org.jpox.sco
Class HashSet

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractSet<E>
          java.util.HashSet
              org.jpox.sco.HashSet

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Iterable, java.util.Collection, java.util.Set, SCO, SCOCollection, SCOLazyLoading, SCOMtoN, Queryable

public class HashSet
extends java.util.HashSet
implements SCOCollection, SCOMtoN, SCOLazyLoading, java.lang.Cloneable, Queryable

A mutable second-class HashSet object. Backed by a SetStore object. Allows caching in the delegate of the elements of the HashSet. This can be enabled globally for the PMF, or individually for this particular HashSet.

Version:

$Revision: 1.56 $

See Also:

Serialized Form

Field Summary

protected CollectionStore	backingStore The "backing store"
protected java.util.HashSet	delegate The internal "delegate".
protected boolean	isCacheLoaded Status flag whether the collection is loaded into the cache.
protected boolean	useCache Whether to use caching.

Constructor Summary

HashSet(StateManager ownerSM, java.lang.String fieldName)
Constructor, using the StateManager of the "owner" and the field name.

Method Summary

boolean	add(java.lang.Object element) Method to add an element to the HashSet.
boolean	addAll(java.util.Collection c) Method to add a collection to the HashSet.
void	attachCopy(java.lang.Object value) Method to return an attached copy of the passed (detached) value.
void	clear() Method to clear the HashSet
java.lang.Object	clone() Creates and returns a copy of this object.
boolean	contains(java.lang.Object element) Accessor for whether an element is contained in this Set.
boolean	containsAll(java.util.Collection c) Accessor for whether a collection is contained in this Set.
void	detach(FetchPlanState state) Method to detach the PersistenceCapable elements of this container.
java.lang.Object	detachCopy(FetchPlanState state) Method to return a detached copy of the container.
boolean	equals(java.lang.Object o) Equality operator.
java.lang.Class	getElementType() Accessor for the element type.
java.lang.String	getFieldName() Accessor for the field name.
java.lang.Object	getOwner() Accessor for the owner object.
int	hashCode() Hashcode operator.
boolean	isEmpty() Accessor for whether the HashSet is empty.
java.util.Iterator	iterator() Accessor for an iterator for the Set.
void	load() Method to effect the load of the data in the SCO.
protected void	loadFromStore() Method to load all elements from the "backing store" where appropriate.
void	makeDirty() Utility to mark the object as dirty
void	makeTransient(FetchPlanState state) Method to make transient all elements of this container.
QueryExpression	newQueryStatement() Method to generate a QueryStatement for the SCO.
QueryExpression	newQueryStatement(java.lang.Class candidate_class) Method to return a QueryStatement, using the specified candidate class.
Query.ResultObjectFactory	newResultObjectFactory(QueryExpression stmt, boolean ignoreCache, java.lang.Class resultClass, boolean useFetchPlan) Method to return a ResultObjectFactory for the SCO.
boolean	remove(java.lang.Object element) Method to remove an element from the HashSet.
boolean	removeAll(java.util.Collection c) Method to remove all elements from the collection from the HashSet.
boolean	retainAll(java.util.Collection c) Method to retain a Collection of elements (and remove all others).
void	runReachability(java.util.Set reachables) Method to run reachability on this SCO.
void	setValueFrom(java.lang.Object o, boolean forUpdate) Mutator for setting using an object.
int	size() Accessor for the size of the HashSet.
java.lang.Object[]	toArray() Method to return the list as an array.
java.lang.Object[]	toArray(java.lang.Object[] a) Method to return the list as an array.
void	unsetOwner() Method to unset the owner and field information.
void	updateEmbeddedElement(java.lang.Object element, int fieldNumber, java.lang.Object value) Method to update an embedded element in this collection.
protected java.lang.Object	writeReplace() The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream.

Methods inherited from class java.util.AbstractCollection

toString

Methods inherited from class java.lang.Object

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

Field Detail

backingStore

protected CollectionStore backingStore

The "backing store"

delegate

protected java.util.HashSet delegate

The internal "delegate".

useCache

protected boolean useCache

Whether to use caching.

isCacheLoaded

protected boolean isCacheLoaded

Status flag whether the collection is loaded into the cache.

Constructor Detail

HashSet

public HashSet(StateManager ownerSM,
               java.lang.String fieldName)

Constructor, using the StateManager of the "owner" and the field name.

Parameters:

ownerSM - The owner StateManager

fieldName - The name of the field of the SCO.

Method Detail

getElementType

public java.lang.Class getElementType()

Accessor for the element type.

Specified by:

getElementType in interface SCOCollection

Returns:

the element type contained in the collection

load

public void load()

Method to effect the load of the data in the SCO. Used when the SCO supports lazy-loading to tell it to load all now.

Specified by:

load in interface SCOLazyLoading

updateEmbeddedElement

public void updateEmbeddedElement(java.lang.Object element,
                                  int fieldNumber,
                                  java.lang.Object value)

Method to update an embedded element in this collection.

Specified by:

updateEmbeddedElement in interface SCOCollection

Parameters:

element - The element

fieldNumber - Number of field in the element

value - New value for this field

setValueFrom

public void setValueFrom(java.lang.Object o,
                         boolean forUpdate)

Mutator for setting using an object.

Specified by:

setValueFrom in interface SCO

Parameters:

o - The object to set from

forUpdate - Whether to update the datastore with this value

getFieldName

public java.lang.String getFieldName()

Accessor for the field name.

Specified by:

getFieldName in interface SCO

Returns:

The field name

getOwner

public java.lang.Object getOwner()

Accessor for the owner object.

Specified by:

getOwner in interface SCO

Returns:

The owner object

unsetOwner

public void unsetOwner()

Method to unset the owner and field information.

Specified by:

unsetOwner in interface SCO

makeDirty

public void makeDirty()

Utility to mark the object as dirty

runReachability

public void runReachability(java.util.Set reachables)

Method to run reachability on this SCO.

Specified by:

runReachability in interface SCO

Parameters:

reachables - List of StateManagers reachable so far

makeTransient

public void makeTransient(FetchPlanState state)

Method to make transient all elements of this container. All elements that are PersistenceCapable will be made transient.

Specified by:

makeTransient in interface SCO

Parameters:

state - State for the fetchplan process

detach

public void detach(FetchPlanState state)

Method to detach the PersistenceCapable elements of this container.

Specified by:

detach in interface SCO

Parameters:

state - State for the detachment process

detachCopy

public java.lang.Object detachCopy(FetchPlanState state)

Method to return a detached copy of the container. Recurse sthrough the elements so that they are likewise detached.

Specified by:

detachCopy in interface SCO

Parameters:

state - State for detachment process

Returns:

The detached container

attachCopy

public void attachCopy(java.lang.Object value)

Method to return an attached copy of the passed (detached) value. The returned attached copy is a SCO wrapper. Goes through the existing elements in the store for this owner field and removes ones no longer present, and adds new elements. All elements in the (detached) value are attached.

Specified by:

attachCopy in interface SCO

Parameters:

value - The new (collection) value

newQueryStatement

public QueryExpression newQueryStatement()

Method to generate a QueryStatement for the SCO.

Specified by:

newQueryStatement in interface Queryable

Returns:

The QueryStatement

newQueryStatement

public QueryExpression newQueryStatement(java.lang.Class candidate_class)

Method to return a QueryStatement, using the specified candidate class.

Specified by:

newQueryStatement in interface Queryable

Parameters:

candidate_class - the candidate class

Returns:

The QueryStatement

See Also:

Queryable.newQueryStatement()

newResultObjectFactory

public Query.ResultObjectFactory newResultObjectFactory(QueryExpression stmt,
                                                        boolean ignoreCache,
                                                        java.lang.Class resultClass,
                                                        boolean useFetchPlan)

Method to return a ResultObjectFactory for the SCO.

Specified by:

newResultObjectFactory in interface Queryable

Parameters:

stmt - The QueryStatement

ignoreCache - Whether to ignore the cache

resultClass - Whether to create objects of a particular class

useFetchPlan - whether to use the fetch plan to retrieve fields in the same query

Returns:

The ResultObjectFactory

clone

public java.lang.Object clone()

Creates and returns a copy of this object.

Specified by:

clone in interface SCO

Overrides:

clone in class java.util.HashSet

Returns:

The cloned object

contains

public boolean contains(java.lang.Object element)

Accessor for whether an element is contained in this Set.

Specified by:

contains in interface java.util.Collection

Specified by:

contains in interface java.util.Set

Specified by:

contains in interface SCOMtoN

Overrides:

contains in class java.util.HashSet

Parameters:

element - The element

Returns:

Whether it is contained.

containsAll

public boolean containsAll(java.util.Collection c)

Accessor for whether a collection is contained in this Set.

Specified by:

containsAll in interface java.util.Collection

Specified by:

containsAll in interface java.util.Set

Overrides:

containsAll in class java.util.AbstractCollection

Parameters:

c - The collection

Returns:

Whether it is contained.

equals

public boolean equals(java.lang.Object o)

Equality operator.

Specified by:

equals in interface java.util.Collection

Specified by:

equals in interface java.util.Set

Overrides:

equals in class java.util.AbstractSet

Parameters:

o - The object to compare against.

Returns:

Whether this object is the same.

hashCode

public int hashCode()

Hashcode operator.

Specified by:

hashCode in interface java.util.Collection

Specified by:

hashCode in interface java.util.Set

Overrides:

hashCode in class java.util.AbstractSet

Returns:

The Hash code.

isEmpty

public boolean isEmpty()

Accessor for whether the HashSet is empty.

Specified by:

isEmpty in interface java.util.Collection

Specified by:

isEmpty in interface java.util.Set

Specified by:

isEmpty in interface Queryable

Overrides:

isEmpty in class java.util.HashSet

Returns:

Whether it is empty.

iterator

public java.util.Iterator iterator()

Accessor for an iterator for the Set.

Specified by:

iterator in interface java.lang.Iterable

Specified by:

iterator in interface java.util.Collection

Specified by:

iterator in interface java.util.Set

Overrides:

iterator in class java.util.HashSet

Returns:

The iterator

size

public int size()

Accessor for the size of the HashSet.

Specified by:

size in interface java.util.Collection

Specified by:

size in interface java.util.Set

Overrides:

size in class java.util.HashSet

Returns:

The size.

toArray

public java.lang.Object[] toArray()

Method to return the list as an array.

Specified by:

toArray in interface java.util.Collection

Specified by:

toArray in interface java.util.Set

Overrides:

toArray in class java.util.AbstractCollection

Returns:

The array

toArray

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

Method to return the list as an array.

Specified by:

toArray in interface java.util.Collection

Specified by:

toArray in interface java.util.Set

Overrides:

toArray in class java.util.AbstractCollection

Parameters:

a - The runtime types of the array being defined by this param

Returns:

The array

add

public boolean add(java.lang.Object element)

Method to add an element to the HashSet.

Specified by:

add in interface java.util.Collection

Specified by:

add in interface java.util.Set

Overrides:

add in class java.util.HashSet

Parameters:

element - The new element

Returns:

Whether it was added ok.

addAll

public boolean addAll(java.util.Collection c)

Method to add a collection to the HashSet.

Specified by:

addAll in interface java.util.Collection

Specified by:

addAll in interface java.util.Set

Overrides:

addAll in class java.util.AbstractCollection

Parameters:

c - The collection

Returns:

Whether it was added ok.

clear

public void clear()

Method to clear the HashSet

Specified by:

clear in interface java.util.Collection

Specified by:

clear in interface java.util.Set

Overrides:

clear in class java.util.HashSet

remove

public boolean remove(java.lang.Object element)

Method to remove an element from the HashSet.

Specified by:

remove in interface java.util.Collection

Specified by:

remove in interface java.util.Set

Overrides:

remove in class java.util.HashSet

Parameters:

element - The element

Returns:

Whether it was removed ok.

removeAll

public boolean removeAll(java.util.Collection c)

Method to remove all elements from the collection from the HashSet.

Specified by:

removeAll in interface java.util.Collection

Specified by:

removeAll in interface java.util.Set

Overrides:

removeAll in class java.util.AbstractSet

Parameters:

c - The collection of elements to remove

Returns:

Whether it was removed ok.

retainAll

public boolean retainAll(java.util.Collection c)

Method to retain a Collection of elements (and remove all others).

Specified by:

retainAll in interface java.util.Collection

Specified by:

retainAll in interface java.util.Set

Overrides:

retainAll in class java.util.AbstractCollection

Parameters:

c - The collection to retain

Returns:

Whether they were retained successfully.

writeReplace

protected java.lang.Object writeReplace()
                                 throws java.io.ObjectStreamException

The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream. The ObjectOutputStream checks whether the class defines the writeReplace method. If the method is defined, the writeReplace method is called to allow the object to designate its replacement in the stream. The object returned should be either of the same type as the object passed in or an object that when read and resolved will result in an object of a type that is compatible with all references to the object.

Returns:

the replaced object

Throws:

java.io.ObjectStreamException

loadFromStore

protected void loadFromStore()

Method to load all elements from the "backing store" where appropriate.