/*
* Get the transition time in local wall clock
*/
private static long GetTransitionTime(TimeZoneTransition tzt,
bool local, int NonExistingTimeOpt, int DuplicatedTimeOpt)
{
long time = tzt.GetTime();
if (local)
{
time += GetLocalDelta(tzt.GetFrom().GetRawOffset(), tzt.GetFrom()
.GetDSTSavings(), tzt.GetTo().GetRawOffset(), tzt.GetTo()
.GetDSTSavings(), NonExistingTimeOpt, DuplicatedTimeOpt);
}
return(time);
}
// /CLOVER:ON
/// <summary>
///
/// </summary>
///
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public override bool UseDaylightTime()
{
// Note: This implementation returns true when
// daylight saving time is used as of now or
// after the next transition.
long now = DateTime.Now.Millisecond;
int[] offsets = new int[2];
GetOffset(now, false, offsets);
if (offsets[1] != 0)
{
return(true);
}
// If DST is not used now, check if DST is used after the next
// transition
TimeZoneTransition tt = GetNextTransition(now, false);
if (tt != null && tt.GetTo().GetDSTSavings() != 0)
{
return(true);
}
return(false);
}
/// <summary>
/// Gets the array of <c>TimeZoneRule</c> which represents the rule of
/// this time zone object near the specified date. Some applications are not
/// capable to handle historic time zone rule changes. Also some applications
/// can only handle certain type of rule definitions. This method returns
/// either a single <c>InitialTimeZoneRule</c> if this time zone does
/// not have any daylight saving time within 1 year from the specified time,
/// or a pair of <c>AnnualTimeZoneRule</c> whose rule type is
/// <c>DateTimeRule.DOW</c> for date and
/// <c>DateTimeRule.WALL_TIME</c> for time with a single
/// <c>InitialTimeZoneRule</c> representing the initial time, when this
/// time zone observes daylight saving time near the specified date. Thus,
/// the result may be only valid for dates around the specified date.
/// </summary>
///
/// <param name="date">The date to be used for <c>TimeZoneRule</c> extraction.</param>
/// <returns>The array of <c>TimeZoneRule</c>, either a single
/// <c>InitialTimeZoneRule</c> object, or a pair of
/// <c>AnnualTimeZoneRule</c> with a single
/// <c>InitialTimeZoneRule</c>. The first element in the array
/// is always a <c>InitialTimeZoneRule</c>.</returns>
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public TimeZoneRule[] GetSimpleTimeZoneRulesNear(long date)
{
AnnualTimeZoneRule[] annualRules = null;
TimeZoneRule initialRule = null;
// Get the next transition
TimeZoneTransition tr = GetNextTransition(date, false);
if (tr != null)
{
String initialName = tr.GetFrom().GetName();
int initialRaw = tr.GetFrom().GetRawOffset();
int initialDst = tr.GetFrom().GetDSTSavings();
// Check if the next transition is either DST->STD or STD->DST and
// within roughly 1 year from the specified date
long nextTransitionTime = tr.GetTime();
if (((tr.GetFrom().GetDSTSavings() == 0 && tr.GetTo()
.GetDSTSavings() != 0) || (tr.GetFrom().GetDSTSavings() != 0 && tr
.GetTo().GetDSTSavings() == 0)) &&
date + MILLIS_PER_YEAR > nextTransitionTime)
{
// Get the next next transition
annualRules = new AnnualTimeZoneRule[2];
int[] dtfields = IBM.ICU.Impl.Grego.TimeToFields(
nextTransitionTime + tr.GetFrom().GetRawOffset()
+ tr.GetFrom().GetDSTSavings(), null);
int weekInMonth = IBM.ICU.Impl.Grego.GetDayOfWeekInMonth(dtfields[0],
dtfields[1], dtfields[2]);
// Create DOW rule
DateTimeRule dtr = new DateTimeRule(dtfields[1], weekInMonth,
dtfields[3], dtfields[5], IBM.ICU.Util.DateTimeRule.WALL_TIME);
annualRules[0] = new AnnualTimeZoneRule(tr.GetTo().GetName(),
tr.GetTo().GetRawOffset(), tr.GetTo().GetDSTSavings(),
dtr, dtfields[0], IBM.ICU.Util.AnnualTimeZoneRule.MAX_YEAR);
tr = GetNextTransition(nextTransitionTime, false);
AnnualTimeZoneRule secondRule = null;
if (tr != null)
{
// Check if the next next transition is either DST->STD or
// STD->DST
// and within roughly 1 year from the next transition
if (((tr.GetFrom().GetDSTSavings() == 0 && tr.GetTo()
.GetDSTSavings() != 0) || (tr.GetFrom()
.GetDSTSavings() != 0 && tr.GetTo().GetDSTSavings() == 0)) &&
nextTransitionTime + MILLIS_PER_YEAR > tr
.GetTime())
{
// Generate another DOW rule
dtfields = IBM.ICU.Impl.Grego.TimeToFields(tr.GetTime()
+ tr.GetFrom().GetRawOffset()
+ tr.GetFrom().GetDSTSavings(), dtfields);
weekInMonth = IBM.ICU.Impl.Grego.GetDayOfWeekInMonth(dtfields[0],
dtfields[1], dtfields[2]);
dtr = new DateTimeRule(dtfields[1], weekInMonth,
dtfields[3], dtfields[5],
IBM.ICU.Util.DateTimeRule.WALL_TIME);
secondRule = new AnnualTimeZoneRule(tr.GetTo()
.GetName(), tr.GetTo().GetRawOffset(), tr
.GetTo().GetDSTSavings(), dtr, dtfields[0] - 1,
IBM.ICU.Util.AnnualTimeZoneRule.MAX_YEAR);
// Make sure this rule can be applied to the specified
// date
DateTime d = secondRule.GetPreviousStart(date, tr.GetFrom()
.GetRawOffset(), tr.GetFrom().GetDSTSavings(),
true);
if (d != null && (d.Ticks / 10000) <= date &&
initialRaw == tr.GetTo().GetRawOffset() &&
initialDst == tr.GetTo().GetDSTSavings())
{
// We can use this rule as the second transition
// rule
annualRules[1] = secondRule;
}
}
}
if (annualRules[1] == null)
{
// Try previous transition
tr = GetPreviousTransition(date, true);
if (tr != null)
{
// Check if the previous transition is either DST->STD
// or STD->DST.
// The actual transition time does not matter here.
if ((tr.GetFrom().GetDSTSavings() == 0 && tr.GetTo()
.GetDSTSavings() != 0) ||
(tr.GetFrom().GetDSTSavings() != 0 && tr
.GetTo().GetDSTSavings() == 0))
{
// Generate another DOW rule
dtfields = IBM.ICU.Impl.Grego.TimeToFields(tr.GetTime()
+ tr.GetFrom().GetRawOffset()
+ tr.GetFrom().GetDSTSavings(), dtfields);
weekInMonth = IBM.ICU.Impl.Grego.GetDayOfWeekInMonth(
dtfields[0], dtfields[1], dtfields[2]);
dtr = new DateTimeRule(dtfields[1], weekInMonth,
dtfields[3], dtfields[5],
IBM.ICU.Util.DateTimeRule.WALL_TIME);
secondRule = new AnnualTimeZoneRule(tr.GetTo()
.GetName(), tr.GetTo().GetRawOffset(), tr
.GetTo().GetDSTSavings(), dtr,
annualRules[0].GetStartYear() - 1,
IBM.ICU.Util.AnnualTimeZoneRule.MAX_YEAR);
// Check if this rule start after the first rule
// after the specified date
DateTime d_0 = secondRule.GetNextStart(date, tr.GetFrom()
.GetRawOffset(), tr.GetFrom()
.GetDSTSavings(), false);
if ((d_0.Ticks / 10000) > nextTransitionTime)
{
// We can use this rule as the second transition
// rule
annualRules[1] = secondRule;
}
}
}
}
if (annualRules[1] == null)
{
// Cannot generate a good pair of AnnualTimeZoneRule
annualRules = null;
}
else
{
// The initial rule should represent the rule before the
// previous transition
initialName = annualRules[0].GetName();
initialRaw = annualRules[0].GetRawOffset();
initialDst = annualRules[0].GetDSTSavings();
}
}
initialRule = new InitialTimeZoneRule(initialName, initialRaw,
initialDst);
}
else
{
// Try the previous one
tr = GetPreviousTransition(date, true);
if (tr != null)
{
initialRule = new InitialTimeZoneRule(tr.GetTo().GetName(), tr
.GetTo().GetRawOffset(), tr.GetTo().GetDSTSavings());
}
else
{
// No transitions in the past. Just use the current offsets
int[] offsets = new int[2];
GetOffset(date, false, offsets);
initialRule = new InitialTimeZoneRule(GetID(), offsets[0],
offsets[1]);
}
}
TimeZoneRule[] result = null;
if (annualRules == null)
{
result = new TimeZoneRule[1];
result[0] = initialRule;
}
else
{
result = new TimeZoneRule[3];
result[0] = initialRule;
result[1] = annualRules[0];
result[2] = annualRules[1];
}
return(result);
}
/// <summary>
/// Gets the array of <c>TimeZoneRule</c> which represents the rule of
/// this time zone object since the specified start time. The first element
/// in the result array will be the <c>InitialTimeZoneRule</c> instance
/// for the initial rule. The rest will be either
/// <c>AnnualTimeZoneRule</c> or <c>TimeArrayTimeZoneRule</c>
/// instances representing transitions.
/// </summary>
///
/// <param name="start">The start time (inclusive).</param>
/// <returns>The array of <c>TimeZoneRule</c> which represents this time
/// zone since the start time.</returns>
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public virtual TimeZoneRule[] GetTimeZoneRules(long start)
{
TimeZoneRule[] all = GetTimeZoneRules();
TimeZoneTransition tzt = GetPreviousTransition(start, true);
if (tzt == null)
{
// No need to filter out rules only applicable to time before the
// start
return(all);
}
BitSet isProcessed = new BitSet(all.Length);
IList filteredRules = new LinkedList();
// Create initial rule
TimeZoneRule initial = new InitialTimeZoneRule(tzt.GetTo().GetName(),
tzt.GetTo().GetRawOffset(), tzt.GetTo().GetDSTSavings());
ILOG.J2CsMapping.Collections.Generics.Collections.Add(filteredRules, initial);
isProcessed.Set(0);
// Mark rules which does not need to be processed
for (int i = 1; i < all.Length; i++)
{
DateTime d = all[i].GetNextStart(start, initial.GetRawOffset(),
initial.GetDSTSavings(), false);
if (d == null)
{
isProcessed.Set(i);
}
}
long time = start;
bool bFinalStd = false, bFinalDst = false;
while (!bFinalStd || !bFinalDst)
{
tzt = GetNextTransition(time, false);
if (tzt == null)
{
break;
}
time = tzt.GetTime();
TimeZoneRule toRule = tzt.GetTo();
int ruleIdx = 1;
for (; ruleIdx < all.Length; ruleIdx++)
{
if (all[ruleIdx].Equals(toRule))
{
break;
}
}
if (ruleIdx >= all.Length)
{
throw new InvalidOperationException("The rule was not found");
}
if (isProcessed.Get(ruleIdx))
{
continue;
}
if (toRule is TimeArrayTimeZoneRule)
{
TimeArrayTimeZoneRule tar = (TimeArrayTimeZoneRule)toRule;
// Get the previous raw offset and DST savings before the very
// first start time
long t = start;
while (true)
{
tzt = GetNextTransition(t, false);
if (tzt == null)
{
break;
}
if (tzt.GetTo().Equals(tar))
{
break;
}
t = tzt.GetTime();
}
if (tzt != null)
{
// Check if the entire start times to be added
DateTime firstStart = tar.GetFirstStart(tzt.GetFrom()
.GetRawOffset(), tzt.GetFrom().GetDSTSavings());
if ((firstStart.Ticks / 10000) > start)
{
// Just add the rule as is
ILOG.J2CsMapping.Collections.Generics.Collections.Add(filteredRules, tar);
}
else
{
// Collect transitions after the start time
long[] times = tar.GetStartTimes();
int timeType = tar.GetTimeType();
int idx;
for (idx = 0; idx < times.Length; idx++)
{
t = times[idx];
if (timeType == IBM.ICU.Util.DateTimeRule.STANDARD_TIME)
{
t -= tzt.GetFrom().GetRawOffset();
}
if (timeType == IBM.ICU.Util.DateTimeRule.WALL_TIME)
{
t -= tzt.GetFrom().GetDSTSavings();
}
if (t > start)
{
break;
}
}
int asize = times.Length - idx;
if (asize > 0)
{
long[] newtimes = new long[asize];
System.Array.Copy((Array)(times), idx, (Array)(newtimes), 0, asize);
TimeArrayTimeZoneRule newtar = new TimeArrayTimeZoneRule(
tar.GetName(), tar.GetRawOffset(),
tar.GetDSTSavings(), newtimes,
tar.GetTimeType());
ILOG.J2CsMapping.Collections.Generics.Collections.Add(filteredRules, newtar);
}
}
}
}
else if (toRule is AnnualTimeZoneRule)
{
AnnualTimeZoneRule ar = (AnnualTimeZoneRule)toRule;
DateTime firstStart_0 = ar.GetFirstStart(
tzt.GetFrom().GetRawOffset(), tzt.GetFrom()
.GetDSTSavings());
if ((firstStart_0.Ticks / 10000) == tzt.GetTime())
{
// Just add the rule as is
ILOG.J2CsMapping.Collections.Generics.Collections.Add(filteredRules, ar);
}
else
{
// Calculate the transition year
int[] dfields = new int[6];
IBM.ICU.Impl.Grego.TimeToFields(tzt.GetTime(), dfields);
// Recreate the rule
AnnualTimeZoneRule newar = new AnnualTimeZoneRule(
ar.GetName(), ar.GetRawOffset(),
ar.GetDSTSavings(), ar.GetRule(), dfields[0],
ar.GetEndYear());
ILOG.J2CsMapping.Collections.Generics.Collections.Add(filteredRules, newar);
}
// Check if this is a final rule
if (ar.GetEndYear() == IBM.ICU.Util.AnnualTimeZoneRule.MAX_YEAR)
{
// After both final standard and dst rule are processed,
// exit this while loop.
if (ar.GetDSTSavings() == 0)
{
bFinalStd = true;
}
else
{
bFinalDst = true;
}
}
}
isProcessed.Set(ruleIdx);
}
TimeZoneRule[] rules = new TimeZoneRule[filteredRules.Count];
ILOG.J2CsMapping.Collections.Collections.ToArray(filteredRules, rules);
return(rules);
}
/// <summary>
/// Checks if the time zone has equivalent transitions in the time range.
/// This method returns true when all of transition times, from/to standard
/// offsets and DST savings used by this time zone match the other in the
/// time range.
/// </summary>
///
/// <param name="tz">The instance of <c>TimeZone</c></param>
/// <param name="start">The start time of the evaluated time range (inclusive)</param>
/// <param name="end">The end time of the evaluated time range (inclusive)</param>
/// <param name="ignoreDstAmount">When true, any transitions with only daylight saving amountchanges will be ignored, except either of them is zero. Forexample, a transition from rawoffset 3:00/dstsavings 1:00 torawoffset 2:00/dstsavings 2:00 is excluded from thecomparison, but a transtion from rawoffset 2:00/dstsavings1:00 to rawoffset 3:00/dstsavings 0:00 is included.</param>
/// <returns>true if the other time zone has the equivalent transitions in the
/// time range. When tz is not a <c>BasicTimeZone</c>, this
/// method returns false.</returns>
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public bool HasEquivalentTransitions(TimeZone tz, long start, long end,
bool ignoreDstAmount)
{
if (HasSameRules(tz))
{
return(true);
}
if (!(tz is BasicTimeZone))
{
return(false);
}
// Check the offsets at the start time
int[] offsets1 = new int[2];
int[] offsets2 = new int[2];
GetOffset(start, false, offsets1);
tz.GetOffset(start, false, offsets2);
if (ignoreDstAmount)
{
if ((offsets1[0] + offsets1[1] != offsets2[0] + offsets2[1]) ||
(offsets1[1] != 0 && offsets2[1] == 0) ||
(offsets1[1] == 0 && offsets2[1] != 0))
{
return(false);
}
}
else
{
if (offsets1[0] != offsets2[0] || offsets1[1] != offsets2[1])
{
return(false);
}
}
// Check transitions in the range
long time = start;
while (true)
{
TimeZoneTransition tr1 = GetNextTransition(time, false);
TimeZoneTransition tr2 = ((BasicTimeZone)tz).GetNextTransition(
time, false);
if (ignoreDstAmount)
{
// Skip a transition which only differ the amount of DST savings
if (tr1 != null &&
(tr1.GetFrom().GetRawOffset()
+ tr1.GetFrom().GetDSTSavings() == tr1.GetTo()
.GetRawOffset() + tr1.GetTo().GetDSTSavings()) &&
(tr1.GetFrom().GetDSTSavings() != 0 && tr1.GetTo()
.GetDSTSavings() != 0))
{
tr1 = GetNextTransition(tr1.GetTime(), false);
}
if (tr2 != null &&
(tr2.GetFrom().GetRawOffset()
+ tr2.GetFrom().GetDSTSavings() == tr2.GetTo()
.GetRawOffset() + tr2.GetTo().GetDSTSavings()) &&
(tr2.GetFrom().GetDSTSavings() != 0 && tr2.GetTo()
.GetDSTSavings() != 0))
{
tr2 = GetNextTransition(tr2.GetTime(), false);
}
}
bool inRange1 = false;
bool inRange2 = false;
if (tr1 != null)
{
if (tr1.GetTime() <= end)
{
inRange1 = true;
}
}
if (tr2 != null)
{
if (tr2.GetTime() <= end)
{
inRange2 = true;
}
}
if (!inRange1 && !inRange2)
{
// No more transition in the range
break;
}
if (!inRange1 || !inRange2)
{
return(false);
}
if (tr1.GetTime() != tr2.GetTime())
{
return(false);
}
if (ignoreDstAmount)
{
if (tr1.GetTo().GetRawOffset() + tr1.GetTo().GetDSTSavings() != tr2
.GetTo().GetRawOffset() + tr2.GetTo().GetDSTSavings() ||
tr1.GetTo().GetDSTSavings() != 0 &&
tr2.GetTo().GetDSTSavings() == 0 ||
tr1.GetTo().GetDSTSavings() == 0 &&
tr2.GetTo().GetDSTSavings() != 0)
{
return(false);
}
}
else
{
if (tr1.GetTo().GetRawOffset() != tr2.GetTo().GetRawOffset() ||
tr1.GetTo().GetDSTSavings() != tr2.GetTo()
.GetDSTSavings())
{
return(false);
}
}
time = tr1.GetTime();
}
return(true);
}
/// <summary>
///
/// </summary>
///
/// @draft ICU 3.8
/// @provisional This API might change or be removed in a future release.
public override TimeZoneTransition GetPreviousTransition(long bs, bool inclusive)
{
Complete();
if (historicTransitions == null)
{
return(null);
}
TimeZoneTransition result = null;
TimeZoneTransition tzt = (TimeZoneTransition)historicTransitions[0];
long tt = tzt.GetTime();
if (inclusive && tt == bs)
{
result = tzt;
}
else if (tt >= bs)
{
return(null);
}
else
{
int idx = historicTransitions.Count - 1;
tzt = (TimeZoneTransition)historicTransitions[idx];
tt = tzt.GetTime();
if (inclusive && tt == bs)
{
result = tzt;
}
else if (tt < bs)
{
if (finalRules != null)
{
// Find a transion time with finalRules
DateTime start0 = finalRules[0].GetPreviousStart(bs,
finalRules[1].GetRawOffset(),
finalRules[1].GetDSTSavings(), inclusive);
DateTime start1 = finalRules[1].GetPreviousStart(bs,
finalRules[0].GetRawOffset(),
finalRules[0].GetDSTSavings(), inclusive);
if (ILOG.J2CsMapping.Util.DateUtil.Before(start1, start0))
{
tzt = new TimeZoneTransition((start0.Ticks / 10000),
finalRules[1], finalRules[0]);
}
else
{
tzt = new TimeZoneTransition((start1.Ticks / 10000),
finalRules[0], finalRules[1]);
}
}
result = tzt;
}
else
{
// Find a transition within the historic transitions
idx--;
while (idx >= 0)
{
tzt = (TimeZoneTransition)historicTransitions[idx];
tt = tzt.GetTime();
if (tt < bs || (inclusive && tt == bs))
{
break;
}
idx--;
}
result = tzt;
}
}
if (result != null)
{
// For now, this implementation ignore transitions with only zone
// name changes.
TimeZoneRule from = result.GetFrom();
TimeZoneRule to = result.GetTo();
if (from.GetRawOffset() == to.GetRawOffset() &&
from.GetDSTSavings() == to.GetDSTSavings())
{
// No offset changes. Try previous one
result = GetPreviousTransition(result.GetTime(), false /*
* always
* exclusive
*/);
}
}
return(result);
}
