/*
 *  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.io.process.conditions;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.rapidminer.operator.Operator;
/**
 * 
 * @author Sebastian Land
 */
public class ParameterEqualsCondition implements ParseRuleCondition {
	protected String parameterKey;
	protected String parameterValue;
	public ParameterEqualsCondition(Element element) {
		NodeList children = element.getChildNodes();
		for (int i = 0; i < children.getLength(); i++) {
			Node child = children.item(i);
			if (child instanceof Element) {
				Element childElem = (Element)child;
				if (childElem.getTagName().equals("parameter")) {
					parameterKey = childElem.getTextContent();
				} else if (childElem.getTagName().equals("value")) {
					parameterValue = childElem.getTextContent();
				}
			}
		}
	}

	@Override
	public boolean isSatisfied(Operator operator) {
		if (parameterValue.equals("")) {
			return (!operator.getParameters().isSpecified(parameterKey)) || operator.getParameters().getParameterAsSpecified(parameterKey).equals(parameterValue);
		}

		return operator.getParameters().isSpecified(parameterKey) && operator.getParameters().getParameterAsSpecified(parameterKey).equals(parameterValue);
	}

	@Override
	public String toString() {
		return parameterKey + "='"+parameterValue+"'";
	}
}