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Add a function to tell us if an event overlaps a date range.

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This commit is contained in:
Andrew McMillan 2009-04-18 10:42:49 +12:00
parent cd828f3e73
commit 265ec4f134
1 changed files with 53 additions and 1 deletions
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54
dba/rrule_functions.sql
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@ -534,10 +534,18 @@ BEGIN
loopcount := 0;
SELECT * INTO rrule FROM parse_rrule_parts( basedate, repeatrule );
IF rrule.count IS NOT NULL THEN
loopmax := rrule.count;
ELSE
loopmax := max_count;
-- max_count is pretty arbitrary, so we scale it somewhat here depending on the frequency.
IF rrule.freq = 'DAILY' THEN
loopmax := max_count * 20;
ELSIF rrule.freq = 'WEEKLY' THEN
loopmax := max_count * 3;
ELSE
loopmax := max_count;
END IF;
END IF;
current_base := basedate;
@ -619,3 +627,47 @@ BEGIN
RETURN QUERY SELECT d FROM rrule_event_instances_range( basedate, repeatrule, basedate, maxdate, 300 ) d;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE STRICT;
------------------------------------------------------------------------------------------------------
-- In most cases we just want to know if there *is* an event overlapping the range, so we have a
-- specific function for that. Note that this is *not* strict, and can be called with NULLs.
------------------------------------------------------------------------------------------------------
CREATE or REPLACE FUNCTION rrule_event_overlaps( TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH TIME ZONE, TEXT, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH TIME ZONE )
RETURNS BOOLEAN AS $$
DECLARE
dtstart ALIAS FOR $1;
dtend ALIAS FOR $2;
repeatrule ALIAS FOR $3;
in_mindate ALIAS FOR $4;
in_maxdate ALIAS FOR $5;
mindate TIMESTAMP WITH TIME ZONE;
maxdate TIMESTAMP WITH TIME ZONE;
BEGIN
IF dtstart IS NULL OR dtend IS NULL THEN
RETURN NULL;
END IF;
IF in_mindate IS NULL THEN
mindate := current_date - '10 years'::interval;
ELSE
mindate := in_mindate;
END IF;
IF in_maxdate IS NULL THEN
maxdate := current_date + '10 years'::interval;
ELSE
-- If we add the duration onto the event, then an overlap occurs if dtend <= increased end of range.
maxdate := in_maxdate + (dtend - dtstart);
END IF;
IF repeatrule IS NULL THEN
RETURN (dtstart <= maxdate AND dtend >= mindate);
END IF;
SELECT d INTO mindate FROM rrule_event_instances_range( dtend, repeatrule, mindate, maxdate, 3 ) d LIMIT 1;
RETURN FOUND;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;