text: package org.geogebra.common.kernel.commands;
  
  import org.geogebra.common.kernel.Kernel;
  import org.geogebra.common.kernel.algos.AlgoBarChart;
  import org.geogebra.common.kernel.algos.AlgoSequence;
  import org.geogebra.common.kernel.arithmetic.Command;
  import org.geogebra.common.kernel.geos.GeoElement;
  import org.geogebra.common.kernel.geos.GeoList;
  import org.geogebra.common.kernel.geos.GeoNumberValue;
  import org.geogebra.common.kernel.geos.GeoNumeric;
  import org.geogebra.common.main.MyError;
  
  /**
   * BarChart[ &lt;Number>, &lt;Number>, &lt;List> ]
   */
  public class CmdBarChart extends CommandProcessor {
  
  	/**
  	 * Create new command processor
  	 * 
  	 * @param kernel
  	 *            kernel
  	 */
  	public CmdBarChart(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].isGeoList()))
  					&& (ok[1] = (arg[1].isGeoNumeric()))) {
  
  				AlgoBarChart algo = new AlgoBarChart(cons, c.getLabel(),
  						(GeoList) arg[0], (GeoNumeric) arg[1]);
  
  				GeoElement[] ret = { algo.getSum() };
  				return ret;
  			} else if ((ok[0] = (arg[0].isGeoList()))
  					&& (ok[1] = (arg[1].isGeoList()))) {
  
  				AlgoBarChart algo = new AlgoBarChart(cons, c.getLabel(),
  						(GeoList) arg[0], (GeoList) arg[1]);
  
  				GeoElement[] ret = { algo.getSum() };
  				return ret;
  			} else {
  				throw argErr(c, getBadArg(ok, arg));
  			}
  		case 3:
  			arg = resArgs(c);
  			if ((ok[0] = (arg[0] instanceof GeoNumberValue))
  					&& (ok[1] = (arg[1] instanceof GeoNumberValue))
  					&& (ok[2] = (arg[2].isGeoList()))) {
  
  				AlgoBarChart algo = new AlgoBarChart(cons, c.getLabel(),
  						(GeoNumberValue) arg[0], (GeoNumberValue) arg[1],
  						(GeoList) arg[2]);
  
  				GeoElement[] ret = { algo.getSum() };
  				return ret;
  			} else if ((ok[0] = (arg[0].isGeoList()))
  					&& (ok[1] = (arg[1].isGeoList()))
  					&& (ok[2] = (arg[2] instanceof GeoNumberValue))) {
  
  				AlgoBarChart algo = new AlgoBarChart(cons, c.getLabel(),
  						(GeoList) arg[0], (GeoList) arg[1],
  						(GeoNumberValue) arg[2]);
  
  				GeoElement[] ret = { algo.getSum() };
  				return ret;
  			}
  			if ((ok[0] = (arg[0].isGeoList()))
  					&& (ok[1] = (arg[1].isGeoNumeric()))
  					&& (ok[2] = (arg[2].isGeoNumeric()))) {
  
  				AlgoBarChart algo = new AlgoBarChart(cons, c.getLabel(),
  						(GeoList) arg[0], (GeoNumeric) arg[1],
  						(GeoNumeric) arg[2]);
  
  				GeoElement[] ret = { algo.getSum() };
  				return ret;
  			}
  
  			throw argErr(c, getBadArg(ok, arg));
  
  		case 6:
  			// create local variable at position 3 and resolve arguments
  			arg = resArgsLocalNumVar(c, 3, 4, 5);
  			if ((ok[0] = (arg[0] instanceof GeoNumberValue))
  					&& (ok[1] = arg[1] instanceof GeoNumberValue)
  					&& (ok[2] = arg[2].isGeoElement())
  					&& (ok[3] = arg[3].isGeoNumeric())
  					&& (ok[4] = arg[4] instanceof GeoNumberValue)
  					&& (ok[5] = arg[5] instanceof GeoNumberValue)) {
  				GeoElement[] ret = { barChart(c.getLabel(),
  						(GeoNumberValue) arg[0], (GeoNumberValue) arg[1],
  						arg[2], (GeoNumeric) arg[3], (GeoNumberValue) arg[4],
  						(GeoNumberValue) arg[5], null) };
  				return ret;
  			}
  			throw argErr(c, getBadArg(ok, arg));
  
  		case 7:
  			// create local variable at position 3 and resolve arguments
  			arg = resArgsLocalNumVar(c, 3, 4, 6);
  			if ((ok[0] = (arg[0] instanceof GeoNumberValue))
  					&& (ok[1] = (arg[1] instanceof GeoNumberValue))
  					&& ((ok[2] = arg[2].isGeoElement()))
  					&& (ok[3] = arg[3].isGeoNumeric())
  					&& (ok[4] = arg[4] instanceof GeoNumberValue)
  					&& (ok[5] = arg[5] instanceof GeoNumberValue)
  					&& (ok[6] = arg[6] instanceof GeoNumberValue)) {
  				GeoElement[] ret = { barChart(c.getLabel(),
  						(GeoNumberValue) arg[0], (GeoNumberValue) arg[1],
  						arg[2], (GeoNumeric) arg[3], (GeoNumberValue) arg[4],
  						(GeoNumberValue) arg[5], (GeoNumberValue) arg[6]) };
  				return ret;
  			}
  			throw argErr(c, getBadArg(ok, arg));
  
  		default:
  			throw argNumErr(c);
  		}
  	}
  
  	/**
  	 * BarChart
  	 */
  	final private GeoNumeric barChart(String label, GeoNumberValue a,
  			GeoNumberValue b, GeoElement expression, GeoNumeric localVar,
  			GeoNumberValue from, GeoNumberValue to, GeoNumberValue step) {
  
  		AlgoSequence seq = new AlgoSequence(cons, expression, localVar, from,
  				to, step);
  		cons.removeFromConstructionList(seq);
  
  		AlgoBarChart algo = new AlgoBarChart(cons, label, a, b,
  				(GeoList) seq.getOutput()[0]);
  		GeoNumeric sum = algo.getSum();
  		return sum;
  	}
  }
  