Class List<E>
java.lang.Object
java.util.AbstractCollection<E>
java.util.AbstractList<E>
org.datanucleus.store.types.wrappers.List<E>
org.datanucleus.store.types.wrappers.backed.List<E>
- All Implemented Interfaces:
Serializable
,Cloneable
,Iterable<E>
,Collection<E>
,List<E>
,SCO<List<E>>
,SCOCollection<List<E>,
,E> SCOContainer<List<E>>
,SCOList<List<E>,
,E> BackedSCO
A mutable second-class List object.
This class extends AbstractList, 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:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected boolean
protected boolean
protected boolean
Fields inherited from class org.datanucleus.store.types.wrappers.List
delegate, ownerMmd, ownerSM, sorting
Fields inherited from class java.util.AbstractList
modCount
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Constructor Summary
ConstructorsConstructorDescriptionList
(DNStateManager ownerSM, AbstractMemberMetaData mmd) Constructor, using StateManager of the "owner" and the field name. -
Method Summary
Modifier and TypeMethodDescriptionvoid
Method to add an element to the List at a position.boolean
Method to add an element to the Listboolean
addAll
(int index, Collection elements) Method to add a collection of elements.boolean
addAll
(Collection<? extends E> elements) Method to add a Collection to the ArrayList.void
clear()
Method to clear the Listclone()
Creates and returns a copy of this object.boolean
Accessor for whether an element is contained in the List.boolean
Accessor for whether a collection of elements are contained here.boolean
Equality operator.void
get
(int index) Method to retrieve an element no.getValue()
Accessor for the unwrapped value that we are wrapping.int
hashCode()
int
Method to the position of an element.void
Method to initialise the SCO for use.void
initialise
(List<E> c) Method to initialise the SCO from an existing value.void
initialise
(List<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 List is empty.boolean
isLoaded()
Method to return if the SCO has its contents loaded.iterator()
Accessor for an iterator for the Listint
lastIndexOf
(Object element) Method to retrieve the last position of the element.Method to retrieve a List iterator for the list.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
Method to load all elements from the "backing store" where appropriate.remove
(int index) Method to remove an element from the ArrayList.boolean
Method to remove (the first occurrence of) an element from the collectionboolean
Method to remove (the first occurrence of) an element from the collectionboolean
removeAll
(Collection elements) Method to remove a collection of elements from the List.boolean
Method to retain a Collection of elements (and remove all others).Method to set the element at a position in the ArrayList.wrapper addition that allows turning off of the dependent-field checks when doing the position setting.int
size()
Accessor for the size of the Liststream()
subList
(int from, int to) Accessor for the subList of elements between from and to of the ListObject[]
toArray()
<T> T[]
toArray
(T[] a) void
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
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.List
attachCopy, detachCopy, getFieldName, getOwner, makeDirty, setValue, sort
Methods inherited from class java.util.AbstractList
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.Collection
removeIf
Methods inherited from interface java.util.List
replaceAll
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Field Details
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backingStore
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allowNulls
protected transient boolean allowNulls -
useCache
protected transient boolean useCache -
isCacheLoaded
protected transient boolean isCacheLoaded
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Constructor Details
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List
Constructor, using StateManager of the "owner" and the field name.- Parameters:
ownerSM
- The owner StateManagermmd
- Metadata for the member
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Method Details
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initialise
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 classList<E>
- Parameters:
newValue
- New value (to wrap)oldValue
- Old value (to use in deciding what needs deleting etc)
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initialise
Method to initialise the SCO from an existing value.- Specified by:
initialise
in interfaceSCO<E>
- Overrides:
initialise
in classList<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 classList<E>
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getValue
Accessor for the unwrapped value that we are wrapping. -
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. -
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. -
loadFromStore
protected void loadFromStore()Method to load all elements from the "backing store" where appropriate. -
getBackingStore
- Specified by:
getBackingStore
in interfaceBackedSCO
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updateEmbeddedElement
Method to update an embedded element in this collection.- Specified by:
updateEmbeddedElement
in interfaceSCOCollection<List<E>,
E> - Overrides:
updateEmbeddedElement
in classList<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 classList<E>
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clone
Creates and returns 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
Description copied from class:List
Accessor for whether an element is contained in the List. -
containsAll
Description copied from class:List
Accessor for whether a collection of elements are contained here.- Specified by:
containsAll
in interfaceCollection<E>
- Specified by:
containsAll
in interfaceList<E>
- Overrides:
containsAll
in classList<E>
- Parameters:
c
- The collection of elements.- Returns:
- Whether they are contained.
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equals
Description copied from class:List
Equality operator. -
forEach
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get
Description copied from class:List
Method to retrieve an element no. -
hashCode
public int hashCode() -
indexOf
Description copied from class:List
Method to the position of an element. -
isEmpty
public boolean isEmpty()Description copied from class:List
Accessor for whether the List is empty. -
lastIndexOf
Description copied from class:List
Method to retrieve the last position of the element.- Specified by:
lastIndexOf
in interfaceList<E>
- Overrides:
lastIndexOf
in classList<E>
- Parameters:
element
- The element- Returns:
- The last position of this element in the List.
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iterator
Description copied from class:List
Accessor for an iterator for the List -
listIterator
Description copied from class:List
Method to retrieve a List iterator for the list.- Specified by:
listIterator
in interfaceList<E>
- Overrides:
listIterator
in classList<E>
- Returns:
- The iterator
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listIterator
Description copied from class:List
Method to retrieve a List iterator for the list from the index.- Specified by:
listIterator
in interfaceList<E>
- Overrides:
listIterator
in classList<E>
- Parameters:
index
- The start point- Returns:
- The iterator
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size
public int size()Description copied from class:List
Accessor for the size of the List -
subList
Description copied from class:List
Accessor for the subList of elements between from and to of the List -
toArray
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toArray
public <T> T[] toArray(T[] a) -
add
Description copied from class:List
Method to add an element to the List -
add
Description copied from class:List
Method to add an element to the List at a position. -
addAll
Description copied from class:List
Method to add a Collection to the ArrayList. -
addAll
Description copied from class:List
Method to add a collection of elements. -
clear
public void clear()Description copied from class:List
Method to clear the List -
remove
Description copied from class:List
Method to remove (the first occurrence of) an element from the collection -
remove
Description copied from class:List
Method to remove (the first occurrence of) an element from the collection -
remove
Description copied from class:List
Method to remove an element from the ArrayList. -
removeAll
Description copied from class:List
Method to remove a collection of elements from the List. -
retainAll
Description copied from class:List
Method to retain a Collection of elements (and remove all others). -
set
Description copied from class:List
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. -
set
Description copied from class:List
Method to set the element at a position in the ArrayList. -
writeReplace
Description copied from class:List
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 classList<E>
- Returns:
- the replaced object
- Throws:
ObjectStreamException
- if an error occurs
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spliterator
- Specified by:
spliterator
in interfaceCollection<E>
- Specified by:
spliterator
in interfaceIterable<E>
- Specified by:
spliterator
in interfaceList<E>
- Overrides:
spliterator
in classList<E>
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stream
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parallelStream
- Specified by:
parallelStream
in interfaceCollection<E>
- Overrides:
parallelStream
in classList<E>
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