CmdNpR.java

package org.geogebra.common.kernel.statistics;

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

/**
 * nPr[number,number]
 * 
 * @author zbynek
 */
public class CmdNpR extends CommandProcessor {

	/**
	 * Creates new command processor
	 * 
	 * @param kernel
	 *            kernel
	 */
	public CmdNpR(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 GeoNumberValue))
					&& (ok[1] = (arg[1] instanceof GeoNumberValue))) {

				AlgoNpR algo = new AlgoNpR(cons, c.getLabel(),
						(GeoNumberValue) arg[0], (GeoNumberValue) arg[1]);

				GeoElement[] ret = { algo.getResult() };
				return ret;
			}
			if (!ok[0]) {
				throw argErr(app, c, arg[0]);
			}
			throw argErr(app, c, arg[1]);

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

}