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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o.ext

Source Cross Reference Class Diagram Java Document (Java Doc)

com.db4o.ext .ObjectCallbacks

ObjectCallbacks
public interface ObjectCallbacks (Code)
	callback methods. This interface only serves as a list of all available callback methods. Every method is called individually, independantly of implementing this interface. Using callbacks Simply implement one or more of the listed methods in your application classes to do tasks before activation, deactivation, delete, new or update, to cancel the action about to be performed and to respond to the performed task. Callback methods are typically used for: - cascaded delete - cascaded update - cascaded activation - restoring transient members on instantiation Callback methods follow regular calling conventions. Methods in superclasses need to be called explicitely. All method calls are implemented to occur only once, upon one event.

Method Summary
public boolean	objectCanActivate(ObjectContainer container) called before an Object is activated. Parameters: container - the `ObjectContainer` the object is stored in.
public boolean	objectCanDeactivate(ObjectContainer container) called before an Object is deactivated. Parameters: container - the `ObjectContainer` the object is stored in.
public boolean	objectCanDelete(ObjectContainer container) called before an Object is deleted. In a client/server setup this callback method will be executed on the server. Parameters: container - the `ObjectContainer` the object is stored in.
public boolean	objectCanNew(ObjectContainer container) called before an Object is stored the first time. Parameters: container - the `ObjectContainer` is about to be stored to.
public boolean	objectCanUpdate(ObjectContainer container) called before a persisted Object is updated. Parameters: container - the `ObjectContainer` the object is stored in.
public void	objectOnActivate(ObjectContainer container) called upon activation of an object.
public void	objectOnDeactivate(ObjectContainer container) called upon deactivation of an object.
public void	objectOnDelete(ObjectContainer container) called after an object was deleted.
public void	objectOnNew(ObjectContainer container) called after a new object was stored.
public void	objectOnUpdate(ObjectContainer container) called after an object was updated.

Method Detail

objectCanActivate
public boolean objectCanActivate(ObjectContainer container)(Code)
	called before an Object is activated. Parameters: container - the `ObjectContainer` the object is stored in. false to prevent activation.

objectCanDeactivate
public boolean objectCanDeactivate(ObjectContainer container)(Code)
	called before an Object is deactivated. Parameters: container - the `ObjectContainer` the object is stored in. false to prevent deactivation.

objectCanDelete
public boolean objectCanDelete(ObjectContainer container)(Code)
	called before an Object is deleted. In a client/server setup this callback method will be executed on the server. Parameters: container - the `ObjectContainer` the object is stored in. false to prevent the object from being deleted.

objectCanNew
public boolean objectCanNew(ObjectContainer container)(Code)
	called before an Object is stored the first time. Parameters: container - the `ObjectContainer` is about to be stored to. false to prevent the object from being stored.

objectCanUpdate
public boolean objectCanUpdate(ObjectContainer container)(Code)
	called before a persisted Object is updated. Parameters: container - the `ObjectContainer` the object is stored in. false to prevent the object from being updated.

objectOnActivate
public void objectOnActivate(ObjectContainer container)(Code)
	called upon activation of an object. Parameters: container - the `ObjectContainer` the object is stored in.

objectOnDeactivate
public void objectOnDeactivate(ObjectContainer container)(Code)
	called upon deactivation of an object. Parameters: container - the `ObjectContainer` the object is stored in.

objectOnDelete
public void objectOnDelete(ObjectContainer container)(Code)
	called after an object was deleted. In a client/server setup this callback method will be executed on the server. Parameters: container - the `ObjectContainer` the object was stored in.

objectOnNew
public void objectOnNew(ObjectContainer container)(Code)
	called after a new object was stored. Parameters: container - the `ObjectContainer` the object is stored to.

objectOnUpdate
public void objectOnUpdate(ObjectContainer container)(Code)
	called after an object was updated. Parameters: container - the `ObjectContainer` the object is stored in.

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