CmdErlang.java

package org.geogebra.common.kernel.statistics;

import org.geogebra.common.kernel.Kernel;
import org.geogebra.common.kernel.StringTemplate;
import org.geogebra.common.kernel.arithmetic.BooleanValue;
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.GeoFunction;
import org.geogebra.common.kernel.geos.GeoNumberValue;
import org.geogebra.common.main.MyError;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

/**
 * Erlang Distribution
 */
public class CmdErlang extends CommandProcessor {

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

	@Override
	@SuppressFBWarnings({ "SF_SWITCH_FALLTHROUGH",
			"missing break is deliberate" })
	public GeoElement[] process(Command c) throws MyError {
		int n = c.getArgumentNumber();
		boolean[] ok = new boolean[n];
		GeoElement[] arg;

		arg = resArgs(c);

		BooleanValue cumulative = null; // default for n=3
		switch (n) {
		case 4:
			if (!arg[2].isGeoFunction() || !((GeoFunction) arg[2])
					.toString(StringTemplate.defaultTemplate).equals("x")) {
				throw argErr(app, c, arg[1]);
			}

			if (arg[3].isGeoBoolean()) {
				cumulative = (BooleanValue) arg[3];
			} else {
				throw argErr(app, c, arg[3]);
			}

			// fall through
		case 3:
			if ((ok[0] = arg[0] instanceof GeoNumberValue)
					&& (ok[1] = arg[1] instanceof GeoNumberValue)) {
				if (arg[2].isGeoFunction() && ((GeoFunction) arg[2])
						.toString(StringTemplate.defaultTemplate).equals("x")) {

					AlgoErlangDF algo = new AlgoErlangDF(cons, c.getLabel(),
							(GeoNumberValue) arg[0], (GeoNumberValue) arg[1],
							cumulative);
					return algo.getResult().asArray();

				} else if (arg[2] instanceof GeoNumberValue) {

					AlgoErlang algo = new AlgoErlang(cons, c.getLabel(),
							(GeoNumberValue) arg[0], (GeoNumberValue) arg[1],
							(GeoNumberValue) arg[2]);
					return algo.getResult().asArray();

				} else {
					throw argErr(app, c, arg[2]);
				}

			} else if (!ok[0]) {
				throw argErr(app, c, arg[0]);
			} else if (!ok[1]) {
				throw argErr(app, c, arg[1]);
			}

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