/*
 * ECatalog is a database front-end, with two main features:
 * 1. Use of preferences
 *  A preference-based approach, where the user is allowed to define the importance of each criterion.
 *  Then the items are ranked accordingly to his criteria.
 * 2. Trade-off analysis
 *  A cooperative database approach, where the system "argues" with the user about his criteria.
 *  When there are no matching items, the system explains the minimal conflicting set and
 *  give some possible strong and weak relaxations about his criteria.
 * This package also containts the software and the set-up details used for our User Study,
 * comparing the use or not of the two previous features mentioned above.
 *
 * Copyright (C) 2006 David Portabella Clotet, Artificial Intelligence Laboratory, EPFL
 * 
 * This file is part of ecatalog-1.0.zip
 * 
 * ECatalog is free software and a free user study set-up;
 * 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.
 * 
 * ECatalog 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 ECatalog; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * @version 1.0
 * @author David Portabella
 * To contact the author:
 * email: david@portabella.name and david.portabella@epfl.ch
 * 
 * More information about ECatalog:
 *  http://sourceforge.net/projects/ecatalog/
 *  http://icwww.epfl.ch/~portabel/ecatalogs/
 */

package ecatalog.db;

import java.sql.*;

public class DefaultItem implements Item {
    /* the value index for each attribute */
    int[] valuesIndex;

    public DefaultItem(int[] valuesIndex) { this.valuesIndex = valuesIndex; }

    public static DefaultItem createFromResultSet(Database db, ResultSet rs) throws SQLException {
	int numAttributes = db.getNbrAttributes();
	int[] valuesIndex = new int[numAttributes];
	for (int i = 0; i < numAttributes; i++) {
	    Attribute at = db.getAttribute(i);
	    valuesIndex[i] = at.getValueIndex(rs);
	}
	return new DefaultItem(valuesIndex);
    }

    public static DefaultItem createFromItem(Database db, Item item) throws SQLException {
	int numAttributes = db.getNbrAttributes();
	int[] valuesIndex = new int[numAttributes];
	for (int i = 0; i < numAttributes; i++) {
	    Attribute at = db.getAttribute(i);
	    valuesIndex[i] = at.getValueIndex(item);
	}
	return new DefaultItem(valuesIndex);
    }

    public int getValueIndex(int attributeIndex) {
	return valuesIndex[attributeIndex];
    }
}