ProjectionOrder.java

/*******************************************************************************
 *   Gisgraphy Project 
 * 
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 * 
 *   This library 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
 *   Lesser General Public License for more details.
 * 
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
 * 
 *  Copyright 2008  Gisgraphy project 
 *  David Masclet <davidmasclet@gisgraphy.com>
 *  
 *  
 *******************************************************************************/
package com.gisgraphy.hibernate.criterion;

import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.criterion.CriteriaQuery;
import org.hibernate.criterion.Order;

/**
 * A criteria that sort by an already added projection
 * 
 * @author <a href="mailto:david.masclet@gisgraphy.com">David Masclet</a>
 */
public class ProjectionOrder extends Order {

    private static final long serialVersionUID = -6838585369943470201L;
    private String aliasName;
    private boolean ascending = true;

    /**
     * @param aliasName
     *                The name of the alias we'd like to sort
     * @param ascending
     *                Whether we sort Ascending or descending
     */
    public ProjectionOrder(String aliasName, boolean ascending) {
	super(null, ascending);
	this.aliasName = aliasName;
	this.ascending = ascending;
    }

    /**
     * @param aliasName
     *                The name of the alias we'd like to sort, default sorting
     *                is ascending
     */
    public ProjectionOrder(String aliasName) {
	super(null, true);
	this.aliasName = aliasName;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.hibernate.criterion.Order#toSqlString(org.hibernate.Criteria,
     *      org.hibernate.criterion.CriteriaQuery)
     */
    @Override
    public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery)
	    throws HibernateException {
	Order nso = new NativeSQLOrder(criteriaQuery.getColumnsUsingProjection(
		criteria, aliasName)[0], this.ascending);
	return nso.toSqlString(criteria, criteriaQuery);

    }

}