org.josef.ejb

Class AbstractCrudChildControllerBean<T extends Persistable>

java.lang.Object

org.josef.ejb.AbstractCrudChildControllerBean<T>

Type Parameters:

T - The Persistable to maintain.

@Status(stage=DEVELOPMENT,
        unitTests=ABSENT)
public abstract class AbstractCrudChildControllerBean<T extends Persistable>
extends Object

Controller that support CRUD (Create, Read, Update Delete) actions on a JPA Entity that is a Child of another JPA Entity.

Version:

1.0 $Revision: 5460 $

Author:

Kees Schotanus

Constructor Summary

Constructors

Constructor and Description
AbstractCrudChildControllerBean()

Method Summary

Modifier and Type	Method and Description
T	findById(Long id) Finds an Entity with the supplied id.
javax.persistence.EntityManager	getEntityManager() Gets the Entity Manager.
abstract Class<T>	getItemType() Gets the type of the Entity to maintain.
T	merge(T entity) Merges the supplied entity.
void	persist(T entity, Long parentId) Persists the supplied entity.
abstract void	prePersist(T childEntity, Long parentId) Fetches the Entity with the supplied parentId and sets it on the supplied childEntity.
void	remove(T entity) Removes the Entity with the supplied id.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractCrudChildControllerBean

public AbstractCrudChildControllerBean()

Method Detail

getItemType

public abstract Class<T> getItemType()

Gets the type of the Entity to maintain.

Returns:

The type of the Entity maintain.

getEntityManager

public javax.persistence.EntityManager getEntityManager()

Gets the Entity Manager.

Returns:

The Entity Manager.

persist

public void persist(T entity,
                    Long parentId)

Persists the supplied entity.

Parameters:

entity - The Entity to persist.

parentId - Object ID of the parent Entity.

Throws:

NullPointerException - When the supplied entity is null.

javax.persistence.PersistenceException - When the persist operation failed.

prePersist

public abstract void prePersist(T childEntity,
                                Long parentId)

Fetches the Entity with the supplied parentId and sets it on the supplied childEntity.

Parameters:

childEntity - The child Entity.

parentId - The Object ID of the parent to which the supplied childEntity belongs.

merge

public T merge(T entity)

Merges the supplied entity.

Parameters:

entity - The Entity to merge.

Returns:

A copy of the merged state of the supplied entity.

Throws:

NullPointerException - When the supplied entity is null.

javax.persistence.PersistenceException - when the merge operation failed.

remove

public void remove(T entity)

Removes the Entity with the supplied id.

Parameters:

entity - The Entity to remove.

Throws:

NullPointerException - When the supplied entity is null.

javax.persistence.PersistenceException - when the remove operation failed.

findById

public T findById(Long id)

Finds an Entity with the supplied id.

Parameters:

id - The ID of the Entity to find.

Returns:

The Entity with the supplied id or null when no Entity with the supplied id exists.

Throws:

NullPointerException - When the supplied id is null.