org.apache.jdo.impl.sco
Class HashSet

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractSet
          java.util.HashSet
              org.apache.jdo.impl.sco.HashSet

All Implemented Interfaces:

java.lang.Cloneable, java.util.Collection, SCO, SCOCollection, java.io.Serializable, java.util.Set

public class HashSet

extends java.util.HashSet

implements SCOCollection

A mutable 2nd class object that represents HashSet.

Version:

1.0.1

Author:

Marina Vatkina

See Also:

HashSet, Serialized Form

Constructor Summary

HashSet(java.lang.Class elementType, boolean allowNulls)
Creates a new empty HashSet object.

HashSet(java.lang.Class elementType, boolean allowNulls, int initialCapacity)
Creates a new empty HashSet object that has the specified initial capacity.

HashSet(java.lang.Class elementType, boolean allowNulls, int initialCapacity, float loadFactor)
Creates a new empty HashSet object that has the specified initial capacity..

Method Summary

boolean	add(java.lang.Object o) Adds the specified element to this set if it is not already present.
boolean	addAll(java.util.Collection c) Adds all of the elements in the specified collection to this collection
void	addAllInternal(java.util.Collection c) Adds objects of the given Collection to this Collection without recording the event.
void	addInternal(java.lang.Object o) Adds object to the Collection without recording the event.
boolean	allowNulls() Returns whether nulls are permitted as elements.
void	clear() Removes all of the elements from this set.
void	clearInternal() Clears Collection without recording the event.
java.lang.Object	clone() Creates and returns a copy of this object.
boolean	contains(java.lang.Object o)
boolean	containsAll(java.util.Collection c)
java.util.Iterator	eitherIterator() Create an iterator regardless whether the collection is frozen.
boolean	equals(java.lang.Object o)
java.util.Iterator	frozenIterator() Create a new iterator over the frozen elements without thawing.
java.util.Collection	getAdded() Returns the Collection of added elements
java.lang.Class	getElementType() Returns the element type assignment compatible with all added elements of this collection.
java.lang.String	getFieldName() Returns the field name
java.lang.Object	getOwner() Returns the owner object of the SCO instance
java.util.Collection	getRemoved() Returns the Collection of removed elements
int	hashCode()
boolean	isEmpty()
java.util.Iterator	iterator()
boolean	remove(java.lang.Object o) Removes the given element from this set if it is present.
boolean	removeAll(java.util.Collection c) Removes from this collection all of its elements that are contained in the specified collection (optional operation).
void	removeInternal(java.lang.Object o) Removes element from the Collection without recording the event.
void	reset() Resets removed and added lists after flush
boolean	retainAll(java.util.Collection c) Retains only the elements in this collection that are contained in the specified collection (optional operation).
void	setFrozen(java.lang.Object[] elements) Set the contents of this Collection from the frozen elements, if this Collection is implicitly user-orderable.
void	setOwner(java.lang.Object owner, int fieldNumber) Sets the owner and field number.
int	size()
java.lang.Object[]	toArray()
java.lang.Object[]	toArray(java.lang.Object[] a)
java.lang.String	toString()
void	unsetOwner(java.lang.Object owner, int fieldNumber) Nullifies references to the owner Object iff the passed in owner and fieldNumber match.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashSet

public HashSet(java.lang.Class elementType,
               boolean allowNulls)

Creates a new empty HashSet object.

Parameters:

elementType - the element types allowed

allowNulls - true if nulls are allowed

See Also:

HashSet

HashSet

public HashSet(java.lang.Class elementType,
               boolean allowNulls,
               int initialCapacity)

Creates a new empty HashSet object that has the specified initial capacity.

Parameters:

elementType - the element types allowed

allowNulls - true if nulls are allowed

initialCapacity - the initial capacity of the hash map.

Throws:

java.lang.IllegalArgumentException - if the initial capacity is less than zero.

See Also:

HashSet

HashSet

public HashSet(java.lang.Class elementType,
               boolean allowNulls,
               int initialCapacity,
               float loadFactor)

Creates a new empty HashSet object that has the specified initial capacity..

Parameters:

elementType - the element types allowed

allowNulls - true if nulls are allowed

initialCapacity - the initial capacity of the hash map.

loadFactor - the load factor of the hash map.

Throws:

java.lang.IllegalArgumentException - if the initial capacity is less than zero.

See Also:

HashSet

Method Detail

add

public boolean add(java.lang.Object o)

Adds the specified element to this set if it is not already present.

Specified by:

add in interface java.util.Collection

Parameters:

o - element to be added to this set.

Returns:

true if the set did not already contain the specified element.

See Also:

HashSet

addAll

public boolean addAll(java.util.Collection c)

Adds all of the elements in the specified collection to this collection

Specified by:

addAll in interface java.util.Collection

Parameters:

c - collection whose elements are to be added to this collection.

Returns:

true if this collection changed as a result of the call.

Throws:

java.lang.UnsupportedOperationException - if the addAll method is not supported by this collection.

See Also:

AbstractCollection, HashSet

remove

public boolean remove(java.lang.Object o)

Removes the given element from this set if it is present.

Specified by:

remove in interface java.util.Collection

Parameters:

o - object to be removed from this set, if present.

Returns:

true if the set contained the specified element.

See Also:

HashSet

removeAll

public boolean removeAll(java.util.Collection c)

Removes from this collection all of its elements that are contained in the specified collection (optional operation).

Processes each element remove internally not to have call backs into #remove(Object).

Specified by:

removeAll in interface java.util.Collection

Parameters:

c - elements to be removed from this collection.

Returns:

true if this collection changed as a result of the call.

Throws:

java.lang.UnsupportedOperationException - removeAll is not supported by this collection.

See Also:

HashSet, AbstractCollection

retainAll

public boolean retainAll(java.util.Collection c)

Retains only the elements in this collection that are contained in the specified collection (optional operation).

Specified by:

retainAll in interface java.util.Collection

Returns:

true if this collection changed as a result of the call.

Throws:

java.lang.UnsupportedOperationException - if the retainAll method is not supported by this collection.

See Also:

HashSet, AbstractCollection

clear

public void clear()

Removes all of the elements from this set.

Specified by:

clear in interface java.util.Collection

See Also:

HashSet

clone

public java.lang.Object clone()

Creates and returns a copy of this object.

Mutable Second Class Objects are required to provide a public clone method in order to allow for copying PersistenceCapable objects. In contrast to Object.clone(), this method must not throw a CloneNotSupportedException.

Specified by:

clone in interface SCO

reset

public void reset()

Description copied from interface: SCOCollection

Resets removed and added lists after flush

Specified by:

reset in interface SCOCollection

See Also:

SCOCollection.reset()

addInternal

public void addInternal(java.lang.Object o)

Description copied from interface: SCOCollection

Adds object to the Collection without recording the event. Used internaly to initially populate the Collection

Specified by:

addInternal in interface SCOCollection

See Also:

SCOCollection.addInternal(Object o)

addAllInternal

public void addAllInternal(java.util.Collection c)

Description copied from interface: SCOCollection

Adds objects of the given Collection to this Collection without recording the event. Used internaly to initially populate the Collection

Specified by:

addAllInternal in interface SCOCollection

See Also:

SCOCollection.addAllInternal(Collection c)

getAdded

public java.util.Collection getAdded()

Description copied from interface: SCOCollection

Returns the Collection of added elements

Specified by:

getAdded in interface SCOCollection

Returns:

Collection of the added elements as java.util.Collection

See Also:

SCOCollection.getAdded()

getRemoved

public java.util.Collection getRemoved()

Description copied from interface: SCOCollection

Returns the Collection of removed elements

Specified by:

getRemoved in interface SCOCollection

Returns:

Collection of the removed elements as java.util.Collection

See Also:

SCOCollection.getRemoved()

clearInternal

public void clearInternal()

Description copied from interface: SCOCollection

Clears Collection without recording the event. Used internaly to clear the Collection

Specified by:

clearInternal in interface SCOCollection

See Also:

SCOCollection.clearInternal()

removeInternal

public void removeInternal(java.lang.Object o)

Description copied from interface: SCOCollection

Removes element from the Collection without recording the event. Used internaly to update the Collection

Specified by:

removeInternal in interface SCOCollection

See Also:

SCOCollection.removeInternal(Object o)

unsetOwner

public void unsetOwner(java.lang.Object owner,
                       int fieldNumber)

Description copied from interface: SCO

Nullifies references to the owner Object iff the passed in owner and fieldNumber match.

Specified by:

unsetOwner in interface SCO

Parameters:

owner - the existing owner object.

fieldNumber - the existing number of the field.

See Also:

SCO.unsetOwner(Object owner, int fieldNumber)

setOwner

public void setOwner(java.lang.Object owner,
                     int fieldNumber)

Description copied from interface: SCO

Sets the owner and field number. Called by StateManager upon assignment to a managed instance.

Specified by:

setOwner in interface SCO

Parameters:

owner - the owner object.

fieldNumber - the number of the field associated with this instance.

See Also:

(Object owner, int fieldNumber)

getOwner

public java.lang.Object getOwner()

Description copied from interface: SCO

Returns the owner object of the SCO instance

Specified by:

getOwner in interface SCO

Returns:

owner object

See Also:

SCO.getOwner()

getFieldName

public java.lang.String getFieldName()

Description copied from interface: SCO

Returns the field name

Specified by:

getFieldName in interface SCO

Returns:

field name as java.lang.String

See Also:

SCO.getFieldName()

getElementType

public java.lang.Class getElementType()

Description copied from interface: SCOCollection

Returns the element type assignment compatible with all added elements of this collection.

Specified by:

getElementType in interface SCOCollection

Returns:

the element type assignment compatible with all added elements.

See Also:

{

allowNulls

public boolean allowNulls()

Description copied from interface: SCOCollection

Returns whether nulls are permitted as elements.

Specified by:

allowNulls in interface SCOCollection

Returns:

true if nulls are permitted as elements.

See Also:

{

contains

public boolean contains(java.lang.Object o)

Specified by:

contains in interface java.util.Collection

containsAll

public boolean containsAll(java.util.Collection c)

Specified by:

containsAll in interface java.util.Collection

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection

iterator

public java.util.Iterator iterator()

Specified by:

iterator in interface java.util.Collection

size

public int size()

Specified by:

size in interface java.util.Collection

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Collection

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Collection

toString

public java.lang.String toString()

toArray

public java.lang.Object[] toArray()

Specified by:

toArray in interface java.util.Collection

toArray

public java.lang.Object[] toArray(java.lang.Object[] a)

Specified by:

toArray in interface java.util.Collection

setFrozen

public void setFrozen(java.lang.Object[] elements)

Set the contents of this Collection from the frozen elements, if this Collection is implicitly user-orderable.

Specified by:

setFrozen in interface SCOCollection

Parameters:

elements - the frozen elements of this set.

Since:

1.0.1

frozenIterator

public java.util.Iterator frozenIterator()

Create a new iterator over the frozen elements without thawing.

Specified by:

frozenIterator in interface SCOCollection

Returns:

the frozen iterator.

Since:

1.0.1

eitherIterator

public java.util.Iterator eitherIterator()

Create an iterator regardless whether the collection is frozen. If frozen, don't thaw the collection, but get a frozen iterator. If thawed, get a regular iterator.

Specified by:

eitherIterator in interface SCOCollection

Returns:

the iterator.

Since:

1.0.1