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AbstractPersistentCollection (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.collection
Class AbstractPersistentCollection

java.lang.Object
  extended byorg.hibernate.collection.AbstractPersistentCollection
All Implemented Interfaces:
PersistentCollection, Serializable
Direct Known Subclasses:
PersistentArrayHolder, PersistentBag, PersistentElementHolder, PersistentIdentifierBag, PersistentIndexedElementHolder, PersistentList, PersistentMap, PersistentSet
public abstract class AbstractPersistentCollection
extends Object
implements Serializable, PersistentCollection

Base class implementing PersistentCollection

Author:
Gavin King
See Also:
PersistentCollection, Serialized Form

Nested Class Summary
protected static interface AbstractPersistentCollection.DelayedOperation
           
 
Field Summary
protected static Object UNKNOWN
           
 
Constructor Summary
  AbstractPersistentCollection()
          Not called by Hibernate, but used by non-JDK serialization, eg.
protected AbstractPersistentCollection(SessionImplementor session)
           
 
Method Summary
 boolean afterInitialize()
          Called after initializing from cache
 void afterRowInsert(CollectionPersister persister, Object entry, int i)
          Called after inserting a row, to fetch the natively generated id
 void beginRead()
          Called just before reading any rows from the JDBC result set
 void clearDirty()
          Clear the dirty flag, after flushing changes to the database.
 void dirty()
          Mark the collection as dirty
abstract  boolean empty()
          Is the initialized collection empty?
 boolean endRead()
          Called after reading all rows from the JDBC result set
 void forceInitialization()
          To be called internally by the session, forcing immediate initialization.
protected  int getCachedSize()
           
 Object getIdentifier(Object entry, int i)
          Get the index of the given collection entry
 Serializable getKey()
          Get the current collection key value
protected static Collection getOrphans(Collection oldElements, Collection currentElements, String entityName, SessionImplementor session)
          Given a collection of entity instances that used to belong to the collection, and a collection of instances that currently belong, return a collection of orphans
abstract  Collection getOrphans(Serializable snapshot, String entityName)
          get all "orphaned" elements
 Object getOwner()
          Get the owning entity.
 Collection getQueuedOrphans(String entityName)
          Iterate the "queued" additions
 String getRole()
          Get the current role name
 SessionImplementor getSession()
          Get the current session
protected  Serializable getSnapshot()
          Get the current snapshot from the session
 Serializable getStoredSnapshot()
          Get the snapshot cached by the collection instance
 Object getValue()
          return the user-visible collection (or array) instance
 boolean hasQueuedOperations()
          Does this instance have any "queued" additions?
protected  void initialize(boolean writing)
          Initialize the collection, if possible, wrapping any exceptions in a runtime exception
protected  boolean isClearQueueEnabled()
          Is this collection in a state that would allow us to "queue" clear? This is a special case, because of orphan delete.
 boolean isDirectlyAccessible()
          Could the application possibly have a direct reference to the underlying collection implementation?
 boolean isDirty()
          Is the collection dirty? Note that this is only reliable during the flush cycle, after the collection elements are dirty checked against the snapshot.
protected  boolean isOperationQueueEnabled()
          Is this collection in a state that would allow us to "queue" operations?
protected  boolean isPutQueueEnabled()
          Is this collection in a state that would allow us to "queue" puts? This is a special case, because of orphan delete.
 boolean isRowUpdatePossible()
           
 boolean isUnreferenced()
          Is the collection unreferenced?
 boolean needsRecreate(CollectionPersister persister)
          Do we need to completely recreate this collection when it changes?
protected  void performQueuedOperations()
          After reading all existing elements from the database, add the queued elements to the underlying collection.
 void postAction()
          After flushing, clear any "queued" additions, since the database state is now synchronized with the memory state.
 void preInsert(CollectionPersister persister)
          Called before inserting rows, to ensure that any surrogate keys are fully generated
 Iterator queuedAdditionIterator()
          Iterate the "queued" additions
protected  void queueOperation(Object element)
          Queue an addition
protected  void read()
          Called by any read-only method of the collection interface
protected  Object readElementByIndex(Object index)
           
protected  Boolean readElementExistence(Object element)
           
protected  Boolean readIndexExistence(Object index)
           
protected  boolean readSize()
          Called by the size() method
 boolean setCurrentSession(SessionImplementor session)
          Associate the collection with the given session.
protected  void setDirectlyAccessible(boolean directlyAccessible)
           
protected  void setInitialized()
           
 void setOwner(Object owner)
          Set the reference to the owning entity
 void setSnapshot(Serializable key, String role, Serializable snapshot)
          After flushing, re-init snapshot state.
 boolean unsetSession(SessionImplementor currentSession)
          Disassociate this collection from the given session.
 boolean wasInitialized()
          Is this instance initialized?
protected  void write()
          Called by any writer method of the collection interface
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.hibernate.collection.PersistentCollection
beforeInitialize, disassemble, entries, entryExists, equalsSnapshot, getDeletes, getElement, getIndex, getSnapshot, getSnapshotElement, initializeFromCache, isSnapshotEmpty, isWrapper, needsInserting, needsUpdating, readFrom
 

Field Detail

UNKNOWN

protected static final Object UNKNOWN
Constructor Detail

AbstractPersistentCollection

public AbstractPersistentCollection()
Not called by Hibernate, but used by non-JDK serialization, eg. SOAP libraries.

AbstractPersistentCollection

protected AbstractPersistentCollection(SessionImplementor session)
Method Detail

getRole

public final String getRole()
Description copied from interface: PersistentCollection
Get the current role name

Specified by:
getRole in interface PersistentCollection

getKey

public final Serializable getKey()
Description copied from interface: PersistentCollection
Get the current collection key value

Specified by:
getKey in interface PersistentCollection

isUnreferenced

public final boolean isUnreferenced()
Description copied from interface: PersistentCollection
Is the collection unreferenced?

Specified by:
isUnreferenced in interface PersistentCollection

isDirty

public final boolean isDirty()
Description copied from interface: PersistentCollection
Is the collection dirty? Note that this is only reliable during the flush cycle, after the collection elements are dirty checked against the snapshot.

Specified by:
isDirty in interface PersistentCollection

clearDirty

public final void clearDirty()
Description copied from interface: PersistentCollection
Clear the dirty flag, after flushing changes to the database.

Specified by:
clearDirty in interface PersistentCollection

dirty

public final void dirty()
Description copied from interface: PersistentCollection
Mark the collection as dirty

Specified by:
dirty in interface PersistentCollection

getStoredSnapshot

public final Serializable getStoredSnapshot()
Description copied from interface: PersistentCollection
Get the snapshot cached by the collection instance

Specified by:
getStoredSnapshot in interface PersistentCollection

empty

public abstract boolean empty()
Is the initialized collection empty?

Specified by:
empty in interface PersistentCollection

read

protected final void read()
Called by any read-only method of the collection interface

readSize

protected boolean readSize()
Called by the size() method

readIndexExistence

protected Boolean readIndexExistence(Object index)

readElementExistence

protected Boolean readElementExistence(Object element)

readElementByIndex

protected Object readElementByIndex(Object index)

getCachedSize

protected int getCachedSize()

write

protected final void write()
Called by any writer method of the collection interface

isOperationQueueEnabled

protected boolean isOperationQueueEnabled()
Is this collection in a state that would allow us to "queue" operations?

isPutQueueEnabled

protected boolean isPutQueueEnabled()
Is this collection in a state that would allow us to "queue" puts? This is a special case, because of orphan delete.

isClearQueueEnabled

protected boolean isClearQueueEnabled()
Is this collection in a state that would allow us to "queue" clear? This is a special case, because of orphan delete.

queueOperation

protected final void queueOperation(Object element)
Queue an addition

performQueuedOperations

protected final void performQueuedOperations()
After reading all existing elements from the database, add the queued elements to the underlying collection.

setSnapshot

public void setSnapshot(Serializable key,
                        String role,
                        Serializable snapshot)
After flushing, re-init snapshot state.

Specified by:
setSnapshot in interface PersistentCollection

postAction

public void postAction()
After flushing, clear any "queued" additions, since the database state is now synchronized with the memory state.

Specified by:
postAction in interface PersistentCollection

getValue

public Object getValue()
return the user-visible collection (or array) instance

Specified by:
getValue in interface PersistentCollection

beginRead

public void beginRead()
Called just before reading any rows from the JDBC result set

Specified by:
beginRead in interface PersistentCollection

endRead

public boolean endRead()
Called after reading all rows from the JDBC result set

Specified by:
endRead in interface PersistentCollection

afterInitialize

public boolean afterInitialize()
Description copied from interface: PersistentCollection
Called after initializing from cache

Specified by:
afterInitialize in interface PersistentCollection

initialize

protected final void initialize(boolean writing)
Initialize the collection, if possible, wrapping any exceptions in a runtime exception

Parameters:
writing - currently obsolete
Throws:
LazyInitializationException - if we cannot initialize

setInitialized

protected final void setInitialized()

setDirectlyAccessible

protected final void setDirectlyAccessible(boolean directlyAccessible)

isDirectlyAccessible

public boolean isDirectlyAccessible()
Could the application possibly have a direct reference to the underlying collection implementation?

Specified by:
isDirectlyAccessible in interface PersistentCollection

unsetSession

public final boolean unsetSession(SessionImplementor currentSession)
Disassociate this collection from the given session.

Specified by:
unsetSession in interface PersistentCollection
Returns:
true if this was currently associated with the given session

setCurrentSession

public final boolean setCurrentSession(SessionImplementor session)
                                throws HibernateException
Associate the collection with the given session.

Specified by:
setCurrentSession in interface PersistentCollection
Returns:
false if the collection was already associated with the session
Throws:
HibernateException - if the collection was already associated with another open session

needsRecreate

public boolean needsRecreate(CollectionPersister persister)
Do we need to completely recreate this collection when it changes?

Specified by:
needsRecreate in interface PersistentCollection

forceInitialization

public final void forceInitialization()
                               throws HibernateException
To be called internally by the session, forcing immediate initialization.

Specified by:
forceInitialization in interface PersistentCollection
Throws:
HibernateException

getSnapshot

protected final Serializable getSnapshot()
Get the current snapshot from the session

wasInitialized

public final boolean wasInitialized()
Is this instance initialized?

Specified by:
wasInitialized in interface PersistentCollection

isRowUpdatePossible

public boolean isRowUpdatePossible()
Specified by:
isRowUpdatePossible in interface PersistentCollection

hasQueuedOperations

public final boolean hasQueuedOperations()
Does this instance have any "queued" additions?

Specified by:
hasQueuedOperations in interface PersistentCollection

queuedAdditionIterator

public final Iterator queuedAdditionIterator()
Iterate the "queued" additions

Specified by:
queuedAdditionIterator in interface PersistentCollection

getQueuedOrphans

public final Collection getQueuedOrphans(String entityName)
Iterate the "queued" additions

Specified by:
getQueuedOrphans in interface PersistentCollection

preInsert

public void preInsert(CollectionPersister persister)
               throws HibernateException
Called before inserting rows, to ensure that any surrogate keys are fully generated

Specified by:
preInsert in interface PersistentCollection
Throws:
HibernateException

afterRowInsert

public void afterRowInsert(CollectionPersister persister,
                           Object entry,
                           int i)
                    throws HibernateException
Called after inserting a row, to fetch the natively generated id

Specified by:
afterRowInsert in interface PersistentCollection
Throws:
HibernateException

getOrphans

public abstract Collection getOrphans(Serializable snapshot,
                                      String entityName)
                               throws HibernateException
get all "orphaned" elements

Specified by:
getOrphans in interface PersistentCollection
Throws:
HibernateException

getSession

public final SessionImplementor getSession()
Get the current session

getOrphans

protected static Collection getOrphans(Collection oldElements,
                                       Collection currentElements,
                                       String entityName,
                                       SessionImplementor session)
                                throws HibernateException
Given a collection of entity instances that used to belong to the collection, and a collection of instances that currently belong, return a collection of orphans

Throws:
HibernateException

getIdentifier

public Object getIdentifier(Object entry,
                            int i)
Description copied from interface: PersistentCollection
Get the index of the given collection entry

Specified by:
getIdentifier in interface PersistentCollection

getOwner

public Object getOwner()
Description copied from interface: PersistentCollection
Get the owning entity. Note that the owner is only set during the flush cycle, and when a new collection wrapper is created while loading an entity.

Specified by:
getOwner in interface PersistentCollection

setOwner

public void setOwner(Object owner)
Description copied from interface: PersistentCollection
Set the reference to the owning entity

Specified by:
setOwner in interface PersistentCollection
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