com.codepianist.orderws.dao.AbstractDao.java Source code

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Here is the source code for com.codepianist.orderws.dao.AbstractDao.java

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package com.codepianist.orderws.dao;

import com.codepianist.DatabaseException;
import com.codepianist.orderws.model.Persistent;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 *
 * @author cesar
 * @param <T>
 */
public abstract class AbstractDao<T extends Persistent> implements Serializable {

    //

    protected static final long serialVersionUID = 1L;
    protected Class<T> entityClass;
    private final HibernateUtils hibernate = HibernateUtils.getInstance();

    //

    public AbstractDao(Class<T> entityClass) {
        this.entityClass = entityClass;
    }

    //

    public long add(T entity) throws DatabaseException {

        Session hibernateSession = null;
        long id = -1;
        try {
            hibernateSession = hibernate.getSession();
            Transaction transaction = hibernateSession.beginTransaction();
            hibernateSession.persist(entity);
            id = entity.getId();

            if (!transaction.wasCommitted())
                transaction.commit();

        } catch (Exception e) {
            throw new DatabaseException(e.getLocalizedMessage());
        } finally {
            hibernate.closeSession(hibernateSession);
        }
        return id;
    }

    public void addAll(Collection<T> entities) throws DatabaseException {
        for (T entity : entities) {
            add(entity);
        }
    }

    @SuppressWarnings("unchecked")
    public List<T> list() throws DatabaseException {
        Session hibernateSession = null;
        List<T> pojos = null;
        try {
            hibernateSession = hibernate.getSession();

            Query query = hibernateSession.createQuery("from " + entityClass.getName());
            pojos = (List<T>) query.list();

        } catch (Exception e) {
            throw new DatabaseException(e.getLocalizedMessage());
        } finally {
            hibernate.closeSession(hibernateSession);
        }
        return (List<T>) pojos;
    }

}