Class TreeSet<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<E>

java.util.TreeSet<E>

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

All Implemented Interfaces:

Serializable, Cloneable, Iterable<E>, Collection<E>, NavigableSet<E>, Set<E>, SortedSet<E>, SCO<TreeSet<E>>, SCOCollection<TreeSet<E>, E>, SCOContainer<TreeSet<E>>

Direct Known Subclasses:

TreeSet

public class TreeSet<E>
extends TreeSet<E>
implements SCOCollection<TreeSet<E>, E>

A mutable second-class TreeSet 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 TreeSet<E>	delegate	The internal "delegate".
protected AbstractMemberMetaData	ownerMmd
protected DNStateManager	ownerSM
private static final long	serialVersionUID

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
boolean	add(E element)	Method to add an element to the TreeSet.
boolean	addAll(Collection<? extends E> elements)	Method to add a collection to the TreeSet.
void	attachCopy(TreeSet value)	Method to return an attached copy of the passed (detached) value.
void	clear()	Method to clear the TreeSet
Object	clone()	Creates and returns a copy of this object.
Comparator<? super E>	comparator()	Accessor for the comparator.
boolean	contains(Object element)	Accessor for whether an element is contained in this Set.
boolean	containsAll(Collection c)	Accessor for whether a collection is contained in this Set.
TreeSet<E>	detachCopy(FetchPlanState state)	Method to return a detached copy of the container.
boolean	equals(Object o)
E	first()	Accessor for the first element in the sorted set.
void	forEach(Consumer<? super E> action)
String	getFieldName()	Accessor for the field name.
Object	getOwner()	Accessor for the owner object.
TreeSet<E>	getValue()	Accessor for the unwrapped value that we are wrapping.
int	hashCode()
SortedSet<E>	headSet(E toElement)	Method to retrieve the head elements up to the specified 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(TreeSet<E> c)	Method to initialise the SCO for use with the provided initial value.
void	initialise(TreeSet<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.
protected void	initialiseDelegate()	Convenience method to set up the delegate respecting any comparator specified in MetaData.
boolean	isEmpty()	Accessor for whether the TreeSet is empty.
boolean	isLoaded()	Method to return if the SCO has its contents loaded.
Iterator<E>	iterator()	Accessor for an iterator for the Set.
E	last()	Accessor for the last element in the sorted set.
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()
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 all elements from the collection from the TreeSet.
boolean	retainAll(Collection<?> c)	Method to retain a Collection of elements (and remove all others).
void	setValue(TreeSet<E> value)	Method to change the delegate value this wraps (to save recreating the wrapper).
int	size()	Accessor for the size of the TreeSet.
Spliterator<E>	spliterator()
Stream<E>	stream()
SortedSet<E>	subSet(E fromElement, E toElement)	Method to retrieve the subset of elements between the specified elements.
SortedSet<E>	tailSet(E fromElement)	Method to retrieve the set of elements after the specified element.
Object[]	toArray()	Method to return the list as an array.
<T> T[]	toArray(T[] a)	Method to return the list as an array.
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 TreeSet

ceiling, descendingIterator, descendingSet, floor, headSet, higher, lower, pollFirst, pollLast, subSet, tailSet

Methods inherited from class AbstractCollection

toString

Methods inherited from class Object

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

Methods inherited from interface Collection

removeIf

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 TreeSet<E> delegate

The internal "delegate".

Constructor Details

TreeSet

public TreeSet(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(TreeSet<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(TreeSet<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>

initialiseDelegate

protected void initialiseDelegate()

Convenience method to set up the delegate respecting any comparator specified in MetaData.

getValue

public TreeSet<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(TreeSet<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<TreeSet<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 TreeSet<E> 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 for detachment process

Returns:

The detached container

attachCopy

public void attachCopy(TreeSet 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()

Creates and returns a copy of this object.

Specified by:

clone in interface SCO<E>

Overrides:

clone in class TreeSet<E>

Returns:

The cloned object

comparator

public Comparator<? super E> comparator()

Accessor for the comparator.

Specified by:

comparator in interface SortedSet<E>

Overrides:

comparator in class TreeSet<E>

Returns:

The comparator

contains

public boolean contains(Object element)

Accessor for whether an element is contained in this Set.

Specified by:

contains in interface Collection<E>

Specified by:

contains in interface Set<E>

Overrides:

contains in class TreeSet<E>

Parameters:

element - The element

Returns:

Whether it is contained.

containsAll

public boolean containsAll(Collection c)

Accessor for whether a collection is contained in this Set.

Specified by:

containsAll in interface Collection<E>

Specified by:

containsAll in interface Set<E>

Overrides:

containsAll in class AbstractCollection<E>

Parameters:

c - The collection

Returns:

Whether it is contained.

equals

public boolean equals(Object o)

Specified by:

equals in interface Collection<E>

Specified by:

equals in interface Set<E>

Overrides:

equals in class AbstractSet<E>

first

public E first()

Accessor for the first element in the sorted set.

Specified by:

first in interface SortedSet<E>

Overrides:

first in class TreeSet<E>

Returns:

The first element

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<E>

Specified by:

hashCode in interface Set<E>

Overrides:

hashCode in class AbstractSet<E>

isEmpty

public boolean isEmpty()

Accessor for whether the TreeSet is empty.

Specified by:

isEmpty in interface Collection<E>

Specified by:

isEmpty in interface Set<E>

Overrides:

isEmpty in class TreeSet<E>

Returns:

Whether it is empty.

iterator

public Iterator<E> iterator()

Accessor for an iterator for the Set.

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface NavigableSet<E>

Specified by:

iterator in interface Set<E>

Overrides:

iterator in class TreeSet<E>

Returns:

The iterator

headSet

public SortedSet<E> headSet(E toElement)

Method to retrieve the head elements up to the specified element.

Specified by:

headSet in interface NavigableSet<E>

Specified by:

headSet in interface SortedSet<E>

Overrides:

headSet in class TreeSet<E>

Parameters:

toElement - the element to return up to.

Returns:

The set of elements meeting the input

subSet

public SortedSet<E> subSet(E fromElement,
 E toElement)

Method to retrieve the subset of elements between the specified elements.

Specified by:

subSet in interface NavigableSet<E>

Specified by:

subSet in interface SortedSet<E>

Overrides:

subSet in class TreeSet<E>

Parameters:

fromElement - The start element

toElement - The end element

Returns:

The set of elements meeting the input

tailSet

public SortedSet<E> tailSet(E fromElement)

Method to retrieve the set of elements after the specified element.

Specified by:

tailSet in interface NavigableSet<E>

Specified by:

tailSet in interface SortedSet<E>

Overrides:

tailSet in class TreeSet<E>

Parameters:

fromElement - The start element

Returns:

The set of elements meeting the input

last

public E last()

Accessor for the last element in the sorted set.

Specified by:

last in interface SortedSet<E>

Overrides:

last in class TreeSet<E>

Returns:

The last element

size

public int size()

Accessor for the size of the TreeSet.

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

Overrides:

size in class TreeSet<E>

Returns:

The size.

toArray

public Object[] toArray()

Method to return the list as an array.

Specified by:

toArray in interface Collection<E>

Specified by:

toArray in interface Set<E>

Overrides:

toArray in class AbstractCollection<E>

Returns:

The array

toArray

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

Method to return the list as an array.

Specified by:

toArray in interface Collection<E>

Specified by:

toArray in interface Set<E>

Overrides:

toArray in class AbstractCollection<E>

Parameters:

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

Returns:

The array

add

public boolean add(E element)

Method to add an element to the TreeSet.

Specified by:

add in interface Collection<E>

Specified by:

add in interface Set<E>

Overrides:

add in class TreeSet<E>

Parameters:

element - The new element

Returns:

Whether it was added ok.

addAll

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

Method to add a collection to the TreeSet.

Specified by:

addAll in interface Collection<E>

Specified by:

addAll in interface Set<E>

Overrides:

addAll in class TreeSet<E>

Parameters:

elements - The collection

Returns:

Whether it was added ok.

clear

public void clear()

Method to clear the TreeSet

Specified by:

clear in interface Collection<E>

Specified by:

clear in interface Set<E>

Overrides:

clear in class TreeSet<E>

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 Set<E>

Overrides:

remove in class TreeSet<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<TreeSet<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 all elements from the collection from the TreeSet.

Specified by:

removeAll in interface Collection<E>

Specified by:

removeAll in interface Set<E>

Overrides:

removeAll in class AbstractSet<E>

Parameters:

elements - The collection of elements to remove

Returns:

Whether it was removed ok.

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 Set<E>

Overrides:

retainAll in class AbstractCollection<E>

Parameters:

c - The collection to retain

Returns:

Whether they were retained successfully.

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>

spliterator

public Spliterator<E> spliterator()

Specified by:

spliterator in interface Collection<E>

Specified by:

spliterator in interface Iterable<E>

Specified by:

spliterator in interface Set<E>

Specified by:

spliterator in interface SortedSet<E>

Overrides:

spliterator in class TreeSet<E>

forEach

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

Specified by:

forEach in interface Iterable<E>