/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 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.operator.ports.metadata;

/**
 * @author Simon Fischer
 */
public class MDInteger extends MDNumber<Integer> {

	private static final long serialVersionUID = 1L;

	/**
	 * This constructor will build a unkown number
	 */
	public MDInteger() {
		super(0);
	}

	public MDInteger(int i) {
		super(i);
	}

	public MDInteger(MDInteger integer) {
		super(integer);
	}

	@Override
	public MDInteger add(Integer add) {
		setNumber(getNumber() + add);
		return this;
	}

	public void add(MDInteger add) {
		setNumber(getNumber() + add.getNumber());
		switch (add.getRelation()) {
		case AT_LEAST:
			increaseByUnknownAmount();
			break;
		case AT_MOST:
			reduceByUnknownAmount();
			break;
		case UNKNOWN:
			setUnkown();
		}
	}

	@Override
	public MDInteger multiply(double factor) {
		Integer current = getNumber();
		if (current != null) {
			setNumber((int)Math.round(current * factor));		
		}
		return this;
	}

	public MDInteger subtract(int subtrahend) {
		Integer current = getNumber();
		if (current != null) {
			setNumber((int)current - subtrahend);		
		}
		return this;
	}

	@Override
	public MDInteger copy() {
		return new MDInteger(this);
	}

	@Override
	public String toString() {
		switch (getRelation()) {
		case EQUAL: return "= " + getValue();
		case AT_LEAST: return "\u2265 " + getNumber();
		case AT_MOST: return "\u2264 " + getNumber();
		case UNKNOWN:
		default:
			return "?";
		}
	}
	
	
}