public void MoveForward()
{
if (this.Status != RobotStatus.On)
{
_exceptionFactory.GenerateSafeException($"please place this robot first");
}
if (!MovableResponses.MoveForwardOneStep(this.Position, _surface))
{
_exceptionFactory.GenerateSafeException($"the robot cannot move to expected postion");
}
}
public async Task <float> GetAverageCubicWeightByCategory(string category)
{
var cubicWeights = await _fetchService.GetProductInfoByCategory <float>(WeightCalculator, category);
if (!(cubicWeights?.Any() ?? false))
{
_exceptionFactory.GenerateSafeException("No products found in the remote api!");
}
return(cubicWeights.Average());
}
/// <summary>
/// get a command instance by a given command string
/// </summary>
/// <returns>The command instance</returns>
/// <param name="commandLine">a string of command line</param>
public ICommand GetCommand(string commandLine, IRobot robot)
{
ICommand cmd = null;
//C# 7 new feature Tuples
var(action, parameters) = getCommandInfo();
try
{
switch (action)
{
case RobotCommand.PLACE:
cmd = new PlaceCommand(robot, parameters, _exceptionFactory);
break;
case RobotCommand.MOVE:
cmd = new MoveCommand(robot);
break;
case RobotCommand.LEFT:
cmd = new LeftCommand(robot);
break;
case RobotCommand.RIGHT:
cmd = new RightCommand(robot);
break;
case RobotCommand.REPORT:
cmd = new ReportCommand(robot);
break;
default:
_exceptionFactory.GenerateWarningException($"Unkown command {commandLine}");
break;
}
}
catch (InvalidCastException)
{
_exceptionFactory.GenerateSafeException($"The current robot is not able to execute the {action.ToString()} command");
}
return(cmd);
//C# 7 new feature local function
(RobotCommand action, string parameters) getCommandInfo()
{
commandLine = commandLine.Trim();
int index = commandLine.IndexOf(" ", StringComparison.CurrentCulture);
var robotCommand = (RobotCommand)Enum.Parse(typeof(RobotCommand), (index > 0 ? commandLine.Substring(0, index) : commandLine).ToUpper());
var commandParams = index > 0 ? commandLine.Substring(index + 1) : string.Empty;
return(robotCommand, commandParams);
}
}
public PlaceCommand(IRobot robot, string parameters, IExceptionFactory exceptionFactory) : base(robot)
{
var parameterArray = parameters.Trim().Split(' ');
try
{
_position = new RobotPosition();
_position.X = int.Parse(parameterArray[0]);
_position.Y = int.Parse(parameterArray[1]);
_position.Direction = (CompassDirections)Enum.Parse(typeof(CompassDirections), parameterArray[2].ToUpper());
}
catch
{
exceptionFactory.GenerateSafeException($"invalid parameters [{parameters}] for the {Command.ToString()} command");
}
}
