org.hibernate

Class EmptyInterceptor

java.lang.Object

org.hibernate.EmptyInterceptor

All Implemented Interfaces:

Serializable, Interceptor

public class EmptyInterceptor
extends Object
implements Interceptor, Serializable

An interceptor that does nothing. May be used as a base class for application-defined custom interceptors.

Author:

Gavin King

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Interceptor	INSTANCE The singleton reference.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EmptyInterceptor()

Method Summary

Modifier and Type	Method and Description
void	afterTransactionBegin(Transaction tx) Called when a Hibernate transaction is begun via the Hibernate Transaction API.
void	afterTransactionCompletion(Transaction tx) Called after a transaction is committed or rolled back.
void	beforeTransactionCompletion(Transaction tx) Called before a transaction is committed (but not before rollback).
int[]	findDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types) Called from flush().
Object	getEntity(String entityName, Serializable id) Get a fully loaded entity instance that is cached externally.
String	getEntityName(Object object) Get the entity name for a persistent or transient instance.
Object	instantiate(String entityName, EntityMode entityMode, Serializable id) Instantiate the entity class.
Boolean	isTransient(Object entity) Called to distinguish between transient and detached entities.
void	onCollectionRecreate(Object collection, Serializable key) Called before a collection is (re)created.
void	onCollectionRemove(Object collection, Serializable key) Called before a collection is deleted.
void	onCollectionUpdate(Object collection, Serializable key) Called before a collection is updated.
void	onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) Called before an object is deleted.
boolean	onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types) Called when an object is detected to be dirty, during a flush.
boolean	onLoad(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) Called just before an object is initialized.
String	onPrepareStatement(String sql) Called when sql string is being prepared.
boolean	onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) Called before an object is saved.
void	postFlush(Iterator entities) Called after a flush that actually ends in execution of the SQL statements required to synchronize in-memory state with the database.
void	preFlush(Iterator entities) Called before a flush.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final Interceptor INSTANCE

The singleton reference.

Constructor Detail

EmptyInterceptor

protected EmptyInterceptor()

Method Detail

onDelete

public void onDelete(Object entity,
                     Serializable id,
                     Object[] state,
                     String[] propertyNames,
                     Type[] types)

Description copied from interface: Interceptor

Called before an object is deleted. It is not recommended that the interceptor modify the state.

Specified by:

onDelete in interface Interceptor

Parameters:

entity - The entity instance being deleted

id - The identifier of the entity

state - The state of the entity

propertyNames - The names of the entity properties.

types - The types of the entity properties

onFlushDirty

public boolean onFlushDirty(Object entity,
                            Serializable id,
                            Object[] currentState,
                            Object[] previousState,
                            String[] propertyNames,
                            Type[] types)

Description copied from interface: Interceptor

Called when an object is detected to be dirty, during a flush. The interceptor may modify the detected currentState, which will be propagated to both the database and the persistent object. Note that not all flushes end in actual synchronization with the database, in which case the new currentState will be propagated to the object, but not necessarily (immediately) to the database. It is strongly recommended that the interceptor not modify the previousState.

NOTE: The indexes across the currentState, previousState, propertyNames and types arrays match.

Specified by:

onFlushDirty in interface Interceptor

Parameters:

entity - The entity instance detected as being dirty and being flushed

id - The identifier of the entity

currentState - The entity's current state

previousState - The entity's previous (load time) state.

propertyNames - The names of the entity properties

types - The types of the entity properties

Returns:

true if the user modified the currentState in any way.

onLoad

public boolean onLoad(Object entity,
                      Serializable id,
                      Object[] state,
                      String[] propertyNames,
                      Type[] types)

Description copied from interface: Interceptor

Called just before an object is initialized. The interceptor may change the state, which will be propagated to the persistent object. Note that when this method is called, entity will be an empty uninitialized instance of the class.

NOTE: The indexes across the state, propertyNames and types arrays match.

Specified by:

onLoad in interface Interceptor

Parameters:

entity - The entity instance being loaded

id - The identifier value being loaded

state - The entity state (which will be pushed into the entity instance)

propertyNames - The names of the entity properties, corresponding to the state.

types - The types of the entity properties, corresponding to the state.

Returns:

true if the user modified the state in any way.

onSave

public boolean onSave(Object entity,
                      Serializable id,
                      Object[] state,
                      String[] propertyNames,
                      Type[] types)

Description copied from interface: Interceptor

Called before an object is saved. The interceptor may modify the state, which will be used for the SQL INSERT and propagated to the persistent object.

Specified by:

onSave in interface Interceptor

Parameters:

entity - The entity instance whose state is being inserted

id - The identifier of the entity

state - The state of the entity which will be inserted

propertyNames - The names of the entity properties.

types - The types of the entity properties

Returns:

true if the user modified the state in any way.

postFlush

public void postFlush(Iterator entities)

Description copied from interface: Interceptor

Called after a flush that actually ends in execution of the SQL statements required to synchronize in-memory state with the database.

Specified by:

postFlush in interface Interceptor

Parameters:

entities - The entities that were flushed.

preFlush

public void preFlush(Iterator entities)

Description copied from interface: Interceptor

Called before a flush.

Specified by:

preFlush in interface Interceptor

Parameters:

entities - The entities to be flushed.

isTransient

public Boolean isTransient(Object entity)

Description copied from interface: Interceptor

Called to distinguish between transient and detached entities. The return value determines the state of the entity with respect to the current session.

• Boolean.TRUE - the entity is transient
• Boolean.FALSE - the entity is detached
• null - Hibernate uses the unsaved-value mapping and other heuristics to determine if the object is unsaved

Specified by:

isTransient in interface Interceptor

Parameters:

entity - a transient or detached entity

Returns:

Boolean or null to choose default behaviour

instantiate

public Object instantiate(String entityName,
                          EntityMode entityMode,
                          Serializable id)

Description copied from interface: Interceptor

Instantiate the entity class. Return null to indicate that Hibernate should use the default constructor of the class. The identifier property of the returned instance should be initialized with the given identifier.

Specified by:

instantiate in interface Interceptor

Parameters:

entityName - the name of the entity

entityMode - The type of entity instance to be returned.

id - the identifier of the new instance

Returns:

an instance of the class, or null to choose default behaviour

findDirty

public int[] findDirty(Object entity,
                       Serializable id,
                       Object[] currentState,
                       Object[] previousState,
                       String[] propertyNames,
                       Type[] types)

Description copied from interface: Interceptor

Called from flush(). The return value determines whether the entity is updated

• an array of property indices - the entity is dirty
• an empty array - the entity is not dirty
• null - use Hibernate's default dirty-checking algorithm

Specified by:

findDirty in interface Interceptor

Parameters:

entity - The entity for which to find dirty properties.

id - The identifier of the entity

currentState - The current entity state as taken from the entity instance

previousState - The state of the entity when it was last synchronized (generally when it was loaded)

propertyNames - The names of the entity properties.

types - The types of the entity properties

Returns:

array of dirty property indices or null to indicate Hibernate should perform default behaviour

getEntityName

public String getEntityName(Object object)

Description copied from interface: Interceptor

Get the entity name for a persistent or transient instance.

Specified by:

getEntityName in interface Interceptor

Parameters:

object - an entity instance

Returns:

the name of the entity

getEntity

public Object getEntity(String entityName,
                        Serializable id)

Description copied from interface: Interceptor

Get a fully loaded entity instance that is cached externally.

Specified by:

getEntity in interface Interceptor

Parameters:

entityName - the name of the entity

id - the instance identifier

Returns:

a fully initialized entity

afterTransactionBegin

public void afterTransactionBegin(Transaction tx)

Description copied from interface: Interceptor

Called when a Hibernate transaction is begun via the Hibernate Transaction API. Will not be called if transactions are being controlled via some other mechanism (CMT, for example).

Specified by:

afterTransactionBegin in interface Interceptor

Parameters:

tx - The Hibernate transaction facade object

afterTransactionCompletion

public void afterTransactionCompletion(Transaction tx)

Description copied from interface: Interceptor

Called after a transaction is committed or rolled back.

Specified by:

afterTransactionCompletion in interface Interceptor

Parameters:

tx - The Hibernate transaction facade object

beforeTransactionCompletion

public void beforeTransactionCompletion(Transaction tx)

Description copied from interface: Interceptor

Called before a transaction is committed (but not before rollback).

Specified by:

beforeTransactionCompletion in interface Interceptor

Parameters:

tx - The Hibernate transaction facade object

onPrepareStatement

public String onPrepareStatement(String sql)

Description copied from interface: Interceptor

Called when sql string is being prepared.

Specified by:

onPrepareStatement in interface Interceptor

Parameters:

sql - sql to be prepared

Returns:

original or modified sql

onCollectionRemove

public void onCollectionRemove(Object collection,
                               Serializable key)
                        throws CallbackException

Description copied from interface: Interceptor

Called before a collection is deleted.

Specified by:

onCollectionRemove in interface Interceptor

Parameters:

collection - The collection instance.

key - The collection key value.

Throws:

CallbackException - Thrown if the interceptor encounters any problems handling the callback.

onCollectionRecreate

public void onCollectionRecreate(Object collection,
                                 Serializable key)
                          throws CallbackException

Description copied from interface: Interceptor

Called before a collection is (re)created.

Specified by:

onCollectionRecreate in interface Interceptor

Parameters:

collection - The collection instance.

key - The collection key value.

Throws:

CallbackException - Thrown if the interceptor encounters any problems handling the callback.

onCollectionUpdate

public void onCollectionUpdate(Object collection,
                               Serializable key)
                        throws CallbackException

Description copied from interface: Interceptor

Called before a collection is updated.

Specified by:

onCollectionUpdate in interface Interceptor

Parameters:

collection - The collection instance.

key - The collection key value.

Throws:

CallbackException - Thrown if the interceptor encounters any problems handling the callback.