Class Stack<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

java.util.Vector<E>

java.util.Stack<E>

org.datanucleus.store.types.wrappers.Stack<E>

All Implemented Interfaces:

Serializable, Cloneable, Iterable<E>, Collection<E>, List<E>, RandomAccess, SCO<Stack<E>>, SCOCollection<Stack<E>,E>, SCOContainer<Stack<E>>, SCOList<Stack<E>,E>

Direct Known Subclasses:

Stack

public class Stack<E>
extends Stack<E>
implements SCOList<Stack<E>,E>

A mutable second-class Stack object. This is the simplified form that intercepts mutators and marks the field as dirty. It also handles cascade-delete triggering for persistable elements.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Stack<E>	delegate	The internal "delegate".
protected AbstractMemberMetaData	ownerMmd
protected DNStateManager	ownerSM
private static final long	serialVersionUID
protected boolean	sorting

Fields inherited from class Vector

capacityIncrement, elementCount, elementData

Fields inherited from class AbstractList

modCount

Constructor Summary

Constructors

Constructor	Description
Stack(DNStateManager sm, AbstractMemberMetaData mmd)	Constructor, using StateManager of the "owner" and the field name.

Method Summary

Modifier and Type	Method	Description
void	add(int index, E element)	Method to add an element to a position in the Stack
boolean	add(E element)	Method to add an element to the Stack
boolean	addAll(int index, Collection<? extends E> elements)	Method to add a Collection to a position in the Stack
boolean	addAll(Collection<? extends E> elements)	Method to add a Collection to the Stack
void	addElement(E element)	Method to add an element to the Stack
void	attachCopy(Stack value)	Method to return an attached copy of the passed (detached) value.
void	clear()	Method to clear the Stack
Object	clone()	Clone operator to return a copy of this object.
boolean	contains(Object element)	Method to return if the list contains this element.
Stack	detachCopy(FetchPlanState state)	Method to return a detached copy of the container.
boolean	empty()	Accessor for whether the Stack is empty.
void	ensureCapacity(int minCapacity)
boolean	equals(Object o)
void	forEach(Consumer<? super E> action)
E	get(int index)	Method to retrieve an element no.
String	getFieldName()	Accessor for the field name.
Object	getOwner()	Accessor for the owner object.
Stack<E>	getValue()	Accessor for the unwrapped value that we are wrapping.
int	hashCode()
int	indexOf(Object element)	Method to the position of an element.
void	initialise()	Method to initialise the SCO for use, and allowing the SCO to be loaded from the datastore (when we have a backing store).
void	initialise(Stack<E> c)	Method to initialise the SCO for use with the provided initial value.
void	initialise(Stack<E> newValue, Object oldValue)	Method to initialise the SCO for use, where replacing an old value with a new value such as when calling a setter field passing in a new value.
boolean	isEmpty()	Accessor for whether the Stack is empty.
boolean	isLoaded()	Method to return if the SCO has its contents loaded.
Iterator<E>	iterator()	Method to retrieve an iterator for the list.
int	lastIndexOf(Object element)	Method to retrieve the last position of the element.
ListIterator<E>	listIterator()	Method to retrieve a List iterator for the list.
ListIterator<E>	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
Stream<E>	parallelStream()
E	peek()	Method to retrieve the element at the top of the stack.
E	pop()	Method to remove the top element in the stack and return it.
E	push(E element)	Method to push an element onto the stack and return it.
E	remove(int index)	Method to remove an element from the Stack
boolean	remove(Object element)	Method to remove (the first occurrence of) an element from the collection
boolean	remove(Object element, boolean allowCascadeDelete)	Method to remove (the first occurrence of) an element from the collection
boolean	removeAll(Collection elements)	Method to remove a Collection of objects from the Stack
void	removeAllElements()	Method to remove all elements from the Stack.
boolean	removeElement(Object element)	Method to remove an element from the Stack
void	removeElementAt(int index)	Method to remove an element from the Stack
boolean	retainAll(Collection c)	Method to retain a Collection of elements (and remove all others).
E	set(int index, E element)	Method to set the element at a position in the Stack
E	set(int index, E element, boolean allowDependentField)	Wrapper addition that allows turning off of the dependent-field checks when doing the position setting.
void	setElementAt(E element, int index)	Method to set the element at a position in the Stack
void	setValue(Stack<E> value)	Method to change the delegate value this wraps (to save recreating the wrapper).
int	size()	Accessor for the size of the Stack.
void	sort(Comparator<? super E> comp)
Spliterator<E>	spliterator()
Stream<E>	stream()
List<E>	subList(int from, int to)	Accessor for the subList of elements between from and to of the List
Object[]	toArray()
<T> T[]	toArray(T[] a)
void	trimToSize()
void	unsetOwner()	Method to unset the owner and field information.
void	updateEmbeddedElement(E element, int fieldNumber, Object value, boolean makeDirty)	Method to update an embedded element in this collection.
protected Object	writeReplace()	The writeReplace method is called when ObjectOutputStream is preparing to write the object to the stream.

Methods inherited from class Stack

search

Methods inherited from class Vector

capacity, containsAll, copyInto, elementAt, elements, firstElement, indexOf, insertElementAt, lastElement, lastIndexOf, removeIf, removeRange, replaceAll, setSize, toString

Methods inherited from class Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

ownerSM

protected transient DNStateManager ownerSM

ownerMmd

protected transient AbstractMemberMetaData ownerMmd

delegate

protected Stack<E> delegate

The internal "delegate".

sorting

protected boolean sorting

Constructor Details

Stack

public Stack(DNStateManager sm,
 AbstractMemberMetaData mmd)

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

Parameters:

sm - The owner StateManager

mmd - Metadata for the member

Method Details

initialise

public void initialise(Stack<E> newValue,
 Object oldValue)

Description copied from interface: SCO

Method to initialise the SCO for use, where replacing an old value with a new value such as when calling a setter field passing in a new value. Note that oldValue is marked as Object since for cases where the member type is Collection the newValue could be, for example, ArrayList, and the oldValue of type Collection (representing null).

Specified by:

initialise in interface SCO<E>

Parameters:

newValue - New value (to wrap)

oldValue - Old value (to use in deciding what needs deleting etc)

initialise

public void initialise(Stack<E> c)

Description copied from interface: SCO

Method to initialise the SCO for use with the provided initial value. This is used, for example, when retrieving the field from the datastore and setting it in the persistable object.

Specified by:

initialise in interface SCO<E>

Parameters:

c - the object from which to copy the value.

initialise

public void initialise()

Description copied from interface: SCO

Method to initialise the SCO for use, and allowing the SCO to be loaded from the datastore (when we have a backing store). This can be utilised to perform any eager loading of information from the datastore.

Specified by:

initialise in interface SCO<E>

getValue

public Stack<E> getValue()

Accessor for the unwrapped value that we are wrapping.

Specified by:

getValue in interface SCO<E>

Returns:

The unwrapped value

setValue

public void setValue(Stack<E> value)

Description copied from interface: SCOContainer

Method to change the delegate value this wraps (to save recreating the wrapper).

Specified by:

setValue in interface SCOContainer<E>

Parameters:

value - The new 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<E>

isLoaded

public boolean isLoaded()

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

Specified by:

isLoaded in interface SCOContainer<E>

Returns:

Whether it is loaded

updateEmbeddedElement

public void updateEmbeddedElement(E element,
 int fieldNumber,
 Object value,
 boolean makeDirty)

Method to update an embedded element in this collection.

Specified by:

updateEmbeddedElement in interface SCOCollection<Stack<E>,E>

Parameters:

element - The element

fieldNumber - Number of field in the element

value - New value for this field

makeDirty - Whether to make the SCO field dirty.

getFieldName

public String getFieldName()

Accessor for the field name.

Specified by:

getFieldName in interface SCO<E>

Returns:

The field name

getOwner

public Object getOwner()

Accessor for the owner object.

Specified by:

getOwner in interface SCO<E>

Returns:

The owner object

unsetOwner

public void unsetOwner()

Method to unset the owner and field information.

Specified by:

unsetOwner in interface SCO<E>

makeDirty

public void makeDirty()

Utility to mark the object as dirty

detachCopy

public Stack 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<E>

Parameters:

state - State of detachment state

Returns:

The detached container

attachCopy

public void attachCopy(Stack 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<E>

Parameters:

value - The new (collection) value

clone

public 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 persistable objects. In contrast to Object.clone(), this method must not throw a CloneNotSupportedException.

Specified by:

clone in interface SCO<E>

Overrides:

clone in class Vector<E>

Returns:

The cloned object

contains

public boolean contains(Object element)

Method to return if the list contains this element.

Specified by:

contains in interface Collection<E>

Specified by:

contains in interface List<E>

Overrides:

contains in class Vector<E>

Parameters:

element - The element

Returns:

Whether it is contained

empty

public boolean empty()

Accessor for whether the Stack is empty.

Overrides:

empty in class Stack<E>

Returns:

Whether it is empty.

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<E>

Specified by:

equals in interface List<E>

Overrides:

equals in class Vector<E>

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<E>

Specified by:

hashCode in interface List<E>

Overrides:

hashCode in class Vector<E>

get

public E get(int index)

Method to retrieve an element no.

Specified by:

get in interface List<E>

Overrides:

get in class Vector<E>

Parameters:

index - The item to retrieve

Returns:

The element at that position.

indexOf

public int indexOf(Object element)

Method to the position of an element.

Specified by:

indexOf in interface List<E>

Overrides:

indexOf in class Vector<E>

Parameters:

element - The element.

Returns:

The position.

isEmpty

public boolean isEmpty()

Accessor for whether the Stack is empty.

Specified by:

isEmpty in interface Collection<E>

Specified by:

isEmpty in interface List<E>

Overrides:

isEmpty in class Vector<E>

Returns:

Whether it is empty.

iterator

public Iterator<E> iterator()

Method to retrieve an iterator for the list.

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface List<E>

Overrides:

iterator in class Vector<E>

Returns:

The iterator

listIterator

public ListIterator<E> listIterator()

Method to retrieve a List iterator for the list.

Specified by:

listIterator in interface List<E>

Overrides:

listIterator in class Vector<E>

Returns:

The iterator

listIterator

public ListIterator<E> listIterator(int index)

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

Specified by:

listIterator in interface List<E>

Overrides:

listIterator in class Vector<E>

Parameters:

index - The start point

Returns:

The iterator

lastIndexOf

public int lastIndexOf(Object element)

Method to retrieve the last position of the element.

Specified by:

lastIndexOf in interface List<E>

Overrides:

lastIndexOf in class Vector<E>

Parameters:

element - The element

Returns:

The last position of this element in the List.

peek

public E peek()

Method to retrieve the element at the top of the stack.

Overrides:

peek in class Stack<E>

Returns:

The element at the top of the stack

size

public int size()

Accessor for the size of the Stack.

Specified by:

size in interface Collection<E>

Specified by:

size in interface List<E>

Overrides:

size in class Vector<E>

Returns:

The size.

subList

public List<E> subList(int from,
 int to)

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

Specified by:

subList in interface List<E>

Overrides:

subList in class Vector<E>

Parameters:

from - Start index (inclusive)

to - End index (exclusive)

Returns:

The subList

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<E>

Specified by:

toArray in interface List<E>

Overrides:

toArray in class Vector<E>

toArray

public <T> T[] toArray(T[] a)

Specified by:

toArray in interface Collection<E>

Specified by:

toArray in interface List<E>

Overrides:

toArray in class Vector<E>

add

public void add(int index,
 E element)

Method to add an element to a position in the Stack

Specified by:

add in interface List<E>

Overrides:

add in class Vector<E>

Parameters:

index - The position

element - The new element

add

public boolean add(E element)

Method to add an element to the Stack

Specified by:

add in interface Collection<E>

Specified by:

add in interface List<E>

Overrides:

add in class Vector<E>

Parameters:

element - The new element

Returns:

Whether it was added ok.

addElement

public void addElement(E element)

Method to add an element to the Stack

Overrides:

addElement in class Vector<E>

Parameters:

element - The new element

addAll

public boolean addAll(Collection<? extends E> elements)

Method to add a Collection to the Stack

Specified by:

addAll in interface Collection<E>

Specified by:

addAll in interface List<E>

Overrides:

addAll in class Vector<E>

Parameters:

elements - The collection

Returns:

Whether it was added ok.

addAll

public boolean addAll(int index,
 Collection<? extends E> elements)

Method to add a Collection to a position in the Stack

Specified by:

addAll in interface List<E>

Overrides:

addAll in class Vector<E>

Parameters:

index - Position to insert the collection.

elements - The collection

Returns:

Whether it was added ok.

clear

public void clear()

Method to clear the Stack

Specified by:

clear in interface Collection<E>

Specified by:

clear in interface List<E>

Overrides:

clear in class Vector<E>

pop

public E pop()

Method to remove the top element in the stack and return it.

Overrides:

pop in class Stack<E>

Returns:

The top element that was in the Stack (now removed).

push

public E push(E element)

Method to push an element onto the stack and return it.

Overrides:

push in class Stack<E>

Parameters:

element - The element to push onto the stack.

Returns:

The element that was pushed onto the Stack

remove

public boolean remove(Object element)

Method to remove (the first occurrence of) an element from the collection

Specified by:

remove in interface Collection<E>

Specified by:

remove in interface List<E>

Overrides:

remove in class Vector<E>

Parameters:

element - The Element to remove

Returns:

Whether it was removed successfully.

remove

public boolean remove(Object element,
 boolean allowCascadeDelete)

Method to remove (the first occurrence of) an element from the collection

Specified by:

remove in interface SCOCollection<Stack<E>,E>

Parameters:

element - The Element to remove

allowCascadeDelete - Whether to cascade delete

Returns:

Whether it was removed successfully.

removeAll

public boolean removeAll(Collection elements)

Method to remove a Collection of objects from the Stack

Specified by:

removeAll in interface Collection<E>

Specified by:

removeAll in interface List<E>

Overrides:

removeAll in class Vector<E>

Parameters:

elements - The Collection

Returns:

Whether the collection of elements were removed

removeElement

public boolean removeElement(Object element)

Method to remove an element from the Stack

Overrides:

removeElement in class Vector<E>

Parameters:

element - The element

Returns:

Whether the element was removed

remove

public E remove(int index)

Method to remove an element from the Stack

Specified by:

remove in interface List<E>

Overrides:

remove in class Vector<E>

Parameters:

index - The element position.

Returns:

The object that was removed

removeElementAt

public void removeElementAt(int index)

Method to remove an element from the Stack

Overrides:

removeElementAt in class Vector<E>

Parameters:

index - The element position.

removeAllElements

public void removeAllElements()

Method to remove all elements from the Stack. Same as clear().

Overrides:

removeAllElements in class Vector<E>

retainAll

public boolean retainAll(Collection c)

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

Specified by:

retainAll in interface Collection<E>

Specified by:

retainAll in interface List<E>

Overrides:

retainAll in class Vector<E>

Parameters:

c - The collection to retain

Returns:

Whether they were retained successfully.

set

public E set(int index,
 E element,
 boolean allowDependentField)

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<Stack<E>,E>

Parameters:

index - The position

element - The new element

allowDependentField - Whether to allow dependent-field deletes

Returns:

The element previously at that position

set

public E set(int index,
 E element)

Method to set the element at a position in the Stack

Specified by:

set in interface List<E>

Overrides:

set in class Vector<E>

Parameters:

index - The position

element - The new element

Returns:

The element previously at that position

setElementAt

public void setElementAt(E element,
 int index)

Method to set the element at a position in the Stack

Overrides:

setElementAt in class Vector<E>

Parameters:

element - The new element

index - The position

writeReplace

protected Object writeReplace()
                       throws 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:

ObjectStreamException - if an error occurs

stream

public Stream<E> stream()

Specified by:

stream in interface Collection<E>

parallelStream

public Stream<E> parallelStream()

Specified by:

parallelStream in interface Collection<E>

trimToSize

public void trimToSize()

Overrides:

trimToSize in class Vector<E>

ensureCapacity

public void ensureCapacity(int minCapacity)

Overrides:

ensureCapacity in class Vector<E>

forEach

public void forEach(Consumer<? super E> action)

Specified by:

forEach in interface Iterable<E>

Overrides:

forEach in class Vector<E>

spliterator

public Spliterator<E> spliterator()

Specified by:

spliterator in interface Collection<E>

Specified by:

spliterator in interface Iterable<E>

Specified by:

spliterator in interface List<E>

Overrides:

spliterator in class Vector<E>

sort

public void sort(Comparator<? super E> comp)

Specified by:

sort in interface List<E>

Overrides:

sort in class Vector<E>