/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.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;

import com.rapidminer.tools.LogService;

import java.util.logging.Level;


/**
 * Attribute statistics object for (pseudo-)numerical attributes like real numerical attributes or
 * date attributes.
 * 
 * @author Ingo Mierswa
 */
public class MinMaxStatistics implements Statistics {

	private static final long serialVersionUID = 1027895282018510951L;

	private double minimum = Double.POSITIVE_INFINITY;

	private double maximum = Double.NEGATIVE_INFINITY;

	public MinMaxStatistics() {}

	/** Clone constructor. */
	private MinMaxStatistics(MinMaxStatistics other) {
		this.minimum = other.minimum;
		this.maximum = other.maximum;
	}

	@Override
	public Object clone() {
		return new MinMaxStatistics(this);
	}

	@Override
	public void count(double value, double weight) {
		if (!Double.isNaN(value)) {
			if (minimum > value) {
				minimum = value;
			}
			if (maximum < value) {
				maximum = value;
			}
		}
	}

	@Override
	public double getStatistics(Attribute attribute, String name, String parameter) {
		if (MINIMUM.equals(name)) {
			return this.minimum;
		} else if (MAXIMUM.equals(name)) {
			return this.maximum;
		} else {
			// LogService.getRoot().warning("Cannot calculate statistics, unknown type: " + name);
			LogService.getRoot().log(Level.WARNING, "com.rapidminer.example.MinMaxStatistics.calculating_statistics_error",
					name);
			return Double.NaN;
		}
	}

	@Override
	public boolean handleStatistics(String name) {
		return MINIMUM.equals(name) || MAXIMUM.equals(name);
	}

	@Override
	public void startCounting(Attribute attribute) {
		this.minimum = Double.POSITIVE_INFINITY;
		this.maximum = Double.NEGATIVE_INFINITY;
	}
}