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## org.hibernate.event.def
Class DefaultDeleteEventListener

    java.lang.Object
      org.hibernate.event.def.DefaultDeleteEventListener

All Implemented Interfaces:
  Serializable, DeleteEventListener

    public class DefaultDeleteEventListener

extends Object
implements DeleteEventListener

Defines the default delete event listener used by hibernate for deleting entities from the datastore in response to generated delete events.

Author:
  Steve Ebersole
See Also:
  Serialized Form

Constructor Summary
`DefaultDeleteEventListener()`

Method Summary
`protected void` | `cascadeAfterDelete(EventSource session, EntityPersister persister, Object entity, Set transientEntities)`
`protected void` | `cascadeBeforeDelete(EventSource session, EntityPersister persister, Object entity, EntityEntry entityEntry, Set transientEntities)`
`protected void` | `deleteEntity(EventSource session, Object entity, EntityEntry entityEntry, boolean isCascadeDeleteEnabled, EntityPersister persister, Set transientEntities)` Perform the entity deletion.
`protected void` | `deleteTransientEntity(EventSource session, Object entity, boolean cascadeDeleteEnabled, EntityPersister persister, Set transientEntities)` We encountered a delete request on a transient instance.
`protected boolean` | `invokeDeleteLifecycle(EventSource session, Object entity, EntityPersister persister)`
`void` | `onDelete(DeleteEvent event)` Handle the given delete event.
`void` | `onDelete(DeleteEvent event, Set transientEntities)` Handle the given delete event.
`protected void` | `performDetachedEntityDeletionCheck(DeleteEvent event)` Called when we have recognized an attempt to delete a detached entity.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DefaultDeleteEventListener

    public DefaultDeleteEventListener()

Method Detail

### onDelete

    public void onDelete(DeleteEvent event)
                  throws HibernateException

  Handle the given delete event.

  Specified by:
    `onDelete` in interface `DeleteEventListener`
  Parameters:
    `event` - The delete event to be handled.
  Throws:
    `HibernateException`

### onDelete

    public void onDelete(DeleteEvent event,
                         Set transientEntities)
                  throws HibernateException

  Handle the given delete event. This is the cascaded form.

  Specified by:
    `onDelete` in interface `DeleteEventListener`
  Parameters:
    `event` - The delete event.
    `transientEntities` - The cache of entities already deleted
  Throws:
    `HibernateException`

### performDetachedEntityDeletionCheck

    protected void performDetachedEntityDeletionCheck(DeleteEvent event)

  Called when we have recognized an attempt to delete a detached entity.

  This is perfectly valid in Hibernate usage; JPA, however, forbids this. Thus, this is a hook for HEM to affect this behavior.

  Parameters:
    `event` - The event.

### deleteTransientEntity

    protected void deleteTransientEntity(EventSource session,
                                         Object entity,
                                         boolean cascadeDeleteEnabled,
                                         EntityPersister persister,
                                         Set transientEntities)

  We encountered a delete request on a transient instance.

  This is a deviation from historical Hibernate (pre-3.2) behavior to align with the JPA spec, which states that transient entities can be passed to remove operation in which case cascades still need to be performed.

  Parameters:
    `session` - The session which is the source of the event
    `entity` - The entity being delete processed
    `cascadeDeleteEnabled` - Is cascading of deletes enabled
    `persister` - The entity persister
    `transientEntities` - A cache of already visited transient entities (to avoid infinite recursion).

### deleteEntity

    protected final void deleteEntity(EventSource session,
                                      Object entity,
                                      EntityEntry entityEntry,
                                      boolean isCascadeDeleteEnabled,
                                      EntityPersister persister,
                                      Set transientEntities)

  Perform the entity deletion. Well, as with most operations, does not really perform it; just schedules an action/execution with the `ActionQueue` for execution during flush.

  Parameters:
    `session` - The originating session
    `entity` - The entity to delete
    `entityEntry` - The entity's entry in the `PersistenceContext`
    `isCascadeDeleteEnabled` - Is delete cascading enabled?
    `persister` - The entity persister.
    `transientEntities` - A cache of already deleted entities.

### invokeDeleteLifecycle

    protected boolean invokeDeleteLifecycle(EventSource session,
                                            Object entity,
                                            EntityPersister persister)

### cascadeBeforeDelete

    protected void cascadeBeforeDelete(EventSource session,
                                       EntityPersister persister,
                                       Object entity,
                                       EntityEntry entityEntry,
                                       Set transientEntities)
                                throws HibernateException

  Throws:
    `HibernateException`

### cascadeAfterDelete

    protected void cascadeAfterDelete(EventSource session,
                                      EntityPersister persister,
                                      Object entity,
                                      Set transientEntities)
                               throws HibernateException

  Throws:
    `HibernateException`

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