/// <summary>
/// Retrieves the recurrence, after applying the specified name format.
/// </summary>
/// <remarks>
/// Multiple zones may apply the same set of rules as to when they change into/out of
/// daylight saving time, but with different names.
/// </remarks>
/// <param name="zone">The zone for which this rule is being considered.</param>
public IEnumerable <ZoneRecurrence> GetRecurrences(ZoneLine zone)
{
string name = zone.FormatName(recurrence.Savings, daylightSavingsIndicator);
if (Type == null)
{
yield return(recurrence.WithName(name));
}
else
{
Predicate <int> yearPredicate = GetYearPredicate();
// Apply a little sanity...
if (recurrence.IsInfinite || recurrence.ToYear - recurrence.FromYear > 1000)
{
throw new NotSupportedException("Noda Time does not support 'typed' rules over large periods");
}
for (int year = recurrence.FromYear; year <= recurrence.ToYear; year++)
{
if (yearPredicate(year))
{
yield return(recurrence.ForSingleYear(year).WithName(name));
}
}
}
}
private string FormatName(ZoneLine zone)
{
string nameFormat = zone.Format;
int index = nameFormat.IndexOf("/", StringComparison.Ordinal);
if (index > 0)
{
return(recurrence.Savings == Offset.Zero ? nameFormat.Substring(0, index) : nameFormat.Substring(index + 1));
}
index = nameFormat.IndexOf("%s", StringComparison.Ordinal);
if (index >= 0)
{
var left = nameFormat.Substring(0, index);
var right = nameFormat.Substring(index + 2);
return(left + daylightSavingsIndicator + right);
}
index = nameFormat.IndexOf("%z", StringComparison.Ordinal);
if (index >= 0)
{
var wallOffset = zone.StandardOffset + recurrence.Savings;
var left = nameFormat.Substring(0, index);
var right = nameFormat.Substring(index + 2);
return(left + PercentZPattern.Format(wallOffset) + right);
}
return(nameFormat);
}
/// <summary>
/// Adds the given zone line to the database, creating a new list for
/// that zone ID if necessary.
/// </summary>
/// <param name="zone">The zone to add.</param>
internal void AddZone(ZoneLine zone)
{
if (!Zones.TryGetValue(zone.Name, out var zoneSet))
{
zoneSet = new List <ZoneLine>();
Zones[zone.Name] = zoneSet;
}
zoneSet.Add(zone);
}
