public static T TryParse <T>(CrontabFieldKind kind, string expression, Converter <CrontabField, T> valueSelector, Converter <ExceptionProvider, T> errorSelector)
{
var field = new CrontabField(CrontabFieldImpl.FromKind(kind));
var error = field._impl.TryParse(expression, field.Accumulate, null, e => e);
return(error == null?valueSelector(field) : errorSelector(error));
}
/// <summary>
///
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="expression"></param>
/// <param name="options"></param>
/// <param name="valueSelector"></param>
/// <param name="errorSelector"></param>
/// <returns></returns>
public static T TryParse <T>(string expression, ParseOptions options, Converter <CrontabSchedule, T> valueSelector, Converter <ExceptionProvider, T> errorSelector)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
var tokens = expression.Split(StringSeparatorStock.Space, StringSplitOptions.RemoveEmptyEntries);
var includingSeconds = options != null && options.IncludingSeconds;
var expectedTokenCount = includingSeconds ? 6 : 5;
if (tokens.Length < expectedTokenCount || tokens.Length > expectedTokenCount)
{
return(errorSelector(() =>
{
var message = string.Format(
"'{0}' is an invalid crontab expression. It must contain {1}.",
expression,
includingSeconds
? "6 components of a schedule in the sequence of seconds, minutes, hours, days, months, and days of week"
: "5 components of a schedule in the sequence of minutes, hours, days, months, and days of week");
return new CrontabException(message);
}));
}
var fields = new CrontabField[6];
var offset = includingSeconds ? 0 : 1;
for (var i = 0; i < tokens.Length; i++)
{
var kind = (CrontabFieldKind)i + offset;
var field = CrontabField.TryParse(kind, tokens[i], v => new { ErrorProvider = (ExceptionProvider)null, Value = v },
e => new { ErrorProvider = e, Value = (CrontabField)null });
if (field.ErrorProvider != null)
{
return(errorSelector(field.ErrorProvider));
}
fields[i + offset] = field.Value;
}
return(valueSelector(new CrontabSchedule(fields[0], fields[1], fields[2], fields[3], fields[4], fields[5])));
}
CrontabSchedule(
CrontabField seconds,
CrontabField minutes, CrontabField hours,
CrontabField days, CrontabField months,
CrontabField daysOfWeek)
{
Debug.Assert(minutes != null);
Debug.Assert(hours != null);
Debug.Assert(days != null);
Debug.Assert(months != null);
Debug.Assert(daysOfWeek != null);
_seconds = seconds;
_minutes = minutes;
_hours = hours;
_days = days;
_months = months;
_daysOfWeek = daysOfWeek;
}