/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2008 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.example.table;

import java.util.List;

import com.rapidminer.example.Attribute;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.Statistics;
import com.rapidminer.tools.RandomGenerator;


/**
 * This class is used for example sets which should provide random values for
 * the given attributes, i.e. each random value lies in the same range as values
 * of the given attributes (min and max) of the base example set. Please note that the attributes must
 * already have proper minimum and maximum values. The random values are
 * constructed by a {@link RandomDataRowReader}.
 * 
 * @author Ingo Mierswa
 * @version $Id: RandomExampleTable.java,v 2.9 2006/04/05 08:57:22 ingomierswa
 *          Exp $
 */
public class RandomExampleTable extends AbstractExampleTable {

	private static final long serialVersionUID = 5675878166499224680L;
	
    private ExampleSet baseExampleSet;
    
	private int size;

	public RandomExampleTable(ExampleSet baseExampleSet, List<Attribute> attributes, int size) {
		super(attributes);
        this.baseExampleSet = baseExampleSet;
		this.size = size;
	}

	public DataRowReader getDataRowReader() {
		return new RandomDataRowReader(baseExampleSet, getAttributes(), size);
	}

	public DataRow getDataRow(int index) {
		RandomGenerator random = RandomGenerator.getRandomGenerator(-1);
		double[] data = new double[size];
		for (int i = 0; i < data.length; i++) {
            double min = baseExampleSet.getStatistics(getAttributes()[i], Statistics.MINIMUM);
            double max = baseExampleSet.getStatistics(getAttributes()[i], Statistics.MAXIMUM);
			data[i] = random.nextDoubleInRange(min, max);
		}
		return new DoubleArrayDataRow(data);
	}

	public int size() {
		return size;
	}
}