org.datanucleus.sco.simple
Class LinkedList

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractList<E>
          java.util.AbstractSequentialList<E>
              java.util.LinkedList
                  org.datanucleus.sco.simple.LinkedList

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Iterable, java.util.Collection, java.util.Deque, java.util.List, java.util.Queue, SCO, SCOCollection, SCOContainer, SCOList

public class LinkedList
extends java.util.LinkedList
implements SCOList, java.lang.Cloneable

A mutable second-class LinkedList object. This is the simplified form that intercepts mutators and marks the field as dirty.

See Also:

Serialized Form

Field Summary

protected boolean	allowNulls
protected java.util.LinkedList	delegate The internal "delegate".
protected java.lang.String	fieldName
protected int	fieldNumber
protected static Localiser	LOCALISER
protected java.lang.Object	owner
protected StateManager	ownerSM

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

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

Method Summary

void	add(int index, java.lang.Object element) Method to add an element to a position in the LinkedList.
boolean	add(java.lang.Object element) Method to add an element to the LinkedList.
boolean	addAll(java.util.Collection elements) Method to add a Collection to the LinkedList.
boolean	addAll(int index, java.util.Collection elements) Method to add a Collection to a position in the LinkedList.
void	addFirst(java.lang.Object element) Method to add an element as first in the LinkedList.
void	addLast(java.lang.Object element) Method to add an element as last in the LinkedList.
void	attachCopy(java.lang.Object value) Method to return an attached copy of the passed (detached) value.
void	clear() Method to clear the LinkedList.
java.lang.Object	clone() Clone operator to return a copy of this object.
boolean	contains(java.lang.Object element) Method to return if the list contains this element.
boolean	containsAll(java.util.Collection c) Accessor for whether a collection of elements are contained here.
java.lang.Object	detachCopy(FetchPlanState state) Method to return a detached copy of the container.
boolean	equals(java.lang.Object o) Equality operator.
void	flush() Method to flush the changes to the datastore when operating in queued mode.
java.lang.Object	get(int index) Method to retrieve an element no.
java.lang.String	getFieldName() Accessor for the field name.
java.lang.Object	getFirst() Method to retrieve the first element.
java.lang.Object	getLast() Method to retrieve the last element.
java.lang.Object	getOwner() Accessor for the owner object.
java.lang.Object	getValue() Accessor for the unwrapped value that we are wrapping.
int	hashCode() Hashcode operator.
int	indexOf(java.lang.Object element) Method to the position of an element.
void	initialise() Method to initialise the SCO for use.
void	initialise(java.lang.Object o, boolean forInsert, boolean forUpdate) Method to initialise the SCO from an existing value.
boolean	isEmpty() Accessor for whether the LinkedList is empty.
boolean	isLoaded() Method to return if the SCO has its contents loaded.
java.util.Iterator	iterator() Method to retrieve an iterator for the list.
int	lastIndexOf(java.lang.Object element) Method to retrieve the last position of the element.
java.util.ListIterator	listIterator(int index) Method to retrieve a List iterator for the list from the index.
void	load() Method to effect the load of the data in the SCO.
void	makeDirty() Utility to mark the object as dirty.
java.lang.Object	remove(int index) Method to remove an element from the LinkedList.
boolean	remove(java.lang.Object element) Method to remove an element from the List
boolean	remove(java.lang.Object element, boolean allowCascadeDelete) Method to remove an element from the List
boolean	removeAll(java.util.Collection elements) Method to remove a Collection from the LinkedList.
java.lang.Object	removeFirst() Method to remove the first element from the LinkedList.
java.lang.Object	removeLast() Method to remove the last element from the LinkedList.
boolean	retainAll(java.util.Collection c) Method to retain a Collection of elements (and remove all others).
java.lang.Object	set(int index, java.lang.Object element) Method to set the element at a position in the LinkedList.
java.lang.Object	set(int index, java.lang.Object element, boolean allowDependentField) JPOX wrapper addition that allows turning off of the dependent-field checks when doing the position setting.
int	size() Accessor for the size of the LinkedList.
java.util.List	subList(int from, int to) Accessor for the subList of elements between from and to of the List
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.LinkedList

descendingIterator, element, offer, offerFirst, offerLast, peek, peekFirst, peekLast, poll, pollFirst, pollLast, pop, push, remove, removeFirstOccurrence, removeLastOccurrence

Methods inherited from class java.util.AbstractList

listIterator, removeRange

Methods inherited from class java.util.AbstractCollection

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

listIterator

Field Detail

LOCALISER

protected static final Localiser LOCALISER

owner

protected transient java.lang.Object owner

ownerSM

protected transient StateManager ownerSM

fieldName

protected transient java.lang.String fieldName

fieldNumber

protected transient int fieldNumber

allowNulls

protected transient boolean allowNulls

delegate

protected java.util.LinkedList delegate

The internal "delegate".

Constructor Detail

LinkedList

public LinkedList(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

initialise

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

Method to initialise the SCO from an existing value.

Specified by:

initialise in interface SCO

Parameters:

o - The object to set from

forInsert - Whether the object needs inserting in the datastore with this value

forUpdate - Whether to update the datastore with this value

initialise

public void initialise()

Method to initialise the SCO for use.

Specified by:

initialise in interface SCO

getValue

public java.lang.Object getValue()

Accessor for the unwrapped value that we are wrapping.

Specified by:

getValue in interface SCO

Returns:

The unwrapped value

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 SCOContainer

isLoaded

public boolean isLoaded()

Method to return if the SCO has its contents loaded. Returns true.

Specified by:

isLoaded in interface SCOContainer

Returns:

Whether it is loaded

flush

public void flush()

Method to flush the changes to the datastore when operating in queued mode. Does nothing in "direct" mode.

Specified by:

flush in interface SCOContainer

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

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.

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

clone

public java.lang.Object clone()

Clone operator to return 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

Overrides:

clone in class java.util.LinkedList

Returns:

The cloned object

contains

public boolean contains(java.lang.Object element)

Method to return if the list contains this element.

Specified by:

contains in interface java.util.Collection

Specified by:

contains in interface java.util.Deque

Specified by:

contains in interface java.util.List

Overrides:

contains in class java.util.LinkedList

Parameters:

element - The element

Returns:

Whether it is contained

containsAll

public boolean containsAll(java.util.Collection c)

Accessor for whether a collection of elements are contained here.

Specified by:

containsAll in interface java.util.Collection

Specified by:

containsAll in interface java.util.List

Overrides:

containsAll in class java.util.AbstractCollection

Parameters:

c - The collection of elements.

Returns:

Whether they are 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.List

Overrides:

equals in class java.util.AbstractList

Parameters:

o - The object to compare against.

Returns:

Whether this object is the same.

get

public java.lang.Object get(int index)

Method to retrieve an element no.

Specified by:

get in interface java.util.List

Overrides:

get in class java.util.LinkedList

Parameters:

index - The item to retrieve

Returns:

The element at that position.

getFirst

public java.lang.Object getFirst()

Method to retrieve the first element.

Specified by:

getFirst in interface java.util.Deque

Overrides:

getFirst in class java.util.LinkedList

Returns:

The first element

getLast

public java.lang.Object getLast()

Method to retrieve the last element.

Specified by:

getLast in interface java.util.Deque

Overrides:

getLast in class java.util.LinkedList

Returns:

The last element

hashCode

public int hashCode()

Hashcode operator.

Specified by:

hashCode in interface java.util.Collection

Specified by:

hashCode in interface java.util.List

Overrides:

hashCode in class java.util.AbstractList

Returns:

The Hash code.

indexOf

public int indexOf(java.lang.Object element)

Method to the position of an element.

Specified by:

indexOf in interface java.util.List

Overrides:

indexOf in class java.util.LinkedList

Parameters:

element - The element.

Returns:

The position.

isEmpty

public boolean isEmpty()

Accessor for whether the LinkedList is empty.

Specified by:

isEmpty in interface java.util.Collection

Specified by:

isEmpty in interface java.util.List

Overrides:

isEmpty in class java.util.AbstractCollection

Returns:

Whether it is empty.

iterator

public java.util.Iterator iterator()

Method to retrieve an iterator for the list.

Specified by:

iterator in interface java.lang.Iterable

Specified by:

iterator in interface java.util.Collection

Specified by:

iterator in interface java.util.Deque

Specified by:

iterator in interface java.util.List

Overrides:

iterator in class java.util.AbstractSequentialList

Returns:

The iterator

listIterator

public java.util.ListIterator listIterator(int index)

Method to retrieve a List iterator for the list from the index.

Specified by:

listIterator in interface java.util.List

Overrides:

listIterator in class java.util.LinkedList

Parameters:

index - The start point

Returns:

The iterator

lastIndexOf

public int lastIndexOf(java.lang.Object element)

Method to retrieve the last position of the element.

Specified by:

lastIndexOf in interface java.util.List

Overrides:

lastIndexOf in class java.util.LinkedList

Parameters:

element - The element

Returns:

The last position of this element in the List.

size

public int size()

Accessor for the size of the LinkedList.

Specified by:

size in interface java.util.Collection

Specified by:

size in interface java.util.Deque

Specified by:

size in interface java.util.List

Overrides:

size in class java.util.LinkedList

Returns:

The size.

subList

public java.util.List subList(int from,
                              int to)

Accessor for the subList of elements between from and to of the List

Specified by:

subList in interface java.util.List

Overrides:

subList in class java.util.AbstractList

Parameters:

from - Start index (inclusive)

to - End index (exclusive)

Returns:

The subList

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.List

Overrides:

toArray in class java.util.LinkedList

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.List

Overrides:

toArray in class java.util.LinkedList

Parameters:

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

Returns:

The array

add

public void add(int index,
                java.lang.Object element)

Method to add an element to a position in the LinkedList.

Specified by:

add in interface java.util.List

Overrides:

add in class java.util.LinkedList

Parameters:

index - The position

element - The new element

add

public boolean add(java.lang.Object element)

Method to add an element to the LinkedList.

Specified by:

add in interface java.util.Collection

Specified by:

add in interface java.util.Deque

Specified by:

add in interface java.util.List

Specified by:

add in interface java.util.Queue

Overrides:

add in class java.util.LinkedList

Parameters:

element - The new element

Returns:

Whether it was added ok.

addAll

public boolean addAll(java.util.Collection elements)

Method to add a Collection to the LinkedList.

Specified by:

addAll in interface java.util.Collection

Specified by:

addAll in interface java.util.List

Overrides:

addAll in class java.util.LinkedList

Parameters:

elements - The collection

Returns:

Whether it was added ok.

addAll

public boolean addAll(int index,
                      java.util.Collection elements)

Method to add a Collection to a position in the LinkedList.

Specified by:

addAll in interface java.util.List

Overrides:

addAll in class java.util.LinkedList

Parameters:

index - Position to insert the collection.

elements - The collection

Returns:

Whether it was added ok.

addFirst

public void addFirst(java.lang.Object element)

Method to add an element as first in the LinkedList.

Specified by:

addFirst in interface java.util.Deque

Overrides:

addFirst in class java.util.LinkedList

Parameters:

element - The new element

addLast

public void addLast(java.lang.Object element)

Method to add an element as last in the LinkedList.

Specified by:

addLast in interface java.util.Deque

Overrides:

addLast in class java.util.LinkedList

Parameters:

element - The new element

clear

public void clear()

Method to clear the LinkedList.

Specified by:

clear in interface java.util.Collection

Specified by:

clear in interface java.util.List

Overrides:

clear in class java.util.LinkedList

remove

public java.lang.Object remove(int index)

Method to remove an element from the LinkedList.

Specified by:

remove in interface java.util.List

Overrides:

remove in class java.util.LinkedList

Parameters:

index - The element position.

Returns:

The object that was removed

remove

public boolean remove(java.lang.Object element)

Method to remove an element from the List

Specified by:

remove in interface java.util.Collection

Specified by:

remove in interface java.util.Deque

Specified by:

remove in interface java.util.List

Overrides:

remove in class java.util.LinkedList

Parameters:

element - The Element to remove

Returns:

Whether it was removed successfully.

remove

public boolean remove(java.lang.Object element,
                      boolean allowCascadeDelete)

Method to remove an element from the List

Specified by:

remove in interface SCOCollection

Parameters:

element - The Element to remove

allowCascadeDelete - Whether to allow cascade delete

Returns:

Whether it was removed successfully.

removeAll

public boolean removeAll(java.util.Collection elements)

Method to remove a Collection from the LinkedList.

Specified by:

removeAll in interface java.util.Collection

Specified by:

removeAll in interface java.util.List

Overrides:

removeAll in class java.util.AbstractCollection

Parameters:

elements - The collection

Returns:

Whether it was removed ok.

removeFirst

public java.lang.Object removeFirst()

Method to remove the first element from the LinkedList.

Specified by:

removeFirst in interface java.util.Deque

Overrides:

removeFirst in class java.util.LinkedList

Returns:

The object that was removed

removeLast

public java.lang.Object removeLast()

Method to remove the last element from the LinkedList.

Specified by:

removeLast in interface java.util.Deque

Overrides:

removeLast in class java.util.LinkedList

Returns:

The object that was removed

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.List

Overrides:

retainAll in class java.util.AbstractCollection

Parameters:

c - The collection to retain

Returns:

Whether they were retained successfully.

set

public java.lang.Object set(int index,
                            java.lang.Object element,
                            boolean allowDependentField)

JPOX wrapper addition that allows turning off of the dependent-field checks when doing the position setting. This means that we can prevent the deletion of the object that was previously in that position. This particular feature is used when attaching a list field and where some elements have changed positions.

Specified by:

set in interface SCOList

Parameters:

index - The position

element - The new element

allowDependentField - Whether to allow dependent-field deletes

Returns:

The element previously at that position

set

public java.lang.Object set(int index,
                            java.lang.Object element)

Method to set the element at a position in the LinkedList.

Specified by:

set in interface java.util.List

Overrides:

set in class java.util.LinkedList

Parameters:

index - The position

element - The new element

Returns:

The element previously at that position

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