CmdCommonDenominator.java example

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geogebra-master
package org.geogebra.common.kernel.advanced;

import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.arithmetic.Command;
import org.geogebra.common.kernel.arithmetic.NumberValue;
import org.geogebra.common.kernel.cas.AlgoPolynomialCD;
import org.geogebra.common.kernel.commands.CommandProcessor;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoFunction;
import org.geogebra.common.kernel.geos.GeoNumberValue;
import org.geogebra.common.main.MyError;

/**
 * ComonDenominator[ a, b ]
 */
public class CmdCommonDenominator extends CommandProcessor {

	/**
	 * Create new command processor
	 * 
	 * @param kernel
	 *            kernel
	 */
	public CmdCommonDenominator(Kernel kernel) {
		super(kernel);
	}

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

		switch (n) {
		case 2:
			arg = resArgs(c);
			if ((ok[0] = (arg[0] instanceof NumberValue))
					&& (ok[1] = (arg[1] instanceof GeoNumberValue))) {
				AlgoCommonDenominator algo = new AlgoCommonDenominator(cons,
						c.getLabel(), (GeoNumberValue) arg[0],
						(GeoNumberValue) arg[1]);
				GeoElement[] ret = { algo.getResult() };
				return ret;

			} else if ((ok[0] = (arg[0].isGeoFunction()))
					&& (ok[1] = (arg[1].isGeoFunction()))) {
				AlgoPolynomialCD algo = new AlgoPolynomialCD(cons, c.getLabel(),
						(GeoFunction) arg[0], (GeoFunction) arg[1]);
				GeoElement[] ret = { algo.getResult() };
				return ret;
			} else {
				if (!ok[0]) {
					throw argErr(app, c, arg[0]);
				}
				throw argErr(app, c, arg[1]);
			}

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