CNeryEntityHome.java

/**
 *  C-Nery - A home automation web application for C-Bus.
 *  Copyright (C) 2008,2009,2012  Dave Oxley <dave@daveoxley.co.uk>.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.daveoxley.seam;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import org.jboss.seam.annotations.In;
import org.jboss.seam.framework.EntityHome;
import org.jboss.seam.international.StatusMessages;

/**
 *
 * @author Dave Oxley <dave@daveoxley.co.uk>
 */
public abstract class CNeryEntityHome<E> extends EntityHome<E> {
    
    @In
    private StatusMessages statusMessages;

    protected abstract void clearFactoryInstance();

    @Override
    protected E loadInstance() 
    {
        E e = super.loadInstance();
        getEntityManager().refresh(e);
        return e;
    }

    @Override
    public String update() {
        try {
            return super.update();
        }
        catch (ConstraintViolationException cve) {
            statusMessages.clear();

            for (ConstraintViolation<?> cv : cve.getConstraintViolations()) {
                statusMessages.add((ConstraintViolation<Object>)cv);
            }
            clearFactoryInstance();
        }
        catch (PersistenceException pe) {
            Throwable t = pe.getCause();
            if (t == null)
                t = pe;
            statusMessages.clear();
            statusMessages.add(t.getLocalizedMessage());

            clearFactoryInstance();
        }
        return null;
    }

    @Override
    public String persist() {
        try {
            return super.persist();
        }
        catch (ConstraintViolationException cve) {
            statusMessages.clear();

            for (ConstraintViolation<?> cv : cve.getConstraintViolations()) {
                statusMessages.add((ConstraintViolation<Object>)cv);
            }
            clearFactoryInstance();
        }
        catch (PersistenceException pe) {
            Throwable t = pe.getCause();
            if (t == null)
                t = pe;
            statusMessages.clear();
            statusMessages.add(t.getLocalizedMessage());

            clearFactoryInstance();
        }
        return null;
    }
}