de.alpharogroup.db.entity.delete

Class Deletion<PK extends Serializable,T,U>

java.lang.Object

de.alpharogroup.db.entity.BaseEntity<PK>

de.alpharogroup.db.entity.delete.Deletion<PK,T,U>

Type Parameters:

PK - the generic type of the id

T - the generic type of time measurement

U - the generic type of the user or account

All Implemented Interfaces:

de.alpharogroup.db.entity.delete.Deletable<T,U>, de.alpharogroup.db.entity.delete.IdentifiableDeletable<PK,T,U>, de.alpharogroup.db.entity.Identifiable<PK>, Serializable

@Entity
public class Deletion<PK extends Serializable,T,U>
extends BaseEntity<PK>
implements de.alpharogroup.db.entity.delete.IdentifiableDeletable<PK,T,U>

The entity class Deletion acts like an deletion flag that keeps the information for the deletion of another entity that have this entity as an instance variable. This information are the date when it was deleted and from whom it was deleted. So this entity can be attached to another entity for keeping information if it is deleted and when it was deleted.

In specific situation entities have to be kept for instance of historical purposes. So the intent of this entity is that a parent entity will not really be deleted. The initial value of the parent entity that keeps this entity as an instance variable as a null object that signals that it is not deleted, and when it get a value with the deletion data it signals that it is now deleted and is not visible to selections.

Note: So this entity will only be created if the parent entity references to this entity and is intended to be deleted. This can be done for instance in a deletion strategy. Note: There is no need of a delete flag in this entity because this entity is the flag. So if the parent entity is not any more 'deleted' the reference of this entity will be set to null back.

See Also:

Serialized Form

Field Summary

Fields inherited from class de.alpharogroup.db.entity.BaseEntity

FOREIGN_KEY_PREFIX, INDEX_PREFIX, SEQUENCE_GENERATOR_PREFIX, SEQUENCE_PREFIX, UNDERSCORE, UNIQUE_CONSTRAINT_PREFIX

Constructor Summary

Constructors

Constructor and Description
Deletion()

Method Summary

Methods inherited from class de.alpharogroup.db.entity.BaseEntity

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.alpharogroup.db.entity.Identifiable

getId, setId

Methods inherited from interface de.alpharogroup.db.entity.delete.Deletable

getDeleted, getDeletedBy, setDeleted, setDeletedBy

Constructor Detail

Deletion

public Deletion()