[jboss-user] [JBoss Seam] - HibernateEntityConverter

[patrickr]

The EntityConverter doesn't seem to work with Hibernate managed sessions, does it? Because I didn?t find a HibernateEntityConverter either, I quickly wrote one myself. Maybe someone finds this useful. Feel free to add it to the source repository.


  | /**
  |  * This implementation of the EntityConverter is suitable for any Hibernate
  |  * Entity which uses annotations
  |  * 
  |  * @author Patrick Ruhkopf
  |  */
  | @Name("org.jboss.seam.ui.hibernateEntityConverter")
  | @Scope(ScopeType.CONVERSATION)
  | @Install(precedence = BUILT_IN)
  | @Converter
  | @Intercept(NEVER)
  | public class HibernateEntityConverter extends EntityConverter 
  | {
  | 	private ValueBinding<Session> session;
  | 	   
  | 	private Log log = Logging.getLog(HibernateEntityConverter.class);
  | 
  | 	public void setSession(ValueBinding<Session> session) {
  | 		this.session = session;
  | 	}
  | 
  | 	private Session getSession() 
  | 	{
  | 		if (session==null) {
  | 			return (Session) Component.getInstance( "database" );
  | 		}
  | 		else {
  | 	     return session.getValue();
  | 		}
  | 	}
  | 
  | 	@Override
  | 	protected Object loadEntityFromPersistenceContext(Class clazz, Object id) 
  | 	{
  | 		if (id == null || clazz == null) {
  | 			return null;
  | 		}
  | 		
  | 		if (id instanceof Serializable) 
  | 		{
  | 			Serializable sid = (Serializable) id;
  | 			Object entity = null;
  | 			if (getSession() == null)
  | 			{
  | 				sessionNotFoundMessage();
  | 			}
  | 			entity = getSession().get(clazz, sid);
  | 			if (entity == null)
  | 			{
  | 				invalidSelectionMessage(clazz, id);
  | 				return null;
  | 			}
  | 			else
  | 			{
  | 				return entity;
  | 			}
  | 		} else {
  | 			log.error("Converter only supports serializable ids");
  | 			throw new ConverterException(FacesMessages.createFacesMessage(SEVERITY_ERROR,
  |  getErrorMessageKey(), getErrorMessage()));
  | 		}
  | 	}
  | 
  | 	protected void sessionNotFoundMessage()
  | 	{
  | 		log.error("Hibernate session not found");
  | 		throw new ConverterException(FacesMessages.createFacesMessage(SEVERITY_ERROR, 
  | getErrorMessageKey(), getErrorMessage()));
  | 	}
  | }
  | 

Taglib


  | <tag>
  |   <tag-name>convertHibernateEntity</tag-name>	
  |  <converter>	 
  | <converter-id>org.jboss.seam.ui.hibernateEntityConverter</converter-id>
  | 		</converter>
  | 	</tag>
  | 

Example of components.xml if your managed Hibernate session has a different name than database

  | <core:managed-hibernate-session name="myVeryDatabase"
  |                                     auto-create="true"/>
  |                                     
  |     <component name="org.jboss.seam.ui.hibernateEntityConverter">
  |       <property name="session">#{myVeryDatabase}</property>
  |   	</component>
  | 

Regards
Patrick

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