TidePersistenceFactory.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 *   General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
package org.granite.tide.seam.lazy;

import javax.persistence.EntityManager;

import org.granite.tide.TidePersistenceManager;
import org.jboss.seam.Component;
import org.jboss.seam.Component.BijectedAttribute;
import org.jboss.seam.annotations.In;
import org.jboss.seam.framework.PersistenceController;


/**
 * Factory for creating the correct ITidePersistenceManager based on the 
 * persistence strategy passed in. Supported types are 
 * EntityManager,Session, EntityQuery, EntityHome, HibernateEntityHome and a
 * injected(@In) EntityManager or HibernateSession
 * @author CIngram
 */
public class TidePersistenceFactory {

	
	/**
	 * Create the ITidePersistenceManager. Supported types are 
     * EntityManager,Session, EntityQuery, EntityHome, HibernateEntityHome and a
     * injected(@In) EntityManager or HibernateSession
	 * 
	 * @param component
	 * @param persistenceType
	 * @return a ITidePersistenceManager.
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static TidePersistenceManager createTidePersistence(Component component, Object persistenceType) {
		if (persistenceType instanceof EntityManager){
			return createTidePersistence(component, (EntityManager)persistenceType);
		} else if (persistenceType instanceof PersistenceController) {
			return createTidePersistence(component, (PersistenceController)persistenceType);
        } else if (persistenceType instanceof BijectedAttribute) {
			return createTidePersistence(component, ((BijectedAttribute<In>)persistenceType));
		}
		
		return null;
	}
	
	
	/**
	 * Create a ITideInterceptor for a EntityManager.
	 * 
	 * @param component
	 * @param persistenceType
	 * @return a ITidePersistenceManager.
	 */
	public static TidePersistenceManager createTidePersistence(Component component, EntityManager persistenceType) {
	    return new PersistenceContextManager(persistenceType);
	}
    
    /**
     * Create  ITidePersistenceManager for a PersistenceController
	 * 
	 * @param component
     * @param controller
     * @return a ITidePersistenceManager.
     */
    public static TidePersistenceManager createTidePersistence(Component component, PersistenceController<?> controller) {
        String controllerName = component.getName();
        if (controller.getPersistenceContext() instanceof EntityManager)
            return new PersistenceControllerManager(controllerName);
        return null;
    } 
	
	/**
	 * Create a ITidePersistenceManager for a injected attribute(@In). 
	 * Supported Types are EntityManager or Session.
	 * 
	 * @param component
	 * @param att
	 * @return a ITidePersistenceManager.
	 */
	public static TidePersistenceManager createTidePersistence(Component component, BijectedAttribute<In> att) {
		if (att.getType() == EntityManager.class) {
			return new SeamEntityManager(att.getName());
		}
		return null;
	}
}