gallery.beans

Class AbstractBean<T>

java.lang.Object

gallery.beans.AbstractBean<T>

Type Parameters:

T - The Entity to work on

Direct Known Subclasses:

CommentBean, GalleryBean, GalleryPhotographBean, LocationBean, LogBean, PhotographBean, TagBean

public abstract class AbstractBean<T>
extends java.lang.Object

Abstract class that provides default implementations for retrieving entities.

Constructor Summary

Constructors

Constructor and Description
AbstractBean(java.lang.Class<T> entityClass) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
int	count() Returns the number of entities available.
void	create(T entity) Persist an entity to the database.
void	edit(T entity) Updates an entity.
T	find(java.lang.Long id) Retrieves an identity.
java.util.List<T>	findAll() Retrieve all instances of the entity.
java.util.List<T>	findRange(int[] range) TODO: an array? Seems weird.
protected abstract javax.persistence.EntityManager	getEntityManager() Returns the Entity manager.
void	remove(T entity) Deletes an entity.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractBean

public AbstractBean(java.lang.Class<T> entityClass)

Constructor

Parameters:

entityClass - the class of the entity on which this class is to perform its operations.

Method Detail

getEntityManager

protected abstract javax.persistence.EntityManager getEntityManager()

Returns the Entity manager.

Returns:

EntityManager

create

public void create(T entity)

Persist an entity to the database.

Parameters:

entity -

edit

public void edit(T entity)

Updates an entity.

Parameters:

entity -

remove

public void remove(T entity)

Deletes an entity.

Parameters:

entity -

find

public T find(java.lang.Long id)

Retrieves an identity.

Parameters:

id - the primary key/unique identifier of the entity

Returns:

the entity found, or null if not found.

findAll

public java.util.List<T> findAll()

Retrieve all instances of the entity.

Returns:

List of entities

findRange

public java.util.List<T> findRange(int[] range)

TODO: an array? Seems weird. Retrieve a range of entities, for paging possibilities.

Parameters:

range - integer array, containing row numbers, size of two, first is the first row and last is the last row (exclusive).

Returns:

List of entities

count

public int count()

Returns the number of entities available.

Returns:

integer indicating how many entities there are.