/// <inheritdoc/>
public void ReadIcs(IcsReader reader)
{
ContentLine content;
while (null != (content = reader.ReadContentLine()))
{
switch (content.Name.ToLowerInvariant())
{
case "begin":
SeasonalChange adjustment;
switch (content.Value.ToLowerInvariant())
{
case "standard": adjustment = new StandardChange(); break;
case "daylight": adjustment = new DaylightChange(); break;
default:
throw new CalendarException(string.Format("'{0}' is not a component of a time zone.", content.Value));
}
adjustment.ReadIcs(reader);
Adjustments.Add(adjustment);
break;
case "end":
if (!content.Value.Equals(Component.Names.TimeZone, StringComparison.InvariantCultureIgnoreCase))
throw new CalendarException(String.Format("Expected 'END:{0}' not '{1}'.", Component.Names.TimeZone, content));
return;
case "tzid": Id = content.Value; break;
case "last-modified": ModifiedOn = content.ToDate(); break;
case "url": Uri = content.Value; break;
}
}
throw new CalendarException("Unexpected end of file.");
}
/// <summary>
/// Creates a <see cref="VTimeZone"/> from a <see cref="TimeZoneInfo"/> object.
/// </summary>
/// <param name="tzi">
/// The <see cref="TimeZoneInfo"/> to convert.
/// </param>
/// <returns>
/// A <see cref="VTimeZone"/> representing the <paramref name="tzi"/>.
/// </returns>
/// <example>
/// The following snippet demonstrates how to create an instance of the <see cref="VTimeZone"/> class for the
/// local time zone.
/// <code>
/// var localTimeZone = VTimeZone.FromTimeZoneInfo(TimeZoneInfo.Local);
/// </code>
/// </example>
/// <seealso cref="VCalendar.ForLocalTimeZone"/>
public static VTimeZone FromTimeZoneInfo(TimeZoneInfo tzi)
{
Guard.IsNotNull(tzi, "tzi");
var tz = new VTimeZone { Id = tzi.DisplayName };
// Simple case of no adjustments.
if (!tzi.SupportsDaylightSavingTime)
{
tz.Adjustments.Add(new StandardChange
{
StartsOn = new DateTime(0, DateTimeKind.Local),
Name = new Text(CultureInfo.CurrentCulture.Name, tzi.StandardName),
OffsetFrom = tzi.BaseUtcOffset,
OffsetTo = tzi.BaseUtcOffset
});
return tz;
}
// Convert TZI adjustments. Each adjustment is DaylightChange.
// TODO: Need to synthesize the StandardChange.
// TODO: Rewrite when RecurrenceRule is functional.
foreach (var adjustment in tzi.GetAdjustmentRules())
{
var daylight = new DaylightChange
{
Name = new Text(CultureInfo.CurrentCulture.Name, tzi.DaylightName),
StartsOn = adjustment.DateStart + adjustment.DaylightTransitionStart.TimeOfDay.TimeOfDay,
OffsetFrom = tzi.BaseUtcOffset,
OffsetTo = tzi.BaseUtcOffset + adjustment.DaylightDelta,
};
if (adjustment.DaylightTransitionStart.IsFixedDateRule)
{
throw new NotImplementedException("TimeZoneInfo with fixed date rule.");
}
else
{
var s = new StringBuilder("FREQ=YEARLY;WKST=MO");
s.AppendFormat(";BYMONTH={0}", adjustment.DaylightTransitionStart.Month);
s.AppendFormat(";Day={0}{1}",
adjustment.DaylightTransitionStart.Week == 5 ? -1 : adjustment.DaylightTransitionStart.Week,
adjustment.DaylightTransitionStart.DayOfWeek.ToRfc5545WeekDayName());
daylight.RecurrenceRule = RecurrenceRule.Parse(s.ToString());
}
tz.Adjustments.Add(daylight);
}
return tz;
}
