CmdNumeratorDenominator.java

package org.geogebra.common.kernel.advanced;

import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.algos.AlgoNumeratorDenominator;
import org.geogebra.common.kernel.algos.AlgoNumeratorDenominatorFun;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.arithmetic.FunctionalNVar;
import org.geogebra.common.kernel.commands.CommandProcessor;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoNumeric;
import org.geogebra.common.main.MyError;

/**
 * Numerator[ <Function> ]
 */
public class CmdNumeratorDenominator extends CommandProcessor {

	private Commands type;

	/**
	 * Create new command processor
	 * 
	 * @param kernel
	 *            kernel
	 * @param type
	 *            Numerator or Denominator
	 */
	public CmdNumeratorDenominator(Kernel kernel, Commands type) {
		super(kernel);
		this.type = type;
	}

	@Override
	final public GeoElement[] process(Command c) throws MyError {
		int n = c.getArgumentNumber();
		GeoElement[] arg;

		switch (n) {
		case 1:
			arg = resArgs(c);

			if (arg[0] instanceof FunctionalNVar) {

				AlgoNumeratorDenominatorFun algo = new AlgoNumeratorDenominatorFun(
						cons, (FunctionalNVar) arg[0], type);
				algo.getResult().setLabel(c.getLabel());
				GeoElement[] ret = { algo.getResult() };
				return ret;

			} else if (arg[0] instanceof GeoNumeric) {
				AlgoNumeratorDenominator algo = new AlgoNumeratorDenominator(
						cons, c.getLabel(), (GeoNumeric) arg[0], type);

				GeoElement[] ret = { algo.getResult() };
				return ret;
			}
			throw argErr(app, c, arg[0]);

		default:
			throw argNumErr(app, c, n);
		}
	}
}