Class Vector<E>
- java.lang.Object
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- java.util.AbstractCollection<E>
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- java.util.AbstractList<E>
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- java.util.Vector<E>
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- org.datanucleus.store.types.wrappers.Vector<E>
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- org.datanucleus.store.types.wrappers.backed.Vector<E>
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,java.lang.Iterable<E>
,java.util.Collection<E>
,java.util.List<E>
,java.util.RandomAccess
,SCO<java.util.Vector<E>>
,SCOCollection<java.util.Vector<E>,E>
,SCOContainer<java.util.Vector<E>>
,SCOList<java.util.Vector<E>,E>
,BackedSCO
public class Vector<E> extends Vector<E> implements BackedSCO
A mutable second-class Vector object. This class extends Vector, using that class to contain the current objects, and the backing ListStore to be the interface to the datastore. A "backing store" is not present for datastores that dont use DatastoreClass, or if the container is serialised or non-persistent.Modes of Operation
The user can operate the list in 2 modes. The cached mode will use an internal cache of the elements (in the "delegate") reading them at the first opportunity and then using the cache thereafter. The non-cached mode will just go direct to the "backing store" each call.Mutators
When the "backing store" is present any updates are passed direct to the datastore as well as to the "delegate". If the "backing store" isn't present the changes are made to the "delegate" only.Accessors
When any accessor method is invoked, it typically checks whether the container has been loaded from its "backing store" (where present) and does this as necessary. Some methods (size()) just check if everything is loaded and use the delegate if possible, otherwise going direct to the datastore.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected boolean
allowNulls
protected ListStore<E>
backingStore
protected boolean
isCacheLoaded
protected boolean
useCache
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Constructor Summary
Constructors Constructor Description Vector(DNStateManager sm, AbstractMemberMetaData mmd)
Constructor, using StateManager of the "owner" and the field name.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
add(int index, E element)
Method to add an element to a position in the Vector.boolean
add(E element)
Method to add an element to the Vector.boolean
addAll(int index, java.util.Collection elements)
Method to add a Collection to a position in the Vector.boolean
addAll(java.util.Collection<? extends E> elements)
Method to add a Collection to the Vector.void
addElement(E element)
Method to add an element to the Vector.void
clear()
Method to clear the Vector.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.E
elementAt(int index)
Method to retrieve an element no.java.util.Enumeration
elements()
Method to return the elements of the List as an Enumeration.boolean
equals(java.lang.Object o)
Equality operator.E
firstElement()
Method to return the first element in the Vector.void
forEach(java.util.function.Consumer<? super E> action)
E
get(int index)
Method to retrieve an element no.Store
getBackingStore()
java.util.Vector<E>
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.int
indexOf(java.lang.Object element, int startIndex)
Method to the position of an element.void
initialise()
Method to initialise the SCO for use.void
initialise(java.util.Vector<E> c)
Method to initialise the SCO from an existing value.void
initialise(java.util.Vector<E> newValue, java.lang.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 Vector is empty.boolean
isLoaded()
Method to return if the SCO has its contents loaded.java.util.Iterator<E>
iterator()
Method to retrieve an iterator for the list.E
lastElement()
Method to return the last element in the Vector.int
lastIndexOf(java.lang.Object element)
Method to retrieve the last position of the element.int
lastIndexOf(java.lang.Object element, int startIndex)
Method to retrieve the last position of the element.java.util.ListIterator<E>
listIterator()
Method to retrieve a List iterator for the list.java.util.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.protected void
loadFromStore()
Method to load all elements from the "backing store" where appropriate.java.util.stream.Stream<E>
parallelStream()
E
remove(int index)
Method to remove an element from the Vector.boolean
remove(java.lang.Object element)
Method to remove (the first occurrence of) an element from the collectionboolean
remove(java.lang.Object element, boolean allowCascadeDelete)
Method to remove (the first occurrence of) an element from the collectionboolean
removeAll(java.util.Collection elements)
Method to remove a Collection of elements from the Vector.void
removeAllElements()
Method to remove all elements from the Vector.boolean
removeElement(java.lang.Object element)
Method to remove an element from the Vector.void
removeElementAt(int index)
Method to remove an element from the Vector.boolean
retainAll(java.util.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 Vector.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 Vector.int
size()
Accessor for the size of the Vector.java.util.Spliterator<E>
spliterator()
java.util.stream.Stream<E>
stream()
java.util.List<E>
subList(int from, int to)
Accessor for the subList of elements between from and to of the Listjava.lang.Object[]
toArray()
<T> T[]
toArray(T[] a)
void
unsetOwner()
Method to unset the owner and field information.void
updateEmbeddedElement(E element, int fieldNumber, java.lang.Object value, boolean makeDirty)
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 org.datanucleus.store.types.wrappers.Vector
attachCopy, detachCopy, ensureCapacity, getFieldName, getOwner, makeDirty, setValue, sort, trimToSize
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Constructor Detail
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Vector
public Vector(DNStateManager sm, AbstractMemberMetaData mmd)
Constructor, using StateManager of the "owner" and the field name.- Parameters:
sm
- The owner StateManagermmd
- Metadata for the member
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Method Detail
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initialise
public void initialise(java.util.Vector<E> newValue, java.lang.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 interfaceSCO<E>
- Overrides:
initialise
in classVector<E>
- Parameters:
newValue
- New value (to wrap)oldValue
- Old value (to use in deciding what needs deleting etc)
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initialise
public void initialise(java.util.Vector<E> c)
Method to initialise the SCO from an existing value.- Specified by:
initialise
in interfaceSCO<E>
- Overrides:
initialise
in classVector<E>
- Parameters:
c
- The object to set from
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initialise
public void initialise()
Method to initialise the SCO for use.- Specified by:
initialise
in interfaceSCO<E>
- Overrides:
initialise
in classVector<E>
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getValue
public java.util.Vector<E> getValue()
Accessor for the unwrapped value that we are wrapping.
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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.
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isLoaded
public boolean isLoaded()
Method to return if the SCO has its contents loaded. If the SCO doesn't support lazy loading will just return true.
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loadFromStore
protected void loadFromStore()
Method to load all elements from the "backing store" where appropriate.
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getBackingStore
public Store getBackingStore()
- Specified by:
getBackingStore
in interfaceBackedSCO
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updateEmbeddedElement
public void updateEmbeddedElement(E element, int fieldNumber, java.lang.Object value, boolean makeDirty)
Method to update an embedded element in this collection.- Specified by:
updateEmbeddedElement
in interfaceSCOCollection<java.util.Vector<E>,E>
- Overrides:
updateEmbeddedElement
in classVector<E>
- Parameters:
element
- The elementfieldNumber
- Number of field in the elementvalue
- New value for this fieldmakeDirty
- Whether to make the SCO field dirty.
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unsetOwner
public void unsetOwner()
Method to unset the owner and field information.- Specified by:
unsetOwner
in interfaceSCO<E>
- Overrides:
unsetOwner
in classVector<E>
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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 persistable objects. In contrast to Object.clone(), this method must not throw a CloneNotSupportedException.
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contains
public boolean contains(java.lang.Object element)
Description copied from class:Vector
Method to return if the list contains this element.
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containsAll
public boolean containsAll(java.util.Collection c)
Description copied from class:Vector
Accessor for whether a collection of elements are contained here.- Specified by:
containsAll
in interfacejava.util.Collection<E>
- Specified by:
containsAll
in interfacejava.util.List<E>
- Overrides:
containsAll
in classVector<E>
- Parameters:
c
- The collection of elements.- Returns:
- Whether they are contained.
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elementAt
public E elementAt(int index)
Description copied from class:Vector
Method to retrieve an element no.
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equals
public boolean equals(java.lang.Object o)
Description copied from class:Vector
Equality operator.
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elements
public java.util.Enumeration elements()
Description copied from class:Vector
Method to return the elements of the List as an Enumeration.
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firstElement
public E firstElement()
Description copied from class:Vector
Method to return the first element in the Vector.- Overrides:
firstElement
in classVector<E>
- Returns:
- The first element
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forEach
public void forEach(java.util.function.Consumer<? super E> action)
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get
public E get(int index)
Description copied from class:Vector
Method to retrieve an element no.
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hashCode
public int hashCode()
Description copied from class:Vector
Hashcode operator.
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indexOf
public int indexOf(java.lang.Object element)
Description copied from class:Vector
Method to the position of an element.
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indexOf
public int indexOf(java.lang.Object element, int startIndex)
Description copied from class:Vector
Method to the position of an element.
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isEmpty
public boolean isEmpty()
Description copied from class:Vector
Accessor for whether the Vector is empty.
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iterator
public java.util.Iterator<E> iterator()
Description copied from class:Vector
Method to retrieve an iterator for the list.
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lastElement
public E lastElement()
Description copied from class:Vector
Method to return the last element in the Vector.- Overrides:
lastElement
in classVector<E>
- Returns:
- The last element
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lastIndexOf
public int lastIndexOf(java.lang.Object element)
Description copied from class:Vector
Method to retrieve the last position of the element.- Specified by:
lastIndexOf
in interfacejava.util.List<E>
- Overrides:
lastIndexOf
in classVector<E>
- Parameters:
element
- The element- Returns:
- The last position of this element in the List.
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lastIndexOf
public int lastIndexOf(java.lang.Object element, int startIndex)
Description copied from class:Vector
Method to retrieve the last position of the element.- Overrides:
lastIndexOf
in classVector<E>
- Parameters:
element
- The elementstartIndex
- The start position- Returns:
- The last position of this element in the List.
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listIterator
public java.util.ListIterator<E> listIterator()
Description copied from class:Vector
Method to retrieve a List iterator for the list.- Specified by:
listIterator
in interfacejava.util.List<E>
- Overrides:
listIterator
in classVector<E>
- Returns:
- The iterator
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listIterator
public java.util.ListIterator<E> listIterator(int index)
Description copied from class:Vector
Method to retrieve a List iterator for the list from the index.- Specified by:
listIterator
in interfacejava.util.List<E>
- Overrides:
listIterator
in classVector<E>
- Parameters:
index
- The start point- Returns:
- The iterator
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size
public int size()
Description copied from class:Vector
Accessor for the size of the Vector.
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subList
public java.util.List<E> subList(int from, int to)
Description copied from class:Vector
Accessor for the subList of elements between from and to of the List
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toArray
public java.lang.Object[] toArray()
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toArray
public <T> T[] toArray(T[] a)
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add
public void add(int index, E element)
Description copied from class:Vector
Method to add an element to a position in the Vector.
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add
public boolean add(E element)
Description copied from class:Vector
Method to add an element to the Vector.
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addAll
public boolean addAll(java.util.Collection<? extends E> elements)
Description copied from class:Vector
Method to add a Collection to the Vector.
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addAll
public boolean addAll(int index, java.util.Collection elements)
Description copied from class:Vector
Method to add a Collection to a position in the Vector.
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addElement
public void addElement(E element)
Description copied from class:Vector
Method to add an element to the Vector.- Overrides:
addElement
in classVector<E>
- Parameters:
element
- The new element
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clear
public void clear()
Description copied from class:Vector
Method to clear the Vector.
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remove
public boolean remove(java.lang.Object element)
Description copied from class:Vector
Method to remove (the first occurrence of) an element from the collection
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remove
public boolean remove(java.lang.Object element, boolean allowCascadeDelete)
Description copied from class:Vector
Method to remove (the first occurrence of) an element from the collection
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remove
public E remove(int index)
Description copied from class:Vector
Method to remove an element from the Vector.
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removeAll
public boolean removeAll(java.util.Collection elements)
Description copied from class:Vector
Method to remove a Collection of elements from the Vector.
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removeElement
public boolean removeElement(java.lang.Object element)
Description copied from class:Vector
Method to remove an element from the Vector.- Overrides:
removeElement
in classVector<E>
- Parameters:
element
- The element- Returns:
- Whether the element was removed
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removeElementAt
public void removeElementAt(int index)
Description copied from class:Vector
Method to remove an element from the Vector.- Overrides:
removeElementAt
in classVector<E>
- Parameters:
index
- The element position.
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removeAllElements
public void removeAllElements()
Description copied from class:Vector
Method to remove all elements from the Vector.- Overrides:
removeAllElements
in classVector<E>
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retainAll
public boolean retainAll(java.util.Collection c)
Description copied from class:Vector
Method to retain a Collection of elements (and remove all others).
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set
public E set(int index, E element, boolean allowDependentField)
Description copied from class:Vector
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.
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set
public E set(int index, E element)
Description copied from class:Vector
Method to set the element at a position in the Vector.
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setElementAt
public void setElementAt(E element, int index)
Description copied from class:Vector
Method to set the element at a position in the Vector.- Overrides:
setElementAt
in classVector<E>
- Parameters:
element
- The new elementindex
- The position
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writeReplace
protected java.lang.Object writeReplace() throws java.io.ObjectStreamException
Description copied from class:Vector
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.- Overrides:
writeReplace
in classVector<E>
- Returns:
- the replaced object
- Throws:
java.io.ObjectStreamException
- if an error occurs
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spliterator
public java.util.Spliterator<E> spliterator()
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stream
public java.util.stream.Stream<E> stream()
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parallelStream
public java.util.stream.Stream<E> parallelStream()
- Specified by:
parallelStream
in interfacejava.util.Collection<E>
- Overrides:
parallelStream
in classVector<E>
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