/// <summary>
/// Checks the passed parameters. This consists of two steps which are overrideable by concrete commands.
/// 1.) Check the number of parameters.
/// 2.) Check the values of all passed parameters
/// Template Method Pattern: Template Method.
/// </summary>
/// <param name="outputter">The outputter must be used to printout any error description.</param>
/// <returns>
/// - true if number and values of the parameters are correct. Execute() may use the parameters afterwards unchecked.
/// - false if the number is below or above excepted range or if any value is incorrect. An explaining error message must be given
/// by the concrete command.
/// </returns>
public bool CheckParameters(IOutputter outputter)
{
if (!CheckNumberOfParameters(parameters.Count))
{
outputter.PrintLine(INCORRECT_SYNTAX);
return(false);
}
if (!CheckParameterValues(outputter))
{
if (!outputter.HasCharactersPrinted())
{
outputter.PrintLine(DEFAULT_ERROR_MESSAGE_WRONG_PARAMETER);
}
return(false);
}
return(true);
}
public void HasCharactersPrinted_ByDefault_IsFalse()
{
Assert.IsFalse(outputter.HasCharactersPrinted());
Assert.AreEqual(0, outputter.NumberOfCharactersPrinted());
}