/// <summary>
/// Initializes a new instance of the <see cref="TzdbDatabase" /> class.
/// </summary>
internal TzdbDatabase(string version)
{
zoneLists = new SortedList <string, ZoneList>();
Rules = new Dictionary <string, IList <ZoneRule> >();
Aliases = new Dictionary <string, string>();
currentZoneList = null;
this.Version = version;
}
/// <summary>
/// Adds the given zone to the current zone list. If there is no zone list or the
/// zone is for a different named zone a new zone list is created.
/// </summary>
/// <param name="zone">The zone to add.</param>
internal void AddZone(Zone zone)
{
var name = zone.Name;
if (String.IsNullOrEmpty(name))
{
if (currentZoneList == null)
{
throw new InvalidOperationException("A continuation zone must be preceeded by an initially named zone");
}
name = currentZoneList.Name;
}
if (currentZoneList == null || currentZoneList.Name != name)
{
currentZoneList = new ZoneList();
zoneLists.Add(name, currentZoneList);
}
currentZoneList.Add(zone);
}
/// <summary>
/// Returns a newly created <see cref="DateTimeZone" /> built from the given time zone data.
/// </summary>
/// <param name="zoneList">The time zone definition parts to add.</param>
private DateTimeZone CreateTimeZone(ZoneList zoneList)
{
var builder = new DateTimeZoneBuilder();
foreach (Zone zone in zoneList)
{
builder.SetStandardOffset(zone.Offset);
if (zone.Rules == null)
{
builder.SetFixedSavings(zone.Format, Offset.Zero);
}
else
{
IList <ZoneRule> ruleSet;
if (Rules.TryGetValue(zone.Rules, out ruleSet))
{
AddRecurring(builder, zone.Format, ruleSet);
}
else
{
try
{
// Check if Rules actually just refers to a savings.
var savings = ParserHelper.ParseOffset(zone.Rules);
builder.SetFixedSavings(zone.Format, savings);
}
catch (FormatException)
{
throw new ArgumentException(
String.Format("Daylight savings rule name '{0}' for zone {1} is neither a known ruleset nor a fixed offset",
zone.Rules, zone.Name));
}
}
}
if (zone.UntilYear == Int32.MaxValue)
{
break;
}
builder.AddCutover(zone.UntilYear, zone.UntilYearOffset);
}
return(builder.ToDateTimeZone(zoneList.Name));
}
