Engine for live queries to calendars. A query object watches a CalBackend

2001-03-29  Federico Mena Quintero  <federico@ximian.com>

	Engine for live queries to calendars.  A query object watches a
	CalBackend in the PCS and is otherwise completely separate from
	it; backends need to do nothing to support live queries.  Right
	now we have the following functions:

		(get-vtype)

			Returns a string indicating the type of component
			(VEVENT, VTODO, VJOURNAL, VFREEBUSY, VTIMEZONE,
			UNKNOWN).

		(occur-in-time-range? START END)

			START - int, time_t start of the time range
			END - int, time_t end of the time range

			Returns a boolean indicating whether the component
			has any occurrences in the specified time range.

	* idl/evolution-calendar.idl (Cal::getQuery): New method that
	initiates a live query.
	(Query): New interface for a handle to a live query.
	(QueryListener): New interface for a listener to changes in a live
	query.

	* pcs/query.[ch]: New files with the live query engine.

	* pcs/cal-backend.h (CalBackendClass): Added notification signals
	so that the query system can catch them.
	(CalBackendClass): New virtual method ::get_load_state().

	* pcs/cal-backend.c (cal_backend_opened):
	(cal_backend_obj_updated):
	(cal_backend_obj_updated): New functions to emit the notification
	signals; to be used only by backend implementations.
	(cal_backend_get_load_state): New function.

	* pcs/cal-backend-file.c (notify_update): Call
	cal_backend_obj_updated().
	(notify_remove): Call call_backend_obj_removed().
	(open_cal): Free the icalcomp if it is not of the correct type.
	(cal_backend_file_get_load_state): Implemented new method.

	* pcs/cal-backend-db.c (cal_backend_db_update_object): Call
	cal_backend_obj_updated().
	(cal_backend_db_remove_object): Call cal_backend_obj_removed().
	(cal_backend_db_get_load_state): Implemented new method.

	* pcs/cal.c (Cal_get_query): Implementation of the ::getQuery()
	method.

svn path=/trunk/; revision=9013

1 files changed, 33 insertions, 7 deletions

diff --git a/calendar/pcs/cal.c b/calendar/pcs/cal.c
index 69eccd7f55..3129665466 100644
--- a/calendar/pcs/cal.c
+++ b/calendar/pcs/cal.c
@@ -22,7 +22,7 @@
 
 #include <config.h>
 #include "cal.h"
-#include "cal-backend.h"
+#include "query.h"
 
 
 
@@ -446,6 +446,31 @@ Cal_remove_object (PortableServer_Servant servant,
 				     NULL);
 }
 
+/* Cal::getQuery implementation */
+static GNOME_Evolution_Calendar_Query
+Cal_get_query (PortableServer_Servant servant,
+	       const CORBA_char *sexp,
+	       GNOME_Evolution_Calendar_QueryListener ql,
+	       CORBA_Environment *ev)
+{
+	Cal *cal;
+	CalPrivate *priv;
+	Query *query;
+
+	cal = CAL (bonobo_object_from_servant (servant));
+	priv = cal->priv;
+
+	query = query_new (priv->backend, ql, sexp);
+	if (!query) {
+		CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
+				     ex_GNOME_Evolution_Calendar_Cal_CouldNotCreate,
+				     NULL);
+		return CORBA_OBJECT_NIL;
+	}
+
+	return BONOBO_OBJREF (query);
+}
+
 /**
  * cal_get_epv:
  * @void:
@@ -460,16 +485,17 @@ cal_get_epv (void)
 	POA_GNOME_Evolution_Calendar_Cal__epv *epv;
 
 	epv = g_new0 (POA_GNOME_Evolution_Calendar_Cal__epv, 1);
-	epv->_get_uri     = Cal_get_uri;
+	epv->_get_uri = Cal_get_uri;
 	epv->countObjects = Cal_get_n_objects;
-	epv->getObject    = Cal_get_object;
-	epv->getUIds      = Cal_get_uids;
-	epv->getChanges   = Cal_get_changes;
-	epv->getObjectsInRange  = Cal_get_objects_in_range;
-	epv->getAlarmsInRange   = Cal_get_alarms_in_range;
+	epv->getObject = Cal_get_object;
+	epv->getUIDs = Cal_get_uids;
+	epv->getChanges = Cal_get_changes;
+	epv->getObjectsInRange = Cal_get_objects_in_range;
+	epv->getAlarmsInRange = Cal_get_alarms_in_range;
 	epv->getAlarmsForObject = Cal_get_alarms_for_object;
 	epv->updateObject = Cal_update_object;
 	epv->removeObject = Cal_remove_object;
+	epv->getQuery = Cal_get_query;
 
 	return epv;
 }