raimund@438: /* Copyright (C) 2013 by Bundesamt fuer Strahlenschutz
raimund@438:  * Software engineering by Intevation GmbH
raimund@438:  *
raimund@438:  * This file is Free Software under the GNU GPL (v>=3)
raimund@438:  * and comes with ABSOLUTELY NO WARRANTY! Check out
raimund@438:  * the documentation coming with IMIS-Labordaten-Application for details.
raimund@438:  */
raimund@438: package de.intevation.lada.util.data;
raimund@438: 
raimund@438: import javax.annotation.Resource;
raimund@438: import javax.ejb.LocalBean;
raimund@438: import javax.ejb.SessionContext;
raimund@438: import javax.ejb.Stateless;
raimund@438: import javax.persistence.EntityManager;
raimund@438: import javax.validation.UnexpectedTypeException;
raimund@438: 
raimund@711: /**
raimund@711:  * Factory class used to get entitymanager for a specific persistence unit.
raimund@711:  *
raimund@711:  * @author <a href="mailto:rrenkert@intevation.de">Raimund Renkert</a>
raimund@711:  */
raimund@438: @Stateless
raimund@438: @LocalBean
raimund@438: public class EntityManagerProducer {
raimund@438: 
raimund@438:     @Resource
raimund@438:     private SessionContext ctx;
raimund@438: 
raimund@438:     private String jndiPath = "java:app/entitymanager/";
raimund@438: 
raimund@438:     /**
raimund@438:      * Constructor for multi-tenancy entity manager delegate.
raimund@438:      * Default jndi search path is 'java:app/entitymanager'.
raimund@438:      */
raimund@438:     public EntityManagerProducer() {
raimund@438:     }
raimund@438: 
raimund@438:     /**
raimund@438:      * Constructor for multi-tenancy entity manager delegate.
raimund@438:      *
raimund@438:      * @param jndiEnv The jndi path to search for datasources.
raimund@438:      *     Defaults to 'java:app/entitymanager'.
raimund@438:      */
raimund@438:     public EntityManagerProducer(String jndiPath) {
raimund@438:         this.jndiPath = jndiPath;
raimund@438:     }
raimund@438: 
raimund@438:     /**
raimund@438:      * Create an entity manager for a datasource.
raimund@438:      *
raimund@438:      * @throws UnexpectedTypeException
raimund@438:      * @param dataSourceName The jndi name of the datasource.
raimund@438:      * @return The entity manager for the datasource.
raimund@438:      */
raimund@438:     public EntityManager entityManager(String dataSourceName) {
raimund@438: 
raimund@438:         EntityManager entityManager = 
raimund@438:             (EntityManager) this.ctx.lookup(this.jndiPath + dataSourceName);
raimund@438: 
raimund@438:         if (entityManager == null) {
raimund@438:             throw new UnexpectedTypeException("Unknown data source name '" +
raimund@438:                 dataSourceName + "'.");
raimund@438:         }
raimund@438: 
raimund@438:         return entityManager;
raimund@438: 
raimund@438:     }
raimund@438: }