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/* Evolution calendar - Utilities for manipulating CalComponent objects
*
* Copyright (C) 2000 Ximian, Inc.
* Copyright (C) 2000 Ximian, Inc.
*
* Author: Federico Mena-Quintero <federico@ximian.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "comp-util.h"
/**
* cal_comp_util_add_exdate:
* @comp: A calendar component object.
* @itt: Time for the exception.
*
* Adds an exception date to the current list of EXDATE properties in a calendar
* component object.
**/
void
cal_comp_util_add_exdate (CalComponent *comp, time_t t, icaltimezone *zone)
{
GSList *list;
CalComponentDateTime *cdt;
g_return_if_fail (comp != NULL);
g_return_if_fail (IS_CAL_COMPONENT (comp));
cal_component_get_exdate_list (comp, &list);
cdt = g_new (CalComponentDateTime, 1);
cdt->value = g_new (struct icaltimetype, 1);
*cdt->value = icaltime_from_timet_with_zone (t, FALSE, zone);
cdt->tzid = g_strdup (icaltimezone_get_tzid (zone));
list = g_slist_append (list, cdt);
cal_component_set_exdate_list (comp, list);
cal_component_free_exdate_list (list);
}
/* Returns TRUE if the TZIDs are equivalent, i.e. both NULL or the same. */
static gboolean
cal_component_compare_tzid (const char *tzid1, const char *tzid2)
{
gboolean retval = TRUE;
if (tzid1) {
if (!tzid2 || strcmp (tzid1, tzid2))
retval = FALSE;
} else {
if (tzid2)
retval = FALSE;
}
return retval;
}
/**
* cal_comp_util_compare_event_timezones:
* @comp: A calendar component object.
* @client: A #CalClient.
*
* Checks if the component uses the given timezone for both the start and
* the end time, or if the UTC offsets of the start and end times are the same
* as in the given zone.
*
* Returns: TRUE if the component's start and end time are at the same UTC
* offset in the given timezone.
**/
gboolean
cal_comp_util_compare_event_timezones (CalComponent *comp,
CalClient *client,
icaltimezone *zone)
{
CalClientGetStatus status;
CalComponentDateTime start_datetime, end_datetime;
const char *tzid;
gboolean retval = FALSE;
icaltimezone *start_zone, *end_zone;
int offset1, offset2;
tzid = icaltimezone_get_tzid (zone);
cal_component_get_dtstart (comp, &start_datetime);
cal_component_get_dtend (comp, &end_datetime);
/* If either the DTSTART or the DTEND is a DATE value, we return TRUE.
Maybe if one was a DATE-TIME we should check that, but that should
not happen often. */
if (start_datetime.value->is_date || end_datetime.value->is_date) {
retval = TRUE;
goto out;
}
/* FIXME: DURATION may be used instead. */
if (cal_component_compare_tzid (tzid, start_datetime.tzid)
&& cal_component_compare_tzid (tzid, end_datetime.tzid)) {
/* If both TZIDs are the same as the given zone's TZID, then
we know the timezones are the same so we return TRUE. */
retval = TRUE;
} else {
/* If the TZIDs differ, we have to compare the UTC offsets
of the start and end times, using their own timezones and
the given timezone. */
status = cal_client_get_timezone (client,
start_datetime.tzid,
&start_zone);
if (status != CAL_CLIENT_GET_SUCCESS)
goto out;
offset1 = icaltimezone_get_utc_offset (start_zone,
start_datetime.value,
NULL);
offset2 = icaltimezone_get_utc_offset (zone,
start_datetime.value,
NULL);
if (offset1 == offset2) {
status = cal_client_get_timezone (client,
end_datetime.tzid,
&end_zone);
if (status != CAL_CLIENT_GET_SUCCESS)
goto out;
offset1 = icaltimezone_get_utc_offset (end_zone,
end_datetime.value,
NULL);
offset2 = icaltimezone_get_utc_offset (zone,
end_datetime.value,
NULL);
if (offset1 == offset2)
retval = TRUE;
}
}
out:
cal_component_free_datetime (&start_datetime);
cal_component_free_datetime (&end_datetime);
return retval;
}
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