/*
 *  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 com.rapidminer.io.process.XMLImporter;
import com.rapidminer.io.process.XMLTools;
import com.rapidminer.operator.ExecutionUnit;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorChain;
import com.rapidminer.tools.XMLException;


/** Rearranges the ordering of two subprocesses.
 * 
 * @author Simon Fischer
 *
 */
public class ExchangeSubprocessesRule extends AbstractParseRule {

	private final int subprocess1;
	private final int subprocess2;
	
	public ExchangeSubprocessesRule(String operatorTypeName, Element element) throws XMLException {
		super(operatorTypeName, element);
		subprocess1 = Integer.parseInt(XMLTools.getTagContents(element, "subprocess1"));
		subprocess2 = Integer.parseInt(XMLTools.getTagContents(element, "subprocess2"));		
	}

	@Override
	protected String apply(Operator operator, String operatorTypeName, XMLImporter importer) {
		OperatorChain chain = (OperatorChain)operator;
		ExecutionUnit unit1 = chain.getSubprocess(subprocess1);
		ExecutionUnit unit2 = chain.getSubprocess(subprocess2);
		List<Operator> ops1 = new LinkedList<Operator>(unit1.getOperators());
		List<Operator> ops2 = new LinkedList<Operator>(unit2.getOperators());
		
		for (Operator op : ops1) {
			op.remove();
		}
		for (Operator op : ops2) {
			op.remove();
		}
		
		for (Operator op : ops1) {
			unit2.addOperator(op);
		}
		for (Operator op : ops2) {
			unit1.addOperator(op);
		}		
		return "Exchanged subprocesses "+(subprocess1+1)+" and "+(subprocess2+1)+" in <var>"+operator.getName()+"</var> (<code>"+operator.getOperatorDescription().getName()+"</code>)";
	}


}