public static ICommand CreateCommand(Arguments arguments)
{
string c = arguments.GetArgumentValueWithoutAssertion(Arguments.REQUEST_ARG);
if (!string.IsNullOrEmpty(c))
return new RestCommand(arguments);
c = arguments.GetArgumentValueWithoutAssertion(Arguments.INSTALL);
if (!string.IsNullOrEmpty(c))
return new InstallCommand(arguments);
throw new UnKnownCommandException();
}