com.sun.jdo.spi.persistence.support.sqlstore.impl

Class PersistenceManagerWrapper

java.lang.Object

com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerWrapper

All Implemented Interfaces:

PersistenceManager

public class PersistenceManagerWrapper
extends Object
implements PersistenceManager

PersistenceManagerWrapper is ....

Method Summary

Modifier and Type	Method and Description
void	close() A PersistenceManager instance can be used until it is closed.
Transaction	currentTransaction() There is exactly one Transaction associated with a PersistenceManager.
void	deletePersistent(Collection pcs) Delete a Collection of instances from the data store.
void	deletePersistent(Object pc) Delete the persistent instance from the data store.
void	deletePersistent(Object[] pcs) Delete an array of instances from the data store.
Collection	getExtent(Class persistenceCapableClass, boolean subclasses) The PersistenceManager may manage a collection of instances in the data store based on the class of the instances.
Object	getObjectById(Object oid) This method locates a persistent instance in the cache of instances managed by this PersistenceManager.
Object	getObjectById(Object oid, boolean validate) This method locates a persistent instance in the cache of instances managed by this PersistenceManager.
Object	getObjectId(Object pc) The ObjectId returned by this method represents the JDO identity of the instance.
Class	getObjectIdClass(Class cls) In order for the application to construct instance of the ObjectId class it needs to know the class being used by the JDO implementation.
PersistenceManager	getPersistenceManager()
PersistenceManagerFactory	getPersistenceManagerFactory() This method returns the PersistenceManagerFactory used to create this PersistenceManager.
Properties	getProperties() The JDO vendor might store certain non-operational properties and make those properties available to applications (for troubleshooting).
boolean	getRequireCopyObjectId() Returns the boolean value of the requireCopyObjectId flag for this PersistenceManager.
boolean	getRequireTrackedSCO() Returns the boolean value of the requireTrackedSCO flag for this PersistenceManager.
boolean	getSupersedeDeletedInstance() Returns the boolean value of the supersedeDeletedInstance flag for this PersistenceManager.
Object	getTransactionalInstance(Object pc) This method is used to get a PersistenceCapable instance representing the same data store object as the parameter, that is valid for this PersistenceManager.
Object	getUserObject() The application can manage the PersistenceManager instances more easily by having an application object associated with each PersistenceManager instance.
boolean	isClosed() A PersistenceManager instance can be used until it is closed.
void	makePersistent(Collection pcs) Make a Collection of instances persistent.
void	makePersistent(Object pc) Make the transient instance persistent in this PersistenceManager.
void	makePersistent(Object[] pcs) Make an array of instances persistent.
Object	newCollectionInstance(Class type, Object owner, String fieldName, Class elementType, boolean allowNulls, int initialSize) Returns a new Collection instance of the type specified, with the owner and field name to notify upon changes to the value of any of its fields.
Query	newQuery() Create a new Query with no elements.
Query	newQuery(Class cls) Create a new Query specifying the Class of the results.
Query	newQuery(Class cls, Collection cln) Create a new Query with the Class of the results and candidate Collection.
Query	newQuery(Class cls, Collection cln, String filter) Create a new Query with the Class of the results, candidate Collection, and Filter.
Query	newQuery(Class cls, String filter) Create a new Query with the Class of the results and Filter.
Query	newQuery(Object compiled) Create a new Query using elements from another Query.
Object	newSCOInstance(Class type, Object owner, String fieldName) Returns a new Second Class Object instance of the type specified, with the owner and field name to notify upon changes to the value of any of its fields.
void	setRequireCopyObjectId(boolean flag) Sets the requireCopyObjectId flag for this PersistenceManager.
void	setRequireTrackedSCO(boolean flag) Sets the requireTrackedSCO flag for this PersistenceManager.
void	setSupersedeDeletedInstance(boolean flag) Sets the supersedeDeletedInstance flag for this PersistenceManager.
void	setUserObject(Object o) The application can manage the PersistenceManager instances more easily by having an application object associated with each PersistenceManager instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isClosed

public boolean isClosed()

A PersistenceManager instance can be used until it is closed.

Specified by:

isClosed in interface PersistenceManager

Returns:

if this PersistenceManager has been closed

See Also:

close()

close

public void close()

A PersistenceManager instance can be used until it is closed.

This method closes the PersistenceManager, which if pooled, releases it to the pool of available PersistenceManagers.

Specified by:

close in interface PersistenceManager

currentTransaction

public Transaction currentTransaction()

There is exactly one Transaction associated with a PersistenceManager.

Specified by:

currentTransaction in interface PersistenceManager

Returns:

the Transaction associated with this PersistenceManager.

newQuery

public Query newQuery()

Create a new Query with no elements.

Specified by:

newQuery in interface PersistenceManager

Returns:

a new Query instance with no elements.

newQuery

public Query newQuery(Object compiled)

Create a new Query using elements from another Query. The other Query must have been created by the same JDO implementation. It might be active in a different PersistenceManager or might have been serialized and restored.

Specified by:

newQuery in interface PersistenceManager

Parameters:

compiled - another Query from the same JDO implementation

Returns:

the new Query

newQuery

public Query newQuery(Class cls)

Create a new Query specifying the Class of the results.

Specified by:

newQuery in interface PersistenceManager

Parameters:

cls - the Class of the results

Returns:

the new Query

newQuery

public Query newQuery(Class cls,
                      Collection cln)

Create a new Query with the Class of the results and candidate Collection. specified.

Specified by:

newQuery in interface PersistenceManager

Parameters:

cls - the Class of results

cln - the Collection of candidate instances

Returns:

the new Query

newQuery

public Query newQuery(Class cls,
                      String filter)

Create a new Query with the Class of the results and Filter. specified.

Specified by:

newQuery in interface PersistenceManager

Parameters:

cls - the Class of results

filter - the Filter for candidate instances

Returns:

the new Query

newQuery

public Query newQuery(Class cls,
                      Collection cln,
                      String filter)

Create a new Query with the Class of the results, candidate Collection, and Filter.

Specified by:

newQuery in interface PersistenceManager

Parameters:

cls - the Class of results

cln - the Collection of candidate instances

filter - the Filter for candidate instances

Returns:

the new Query

getExtent

public Collection getExtent(Class persistenceCapableClass,
                            boolean subclasses)

The PersistenceManager may manage a collection of instances in the data store based on the class of the instances. This method returns a Collection of instances in the data store that might be iterated or given to a Query as the Collection of candidate instances.

Specified by:

getExtent in interface PersistenceManager

Parameters:

persistenceCapableClass - Class of instances

subclasses - whether to include instances of subclasses

Returns:

a Collection of instances

See Also:

Query

getObjectById

public Object getObjectById(Object oid)

This method locates a persistent instance in the cache of instances managed by this PersistenceManager. If an instance with the same ObjectId is found it is returned. Otherwise, a new instance is created and associated with the ObjectId.

If the instance does not exist in the data store, then this method will not fail. However, a request to access fields of the instance will throw an exception.

Specified by:

getObjectById in interface PersistenceManager

Parameters:

oid - an ObjectId

Returns:

the PersistenceCapable instance with the specified ObjectId

getObjectById

public Object getObjectById(Object oid,
                            boolean validate)

This method locates a persistent instance in the cache of instances managed by this PersistenceManager. The getObjectById method attempts to find an instance in the cache with the specified JDO identity. The oid parameter object might have been returned by an earlier call to getObjectId or might have been constructed by the application.

If the PersistenceManager is unable to resolve the oid parameter to an ObjectId instance, then it throws a JDOUserException.

If the validate flag is false, and there is already an instance in the cache with the same JDO identity as the oid parameter, then this method returns it. There is no change made to the state of the returned instance.

If there is not an instance already in the cache with the same JDO identity as the oid parameter, then this method creates an instance with the specified JDO identity and returns it. If there is no transaction in progress, the returned instance will be hollow or persistent-nontransactional, at the choice of the implementation.

If there is a transaction in progress, the returned instance will be hollow, persistent-nontransactional, or persistent-clean, at the choice of the implementation.

Specified by:

getObjectById in interface PersistenceManager

Parameters:

oid - an ObjectId

validate - if the existence of the instance is to be validated

Returns:

the PersistenceCapable instance with the specified ObjectId

See Also:

getObjectId(Object pc)

getObjectId

public Object getObjectId(Object pc)

The ObjectId returned by this method represents the JDO identity of the instance. The ObjectId is a copy (clone) of the internal state of the instance, and changing it does not affect the JDO identity of the instance.

Specified by:

getObjectId in interface PersistenceManager

Parameters:

pc - the PersistenceCapable instance

Returns:

the ObjectId of the instance

getTransactionalInstance

public Object getTransactionalInstance(Object pc)

This method is used to get a PersistenceCapable instance representing the same data store object as the parameter, that is valid for this PersistenceManager.

Specified by:

getTransactionalInstance in interface PersistenceManager

Parameters:

pc - a PersistenceCapable instance

Returns:

the PersistenceCapable instance representing the same data store object

makePersistent

public void makePersistent(Object pc)

Make the transient instance persistent in this PersistenceManager. This method must be called in an active transaction. The PersistenceManager assigns an ObjectId to the instance and transitions it to persistent-new. The instance will be managed in the Extent associated with its Class. The instance will be put into the data store at commit.

Specified by:

makePersistent in interface PersistenceManager

Parameters:

pc - a transient instance of a Class that implements PersistenceCapable

makePersistent

public void makePersistent(Object[] pcs)

Make an array of instances persistent.

Specified by:

makePersistent in interface PersistenceManager

Parameters:

pcs - an array of transient instances

See Also:

makePersistent(Object pc)

makePersistent

public void makePersistent(Collection pcs)

Make a Collection of instances persistent.

Specified by:

makePersistent in interface PersistenceManager

Parameters:

pcs - a Collection of transient instances

See Also:

makePersistent(Object pc)

deletePersistent

public void deletePersistent(Object pc)

Delete the persistent instance from the data store. This method must be called in an active transaction. The data store object will be removed at commit. Unlike makePersistent, which makes the closure of the instance persistent, the closure of the instance is not deleted from the data store. This method has no effect if the instance is already deleted in the current transaction. This method throws an exception if the instance is transient or is managed by another PersistenceManager.

Specified by:

deletePersistent in interface PersistenceManager

Parameters:

pc - a persistent instance

deletePersistent

public void deletePersistent(Object[] pcs)

Delete an array of instances from the data store.

Specified by:

deletePersistent in interface PersistenceManager

Parameters:

pcs - a Collection of persistent instances

See Also:

deletePersistent(Object pc)

deletePersistent

public void deletePersistent(Collection pcs)

Delete a Collection of instances from the data store.

Specified by:

deletePersistent in interface PersistenceManager

Parameters:

pcs - a Collection of persistent instances

See Also:

deletePersistent(Object pc)

getPersistenceManagerFactory

public PersistenceManagerFactory getPersistenceManagerFactory()

This method returns the PersistenceManagerFactory used to create this PersistenceManager. It returns null if this instance was created via a constructor.

Specified by:

getPersistenceManagerFactory in interface PersistenceManager

Returns:

the PersistenceManagerFactory that created this PersistenceManager

setUserObject

public void setUserObject(Object o)

The application can manage the PersistenceManager instances more easily by having an application object associated with each PersistenceManager instance.

Specified by:

setUserObject in interface PersistenceManager

Parameters:

o - the user instance to be remembered by the PersistenceManager

See Also:

getUserObject()

getUserObject

public Object getUserObject()

The application can manage the PersistenceManager instances more easily by having an application object associated with each PersistenceManager instance.

Specified by:

getUserObject in interface PersistenceManager

Returns:

the user object associated with this PersistenceManager

See Also:

setUserObject(java.lang.Object)

getProperties

public Properties getProperties()

The JDO vendor might store certain non-operational properties and make those properties available to applications (for troubleshooting).

Standard properties include:

VendorName VersionNumber

Specified by:

getProperties in interface PersistenceManager

Returns:

the Properties of this PersistenceManager

getSupersedeDeletedInstance

public boolean getSupersedeDeletedInstance()

Returns the boolean value of the supersedeDeletedInstance flag for this PersistenceManager. If set to true, deleted instances are allowed to be replaced with persistent-new instances with the equal Object Id.

Specified by:

getSupersedeDeletedInstance in interface PersistenceManager

Returns:

boolean supersedeDeletedInstance flag

setSupersedeDeletedInstance

public void setSupersedeDeletedInstance(boolean flag)

Sets the supersedeDeletedInstance flag for this PersistenceManager.

Specified by:

setSupersedeDeletedInstance in interface PersistenceManager

Parameters:

flag - boolean supersedeDeletedInstance flag

getRequireCopyObjectId

public boolean getRequireCopyObjectId()

Returns the boolean value of the requireCopyObjectId flag for this PersistenceManager. If set to false, the PersistenceManager does not create a copy of an ObjectId for PersistenceManager.getObjectId(Object pc) and PersistenceManager.getObjectById(Object oid) requests.

Specified by:

getRequireCopyObjectId in interface PersistenceManager

Returns:

boolean requireCopyObjectId flag

See Also:

PersistenceManager.getObjectId(Object pc), PersistenceManager.getObjectById(Object oid)

setRequireCopyObjectId

public void setRequireCopyObjectId(boolean flag)

Sets the requireCopyObjectId flag for this PersistenceManager. If set to false, the PersistenceManager will not create a copy of an ObjectId for PersistenceManager.getObjectId(Object pc) and PersistenceManager.getObjectById(Object oid) requests.

Specified by:

setRequireCopyObjectId in interface PersistenceManager

Parameters:

flag - boolean requireCopyObjectId flag

See Also:

PersistenceManager.getObjectId(Object pc), PersistenceManager.getObjectById(Object oid)

getRequireTrackedSCO

public boolean getRequireTrackedSCO()

Returns the boolean value of the requireTrackedSCO flag for this PersistenceManager. If set to false, the PersistenceManager will not create tracked SCO instances for new persistent instances at commit with retainValues set to true and while retrieving data from a datastore.

Specified by:

getRequireTrackedSCO in interface PersistenceManager

Returns:

boolean requireTrackedSCO flag

setRequireTrackedSCO

public void setRequireTrackedSCO(boolean flag)

Sets the requireTrackedSCO flag for this PersistenceManager. If set to false, the PersistenceManager will not create tracked SCO instances for new persistent instances at commit with retainValues set to true and while retrieving data from a datastore.

Specified by:

setRequireTrackedSCO in interface PersistenceManager

Parameters:

flag - boolean requireTrackedSCO flag

getObjectIdClass

public Class getObjectIdClass(Class cls)

In order for the application to construct instance of the ObjectId class it needs to know the class being used by the JDO implementation.

Specified by:

getObjectIdClass in interface PersistenceManager

Parameters:

cls - the PersistenceCapable Class

Returns:

the Class of the ObjectId of the parameter

newSCOInstance

public Object newSCOInstance(Class type,
                             Object owner,
                             String fieldName)

Returns a new Second Class Object instance of the type specified, with the owner and field name to notify upon changes to the value of any of its fields. If a collection class is created, then the class does not restrict the element types, and allows nulls to be added as elements.

Specified by:

newSCOInstance in interface PersistenceManager

Parameters:

type - Class of the new SCO instance

owner - the owner to notify upon changes

fieldName - the field to notify upon changes

Returns:

the object of the class type

newCollectionInstance

public Object newCollectionInstance(Class type,
                                    Object owner,
                                    String fieldName,
                                    Class elementType,
                                    boolean allowNulls,
                                    int initialSize)

Returns a new Collection instance of the type specified, with the owner and field name to notify upon changes to the value of any of its fields. The collection class restricts the element types allowed to the elementType or instances assignable to the elementType, and allows nulls to be added as elements based on the setting of allowNulls. The Collection has an initial size as specified by the initialSize parameter.

Specified by:

newCollectionInstance in interface PersistenceManager

Parameters:

type - Class of the new SCO instance

owner - the owner to notify upon changes

fieldName - the field to notify upon changes

elementType - the element types allowed

allowNulls - true if allowed

initialSize - initial size of the Collection

Returns:

the object of the class type

getPersistenceManager

public PersistenceManager getPersistenceManager()