com.emergya.persistenceGeo.dao.impl.GenericHibernateDAOImpl.java Source code

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Here is the source code for com.emergya.persistenceGeo.dao.impl.GenericHibernateDAOImpl.java

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/*
 * GenericHibernateDAOImpl.java
 * 
 * Copyright (C) 2012
 * 
 * This file is part of Proyecto persistenceGeo
 * 
 * This software 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 2 of the License, or (at your option) any
 * later version.
 * 
 * This software 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
 * this library; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * As a special exception, if you link this library with other files to produce
 * an executable, this library does not by itself cause the resulting executable
 * to be covered by the GNU General Public License. This exception does not
 * however invalidate any other reasons why the executable file might be covered
 * by the GNU General Public License.
 */
package com.emergya.persistenceGeo.dao.impl;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.LockMode;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Example;
import org.hibernate.criterion.Projections;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.emergya.persistenceGeo.dao.GenericDAO;

/**
 * Based on http://community.jboss.org/docs/DOC-13955
 * @param <T> entity type
 * @param <ID> primary key
 */
public abstract class GenericHibernateDAOImpl<T, ID extends Serializable> extends HibernateDaoSupport
        implements GenericDAO<T, ID> {

    protected Class<T> persistentClass;

    @Autowired
    public void init(SessionFactory sessionFactory) {
        setSessionFactory(sessionFactory);
    }

    @SuppressWarnings({ "unchecked" })
    public GenericHibernateDAOImpl() {
        try {
            persistentClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
                    .getActualTypeArguments()[0];
        } catch (ClassCastException e) {
            //can be raised when DAO is inherited twice
            persistentClass = (Class<T>) ((ParameterizedType) getClass().getSuperclass().getGenericSuperclass())
                    .getActualTypeArguments()[0];
        }
    }

    public T findById(Long id, boolean lock) {
        T entity;
        if (lock) {
            entity = (T) getHibernateTemplate().get(persistentClass, id, LockMode.PESSIMISTIC_WRITE);
        } else {
            entity = (T) getHibernateTemplate().get(persistentClass, id);
        }

        return entity;
    }

    public List<T> findAll() {
        return findByCriteria();
    }

    @SuppressWarnings("unchecked")
    public List<T> findAllFromTo(Integer first, Integer last) {
        Criteria criteria = getSession().createCriteria(persistentClass);
        criteria.setFirstResult(first);
        criteria.setMaxResults(last - first);
        return criteria.list();
    }

    @SuppressWarnings("unchecked")
    public List<T> findByExample(T exampleInstance, String[] excludeProperty) {
        DetachedCriteria crit = DetachedCriteria.forClass(persistentClass);
        Example example = Example.create(exampleInstance);
        for (String exclude : excludeProperty) {
            example.excludeProperty(exclude);
        }
        crit.add(example);
        return getHibernateTemplate().findByCriteria(crit);
    }

    public T makePersistent(T entity) {
        getHibernateTemplate().saveOrUpdate(entity);
        return entity;
    }

    public void makeTransient(T entity) {
        getHibernateTemplate().delete(entity);
    }

    public Long getResults() {
        return (Long) getSession().createCriteria(persistentClass).setProjection(Projections.count("id"))
                .uniqueResult();
    }

    /**
     * Use this inside subclasses as a convenience method.
     */
    @SuppressWarnings("unchecked")
    protected List<T> findByCriteria(Criterion... detachedCriterias) {
        DetachedCriteria crit = DetachedCriteria.forClass(persistentClass);
        for (Criterion c : detachedCriterias) {
            crit.add(c);
        }
        return getHibernateTemplate().findByCriteria(crit);
    }

}