/*
 *  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.rules;

import java.util.LinkedList;
import java.util.List;

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

import com.rapidminer.io.process.XMLImporter;
import com.rapidminer.io.process.conditions.ParameterEqualsCondition;
import com.rapidminer.io.process.conditions.ParameterUnequalsCondition;
import com.rapidminer.io.process.conditions.ParseRuleCondition;
import com.rapidminer.operator.Operator;
import com.rapidminer.tools.LogService;
import com.rapidminer.tools.XMLException;

/**
 * This is the super class of all ParseRules with depend on one or more conditions.
 * @author Sebastian Land
 *
 */
public abstract class AbstractConditionedParseRule extends AbstractParseRule {

	private final List<ParseRuleCondition> conditions = new LinkedList<ParseRuleCondition>();

	public AbstractConditionedParseRule(String operatorTypeName, Element element) throws XMLException {
		super(operatorTypeName, 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("condition")) {
					parseCondition(childElem);
				}
			}
		}
	}


	protected void parseCondition(Element childElem) {
		NodeList conditionNodes = childElem.getChildNodes();
		for (int j = 0; j < conditionNodes.getLength(); j++) {
			Node conditionNode = conditionNodes.item(j);
			if (conditionNode instanceof Element) {
				Element conditionElem = (Element)conditionNode;
				if (conditionElem.getTagName().equals("parameter_equals")) {
					conditions.add(new ParameterEqualsCondition((Element)conditionNode));
				} else if (conditionElem.getTagName().equals("parameter_unequals")) {
					conditions.add(new ParameterUnequalsCondition((Element)conditionNode));
				} else {
					LogService.getRoot().warning("Unknown condition: "+conditionElem.getTagName());
				}
			}
		}
	}
	

	@Override
	protected String apply(Operator operator, String operatorTypeName, XMLImporter importer) {
		for (ParseRuleCondition condition: conditions)
			if (!condition.isSatisfied(operator))
				return null;
		return conditionedApply(operator, operatorTypeName, importer);
	}

	protected abstract String conditionedApply(Operator operator, String operatorTypeName, XMLImporter importer);
}