/// <summary>
/// Apply the time-filter to the VEVENT components.
/// A VEVENT component overlaps a given time range if the condition for the
/// corresponding component state specified in the table (pg64 RFC 4791) is satisfied.
/// </summary>
/// <param name="component">THe VTODO</param>
/// <param name="start">The start time of the filter</param>
/// <param name="end">The end datetime of the filter</param>
/// <param name="expandedDates">The expaned dts by the RRULEs if any.</param>
/// <returns>True if pass the filter, false otherwise.</returns>
private static bool ApplyTimeFilterToVEVENT(this ICalendarComponent component, DateTime start, DateTime end,
IEnumerable <DateTime> expandedDates)
{
var compEndTimeProp = component.GetComponentProperty("DTEND");
foreach (var DTSTART in expandedDates)
{
//VEVENT has the DTEND property? Y
// VEVENT has the DURATION property? N
// DURATION property value is greater than 0 seconds? N
// DTSTART property is a DATE-TIME value? *
if (compEndTimeProp != null)
{
var DTEND = ((IValue <DateTime>)compEndTimeProp).Value;
if (start < DTEND && end > DTSTART)
{
return(true);
}
}
var durationProp = component.GetComponentProperty("DURATION");
//VEVENT has the DTEND property? N
// VEVENT has the DURATION property? Y
if (durationProp != null)
{
var DURATION = ((IValue <DurationType>)durationProp).Value;
var DTSTARTplusDURATION = DTSTART.AddDuration(DURATION);
// DURATION property value is greater than 0 seconds? Y
// DTSTART property is a DATE-TIME value? *
if (DURATION.IsPositive)
{
if (start < DTSTARTplusDURATION && end > DTSTART)
{
return(true);
}
}
// DURATION property value is greater than 0 seconds? N
// DTSTART property is a DATE-TIME value? *
else
{
if (start <= DTSTART && end > DTSTART)
{
return(true);
}
}
}
//VEVENT has the DTEND property? N
// VEVENT has the DURATION property? N
// DURATION property value is greater than 0 seconds? N
// DTSTART property is a DATE-TIME value? Y
if (start <= DTSTART && end > DTSTART)
{
return(true);
}
//VEVENT has the DTEND property? N
// VEVENT has the DURATION property? N
// DURATION property value is greater than 0 seconds? N
// DTSTART property is a DATE-TIME value? N
if (start < DTSTART.AddDays(1) && end > DTSTART)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Apply the time-filter to the VTODOs components.
/// A VTODO component overlaps a given time range if the condition for the
/// corresponding component state specified in the table (pg64 RFC 4791) is satisfied.
/// </summary>
/// <param name="component">The VTODO</param>
/// <param name="start">The start time of the filter</param>
/// <param name="end">The end datetime of the filter</param>
/// <param name="expandedDates">The expaned dts by the RRULEs if any.</param>
/// <returns>True if pass the filter, false otherwise.</returns>
private static bool ApplyTimeFilterToVTODO(this ICalendarComponent component, DateTime start, DateTime end,
IEnumerable <DateTime> expandedDates)
{
var DURATION = component.GetComponentProperty("DURATION") == null
? null
: ((IValue <DurationType>)component.GetComponentProperty("DURATION")).Value;
var DUE = component.GetComponentProperty("DUE") == null
? null
: ((IValue <Due>)component.GetComponentProperty("DUE")).Value;
var COMPLETED = component.GetComponentProperty("COMPLETED") == null
? null
: ((IValue <Completed>)component.GetComponentProperty("COMPLETED")).Value;
var CREATED = component.GetComponentProperty("CREATED") == null
? null
: ((IValue <Created>)component.GetComponentProperty("Created")).Value;
//VTODO has the DTSTART property? Y
if (expandedDates.Any())
{
foreach (var DTSTART in expandedDates)
{
// VTODO has the DURATION property? Y
// VTODO has the DUE property? N
// VTODO has the COMPLETED property? *
// VTODO has the CREATED property? *
if (DURATION != null && DUE == null)
{
var DTSTARTplusDURATION = DTSTART.AddDuration(DURATION);
if (start <= DTSTARTplusDURATION &&
(end > DTSTART || end > DTSTARTplusDURATION))
{
return(true);
}
}
// VTODO has the DURATION property? N
// VTODO has the DUE property? Y
// VTODO has the COMPLETED property? *
// VTODO has the CREATED property? *
else if (DUE != null)
{
if ((start < DUE.Value || start <= DTSTART) &&
(end > DTSTART) || end >= DUE.Value)
{
return(true);
}
}
// VTODO has the DURATION property? N
// VTODO has the DUE property? N
// VTODO has the COMPLETED property? *
// VTODO has the CREATED property? *
if (DUE == null && DURATION == null)
{
if (start <= DTSTART && end > DTSTART)
{
return(true);
}
}
}
}
//VTODO has the DTSTART property? N
else
{
// VTODO has the DURATION property? N
// VTODO has the DUE property? Y
// VTODO has the COMPLETED property? *
// VTODO has the CREATED property? *
if (DUE != null && DURATION == null)
{
if (start < DUE.Value && end >= DUE.Value)
{
return(true);
}
}
// VTODO has the DURATION property? N
// VTODO has the DUE property? N
// VTODO has the COMPLETED property? Y
// VTODO has the CREATED property? Y
if (COMPLETED != null && CREATED != null)
{
if ((start <= CREATED.Value || start <= COMPLETED.Value) &&
end >= CREATED.Value || end >= COMPLETED.Value)
{
return(true);
}
}
// VTODO has the DURATION property? N
// VTODO has the DUE property? N
// VTODO has the COMPLETED property? Y
// VTODO has the CREATED property? N
else if (COMPLETED != null && CREATED == null)
{
if (start <= COMPLETED.Value && end >= COMPLETED.Value)
{
return(true);
}
}
// VTODO has the DURATION property? N
// VTODO has the DUE property? N
// VTODO has the COMPLETED property? N
// VTODO has the CREATED property? Y
else if (COMPLETED == null && CREATED != null)
{
if (end > CREATED.Value)
{
return(true);
}
}
}
// VTODO has the DURATION property? N
// VTODO has the DUE property? N
// VTODO has the COMPLETED property? N
// VTODO has the CREATED property? N
return(true);
}
