private ScheduleStatus ProbeSchedule(XPathNavigator document, XPathNavigator exceptionsDocument, ScheduleStatus schedule, ScheduleStatus exceptionsSchedule)
{
ScheduleStatus testSched = new ScheduleStatus();
ScheduleStatus testExceptionSched = new ScheduleStatus();
DateTime nextDate = DateTime.Now;
bool initialState = schedule.Success;
for (int probeCount = 0; (probeCount <= 30); probeCount++)
{
nextDate = nextDate.AddSeconds(1);
// reset variables
testSched.Success = false;
testSched.Expired = false;
document.MoveToRoot();
document.MoveToFirstChild();
if (exceptionsDocument != null)
{
exceptionsDocument.MoveToRoot();
exceptionsDocument.MoveToFirstChild();
testExceptionSched.Success = false;
testExceptionSched.Expired = false;
}
bool valid = (CheckNode(document, nextDate, ref testSched) && ((exceptionsDocument == null) || !(CheckNode(exceptionsDocument, nextDate, ref testExceptionSched))));
if (valid != initialState)
{
return(schedule);
}
schedule.NextTestDate = nextDate;
}
return(schedule);
}
/// Check an XML schedule with exceptions.
public virtual ScheduleStatus CheckSchedule(Stream schedule, Stream exceptions)
{
ScheduleStatus sched = new ScheduleStatus();
sched.Precision = String.Empty;
ScheduleStatus xSched = new ScheduleStatus();
xSched.Precision = String.Empty;
XPathNavigator nav = null;
XPathNavigator xNav = null;
if ((schedule == null) || schedule.Equals(Stream.Null))
{
sched.Success = true;
}
else
{
XPathDocument doc = new XPathDocument(schedule);
nav = doc.CreateNavigator();
if (!(nav.MoveToChild(XPathNodeType.Element)) || nav.Name != "schedule")
{
sched.Success = true;
}
else
{
CheckNode(nav, DateTime.Now, ref sched);
}
}
if ((exceptions != null) && !(exceptions.Equals(Stream.Null)))
{
XPathDocument xDoc = new XPathDocument(exceptions);
xNav = xDoc.CreateNavigator();
if (!(xNav.MoveToChild(XPathNodeType.Element)) || xNav.Name != "schedule")
{
xSched.Success = true;
}
else
{
CheckNode(xNav, DateTime.Now, ref xSched);
}
}
if (xSched.Success)
{
sched.Success = false;
}
if (UsePreciseProbe)
{
sched = ProbeScheduleExact(nav, xNav, sched, xSched);
}
else
{
sched = ProbeSchedule(nav, xNav, sched, xSched);
}
return(sched);
}
/// Check if a free form text schedule with exceptions is valid on the testDate.
public static ScheduleStatus Test(string schedule, string exceptions, DateTime testDate)
{
Scheduler s = new Scheduler();
s.TestDate = testDate;
ScheduleStatus status = s.CheckSchedule(schedule, exceptions);
status.Schedule = schedule;
status.Exceptions = exceptions;
return(status);
}
private ScheduleStatus ProbeScheduleExact(XPathNavigator document, XPathNavigator exceptionsDocument, ScheduleStatus schedule, ScheduleStatus exceptionsSchedule)
{
ScheduleStatus testSched = new ScheduleStatus();
ScheduleStatus testExceptionSched = new ScheduleStatus();
int sign = 1;
DateTime nextDate = DateTime.Now;
bool initialState = schedule.Success;
int jump = 0;
if (schedule.Precision.Equals("daily") || exceptionsSchedule.Precision.Equals("daily"))
{
jump = (6 * 60);
}
else
if (schedule.Precision.Equals("weekly") || exceptionsSchedule.Precision.Equals("weekly"))
{
jump = (72 * 60);
}
else
if (schedule.Precision.Equals("monthly") || exceptionsSchedule.Precision.Equals("monthly"))
{
jump = (360 * 60);
}
else
if (schedule.Precision.Equals("yearly") || exceptionsSchedule.Precision.Equals("yearly"))
{
jump = ((720 * 6)
* 60);
}
else
{
jump = (6 * 60);
}
for (int probeCount = 1; (probeCount <= 20); probeCount++)
{
// reset variables
testSched.Success = false;
testSched.Expired = false;
document.MoveToRoot();
document.MoveToFirstChild();
if (exceptionsDocument != null)
{
exceptionsDocument.MoveToRoot();
exceptionsDocument.MoveToFirstChild();
testExceptionSched.Success = false;
testExceptionSched.Expired = false;
}
// set next date to check
nextDate = nextDate.AddMinutes((jump * sign));
bool valid = (CheckNode(document, nextDate, ref testSched) && ((exceptionsDocument == null) || !(CheckNode(exceptionsDocument, nextDate, ref testExceptionSched))));
if (valid == initialState)
{
sign = 1;
}
else
{
sign = -1;
}
// keep moving forward and expand jump if no border found, otherwise narrow jump
if (sign == -1)
{
jump = (jump / 2);
}
else
{
jump = (jump * 2);
probeCount--;
}
if (jump < 5)
{
jump++;
}
// no border found
if (nextDate > DateTime.Now.AddYears(5))
{
break;
}
}
schedule.NextTestDate = nextDate.AddMinutes((jump * -1));
return(schedule);
}
/// Checks the current navigator if the current nodes define an active schedule. An empty schedule will set Match to true.
private bool CheckNode(XPathNavigator nav, DateTime checkDate, ref ScheduleStatus sched)
{
if (nav == null)
{
return(false);
}
sched.Precision = nav.Name;
if (!(nav.MoveToFirstChild()))
{
// no schedule limitation
sched.Success = true;
return(true);
}
while (true)
{
// ignore comments
if (!(nav.NodeType.Equals(XPathNodeType.Comment)))
{
string name = nav.Name;
if (name == "once")
{
if (CheckInterval(nav, checkDate))
{
sched.Success = true;
}
}
else
if (CheckInterval(nav, checkDate))
{
string value = nav.GetAttribute("value", String.Empty);
string every = nav.GetAttribute("every", String.Empty);
int check = 0;
if (name == "yearly")
{
check = checkDate.Year;
}
else
if (name == "monthly")
{
check = checkDate.Month;
}
else
if (name == "weekly")
{
check = GetWeekOfMonth(checkDate);
}
else
if (name == "daily")
{
check = ((int)(checkDate.DayOfWeek));
}
if (CheckNumberInterval(value, check, every))
{
CheckNode(nav, checkDate, ref sched);
}
}
// found a match
if (sched.Expired || sched.Success)
{
break;
}
}
// no more nodes
if (!(nav.MoveToNext()))
{
break;
}
}
return(sched.Success);
}