/// <summary>
/// Method that parses the supplied arguments which typically are supplied from the command line.
/// </summary>
/// <returns>An instance of <typeparamref name="TOptions"/> with values populated according to the inputs
/// supplied by the user.</returns>
/// <param name="arguments">A set of parameters provided by the user on the command line.</param>
/// <exception cref="OptionRequiredException"/>
/// <example>
/// <code>MyApplicationOptions Parse("name=usera password=pwd")</code>
/// </example>
public TOptions Parse(params string [] arguments)
{
TOptions options = new TOptions();
// Parse the arguments and apply the default values to the options.
_arguments.SetDefaults(options);
// If there are any command line arguments supplied, then process them into the options file...
if (arguments != null && arguments.Count() > 0)
{
OnParse(options, arguments);
}
else
{
// No arguments have been supplied, so check that there aren't any defaults that have been skipped.
PropertyArgumentAttribute attribute = _arguments.FirstOrDefault(required => required.Required);
if (attribute != null)
{
throw new OptionRequiredException(string.Format("Switch/Parameter '{0}' is required.", attribute.ParameterName));
}
}
return(options);
}
/// <summary>
/// Method that sets up the command line arguments set.
/// </summary>
/// <returns></returns>
public static CommandLineArguments <TOptions> Setup()
{
Type optionsType = typeof(TOptions);
CommandLineOptionsAttribute options = optionsType.GetCustomAttributes(typeof(CommandLineOptionsAttribute), true).Cast <CommandLineOptionsAttribute>().FirstOrDefault();
// Walk all of the properties in the options file.
PropertyInfo [] properties = optionsType.GetProperties();
List <PropertyArgumentAttribute> arguments = new List <PropertyArgumentAttribute>();
foreach (PropertyInfo propertyInfo in properties)
{
PropertyArgumentAttribute attribute = propertyInfo.GetCustomAttributes(typeof(PropertyArgumentAttribute), true).Cast <PropertyArgumentAttribute>().SingleOrDefault();
if (attribute != null)
{
attribute.Configure(propertyInfo);
arguments.Add(attribute);
}
}
return(new CommandLineArguments <TOptions>(options, arguments));
}
