org.quackbot.dao.hibernate.GenericHbDAO.java Source code

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Here is the source code for org.quackbot.dao.hibernate.GenericHbDAO.java

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/**
 * Copyright (C) 2011 Leon Blakey <lord.quackstar at gmail.com>
 *
 * This file is part of Quackbot.
 *
 * Quackbot is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Quackbot 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Quackbot.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.quackbot.dao.hibernate;

import java.lang.reflect.ParameterizedType;
import java.util.List;
import lombok.Data;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.quackbot.dao.GenericDAO;
import org.quackbot.dao.model.GenericEntry;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 *
 * @author Leon Blakey <lord.quackstar at gmail.com>
 */
@Transactional(propagation = Propagation.MANDATORY)
@Data
public abstract class GenericHbDAO<T extends GenericEntry> implements GenericDAO<T> {
    @Autowired
    protected SessionFactory sessionFactory;
    protected Class<T> persistentClass;

    public GenericHbDAO() {
        persistentClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    @Override
    public T findById(Long id) {
        return (T) getSession().createCriteria(getPersistentClass()).add(Restrictions.idEq(id)).uniqueResult();
    }

    @Override
    public List<T> findAll() {
        return getSession().createCriteria(getPersistentClass()).list();
    }

    @Override
    public T save(T entity) {
        getSession().save(entity);
        return entity;
    }

    @Override
    public T delete(T entity) {
        getSession().delete(entity);
        return entity;
    }

    @Override
    public T create() {
        try {
            return persistentClass.newInstance();
        } catch (Exception e) {
            //Absolutely no need to force everything that calls this to handle exceptions
            throw new RuntimeException("Can't create class " + persistentClass, e);
        }
    }

    public Session getSession() {
        return sessionFactory.getCurrentSession();
    }
}