/* 
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org

This file is part of GeoGebra.

This program is free software; you can redistribute it and/or modify it 
under the terms of the GNU General Public License as published by 
the Free Software Foundation.

 */

package org.geogebra.common.kernel.algos;

import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoList;

public class AlgoJoin extends AlgoElement {

	private GeoList inputList; // input
	private GeoList outputList; // output
	private int size, size2;

	public AlgoJoin(Construction cons, String label, GeoList inputList) {
		super(cons);

		this.inputList = inputList;

		outputList = new GeoList(cons);

		setInputOutput();
		compute();
		outputList.setLabel(label);
	}

	@Override
	public Commands getClassName() {
		return Commands.Join;
	}

	@Override
	protected void setInputOutput() {

		// make sure that x(Element[list,1]) will work even if the output list's
		// length is zero
		outputList.setTypeStringForXML(inputList.getTypeStringForXML());

		input = new GeoElement[1];

		input[0] = inputList;

		super.setOutputLength(1);
		super.setOutput(0, outputList);
		setDependencies(); // done by AlgoElement
	}

	public GeoList getResult() {
		return outputList;
	}

	@Override
	public final void compute() {

		size = inputList.size();

		if (!inputList.isDefined()) {
			outputList.setUndefined();
			return;
		}

		outputList.setDefined(true);
		outputList.clear();

		for (int i = 0; i < size; i++) {

			GeoElement geo = inputList.get(i);
			if (!geo.isGeoList()) {
				outputList.setUndefined();
				return;
			}

			GeoList list = (GeoList) geo;
			size2 = list.size();

			if (size2 > 0) {
				for (int j = 0; j < size2; j++) {
					// GeoElement geo2 = list.get(j);
					// Application.debug(geo.getLabel() + " " +
					// geo2.getClass());
					outputList.add(list.get(j).copyInternal(cons));
				}
			}
		}
	}

}