/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ /* Evolution calendar - generic backend class * * Copyright (C) 2000 Helix Code, Inc. * * Authors: Federico Mena-Quintero * JP Rosevear * * 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. */ #include #include #include #include #include #include "e-util/e-dbhash.h" #include "cal-backend.h" #include "libversit/vcc.h" /* Signal IDs */ enum { LAST_CLIENT_GONE, LAST_SIGNAL }; static void cal_backend_class_init (CalBackendClass *class); static void cal_backend_init (CalBackend *backend); static void cal_backend_destroy (GtkObject *object); static GtkObjectClass *parent_class; static guint cal_backend_signals[LAST_SIGNAL]; #define CLASS(backend) (CAL_BACKEND_CLASS (GTK_OBJECT (backend)->klass)) /** * cal_backend_get_type: * @void: * * Registers the #CalBackend class if necessary, and returns the type ID * associated to it. * * Return value: The type ID of the #CalBackend class. **/ GtkType cal_backend_get_type (void) { static GtkType cal_backend_type = 0; if (!cal_backend_type) { static const GtkTypeInfo cal_backend_info = { "CalBackend", sizeof (CalBackend), sizeof (CalBackendClass), (GtkClassInitFunc) cal_backend_class_init, (GtkObjectInitFunc) cal_backend_init, NULL, /* reserved_1 */ NULL, /* reserved_2 */ (GtkClassInitFunc) NULL }; cal_backend_type = gtk_type_unique (GTK_TYPE_OBJECT, &cal_backend_info); } return cal_backend_type; } /* Class initialization function for the calendar backend */ static void cal_backend_class_init (CalBackendClass *class) { GtkObjectClass *object_class; object_class = (GtkObjectClass *) class; parent_class = gtk_type_class (GTK_TYPE_OBJECT); object_class->destroy = cal_backend_destroy; cal_backend_signals[LAST_CLIENT_GONE] = gtk_signal_new ("last_client_gone", GTK_RUN_FIRST, object_class->type, GTK_SIGNAL_OFFSET (CalBackendClass, last_client_gone), gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0); gtk_object_class_add_signals (object_class, cal_backend_signals, LAST_SIGNAL); } /* Per instance initialization function */ static void cal_backend_init (CalBackend *backend) { backend->uri = NULL; } static void cal_backend_destroy (GtkObject *object) { CalBackend *backend; g_return_if_fail (object != NULL); g_return_if_fail (IS_CAL_BACKEND (object)); backend = CAL_BACKEND (object); if (backend->uri) gnome_vfs_uri_unref (backend->uri); if (GTK_OBJECT_CLASS (parent_class)->destroy) (* GTK_OBJECT_CLASS (parent_class)->destroy) (object); } /** * cal_backend_get_uri: * @backend: A calendar backend. * * Queries the URI of a calendar backend, which must already have a loaded * calendar. * * Return value: The URI where the calendar is stored. **/ GnomeVFSURI * cal_backend_get_uri (CalBackend *backend) { g_return_val_if_fail (backend != NULL, NULL); g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL); g_assert (CLASS (backend)->get_uri != NULL); return (* CLASS (backend)->get_uri) (backend); } static void cal_backend_set_uri (CalBackend *backend, GnomeVFSURI *uri) { if (backend->uri) gnome_vfs_uri_unref (backend->uri); gnome_vfs_uri_ref (uri); backend->uri = uri; } /** * cal_backend_add_cal: * @backend: A calendar backend. * @cal: A calendar client interface object. * * Adds a calendar client interface object to a calendar @backend. * The calendar backend must already have a loaded calendar. **/ void cal_backend_add_cal (CalBackend *backend, Cal *cal) { g_return_if_fail (backend != NULL); g_return_if_fail (IS_CAL_BACKEND (backend)); g_assert (CLASS (backend)->add_cal != NULL); (* CLASS (backend)->add_cal) (backend, cal); } /** * cal_backend_load: * @backend: A calendar backend. * @uri: URI that contains the calendar data. * * Loads a calendar backend with data from a calendar stored at the specified * URI. * * Return value: An operation status code. **/ CalBackendLoadStatus cal_backend_load (CalBackend *backend, GnomeVFSURI *uri) { CalBackendLoadStatus result; g_return_val_if_fail (backend != NULL, CAL_BACKEND_LOAD_ERROR); g_return_val_if_fail (IS_CAL_BACKEND (backend), CAL_BACKEND_LOAD_ERROR); g_return_val_if_fail (uri != NULL, CAL_BACKEND_LOAD_ERROR); g_assert (CLASS (backend)->load != NULL); result = (* CLASS (backend)->load) (backend, uri); if (result == CAL_BACKEND_LOAD_SUCCESS) cal_backend_set_uri (backend, uri); return result; } /** * cal_backend_create: * @backend: A calendar backend. * @uri: URI that will contain the calendar data. * * Creates a new empty calendar in a calendar backend. **/ void cal_backend_create (CalBackend *backend, GnomeVFSURI *uri) { g_return_if_fail (backend != NULL); g_return_if_fail (IS_CAL_BACKEND (backend)); g_return_if_fail (uri != NULL); g_assert (CLASS (backend)->create != NULL); (* CLASS (backend)->create) (backend, uri); cal_backend_set_uri (backend, uri); } /** * cal_backend_get_n_objects: * @backend: A calendar backend. * @type: Types of objects that will be included in the count. * * Queries the number of calendar objects of a particular type. * * Return value: Number of objects of the specified @type. **/ int cal_backend_get_n_objects (CalBackend *backend, CalObjType type) { g_return_val_if_fail (backend != NULL, -1); g_return_val_if_fail (IS_CAL_BACKEND (backend), -1); g_assert (CLASS (backend)->get_n_objects != NULL); return (* CLASS (backend)->get_n_objects) (backend, type); } /** * cal_backend_get_object: * @backend: A calendar backend. * @uid: Unique identifier for a calendar object. * * Queries a calendar backend for a calendar object based on its unique * identifier. * * Return value: The string representation of a complete calendar wrapping the * the sought object, or NULL if no object had the specified UID. A complete * calendar is returned because you also need the timezone data. **/ char * cal_backend_get_object (CalBackend *backend, const char *uid) { g_return_val_if_fail (backend != NULL, NULL); g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL); g_return_val_if_fail (uid != NULL, NULL); g_assert (CLASS (backend)->get_object != NULL); return (* CLASS (backend)->get_object) (backend, uid); } /** * cal_backend_get_uids: * @backend: A calendar backend. * @type: Bitmask with types of objects to return. * * Builds a list of unique identifiers corresponding to calendar objects whose * type matches one of the types specified in the @type flags. * * Return value: A list of strings that are the sought UIDs. The list should be * freed using the cal_obj_uid_list_free() function. **/ GList * cal_backend_get_uids (CalBackend *backend, CalObjType type) { g_return_val_if_fail (backend != NULL, NULL); g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL); g_assert (CLASS (backend)->get_uids != NULL); return (* CLASS (backend)->get_uids) (backend, type); } typedef struct { CalBackend *backend; GList *changes; GList *change_ids; } CalBackendComputeChangesData; static void cal_backend_compute_changes_foreach_key (const char *key, gpointer data) { CalBackendComputeChangesData *be_data = data; char *calobj = cal_backend_get_object (be_data->backend, key); if (calobj == NULL) { CalComponent *comp; GNOME_Evolution_Calendar_CalObjChange *coc; comp = cal_component_new (); cal_component_set_new_vtype (comp, CAL_COMPONENT_TODO); cal_component_set_uid (comp, key); coc = GNOME_Evolution_Calendar_CalObjChange__alloc (); coc->calobj = CORBA_string_dup (cal_component_get_as_string (comp)); coc->type = GNOME_Evolution_Calendar_DELETED; be_data->changes = g_list_prepend (be_data->changes, coc); be_data->change_ids = g_list_prepend (be_data->change_ids, (gpointer) key); } } static GNOME_Evolution_Calendar_CalObjChangeSeq * cal_backend_compute_changes (CalBackend *backend, CalObjType type, const char *change_id) { char *filename; EDbHash *ehash; CalBackendComputeChangesData be_data; GNOME_Evolution_Calendar_CalObjChangeSeq *seq; GList *uids, *changes = NULL, *change_ids = NULL; GList *i, *j; int n; /* Find the changed ids - FIX ME, path should not be hard coded */ filename = g_strdup_printf ("%s/evolution/local/Calendar/%s.db", g_get_home_dir (), change_id); ehash = e_dbhash_new (filename); g_free (filename); uids = cal_backend_get_uids (backend, type); /* Calculate adds and modifies */ for (i = uids; i != NULL; i = i->next) { GNOME_Evolution_Calendar_CalObjChange *coc; char *uid = i->data; char *calobj = cal_backend_get_object (backend, uid); g_assert (calobj != NULL); /* check what type of change has occurred, if any */ switch (e_dbhash_compare (ehash, uid, calobj)) { case E_DBHASH_STATUS_SAME: break; case E_DBHASH_STATUS_NOT_FOUND: coc = GNOME_Evolution_Calendar_CalObjChange__alloc (); coc->calobj = CORBA_string_dup (calobj); coc->type = GNOME_Evolution_Calendar_ADDED; changes = g_list_prepend (changes, coc); change_ids = g_list_prepend (change_ids, uid); break; case E_DBHASH_STATUS_DIFFERENT: coc = GNOME_Evolution_Calendar_CalObjChange__alloc (); coc->calobj = CORBA_string_dup (calobj); coc->type = GNOME_Evolution_Calendar_ADDED; changes = g_list_append (changes, coc); change_ids = g_list_prepend (change_ids, uid); break; } } /* Calculate deletions */ be_data.backend = backend; be_data.changes = changes; be_data.change_ids = change_ids; e_dbhash_foreach_key (ehash, (EDbHashFunc)cal_backend_compute_changes_foreach_key, &be_data); changes = be_data.changes; change_ids = be_data.change_ids; /* Build the sequence and update the hash */ n = g_list_length (changes); seq = GNOME_Evolution_Calendar_CalObjChangeSeq__alloc (); seq->_length = n; seq->_buffer = CORBA_sequence_GNOME_Evolution_Calendar_CalObjChange_allocbuf (n); CORBA_sequence_set_release (seq, TRUE); for (i = changes, j = change_ids, n = 0; i != NULL; i = i->next, j = j->next, n++) { GNOME_Evolution_Calendar_CalObjChange *coc = i->data; GNOME_Evolution_Calendar_CalObjChange *seq_coc; char *uid = j->data; /* sequence building */ seq_coc = &seq->_buffer[n]; seq_coc->calobj = CORBA_string_dup (coc->calobj); seq_coc->type = coc->type; /* hash updating */ if (coc->type == GNOME_Evolution_Calendar_ADDED || coc->type == GNOME_Evolution_Calendar_MODIFIED) { e_dbhash_add (ehash, uid, coc->calobj); } else { e_dbhash_remove (ehash, uid); } CORBA_free (coc); } e_dbhash_write (ehash); e_dbhash_destroy (ehash); cal_obj_uid_list_free (uids); g_list_free (change_ids); g_list_free (changes); return seq; } /** * cal_backend_get_changes: * @backend: * @type: * @change_id: * * * * Return value: **/ GNOME_Evolution_Calendar_CalObjChangeSeq * cal_backend_get_changes (CalBackend *backend, CalObjType type, const char *change_id) { g_return_val_if_fail (backend != NULL, NULL); g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL); return cal_backend_compute_changes (backend, type, change_id); } /** * cal_backend_get_objects_in_range: * @backend: A calendar backend. * @type: Bitmask with types of objects to return. * @start: Start time for query. * @end: End time for query. * * Builds a list of unique identifiers corresponding to calendar objects of the * specified type that occur or recur within the specified time range. * * Return value: A list of UID strings. The list should be freed using the * cal_obj_uid_list_free() function. **/ GList * cal_backend_get_objects_in_range (CalBackend *backend, CalObjType type, time_t start, time_t end) { g_return_val_if_fail (backend != NULL, NULL); g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL); g_return_val_if_fail (start != -1 && end != -1, NULL); g_return_val_if_fail (start <= end, NULL); g_assert (CLASS (backend)->get_objects_in_range != NULL); return (* CLASS (backend)->get_objects_in_range) (backend, type, start, end); } /** * cal_backend_get_alarms_in_range: * @backend: A calendar backend. * @start: Start time for query. * @end: End time for query. * * Builds a sorted list of the alarms that trigger in the specified time range. * * Return value: A list of #CalAlarmInstance structures, sorted by trigger time. **/ GList * cal_backend_get_alarms_in_range (CalBackend *backend, time_t start, time_t end) { g_return_val_if_fail (backend != NULL, NULL); g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL); g_return_val_if_fail (start != -1 && end != -1, NULL); g_return_val_if_fail (start <= end, NULL); g_assert (CLASS (backend)->get_alarms_in_range != NULL); return (* CLASS (backend)->get_alarms_in_range) (backend, start, end); } /** * cal_backend_get_alarms_for_object: * @backend: A calendar backend. * @uid: Unique identifier for a calendar object. * @start: Start time for query. * @end: End time for query. * @alarms: Return value for the list of alarm instances. * * Builds a sorted list of the alarms of the specified event that trigger in a * particular time range. * * Return value: TRUE on success, FALSE if the object was not found. **/ gboolean cal_backend_get_alarms_for_object (CalBackend *backend, const char *uid, time_t start, time_t end, GList **alarms) { g_return_val_if_fail (backend != NULL, FALSE); g_return_val_if_fail (IS_CAL_BACKEND (backend), FALSE); g_return_val_if_fail (uid != NULL, FALSE); g_return_val_if_fail (start != -1 && end != -1, FALSE); g_return_val_if_fail (start <= end, FALSE); g_return_val_if_fail (alarms != NULL, FALSE); g_assert (CLASS (backend)->get_alarms_for_object != NULL); return (* CLASS (backend)->get_alarms_for_object) (backend, uid, start, end, alarms); } /** * cal_backend_update_object: * @backend: A calendar backend. * @uid: Unique identifier of the object to update. * @calobj: String representation of the new calendar object. * * Updates an object in a calendar backend. It will replace any existing * object that has the same UID as the specified one. The backend will in * turn notify all of its clients about the change. * * Return value: TRUE on success, FALSE on being passed an invalid object or one * with an unsupported type. **/ gboolean cal_backend_update_object (CalBackend *backend, const char *uid, const char *calobj) { g_return_val_if_fail (backend != NULL, FALSE); g_return_val_if_fail (IS_CAL_BACKEND (backend), FALSE); g_return_val_if_fail (uid != NULL, FALSE); g_return_val_if_fail (calobj != NULL, FALSE); g_assert (CLASS (backend)->update_object != NULL); return (* CLASS (backend)->update_object) (backend, uid, calobj); } /** * cal_backend_remove_object: * @backend: A calendar backend. * @uid: Unique identifier of the object to remove. * * Removes an object in a calendar backend. The backend will notify all of its * clients about the change. * * Return value: TRUE on success, FALSE on being passed an UID for an object * that does not exist in the backend. **/ gboolean cal_backend_remove_object (CalBackend *backend, const char *uid) { g_return_val_if_fail (backend != NULL, FALSE); g_return_val_if_fail (IS_CAL_BACKEND (backend), FALSE); g_return_val_if_fail (uid != NULL, FALSE); g_assert (CLASS (backend)->remove_object != NULL); return (* CLASS (backend)->remove_object) (backend, uid); } /** * cal_backend_last_client_gone: * @backend: A calendar backend. * * Emits the "last_client_gone" signal of a calendar backend. This function is * to be used only by backend implementations. **/ void cal_backend_last_client_gone (CalBackend *backend) { g_return_if_fail (backend != NULL); g_return_if_fail (IS_CAL_BACKEND (backend)); gtk_signal_emit (GTK_OBJECT (backend), cal_backend_signals[LAST_CLIENT_GONE]); }