private string ProcessListEventsCommand(Command command)
{
DateTime eventDate = DateTime.ParseExact(
command.Arguments[0],
DateTimeFormat,
CultureInfo.InvariantCulture);
int numberOfElementsToList = int.Parse(command.Arguments[1]);
// BOTTLENECK: Converting an IEnumerable<T> collection to List collection can be slow
// when the elements in the IEnumerable<T> collection are not stored
// in a collection that implements IList<T>.
// FIX: In this case no convertion is neeed because IEnumrabl<T> collection can be
// traversed with a foreach loop.
IEnumerable<Event> events = this.eventsManager.ListEvents(eventDate, numberOfElementsToList);
if (events.Count() != 0)
{
StringBuilder output = new StringBuilder();
foreach (Event currentEvent in events)
{
output.AppendLine(currentEvent.ToString());
}
return output.ToString().Trim();
}
else
{
return NoEventsFoundMessage;
}
}
public string ProcessCommand(Command command)
{
switch (command.Name)
{
case AddEventCommandName:
if (command.Arguments.Length < 2 || command.Arguments.Length > 3)
{
throw new ArgumentException(
"'AddEvent' command has invalid number of arguments! " +
"Only two or three arguments can be passed!");
}
return this.ProcessAddCommand(command);
case DeleteEventsCommandName:
if (command.Arguments.Length != 1)
{
throw new ArgumentException(
"'DeleteEvents' command has invalid number of arguments! " +
"Only one argument can be passed!");
}
return this.ProcessDeleteCommand(command);
case ListEventsCommandName:
if (command.Arguments.Length != 2)
{
throw new ArgumentException(
"'ListEvents' command has invalid number of arguments! " +
"Only two arguments can be passed!");
}
return this.ProcessListEventsCommand(command);
default:
throw new ArgumentException(
string.Format("Invalid input command: {0}!", command.Name),
"inputCommand");
}
}
public static Command Parse(string inputCommand)
{
int nameEndIndex = inputCommand.IndexOf(CommandNameSeparator);
if (nameEndIndex == -1)
{
throw new FormatException(
string.Format("Invalid input command: {0}! Command cannot be 1 word!", inputCommand));
}
string commandName = inputCommand.Substring(0, nameEndIndex);
string argumentsSubstring = inputCommand.Substring(nameEndIndex + 1);
string[] commandArguments = argumentsSubstring.Split(
CommandArgumentsSeparators,
StringSplitOptions.RemoveEmptyEntries);
TrimArguments(commandArguments);
Command command = new Command();
command.Name = commandName;
command.Arguments = commandArguments;
return command;
}
private string ProcessAddCommand(Command command)
{
DateTime eventDate = DateTime.ParseExact(
command.Arguments[0],
DateTimeFormat,
CultureInfo.InvariantCulture);
Event newEvent = new Event();
newEvent.Date = eventDate;
newEvent.Title = command.Arguments[1];
if (command.Arguments.Length == 3)
{
newEvent.Location = command.Arguments[2];
}
else
{
newEvent.Location = null;
}
this.eventsManager.AddEvent(newEvent);
return EventAddedMessage;
}
private string ProcessDeleteCommand(Command command)
{
int deletedEventsCount = this.eventsManager.DeleteEventsByTitle(command.Arguments[0]);
if (deletedEventsCount == 0)
{
return NoEventsFoundMessage;
}
else
{
return deletedEventsCount + DeletedEventsMessage;
}
}
