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* Engine for live queries to calendars. A query object watches a CalBackendFederico Mena Quintero2001-03-301-0/+69
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