll does not work correctly with reference equality testing.

Specified by:

removeAll in interface Collection

Specified by:

removeAll in interface Set

Overrides:

removeAll in class AbstractCollection

retainAll

public boolean retainAll(Collection c)

This implementation throws an UnsupportedOperationException. The Javadocs for AbstractCollection indicates that retainAll is an optional method.

Specified by:

retainAll in interface Collection

Specified by:

retainAll in interface Set

Overrides:

retainAll in class AbstractCollection

clear

public void clear()

Removes all of the objects from this IdentityHashSet.

Specified by:

clear in interface Collection

Specified by:

clear in interface Set

Overrides:

clear in class AbstractCollection

clone

public Object clone()

Returns a shallow copy of this IdentityHashSet (the elements are not cloned).

Overrides:

clone in class Object

Returns:

a shallow copy of this IdentityHashSet.

iterator

public Iterator iterator()

Get an iterator for this IdentityHashSet

Specified by:

iterator in interface Collection

Specified by:

iterator in interface Iterable

Specified by:

iterator in interface Set

Specified by:

iterator in class AbstractCollection