org.hibernate.collection.internal

Class PersistentBag

java.lang.Object

org.hibernate.collection.internal.AbstractPersistentCollection

org.hibernate.collection.internal.PersistentBag

All Implemented Interfaces:

Serializable, Iterable, Collection, List, PersistentCollection

public class PersistentBag
extends AbstractPersistentCollection
implements List

An unordered, unkeyed collection that can contain the same element multiple times. The Java collections API, curiously, has no Bag. Most developers seem to use Lists to represent bag semantics, so Hibernate follows this practice.

Author:

Gavin King

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.hibernate.collection.internal.AbstractPersistentCollection

AbstractPersistentCollection.AbstractValueDelayedOperation, AbstractPersistentCollection.DelayedOperation, AbstractPersistentCollection.IteratorProxy, AbstractPersistentCollection.LazyInitializationWork<T>, AbstractPersistentCollection.ListIteratorProxy, AbstractPersistentCollection.ListProxy, AbstractPersistentCollection.SetProxy, AbstractPersistentCollection.ValueDelayedOperation

Field Summary

Fields

Modifier and Type	Field and Description
protected List	bag

Fields inherited from class org.hibernate.collection.internal.AbstractPersistentCollection

UNKNOWN

Constructor Summary

Constructors

Constructor and Description
PersistentBag() Constructs a PersistentBag.
PersistentBag(SessionImplementor session) Constructs a PersistentBag
PersistentBag(SessionImplementor session, Collection coll) Constructs a PersistentBag

Method Summary

Modifier and Type	Method and Description
void	add(int i, Object o)
boolean	add(Object object)
boolean	addAll(Collection values)
boolean	addAll(int i, Collection c)
void	beforeInitialize(CollectionPersister persister, int anticipatedSize) Called before any elements are read into the collection, allowing appropriate initializations to occur.
void	clear()
boolean	contains(Object object)
boolean	containsAll(Collection c)
Serializable	disassemble(CollectionPersister persister) Disassemble the collection to get it ready for the cache
boolean	empty() Is the collection empty? (don't try to initialize the collection)
Iterator	entries(CollectionPersister persister) Iterate all collection entries, during update of the database
boolean	entryExists(Object entry, int i) Does the given element/entry exist in the collection?
boolean	equals(Object obj) Bag does not respect the collection API and do an JVM instance comparison to do the equals.
boolean	equalsSnapshot(CollectionPersister persister) Does the current state exactly match the snapshot?
Object	get(int i)
Iterator	getDeletes(CollectionPersister persister, boolean indexIsFormula) Get all the elements that need deleting
Object	getElement(Object entry) Get the value of the given collection entry.
Object	getIndex(Object entry, int i, CollectionPersister persister) Get the index of the given collection entry
Collection	getOrphans(Serializable snapshot, String entityName) get all "orphaned" elements
Serializable	getSnapshot(CollectionPersister persister) Return a new snapshot of the current state of the collection
Object	getSnapshotElement(Object entry, int i) Get the snapshot value of the given collection entry
int	hashCode()
int	indexOf(Object o)
void	initializeFromCache(CollectionPersister persister, Serializable disassembled, Object owner) Read the state of the collection from a disassembled cached value
boolean	isEmpty()
boolean	isRowUpdatePossible() Can each element in the collection be mapped unequivocally to a single row in the database? Generally bags and sets are the only collections that cannot be.
boolean	isSnapshotEmpty(Serializable snapshot) Is the snapshot empty?
boolean	isWrapper(Object collection) Is this the wrapper for the given collection instance?
Iterator	iterator()
int	lastIndexOf(Object o)
ListIterator	listIterator()
ListIterator	listIterator(int i)
boolean	needsInserting(Object entry, int i, Type elemType) Do we need to insert this element?
boolean	needsRecreate(CollectionPersister persister) Do we need to completely recreate this collection when it changes?
boolean	needsUpdating(Object entry, int i, Type elemType) Do we need to update this element?
int	occurrences(Object o) Count how many times the given object occurs in the elements
Object	readFrom(ResultSet rs, CollectionPersister persister, CollectionAliases descriptor, Object owner) Read a row from the JDBC result set
Object	remove(int i)
boolean	remove(Object o)
boolean	removeAll(Collection c)
boolean	retainAll(Collection c)
Object	set(int i, Object o)
int	size()
List	subList(int start, int end)
Object[]	toArray()
Object[]	toArray(Object[] a)
String	toString()

Methods inherited from class org.hibernate.collection.internal.AbstractPersistentCollection

afterInitialize, afterRowInsert, beginRead, clearDirty, dirty, endRead, forceInitialization, getCachedSize, getIdentifier, getKey, getOrphans, getOwner, getQueuedOrphans, getRole, getSession, getSnapshot, getStoredSnapshot, getValue, hasQueuedOperations, identityRemove, initialize, isClearQueueEnabled, isConnectedToSession, isDirectlyAccessible, isDirty, isInitialized, isInverseCollection, isInverseCollectionNoOrphanDelete, isInverseOneToManyOrNoOrphanDelete, isOperationQueueEnabled, isPutQueueEnabled, isUnreferenced, performQueuedOperations, postAction, preInsert, prepareForPossibleLoadingOutsideTransaction, queuedAdditionIterator, queueOperation, read, readElementByIndex, readElementExistence, readIndexExistence, readSize, replaceQueuedOperationValues, setCurrentSession, setDirectlyAccessible, setInitialized, setOwner, setSnapshot, unsetSession, wasInitialized, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

replaceAll, sort, spliterator

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Field Detail

bag

protected List bag

Constructor Detail

PersistentBag

public PersistentBag()

Constructs a PersistentBag. Needed for SOAP libraries, etc

PersistentBag

public PersistentBag(SessionImplementor session)

Constructs a PersistentBag

Parameters:

session - The session

PersistentBag

public PersistentBag(SessionImplementor session,
                     Collection coll)

Constructs a PersistentBag

Parameters:

session - The session

coll - The base elements.

Method Detail

isWrapper

public boolean isWrapper(Object collection)

Description copied from interface: PersistentCollection

Is this the wrapper for the given collection instance?

Specified by:

isWrapper in interface PersistentCollection

Parameters:

collection - The collection to check whether this is wrapping it

Returns:

true if this is a wrapper around that given collection instance.

empty

public boolean empty()

Description copied from interface: PersistentCollection

Is the collection empty? (don't try to initialize the collection)

Specified by:

empty in interface PersistentCollection

Specified by:

empty in class AbstractPersistentCollection

Returns:

false if the collection is non-empty; true otherwise.

entries

public Iterator entries(CollectionPersister persister)

Description copied from interface: PersistentCollection

Iterate all collection entries, during update of the database

Specified by:

entries in interface PersistentCollection

Parameters:

persister - The collection persister.

Returns:

The iterator

readFrom

public Object readFrom(ResultSet rs,
                       CollectionPersister persister,
                       CollectionAliases descriptor,
                       Object owner)
                throws HibernateException,
                       SQLException

Description copied from interface: PersistentCollection

Read a row from the JDBC result set

Specified by:

readFrom in interface PersistentCollection

Parameters:

rs - The JDBC ResultSet

persister - The collection role

descriptor - The aliases used for the columns making up the collection

owner - The collection owner

Returns:

The read object

Throws:

HibernateException - Generally indicates a problem resolving data read from the ResultSet

SQLException - Indicates a problem accessing the ResultSet

beforeInitialize

public void beforeInitialize(CollectionPersister persister,
                             int anticipatedSize)

Description copied from interface: PersistentCollection

Called before any elements are read into the collection, allowing appropriate initializations to occur.

Specified by:

beforeInitialize in interface PersistentCollection

Parameters:

persister - The underlying collection persister.

anticipatedSize - The anticipated size of the collection after initialization is complete.

equalsSnapshot

public boolean equalsSnapshot(CollectionPersister persister)
                       throws HibernateException

Description copied from interface: PersistentCollection

Does the current state exactly match the snapshot?

Specified by:

equalsSnapshot in interface PersistentCollection

Parameters:

persister - The collection persister

Returns:

true if the current state and the snapshot state match.

Throws:

HibernateException

isSnapshotEmpty

public boolean isSnapshotEmpty(Serializable snapshot)

Description copied from interface: PersistentCollection

Is the snapshot empty?

Specified by:

isSnapshotEmpty in interface PersistentCollection

Parameters:

snapshot - The snapshot to check

Returns:

true if the given snapshot is empty

getSnapshot

public Serializable getSnapshot(CollectionPersister persister)
                         throws HibernateException

Description copied from interface: PersistentCollection

Return a new snapshot of the current state of the collection

Specified by:

getSnapshot in interface PersistentCollection

Parameters:

persister - The collection persister

Returns:

The snapshot

Throws:

HibernateException

getOrphans

public Collection getOrphans(Serializable snapshot,
                             String entityName)
                      throws HibernateException

Description copied from interface: PersistentCollection

get all "orphaned" elements

Specified by:

getOrphans in interface PersistentCollection

Specified by:

getOrphans in class AbstractPersistentCollection

Parameters:

snapshot - The snapshot state

entityName - The name of the entity that are the elements of the collection

Returns:

The orphans

Throws:

HibernateException

disassemble

public Serializable disassemble(CollectionPersister persister)
                         throws HibernateException

Description copied from interface: PersistentCollection

Disassemble the collection to get it ready for the cache

Specified by:

disassemble in interface PersistentCollection

Parameters:

persister - The collection persister

Returns:

The disassembled state

Throws:

HibernateException

initializeFromCache

public void initializeFromCache(CollectionPersister persister,
                                Serializable disassembled,
                                Object owner)
                         throws HibernateException

Description copied from interface: PersistentCollection

Read the state of the collection from a disassembled cached value

Specified by:

initializeFromCache in interface PersistentCollection

Parameters:

persister - The collection persister

disassembled - The disassembled cached state

owner - The collection owner

Throws:

HibernateException

needsRecreate

public boolean needsRecreate(CollectionPersister persister)

Description copied from interface: PersistentCollection

Do we need to completely recreate this collection when it changes?

Specified by:

needsRecreate in interface PersistentCollection

Overrides:

needsRecreate in class AbstractPersistentCollection

Parameters:

persister - The collection persister

Returns:

true if a change requires a recreate.

getDeletes

public Iterator getDeletes(CollectionPersister persister,
                           boolean indexIsFormula)
                    throws HibernateException

Description copied from interface: PersistentCollection

Get all the elements that need deleting

Specified by:

getDeletes in interface PersistentCollection

Parameters:

persister - The collection persister

indexIsFormula - For indexed collections, tells whether the index is a formula (calculated value) mapping

Returns:

An iterator over the elements to delete

Throws:

HibernateException

needsInserting

public boolean needsInserting(Object entry,
                              int i,
                              Type elemType)
                       throws HibernateException

Description copied from interface: PersistentCollection

Do we need to insert this element?

Specified by:

needsInserting in interface PersistentCollection

Parameters:

entry - The collection element to check

i - The index (for indexed collections)

elemType - The type for the element

Returns:

true if the element needs inserting

Throws:

HibernateException

isRowUpdatePossible

public boolean isRowUpdatePossible()

Description copied from interface: PersistentCollection

Can each element in the collection be mapped unequivocally to a single row in the database? Generally bags and sets are the only collections that cannot be.

Specified by:

isRowUpdatePossible in interface PersistentCollection

Overrides:

isRowUpdatePossible in class AbstractPersistentCollection

Returns:

true if the row for each element is known

needsUpdating

public boolean needsUpdating(Object entry,
                             int i,
                             Type elemType)

Description copied from interface: PersistentCollection

Do we need to update this element?

Specified by:

needsUpdating in interface PersistentCollection

Parameters:

entry - The collection element to check

i - The index (for indexed collections)

elemType - The type for the element

Returns:

true if the element needs updating

size

public int size()

Specified by:

size in interface Collection

Specified by:

size in interface List

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection

Specified by:

isEmpty in interface List

contains

public boolean contains(Object object)

Specified by:

contains in interface Collection

Specified by:

contains in interface List

iterator

public Iterator iterator()

Specified by:

iterator in interface Iterable

Specified by:

iterator in interface Collection

Specified by:

iterator in interface List

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection

Specified by:

toArray in interface List

toArray

public Object[] toArray(Object[] a)

Specified by:

toArray in interface Collection

Specified by:

toArray in interface List

add

public boolean add(Object object)

Specified by:

add in interface Collection

Specified by:

add in interface List

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection

Specified by:

remove in interface List

containsAll

public boolean containsAll(Collection c)

Specified by:

containsAll in interface Collection

Specified by:

containsAll in interface List

addAll

public boolean addAll(Collection values)

Specified by:

addAll in interface Collection

Specified by:

addAll in interface List

removeAll

public boolean removeAll(Collection c)

Specified by:

removeAll in interface Collection

Specified by:

removeAll in interface List

retainAll

public boolean retainAll(Collection c)

Specified by:

retainAll in interface Collection

Specified by:

retainAll in interface List

clear

public void clear()

Specified by:

clear in interface Collection

Specified by:

clear in interface List

getIndex

public Object getIndex(Object entry,
                       int i,
                       CollectionPersister persister)

Description copied from interface: PersistentCollection

Get the index of the given collection entry

Specified by:

getIndex in interface PersistentCollection

Parameters:

entry - The collection entry/element

i - The assumed index

persister - it was more elegant before we added this...

Returns:

The index value

getElement

public Object getElement(Object entry)

Description copied from interface: PersistentCollection

Get the value of the given collection entry. Generally the given entry parameter value will just be returned. Might get a different value for a duplicate entries in a Set.

Specified by:

getElement in interface PersistentCollection

Parameters:

entry - The object instance for which to get the collection element instance.

Returns:

The corresponding object that is part of the collection elements.

getSnapshotElement

public Object getSnapshotElement(Object entry,
                                 int i)

Description copied from interface: PersistentCollection

Get the snapshot value of the given collection entry

Specified by:

getSnapshotElement in interface PersistentCollection

Parameters:

entry - The entry

i - The index

Returns:

The snapshot state for that element

occurrences

public int occurrences(Object o)

Count how many times the given object occurs in the elements

Parameters:

o - The object to check

Returns:

The number of occurences.

add

public void add(int i,
                Object o)

Specified by:

add in interface List

addAll

public boolean addAll(int i,
                      Collection c)

Specified by:

addAll in interface List

get

public Object get(int i)

Specified by:

get in interface List

indexOf

public int indexOf(Object o)

Specified by:

indexOf in interface List

lastIndexOf

public int lastIndexOf(Object o)

Specified by:

lastIndexOf in interface List

listIterator

public ListIterator listIterator()

Specified by:

listIterator in interface List

listIterator

public ListIterator listIterator(int i)

Specified by:

listIterator in interface List

remove

public Object remove(int i)

Specified by:

remove in interface List

set

public Object set(int i,
                  Object o)

Specified by:

set in interface List

subList

public List subList(int start,
                    int end)

Specified by:

subList in interface List

entryExists

public boolean entryExists(Object entry,
                           int i)

Description copied from interface: PersistentCollection

Does the given element/entry exist in the collection?

Specified by:

entryExists in interface PersistentCollection

Parameters:

entry - The object to check if it exists as a collection element

i - Unused

Returns:

true if the given entry is a collection element

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Bag does not respect the collection API and do an JVM instance comparison to do the equals. The semantic is broken not to have to initialize a collection for a simple equals() operation.

Specified by:

equals in interface Collection

Specified by:

equals in interface List

Overrides:

equals in class Object

See Also:

{@inheritDoc}

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection

Specified by:

hashCode in interface List

Overrides:

hashCode in class Object