org.datanucleus.jdo
Class JDOAdapter

java.lang.Object
  org.datanucleus.jdo.JDOAdapter

All Implemented Interfaces:

ApiAdapter

public class JDOAdapter
extends java.lang.Object
implements ApiAdapter

Adapter for the JDO API, to allow the DataNucleus core runtime to expose multiple APIs to clients.

Field Summary

protected static Localiser

LOCALISER

Constructor Summary

JDOAdapter()

Method Summary

boolean	allowDeleteOfNonPersistentObject() Whether the API allows deletion of a non-persistent object.
boolean	allowPersistOfDeletedObject() Whether the API allows (re-)persistence of a deleted object.
boolean	allowReadFieldOfDeletedObject() Whether the API allows reading a field of a deleted object.
boolean	clearLoadedFlagsOnDeleteObject() Whether the API requires clearing of the fields of an object when it is deleted.
boolean	getDefaultCascadeDeleteForField() Returns the default cascade-delete setting.
boolean	getDefaultCascadePersistForField() Returns the default cascade-persist.
boolean	getDefaultCascadeRefreshForField() Returns the default cascade-refresh setting.
boolean	getDefaultCascadeUpdateForField() Returns the default cascade-update setting.
java.util.Map	getDefaultFactoryProperties() Method to return the default factory properties for this API.
java.lang.RuntimeException	getExceptionForException(java.lang.String msg, java.lang.Exception e) Convenience method to return an exception to throw for this API when an unexpected exception occurs.
java.lang.Object	getIdForObject(java.lang.Object obj) Method to return the object identity for the passed persistable object.
java.lang.Class	getKeyTypeForSingleFieldIdentityType(java.lang.Class idType) Accessor for the type of the single field application-identity key given the single field identity type.
LifeCycleState	getLifeCycleState(int stateType) Returns the LifeCycleState for the state constant.
java.lang.String	getName() Accessor for the name of the API.
java.lang.Object	getNewApplicationIdentityObjectId(ClassLoaderResolver clr, AbstractClassMetaData acmd, java.lang.String value) Utility to create a new application identity when you know the metadata for the target class, and the toString() output of the identity.
java.lang.Object	getNewApplicationIdentityObjectId(java.lang.Class cls, java.lang.Object key) Method to return a new object identity for the specified class, and key (possibly toString() output).
java.lang.Object	getNewApplicationIdentityObjectId(java.lang.Object pc, AbstractClassMetaData cmd) Method to create a new object identity for the passed object with the supplied MetaData.
java.lang.Object	getNewSingleFieldIdentity(java.lang.Class idType, java.lang.Class pcType, java.lang.Object value) Utility to create a new SingleFieldIdentity using reflection when you know the type of the PersistenceCapable, and also which SingleFieldIdentity, and the value of the key.
java.lang.Object	getObjectId(StateManager sm) Accessor for the object id from the StateManager for this object.
ObjectManager	getObjectManager(java.lang.Object obj) Method to return the ObjectManager (if any) associated with the passed object.
java.lang.String	getObjectState(java.lang.Object obj) Accessor for the object state.
java.lang.Object	getPersistenceManager(java.lang.Object obj) Accessor for the persistence manager for this object.
java.lang.String	getSingleFieldIdentityClassNameForByte() Accessor for the class name to use for identities when there is a single Byte/byte field.
java.lang.String	getSingleFieldIdentityClassNameForChar() Accessor for the class name to use for identities when there is a single Character/char field.
java.lang.String	getSingleFieldIdentityClassNameForInt() Accessor for the class name to use for identities when there is a single Integer/int field.
java.lang.String	getSingleFieldIdentityClassNameForLong() Accessor for the class name to use for identities when there is a single Long/long field.
java.lang.String	getSingleFieldIdentityClassNameForObject() Accessor for the class name to use for identities when there is a single Object field.
java.lang.String	getSingleFieldIdentityClassNameForShort() Accessor for the class name to use for identities when there is a single Short/short field.
java.lang.String	getSingleFieldIdentityClassNameForString() Accessor for the class name to use for identities when there is a single String field.
java.lang.Class	getTargetClassForSingleFieldIdentity(java.lang.Object id) Accessor for the target class for the specified single field application-identity.
java.lang.String	getTargetClassNameForSingleFieldIdentity(java.lang.Object id) Accessor for the target class name for the specified single field identity.
java.lang.Object	getTargetKeyForSingleFieldIdentity(java.lang.Object id) Accessor for the key object for the specified single field application-identity.
java.lang.Object	getVersion(StateManager sm) Accessor for the version from the StateManager for this object.
java.lang.Object	getVersionForObject(java.lang.Object obj) Method to return the object version for the passed persistable object.
boolean	isDeleted(java.lang.Object obj) Accessor for whether the passed object is deleted.
boolean	isDetachable(java.lang.Object obj) Method to return if the passed object is detachable using this API.
boolean	isDetached(java.lang.Object obj) Accessor for whether the passed object is detached.
boolean	isDirty(java.lang.Object obj) Accessor for whether the passed object is dirty.
boolean	isLoaded(StateManager sm, int fieldNumber) Accessor for whether a field is loaded for the object managed by the StateManager
boolean	isNew(java.lang.Object obj) Accessor for whether the passed object is new.
boolean	isPersistable(java.lang.Class cls) Utility method to check if the specified class is of a type that can be persisted for this API.
boolean	isPersistable(java.lang.Object obj) Method to return if the passed object is persistable using this API.
boolean	isPersistent(java.lang.Object obj) Accessor for whether the passed object is persistent.
boolean	isSingleFieldIdentity(java.lang.Object id) Accessor for whether the passed identity is a valid single-field application-identity for this API.
boolean	isSingleFieldIdentityClass(java.lang.String className) Checks whether the passed class name is valid for a single field application-identity for this API.
boolean	isTransactional(java.lang.Object obj) Accessor for whether the passed object is transactional.
boolean	isValidPrimaryKeyClass(java.lang.Class pkClass, AbstractClassMetaData cmd, ClassLoaderResolver clr, int noOfPkFields) Utility to check if a primary-key class is valid.
void	makeFieldDirty(java.lang.Object obj, java.lang.String fieldName) Method to make the field dirty in the object.
StateManager	newStateManager(ObjectManager om, AbstractClassMetaData acmd) Method to create a new StateManager for the ObjectManager and class.

Methods inherited from class java.lang.Object

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

Field Detail

LOCALISER

protected static final Localiser LOCALISER

Constructor Detail

JDOAdapter

public JDOAdapter()

Method Detail

getName

public java.lang.String getName()

Accessor for the name of the API.

Specified by:

getName in interface ApiAdapter

Returns:

Name of the API

getObjectManager

public ObjectManager getObjectManager(java.lang.Object obj)

Method to return the ObjectManager (if any) associated with the passed object. Supports persistable objects, and PersistenceManager.

Specified by:

getObjectManager in interface ApiAdapter

Parameters:

obj - The object

Returns:

The ObjectManager

newStateManager

public StateManager newStateManager(ObjectManager om,
                                    AbstractClassMetaData acmd)

Method to create a new StateManager for the ObjectManager and class.

Specified by:

newStateManager in interface ApiAdapter

Parameters:

om - ObjectManager

acmd - MetaData for the class/interface

getLifeCycleState

public LifeCycleState getLifeCycleState(int stateType)

Returns the LifeCycleState for the state constant.

Specified by:

getLifeCycleState in interface ApiAdapter

Parameters:

stateType - the type as integer

Returns:

the type as LifeCycleState object

isPersistent

public boolean isPersistent(java.lang.Object obj)

Accessor for whether the passed object is persistent.

Specified by:

isPersistent in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is persistent

isNew

public boolean isNew(java.lang.Object obj)

Accessor for whether the passed object is new.

Specified by:

isNew in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is new

isDirty

public boolean isDirty(java.lang.Object obj)

Accessor for whether the passed object is dirty.

Specified by:

isDirty in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is dirty

isDeleted

public boolean isDeleted(java.lang.Object obj)

Accessor for whether the passed object is deleted.

Specified by:

isDeleted in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is deleted

isDetached

public boolean isDetached(java.lang.Object obj)

Accessor for whether the passed object is detached.

Specified by:

isDetached in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is detached

isTransactional

public boolean isTransactional(java.lang.Object obj)

Accessor for whether the passed object is transactional.

Specified by:

isTransactional in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is transactional

isPersistable

public boolean isPersistable(java.lang.Object obj)

Method to return if the passed object is persistable using this API. Returns whether the object is an instance of javax.jdo.spi.PersistenceCapable.

Specified by:

isPersistable in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is persistable

isPersistable

public boolean isPersistable(java.lang.Class cls)

Utility method to check if the specified class is of a type that can be persisted for this API. Checks that it implements javax.jdo.spi.PersistenceCapable.

Specified by:

isPersistable in interface ApiAdapter

Parameters:

cls - The class to check

Returns:

Whether the class is persistable

isDetachable

public boolean isDetachable(java.lang.Object obj)

Method to return if the passed object is detachable using this API. Returns whether the object is an instance of javax.jdo.spi.Detachable.

Specified by:

isDetachable in interface ApiAdapter

Parameters:

obj - The object

Returns:

Whether it is detachable

getObjectState

public java.lang.String getObjectState(java.lang.Object obj)

Accessor for the object state.

Specified by:

getObjectState in interface ApiAdapter

Parameters:

obj - Object

Returns:

The state ("persistent-clean", "detached-dirty" etc)

getIdForObject

public java.lang.Object getIdForObject(java.lang.Object obj)

Method to return the object identity for the passed persistable object. Returns null if it is not persistable, or has no identity.

Specified by:

getIdForObject in interface ApiAdapter

Parameters:

obj - The object

Returns:

The identity

getVersionForObject

public java.lang.Object getVersionForObject(java.lang.Object obj)

Method to return the object version for the passed persistable object. Returns null if it is not persistable, or not versioned.

Specified by:

getVersionForObject in interface ApiAdapter

Parameters:

obj - The object

Returns:

The version

isValidPrimaryKeyClass

public boolean isValidPrimaryKeyClass(java.lang.Class pkClass,
                                      AbstractClassMetaData cmd,
                                      ClassLoaderResolver clr,
                                      int noOfPkFields)

Utility to check if a primary-key class is valid. Will throw a InvalidPrimaryKeyException if it is invalid, otherwise returning true.

Specified by:

isValidPrimaryKeyClass in interface ApiAdapter

Parameters:

pkClass - The Primary Key class

cmd - AbstractClassMetaData for the PersistenceCapable class

clr - the ClassLoaderResolver

noOfPkFields - Number of primary key fields

Returns:

Whether it is valid

isSingleFieldIdentity

public boolean isSingleFieldIdentity(java.lang.Object id)

Accessor for whether the passed identity is a valid single-field application-identity for this API.

Specified by:

isSingleFieldIdentity in interface ApiAdapter

Returns:

Whether it is valid

isSingleFieldIdentityClass

public boolean isSingleFieldIdentityClass(java.lang.String className)

Checks whether the passed class name is valid for a single field application-identity for this API.

Specified by:

isSingleFieldIdentityClass in interface ApiAdapter

Parameters:

className - the full class name

Returns:

Whether it is a single field class

getSingleFieldIdentityClassNameForLong

public java.lang.String getSingleFieldIdentityClassNameForLong()

Accessor for the class name to use for identities when there is a single Long/long field.

Specified by:

getSingleFieldIdentityClassNameForLong in interface ApiAdapter

Returns:

Class name of identity class

getSingleFieldIdentityClassNameForInt

public java.lang.String getSingleFieldIdentityClassNameForInt()

Accessor for the class name to use for identities when there is a single Integer/int field.

Specified by:

getSingleFieldIdentityClassNameForInt in interface ApiAdapter

Returns:

Class name of identity class

getSingleFieldIdentityClassNameForShort

public java.lang.String getSingleFieldIdentityClassNameForShort()

Accessor for the class name to use for identities when there is a single Short/short field.

Specified by:

getSingleFieldIdentityClassNameForShort in interface ApiAdapter

Returns:

Class name of identity class

getSingleFieldIdentityClassNameForByte

public java.lang.String getSingleFieldIdentityClassNameForByte()

Accessor for the class name to use for identities when there is a single Byte/byte field.

Specified by:

getSingleFieldIdentityClassNameForByte in interface ApiAdapter

Returns:

Class name of identity class

getSingleFieldIdentityClassNameForChar

public java.lang.String getSingleFieldIdentityClassNameForChar()

Accessor for the class name to use for identities when there is a single Character/char field.

Specified by:

getSingleFieldIdentityClassNameForChar in interface ApiAdapter

Returns:

Class name of identity class

getSingleFieldIdentityClassNameForString

public java.lang.String getSingleFieldIdentityClassNameForString()

Accessor for the class name to use for identities when there is a single String field.

Specified by:

getSingleFieldIdentityClassNameForString in interface ApiAdapter

Returns:

Class name of identity class

getSingleFieldIdentityClassNameForObject

public java.lang.String getSingleFieldIdentityClassNameForObject()

Accessor for the class name to use for identities when there is a single Object field.

Specified by:

getSingleFieldIdentityClassNameForObject in interface ApiAdapter

Returns:

Class name of identity class

getTargetClassForSingleFieldIdentity

public java.lang.Class getTargetClassForSingleFieldIdentity(java.lang.Object id)

Accessor for the target class for the specified single field application-identity.

Specified by:

getTargetClassForSingleFieldIdentity in interface ApiAdapter

Parameters:

id - The identity

Returns:

The target class

getTargetClassNameForSingleFieldIdentity

public java.lang.String getTargetClassNameForSingleFieldIdentity(java.lang.Object id)

Accessor for the target class name for the specified single field identity.

Specified by:

getTargetClassNameForSingleFieldIdentity in interface ApiAdapter

Parameters:

id - The identity

Returns:

The target class name

getTargetKeyForSingleFieldIdentity

public java.lang.Object getTargetKeyForSingleFieldIdentity(java.lang.Object id)

Accessor for the key object for the specified single field application-identity.

Specified by:

getTargetKeyForSingleFieldIdentity in interface ApiAdapter

Parameters:

id - The identity

Returns:

The key object

getKeyTypeForSingleFieldIdentityType

public java.lang.Class getKeyTypeForSingleFieldIdentityType(java.lang.Class idType)

Accessor for the type of the single field application-identity key given the single field identity type.

Specified by:

getKeyTypeForSingleFieldIdentityType in interface ApiAdapter

Parameters:

idType - Single field identity type

Returns:

key type

getNewSingleFieldIdentity

public java.lang.Object getNewSingleFieldIdentity(java.lang.Class idType,
                                                  java.lang.Class pcType,
                                                  java.lang.Object value)

Utility to create a new SingleFieldIdentity using reflection when you know the type of the PersistenceCapable, and also which SingleFieldIdentity, and the value of the key.

Specified by:

getNewSingleFieldIdentity in interface ApiAdapter

Parameters:

idType - Type of SingleFieldIdentity

pcType - Type of the PersistenceCapable

value - The value for the identity (the Long, or Int, or ... etc).

Returns:

Single field identity

Throws:

NucleusException - if invalid input is received

getNewApplicationIdentityObjectId

public java.lang.Object getNewApplicationIdentityObjectId(ClassLoaderResolver clr,
                                                          AbstractClassMetaData acmd,
                                                          java.lang.String value)

Utility to create a new application identity when you know the metadata for the target class, and the toString() output of the identity.

Specified by:

getNewApplicationIdentityObjectId in interface ApiAdapter

Parameters:

clr - ClassLoader resolver

acmd - MetaData for the target class

value - String form of the key

Returns:

The identity

Throws:

NucleusException - if invalid input is received

getNewApplicationIdentityObjectId

public java.lang.Object getNewApplicationIdentityObjectId(java.lang.Object pc,
                                                          AbstractClassMetaData cmd)

Method to create a new object identity for the passed object with the supplied MetaData. Only applies to application-identity cases.

Specified by:

getNewApplicationIdentityObjectId in interface ApiAdapter

Parameters:

pc - The persistable object

cmd - Its metadata

Returns:

The new identity object

getNewApplicationIdentityObjectId

public java.lang.Object getNewApplicationIdentityObjectId(java.lang.Class cls,
                                                          java.lang.Object key)

Method to return a new object identity for the specified class, and key (possibly toString() output).

Specified by:

getNewApplicationIdentityObjectId in interface ApiAdapter

Parameters:

cls - Persistable class

key - form of the object id

Returns:

The object identity

allowPersistOfDeletedObject

public boolean allowPersistOfDeletedObject()

Whether the API allows (re-)persistence of a deleted object.

Specified by:

allowPersistOfDeletedObject in interface ApiAdapter

Returns:

Whether you can call persist on a deleted object

allowDeleteOfNonPersistentObject

public boolean allowDeleteOfNonPersistentObject()

Whether the API allows deletion of a non-persistent object.

Specified by:

allowDeleteOfNonPersistentObject in interface ApiAdapter

Returns:

Whether you can call delete on an object not yet persisted

allowReadFieldOfDeletedObject

public boolean allowReadFieldOfDeletedObject()

Whether the API allows reading a field of a deleted object.

Specified by:

allowReadFieldOfDeletedObject in interface ApiAdapter

Returns:

Whether you can read after deleting

clearLoadedFlagsOnDeleteObject

public boolean clearLoadedFlagsOnDeleteObject()

Whether the API requires clearing of the fields of an object when it is deleted.

Specified by:

clearLoadedFlagsOnDeleteObject in interface ApiAdapter

Returns:

Whether to clear loaded fields at delete

getDefaultCascadePersistForField

public boolean getDefaultCascadePersistForField()

Returns the default cascade-persist. JDO defaults to persisting by reachability.

Specified by:

getDefaultCascadePersistForField in interface ApiAdapter

Returns:

The default value for cascade-persist (true)

getDefaultCascadeUpdateForField

public boolean getDefaultCascadeUpdateForField()

Returns the default cascade-update setting. JDO defaults to updating by reachability.

Specified by:

getDefaultCascadeUpdateForField in interface ApiAdapter

Returns:

The default cascade-update (true)

getDefaultCascadeDeleteForField

public boolean getDefaultCascadeDeleteForField()

Returns the default cascade-delete setting. JDO defaults to not deleting by reachability (unless using delete dependent)

Specified by:

getDefaultCascadeDeleteForField in interface ApiAdapter

Returns:

The default cascade-delete (false)

getDefaultCascadeRefreshForField

public boolean getDefaultCascadeRefreshForField()

Returns the default cascade-refresh setting.

Specified by:

getDefaultCascadeRefreshForField in interface ApiAdapter

Returns:

The default cascade-refresh (false)

getDefaultFactoryProperties

public java.util.Map getDefaultFactoryProperties()

Method to return the default factory properties for this API.

Specified by:

getDefaultFactoryProperties in interface ApiAdapter

Returns:

The default props

getObjectId

public java.lang.Object getObjectId(StateManager sm)

Accessor for the object id from the StateManager for this object.

Specified by:

getObjectId in interface ApiAdapter

Parameters:

sm - StateManager

Returns:

object id

getVersion

public java.lang.Object getVersion(StateManager sm)

Accessor for the version from the StateManager for this object.

Specified by:

getVersion in interface ApiAdapter

Parameters:

sm - StateManager

isLoaded

public boolean isLoaded(StateManager sm,
                        int fieldNumber)

Accessor for whether a field is loaded for the object managed by the StateManager

Specified by:

isLoaded in interface ApiAdapter

Parameters:

sm - StateManager

fieldNumber - Number of the field

Returns:

Whether it is loaded

getPersistenceManager

public java.lang.Object getPersistenceManager(java.lang.Object obj)

Accessor for the persistence manager for this object. The returned object will be a JDO PersistenceManager or null if not managed.

Specified by:

getPersistenceManager in interface ApiAdapter

Parameters:

obj - The object

Returns:

The persistence manager

makeFieldDirty

public void makeFieldDirty(java.lang.Object obj,
                           java.lang.String fieldName)

Method to make the field dirty in the object.

Specified by:

makeFieldDirty in interface ApiAdapter

Parameters:

obj - Object

fieldName - Name of the field to make dirty

getExceptionForException

public java.lang.RuntimeException getExceptionForException(java.lang.String msg,
                                                           java.lang.Exception e)

Convenience method to return an exception to throw for this API when an unexpected exception occurs. This is considered a user exception.

Specified by:

getExceptionForException in interface ApiAdapter

Parameters:

msg - The message

e - The cause

Returns:

The JDO exception