Package de.xima.fc.workflow.designer.listener

Class EntityReferenceDaoListener<TReferenced extends de.xima.cmn.dao.interfaces.IEntity<Long>,TReferencing extends de.xima.cmn.dao.interfaces.IEntity<Long>>

java.lang.Object

de.xima.fc.workflow.designer.listener.PreCommitDaoListener<TReferenced>

de.xima.fc.workflow.designer.listener.EntityReferenceDaoListener<TReferenced,TReferencing>

Type Parameters:

TReferenced - Type of the entity being referenced by another entity.

TReferencing - Type of the entity referencing another entity.

All Implemented Interfaces:

de.xima.cmn.dao.interfaces.IDaoActionListener<TReferenced,IEntityContext>

public abstract class EntityReferenceDaoListener<TReferenced extends de.xima.cmn.dao.interfaces.IEntity<Long>,TReferencing extends de.xima.cmn.dao.interfaces.IEntity<Long>>
extends PreCommitDaoListener<TReferenced>

A IDaoActionListener for checking whether an entity is still referenced by another entity, and preventing the deletion of said entity if it is.

This class delays the check just before the transaction is committed. This allows several entities to be deleted in one transaction. Otherwise, the check could find referencing entities that are scheduled to be deleted later during the transaction.

Since:

7.0.0

Author:

XIMA MEDIA GmbH

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EntityReferenceDaoListener(Class<TReferencing> referencedEntityClass)

Method Summary

Modifier and Type	Method	Description
protected boolean	checkPrecondition(TReferenced entity, IEntityContext ec)	If the createEntityRefsFilter(IEntity, IEntityContext) is complex, you can use this method to check whether the query for referencing entities should be performed.
protected abstract de.xima.cmn.criteria.FilterCriterion	createEntityRefsFilter(TReferenced entity, IEntityContext ec)
protected void	handleBeforeCommit(TReferenced entity, IEntityContext ec)

Methods inherited from class de.xima.fc.workflow.designer.listener.PreCommitDaoListener

handleNotification

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.xima.cmn.dao.interfaces.IDaoActionListener

handleNotification

Constructor Detail

EntityReferenceDaoListener

protected EntityReferenceDaoListener(Class<TReferencing> referencedEntityClass)

Method Detail

handleBeforeCommit

protected void handleBeforeCommit(TReferenced entity,
                                  IEntityContext ec)

Specified by:

handleBeforeCommit in class PreCommitDaoListener<TReferenced extends de.xima.cmn.dao.interfaces.IEntity<Long>>

checkPrecondition

protected boolean checkPrecondition(TReferenced entity,
                                    IEntityContext ec)

If the createEntityRefsFilter(IEntity, IEntityContext) is complex, you can use this method to check whether the query for referencing entities should be performed.

Parameters:

entity - The entity that is scheduled to be deleted.

ec - The current entity context.

Returns:

When false, the check for referencing entities is skipped and the deletion of the entity is allowed.

createEntityRefsFilter

protected abstract de.xima.cmn.criteria.FilterCriterion createEntityRefsFilter(TReferenced entity,
                                                                               IEntityContext ec)