chiron.maxscore.dao.impl.BaseDAOImpl.java Source code

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package chiron.maxscore.dao.impl;

import chiron.maxscore.dao.BaseDAO;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Projections;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * Hibernate BaseDAOImpl
 *
 * @author Diluka
 * @param <E> 
 */
public abstract class BaseDAOImpl<E> implements BaseDAO<E> {

    /**
     * 
     */
    private final Class<E> entityClass = (Class<E>) ((ParameterizedType) getClass().getGenericSuperclass())
            .getActualTypeArguments()[0];

    /**
     * Hibernate Session
     */
    @Autowired
    protected SessionFactory sessionFactory;

    /**
     * ?
     *
     * @param id 
     * @return null
     */
    @Override
    public E getById(Serializable id) {
        Session session = sessionFactory.getCurrentSession();
        Object o = session.get(entityClass, id);
        return o == null ? null : (E) o;
    }

    /**
     * ?
     *
     * @param e 
     */
    @Override
    public void save(E e) {
        Session session = sessionFactory.getCurrentSession();
        session.saveOrUpdate(e);
    }

    /**
     * 
     *
     * @param e 
     */
    @Override
    public void delete(E e) {
        Session session = sessionFactory.getCurrentSession();
        session.delete(e);
    }

    /**
     * ?
     *
     * @return List
     */
    @Override
    public List<E> getAll() {
        Session session = sessionFactory.getCurrentSession();
        return session.createCriteria(entityClass).list();
    }

    /**
     * 
     *
     * @param start ?
     * @param limit ?
     * @param criteria ?
     * @return List
     */
    @Override
    public List<E> search(int start, int limit, DetachedCriteria criteria) {
        Session session = sessionFactory.getCurrentSession();
        return criteria.getExecutableCriteria(session).setFirstResult(start).setMaxResults(limit).list();
    }

    /**
     * ??
     *
     * @param criteria ?
     * @return 
     */
    @Override
    public int count(DetachedCriteria criteria) {
        Session session = sessionFactory.getCurrentSession();
        return ((Number) criteria.setProjection(Projections.rowCount()).getExecutableCriteria(session)
                .uniqueResult()).intValue();
    }
}