/*
 * MiningMart Version 1.0
 * 
 * Copyright (C) 2006 Martin Scholz, Timm Euler, 
 *                    Daniel Hakenjos, Katharina Morik
 *
 * Contact: miningmart@ls8.cs.uni-dortmund.de
 *
 * A list of contributing developers (other than the copyright 
 * holders) can be found at
 * http://mmart.cs.uni-dortmund.de/downloads/download.html
 * 
 * This program 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 program 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 program, see the file MM_HOME/LICENSE; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301, USA.
 */
package edu.udo.cs.miningmart.operator.uep;

import edu.udo.cs.miningmart.m4.Column;
import edu.udo.cs.miningmart.m4.Value;
import edu.udo.cs.miningmart.m4.utils.Print;
import edu.udo.cs.miningmart.exception.M4CompilerError;
import edu.udo.cs.miningmart.operator.FeatureConstruction;

/**
 * <p>M4 Compiler</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: University Dortmund</p>
 *
 * @author Felix Koschin
 * @version $Id: Discretization.java,v 1.6 2006/04/11 14:10:18 euler Exp $
 */
public abstract class Discretization extends FeatureConstruction
{

	//~ Constructors ..........................................................

	public Discretization()
	{
		super();
	}

	//~ Methods ...............................................................

	abstract Value getClosedTo() throws M4CompilerError;
	abstract double[] generateCutPoints(Column theTargetAttributeColumn) throws M4CompilerError;
	public String[] generateLabels(int num) throws M4CompilerError
	{
		String[] labels = new String[num];
		int i;

		for (i = 0; i < num; i++)
				labels[i] = "_" + (i + 1);
		return labels;
	}

	public String generateSQL(Column theTargetAttributeColumn) throws M4CompilerError
	{
		boolean closedToRight = false;
		String f, s;

		if ((getClosedTo().getValue()).equalsIgnoreCase("right")) closedToRight = true;
		double[] myCP = generateCutPoints(theTargetAttributeColumn);
		String[] myL = this.generateLabels(myCP.length + 1);

		f = "(CASE ";
		for (int i = 0; i < myCP.length; i++){
			f = f + "WHEN " + theTargetAttributeColumn.getSQLDefinition() + " <";
			if (closedToRight) f = f + "=";
			f = f + " " + myCP[i] + " THEN ('" + myL[i] + "') ";
			s = myCP[i] + "<";
			if (closedToRight) s = s + "=";
			s = s + "'" + myL[i] + "'\n";
		}

		f = f + "ELSE ('" + myL[myL.length - 1] + "') END)";

		doPrint(Print.OPERATOR, "String returned by discretization: " + f);
		return f;
	}
}
/*
 * $Log: Discretization.java,v $
 * Revision 1.6  2006/04/11 14:10:18  euler
 * Updated license text.
 *
 * Revision 1.5  2006/04/06 16:31:17  euler
 * Prepended license remark.
 *
 * Revision 1.4  2006/03/30 16:07:14  scholz
 * fixed author tags for release
 *
 * Revision 1.3  2006/03/23 11:13:46  euler
 * Improved exception handling.
 *
 * Revision 1.2  2006/03/06 08:37:34  euler
 * *** empty log message ***
 *
 * Revision 1.1  2006/01/03 09:54:35  hakenjos
 * Initial version!
 *
 */
