org.appfuse.dao.jpa
Class UniversalDaoJpa

java.lang.Object
  org.appfuse.dao.jpa.UniversalDaoJpa

All Implemented Interfaces:

UniversalDao

Direct Known Subclasses:

LookupDaoJpa

public class UniversalDaoJpa
extends java.lang.Object
implements UniversalDao

This class serves as the a class that can CRUD any object witout any Spring configuration. The only downside is it does require casting from Object to the object class.

Author:

Bryan Noll

Field Summary

protected javax.persistence.EntityManager	entityManager Entity manager, injected by Spring using @PersistenceContext annotation on setEntityManager()
protected org.apache.commons.logging.Log	log Log variable for all child classes.

Constructor Summary

UniversalDaoJpa()

Method Summary

java.lang.Object	get(java.lang.Class clazz, java.io.Serializable id) Generic method to get an object based on class and identifier.
java.util.List	getAll(java.lang.Class clazz) Generic method used to get all objects of a particular type.
void	remove(java.lang.Class clazz, java.io.Serializable id) Generic method to delete an object based on class and id
java.lang.Object	save(java.lang.Object o) Generic method to save an object - handles both update and insert.
void	setEntityManager(javax.persistence.EntityManager entityManager)

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final org.apache.commons.logging.Log log

Log variable for all child classes. Uses LogFactory.getLog(getClass()) from Commons Logging

entityManager

protected javax.persistence.EntityManager entityManager

Entity manager, injected by Spring using @PersistenceContext annotation on setEntityManager()

Constructor Detail

UniversalDaoJpa

public UniversalDaoJpa()

Method Detail

setEntityManager

public void setEntityManager(javax.persistence.EntityManager entityManager)

save

public java.lang.Object save(java.lang.Object o)

Generic method to save an object - handles both update and insert.

Specified by:

save in interface UniversalDao

Parameters:

o - the object to save

Returns:

a populated object

get

public java.lang.Object get(java.lang.Class clazz,
                            java.io.Serializable id)

Generic method to get an object based on class and identifier. An ObjectRetrievalFailureException Runtime Exception is thrown if nothing is found.

Specified by:

get in interface UniversalDao

Parameters:

clazz - model class to lookup

id - the identifier (primary key) of the class

Returns:

a populated object

See Also:

org.springframework.orm.ObjectRetrievalFailureException

getAll

public java.util.List getAll(java.lang.Class clazz)

Generic method used to get all objects of a particular type. This is the same as lookup up all rows in a table.

Specified by:

getAll in interface UniversalDao

Parameters:

clazz - the type of objects (a.k.a. while table) to get data from

Returns:

List of populated objects

remove

public void remove(java.lang.Class clazz,
                   java.io.Serializable id)

Generic method to delete an object based on class and id

Specified by:

remove in interface UniversalDao

Parameters:

clazz - model class to lookup

id - the identifier (primary key) of the class