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authorRodrigo Moya <rodrigo@ximian.com>2001-02-13 02:35:27 +0800
committerRodrigo Moya <rodrigo@src.gnome.org>2001-02-13 02:35:27 +0800
commit71a1d2e707a2b5dc68c00ae4d69747c3a2f6385e (patch)
tree68a660f19762799d2660d5009d324933fee83284 /calendar/pcs/cal-backend-db.c
parent59c9a8d6f3bac89647cf5ca9ffe9d81db469c1bf (diff)
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added the new DB3-based backend. This is just the beginning, there are
2001-02-11 Rodrigo Moya <rodrigo@ximian.com> * pcs/cal-backend-db.[ch]: added the new DB3-based backend. This is just the beginning, there are some missing things still. svn path=/trunk/; revision=8182
Diffstat (limited to 'calendar/pcs/cal-backend-db.c')
-rw-r--r--calendar/pcs/cal-backend-db.c995
1 files changed, 995 insertions, 0 deletions
diff --git a/calendar/pcs/cal-backend-db.c b/calendar/pcs/cal-backend-db.c
new file mode 100644
index 0000000000..0165164e5e
--- /dev/null
+++ b/calendar/pcs/cal-backend-db.c
@@ -0,0 +1,995 @@
+/* Evolution calendar - iCalendar DB backend
+ *
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Author: Rodrigo Moya <rodrigo@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.
+ */
+
+#include <config.h>
+#include <gtk/gtkobject.h>
+#include "cal-util/cal-recur.h"
+#include "cal-backend-db.h"
+#include <db.h>
+#if DB_MAJOR_VERSION < 3
+# error "You need libdb3 to compile the DB backend"
+#endif
+
+/* structure to identify an open cursor */
+typedef struct {
+ DBC* dbc;
+ DB* parent_db;
+ /* TODO: convert into a hash table */
+ GList* keys;
+ GList* data;
+} CalBackendDBCursor;
+
+/* private part of the CalBackendDB structure */
+struct _CalBackendDBPrivate {
+ /* URI where the calendar data is stored */
+ GnomeVFSURI *uri;
+
+ /* Berkeley DB's library handles */
+ DB *objects_db;
+ DB *history_db;
+
+ /* list of open cursors */
+ GList *cursors;
+
+ /* list of clients using this backend */
+ GList *clients;
+};
+
+static void cal_backend_db_class_init (CalBackendDBClass *klass);
+static void cal_backend_db_init (CalBackendDB *cbdb);
+static void cal_backend_db_destroy (GtkObject *object);
+
+static GnomeVFSURI *cal_backend_db_get_uri (CalBackend *backend);
+static void cal_backend_db_add_cal (CalBackend *backend, Cal *cal);
+static CalBackendOpenStatus cal_backend_db_open (CalBackend *backend,
+ GnomeVFSURI *uri,
+ gboolean only_if_exists);
+
+static int cal_backend_db_get_n_objects (CalBackend *backend, CalObjType type);
+static char *cal_backend_db_get_object (CalBackend *backend, const char *uid);
+static CalObjType cal_backend_db_get_type_by_uid (CalBackend *backend, const char *uid);
+static GList* cal_backend_db_get_uids (CalBackend *backend, CalObjType type);
+static GList* cal_backend_db_get_objects_in_range (CalBackend *backend,
+ CalObjType type,
+ time_t start,
+ time_t end);
+static GNOME_Evolution_Calendar_CalObjChangeSeq *cal_backend_db_get_changes (
+ CalBackend *backend, CalObjType type, const char *change_id);
+
+static GNOME_Evolution_Calendar_CalComponentAlarmsSeq *cal_backend_db_get_alarms_in_range (
+ CalBackend *backend, time_t start, time_t end);
+
+static GNOME_Evolution_Calendar_CalComponentAlarms *cal_backend_db_get_alarms_for_object (
+ CalBackend *backend, const char *uid, time_t start, time_t end, gboolean *object_found);
+
+static gboolean cal_backend_db_update_object (CalBackend *backend,
+ const char *uid,
+ const char *calobj);
+static gboolean cal_backend_db_remove_object (CalBackend *backend, const char *uid);
+
+static void close_cursor (CalBackendDB *cbdb, CalBackendDBCursor *cursor);
+static CalBackendDBCursor* open_cursor (CalBackendDB *cbdb, DB *db);
+static CalBackendDBCursor* find_cursor_by_db (CalBackendDB *cbdb, DB *db);
+static DBT* find_record_by_id (CalBackendDBCursor *cursor, const gchar *id);
+
+static CalBackendClass *parent_class;
+
+/**
+ * cal_backend_db_get_type:
+ * @void:
+ *
+ * Registers the #CalBackendDB class if necessary and returns the type ID
+ * associated to it.
+ *
+ * Return value: The type ID of the #CalBackendDB class.
+ */
+GtkType
+cal_backend_db_get_type (void)
+{
+ static GtkType cal_backend_db_type = 0;
+
+ if (!cal_backend_db_type) {
+ static const GtkTypeInfo cal_backend_db_info = {
+ "CalBackendDB",
+ sizeof (CalBackendDB),
+ sizeof (CalBackendDBClass),
+ (GtkClassInitFunc) cal_backend_db_class_init,
+ (GtkObjectInitFunc) cal_backend_db_init,
+ NULL,
+ NULL,
+ (GtkClassInitFunc) NULL
+ };
+
+ cal_backend_db_type = gtk_type_unique(CAL_BACKEND_TYPE, &cal_backend_db_info);
+ }
+
+ return cal_backend_db_type;
+}
+
+/* class initialization function for the DB backend */
+static void
+cal_backend_db_class_init (CalBackendDBClass *klass)
+{
+ GtkObjectClass *object_class;
+ CalBackendClass *backend_class;
+
+ object_class = (GtkObjectClass *) klass;
+ backend_class = (CalBackendClass *) klass;
+
+ parent_class = gtk_type_class(CAL_BACKEND_TYPE);
+
+ object_class->destroy = cal_backend_db_destroy;
+
+ backend_class->get_uri = cal_backend_db_get_uri;
+ backend_class->add_cal = cal_backend_db_add_cal;
+ backend_class->open = cal_backend_db_open;
+ backend_class->get_n_objects = cal_backend_db_get_n_objects;
+ backend_class->get_object = cal_backend_db_get_object;
+ backend_class->get_type_by_uid = cal_backend_db_get_type_by_uid;
+ backend_class->get_uids = cal_backend_db_get_uids;
+ backend_class->get_objects_in_range = cal_backend_db_get_objects_in_range;
+ backend_class->get_changes = cal_backend_db_get_changes;
+ backend_class->get_alarms_in_range = cal_backend_db_get_alarms_in_range;
+ backend_class->get_alarms_for_object = cal_backend_db_get_alarms_for_object;
+ backend_class->update_object = cal_backend_db_update_object;
+ backend_class->remove_object = cal_backend_db_remove_object;
+}
+
+/* object initialization function for the DB backend */
+static void
+cal_backend_db_init (CalBackendDB *cbdb)
+{
+ CalBackendDBPrivate *priv;
+
+ priv = g_new0(CalBackendDBPrivate, 1);
+ cbdb->priv = priv;
+}
+
+/* Destroy handler for the DB backend */
+static void
+cal_backend_db_destroy (GtkObject *object)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBPrivate *priv;
+ GList *node;
+
+ g_return_if_fail(object != NULL);
+ g_return_if_fail(IS_CAL_BACKEND_DB(object));
+
+ cbdb = CAL_BACKEND_DB(object);
+ priv = cbdb->priv;
+
+ g_assert(cbdb->priv->clients == NULL);
+
+ /* clean up */
+ if (priv->uri) {
+ gnome_vfs_uri_unref(priv->uri);
+ priv->uri = NULL;
+ }
+
+ /* close open cursors */
+ while ((node = g_list_first(cbdb->priv->cursors))) {
+ close_cursor(cbdb, (CalBackendDBCursor *) node->data);
+ }
+
+ /* close open databases */
+ if (cbdb->priv->objects_db)
+ cbdb->priv->objects_db->close(cbdb->priv->objects_db, 0);
+ if (cbdb->priv->history_db)
+ cbdb->priv->history_db->close(cbdb->priv->history_db, 0);
+
+ g_free((gpointer) priv);
+ cbdb->priv = NULL;
+
+ if (GTK_OBJECT_CLASS(parent_class)->destroy)
+ (*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+}
+
+/*
+ * Private functions
+ */
+
+/* close an open cursor and frees all associated memory */
+static void
+close_cursor (CalBackendDB *cbdb, CalBackendDBCursor *cursor)
+{
+ GList *node;
+ DBT *dbt;
+
+ g_return_if_fail(cursor != NULL);
+
+ /* free all keys and data */
+ while ((node = g_list_first(cursor->keys))) {
+ dbt = (DBT *) node->data;
+ cursor->keys = g_list_remove(cursor->keys, (gpointer) dbt);
+ g_free((gpointer) dbt);
+ }
+ while ((node = g_list_first(cursor->data))) {
+ dbt = (DBT *) node->data;
+ cursor->data = g_list_remove(cursor->data, (gpointer) dbt);
+ g_free((gpointer) dbt);
+ }
+
+ /* finally, close the cursor */
+ cursor->dbc->c_close(cursor->dbc);
+
+ cbdb->priv->cursors = g_list_remove(cbdb->priv->cursors, (gpointer) cursor);
+ g_free((gpointer) cursor);
+}
+
+/* open a cursor for the given database */
+static CalBackendDBCursor *
+open_cursor (CalBackendDB *cbdb, DB *db)
+{
+ CalBackendDBCursor *cursor;
+ gint ret;
+
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(db != NULL, NULL);
+
+ /* search for the cursor in our list of cursors */
+ cursor = find_cursor_by_db(cbdb, db);
+ if (cursor)
+ return cursor;
+
+ /* create the cursor */
+ cursor = g_new0(CalBackendDBCursor, 1);
+ cursor->parent_db = db;
+
+ ret = db->cursor(db, NULL, &cursor->dbc, 0);
+ if (ret == 0) {
+ DBT key;
+ DBT data;
+
+ /* read data */
+ while ((ret = cursor->dbc->c_get(cursor->dbc, &key, &data, DB_NEXT)) == 0) {
+ cursor->keys = g_list_append(cursor->keys, g_memdup(&key, sizeof(key)));
+ cursor->data = g_list_append(cursor->data, g_memdup(&data, sizeof(data)));
+ }
+ if (ret == DB_NOTFOUND) {
+ cbdb->priv->cursors = g_list_prepend(cbdb->priv->cursors,
+ (gpointer) cursor);
+ return cursor;
+ }
+
+ /* close cursor on error */
+ close_cursor(cbdb, cursor);
+ }
+
+ return NULL;
+}
+
+/* search for a cursor in the given backend */
+static CalBackendDBCursor *
+find_cursor_by_db (CalBackendDB *cbdb, DB *db)
+{
+ GList *node;
+
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+ g_return_val_if_fail(db != NULL, NULL);
+
+ for (node = g_list_first(cbdb->priv->cursors); node != NULL; node = g_list_next(node)) {
+ CalBackendDBCursor* cursor = (CalBackendDBCursor *) node->data;
+ if (cursor && cursor->parent_db == db)
+ return cursor;
+ }
+
+ return NULL; /* not found */
+}
+
+/* finds a record in a cursor by its ID */
+static DBT *
+find_record_by_id (CalBackendDBCursor *cursor, const gchar *id)
+{
+ GList *node;
+ gint pos = 0;
+
+ g_return_val_if_fail(cursor != NULL, NULL);
+ g_return_val_if_fail(id != NULL, NULL);
+
+ for (node = g_list_first(cursor->keys); node != NULL; node = g_list_next(node)) {
+ DBT* key = (DBT *) node->data;
+ if (key) {
+ if (!strcmp(key->data, id)) {
+ GList* tmp = g_list_nth(cursor->data, pos);
+ if (tmp)
+ return (DBT *) node->data;
+ }
+ }
+ pos++;
+ }
+
+ return NULL; /* not found */
+}
+
+/*
+ * Calendar backend methods
+ */
+
+/* get_uri handler for the DB backend */
+static GnomeVFSURI *
+cal_backend_db_get_uri (CalBackend *backend)
+{
+ CalBackendDB *cbdb;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+
+ return cbdb->priv->uri;
+}
+
+/* callback used when a Cal is destroyed */
+static void
+destroy_cal_cb (GtkObject *object, gpointer data)
+{
+ Cal *cal;
+ Cal *tmp_cal;
+ CalBackendDB *cbdb;
+ GList *node;
+
+ cal = CAL(object);
+ cbdb = CAL_BACKEND_DB(data);
+
+ g_return_if_fail(IS_CAL_BACKEND_DB(cbdb));
+ g_return_if_fail(cbdb->priv != NULL);
+
+ /* find the Cal in the list of clients */
+ for (node = cbdb->priv->clients; node != NULL; node = g_list_next(node)) {
+ tmp_cal = CAL(node->data);
+ if (tmp_cal == cal)
+ break;
+ }
+
+ if (node) {
+ /* disconnect this Cal */
+ cbdb->priv->clients = g_list_remove_link(cbdb->priv->clients, node);
+ g_list_free_1(node);
+
+ /* when all clients go away, notify the parent factory about it so that
+ * it may decide to kill the backend or not.
+ */
+ if (!cbdb->priv->clients)
+ cal_backend_last_client_gone(CAL_BACKEND(cbdb));
+ }
+}
+
+/* add_cal_handler for the DB backend */
+static void
+cal_backend_db_add_cal (CalBackend *backend, Cal *cal)
+{
+ CalBackendDB *cbdb;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_if_fail(IS_CAL_BACKEND_DB(cbdb));
+ g_return_if_fail(cbdb->priv != NULL);
+ g_return_if_fail(IS_CAL(cal));
+
+ /* we do not keep a reference to the Cal since the calendar user agent
+ * owns it
+ */
+ gtk_signal_connect(GTK_OBJECT(cal),
+ "destroy",
+ GTK_SIGNAL_FUNC(destroy_cal_cb),
+ backend);
+
+ cbdb->priv->clients = g_list_prepend(cbdb->priv->clients, (gpointer) cal);
+}
+
+/* database file initialization */
+static gboolean
+open_database_file (CalBackendDB *cbdb, const gchar *str_uri, gboolean only_if_exists)
+{
+ gint ret;
+
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), FALSE);
+ g_return_val_if_fail(cbdb->priv != NULL, FALSE);
+ g_return_val_if_fail(cbdb->priv->objects_db != NULL, FALSE);
+ g_return_val_if_fail(cbdb->priv->history_db != NULL, FALSE);
+ g_return_val_if_fail(str_uri != NULL, FALSE);
+
+ /* open/create objects database into given file */
+ if (only_if_exists) {
+ ret = cbdb->priv->objects_db->open(cbdb->priv->objects_db,
+ str_uri,
+ "calendar_objects",
+ DB_HASH,
+ 0,
+ 0644);
+ }
+ else {
+ ret = cbdb->priv->objects_db->open(cbdb->priv->objects_db,
+ str_uri,
+ "calendar_objects",
+ DB_HASH,
+ DB_CREATE,
+ 0644);
+ }
+ if (ret == 0) {
+ /* now, open the history database */
+ ret = cbdb->priv->history_db->open(cbdb->priv->history_db,
+ str_uri,
+ "calendar_history",
+ DB_BTREE,
+ DB_CREATE,
+ 0644);
+ if (ret == 0) return TRUE;
+
+ /* close objects database on error */
+ cbdb->priv->objects_db->close(cbdb->priv->objects_db, 0);
+ }
+
+ return FALSE;
+}
+
+/* open handler for the DB backend */
+static CalBackendOpenStatus
+cal_backend_db_open (CalBackend *backend, GnomeVFSURI *uri, gboolean only_if_exists)
+{
+ CalBackendDB *cbdb;
+ gchar *str_uri;
+ gint ret;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), CAL_BACKEND_OPEN_ERROR);
+ g_return_val_if_fail(cbdb->priv != NULL, CAL_BACKEND_OPEN_ERROR);
+ g_return_val_if_fail(uri != NULL, CAL_BACKEND_OPEN_ERROR);
+ g_return_val_if_fail(cbdb->priv->objects_db == NULL, CAL_BACKEND_OPEN_ERROR);
+
+ /* open the given URI */
+ if (!gnome_vfs_uri_is_local(uri))
+ return CAL_BACKEND_OPEN_ERROR;
+ str_uri = gnome_vfs_uri_to_string(uri,
+ (GNOME_VFS_URI_HIDE_USER_NAME
+ | GNOME_VFS_URI_HIDE_PASSWORD
+ | GNOME_VFS_URI_HIDE_HOST_NAME
+ | GNOME_VFS_URI_HIDE_HOST_PORT
+ | GNOME_VFS_URI_HIDE_TOPLEVEL_METHOD));
+
+ /* open database file */
+ if ((ret = db_create(&cbdb->priv->objects_db, NULL, 0)) != 0
+ || (ret = db_create(&cbdb->priv->history_db, NULL, 0)) != 0) {
+ g_free((gpointer) str_uri);
+ return CAL_BACKEND_OPEN_ERROR;
+ }
+ if (!open_database_file(cbdb, (const gchar *) str_uri, only_if_exists)) {
+ g_free((gpointer) str_uri);
+ return CAL_BACKEND_OPEN_ERROR;
+ }
+
+ gnome_vfs_uri_ref(uri);
+ cbdb->priv->uri = uri;
+ g_free((gpointer) str_uri);
+
+ return CAL_BACKEND_OPEN_SUCCESS;
+}
+
+/* get_n_objects handler for the DB backend */
+static int
+cal_backend_db_get_n_objects (CalBackend *backend, CalObjType type)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+ int total_count = 0;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), -1);
+ g_return_val_if_fail(cbdb->priv != NULL, -1);
+
+ /* open the cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ GList *node;
+
+ /* we traverse all data, to check for each object's type */
+ for (node = g_list_first(cursor->data); node != NULL; node = g_list_next(node)) {
+ icalcomponent *icalcomp;
+ DBT *data = (DBT *) node->data;
+
+ icalcomp = icalparser_parse_string((char *) data->data);
+ if (icalcomp) {
+ switch (icalcomponent_isa(icalcomp)) {
+ case ICAL_VEVENT_COMPONENT :
+ if (type & CALOBJ_TYPE_EVENT)
+ total_count++;
+ break;
+ case ICAL_VTODO_COMPONENTS :
+ if (type & CALOBJ_TYPE_TODO)
+ total_count++;
+ break;
+ case ICAL_VJOURNAL_COMPONENT :
+ if (type & CALOBJ_TYPE_JOURNAL)
+ total_count++;
+ break;
+ }
+ icalcomponent_free(icalcomp);
+ }
+ }
+ }
+
+ return total_count;
+}
+
+/* get_object handler for the DB backend */
+static char *
+cal_backend_db_get_object (CalBackend *backend, const char *uid)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+ g_return_val_if_fail(cbdb->priv->objects_db != NULL, NULL);
+ g_return_val_if_fail(uid != NULL, NULL);
+
+ /* open cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ gint ret;
+ DBT *data;
+
+ data = find_record_by_id(cursor, uid);
+ if (data)
+ return (char *) data->data;
+ }
+
+ return NULL;
+}
+
+/* get_type_by_uid handler for the DB backend */
+static CalObjType
+cal_backend_db_get_type_by_uid (CalBackend *backend, const char *uid)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), CAL_COMPONENT_NO_TYPE);
+ g_return_val_if_fail(cbdb->priv != NULL, CAL_COMPONENT_NO_TYPE);
+ g_return_val_if_fail(cbdb->priv->objects_db != NULL, CAL_COMPONENT_NO_TYPE);
+ g_return_val_if_fail(uid != NULL, CAL_COMPONENT_NO_TYPE);
+
+ /* open the cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ DBT *data = find_record_by_id(cursor, uid);
+ if (data) {
+ icalcomponent icalcomp = icalparser_parse_string((char *) data->data);
+ if (icalcomp) {
+ CalObjType type;
+
+ switch (icalcomponent_isa(icalcomp)) {
+ case ICAL_VEVENT_COMPONENT :
+ type = CALOBJ_TYPE_EVENT;
+ break;
+ case ICAL_VTODO_COMPONENT :
+ type = CALOBJ_TYPE_TODO;
+ break;
+ case ICAL_VJOURNAL_COMPONENT :
+ type = CALOBJ_TYPE_JOURNAL;
+ break;
+ default :
+ type CAL_COMPONENT_NO_TYPE;
+ }
+
+ icalcomponent_free(icalcomp);
+ return type;
+ }
+ }
+ }
+
+ return CAL_COMPONENT_NO_TYPE;
+}
+
+static GList *
+add_uid_if_match (GList *list, CalBackendDBCursor *cursor, GList *data_node, CalObjType type)
+{
+ DBT *data;
+
+ g_return_val_if_fail(cursor != NULL, list);
+ g_return_val_if_fail(data_node != NULL, list);
+
+ data = (DBT *) data_node->data;
+ if (data) {
+ icalcomponent *icalcomp;
+ gchar *uid;
+
+ icalcomp = icalparser_parse_string(data->data);
+ if (!icalcomp) return list;
+ switch (icalcomponent_isa(icalcomp)) {
+ case ICAL_VEVENT_COMPONENT :
+ if (type & CALOBJ_TYPE_EVENT)
+ uid = icalcomponent_get_uid(icalcomp);
+ break;
+ case ICAL_VTODO_COMPONENT :
+ if (type & CALOBJ_TYPE_TODO)
+ uid = icalcomponent_get_uid(icalcomp);
+ break;
+ case ICAL_VJOURNAL_COMPONENT :
+ if (type & CALOBJ_TYPE_JOURNAL)
+ uid = icalcomponent_get_uid(icalcomp);
+ break;
+ default :
+ uid = NULL;
+ }
+
+ if (uid)
+ list = g_list_prepend(list, g_strdup(uid));
+ icalcomponent_free(icalcomp);
+ }
+
+ return list;
+}
+
+/* get_uids handler for the DB backend */
+static GList *
+cal_backend_db_get_uids (CalBackend *backend, CalObjType type)
+{
+ CalBackendDB *cbdb;
+ GList *list = NULL;
+ CalBackendDBCursor *cursor;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+ g_return_val_if_fail(cbdb->priv->objects_db != NULL, NULL);
+
+ /* open cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ GList *node;
+
+ /* we traverse all data, to check for each object's type */
+ for (node = g_list_first(cursor->data); node != NULL; node = g_list_next(node)) {
+ list = add_uid_if_match(list, cursor, node, type);
+ }
+ }
+
+ return list;
+}
+
+/* callback used from cal_recur_generate_instances(): adds the component's UID to
+ * our hash table
+ */
+static gboolean
+add_instance (CalComponent *comp, time_t start, time_t end, gpointer data)
+{
+ GHashTable *uid_hash;
+ const char *uid;
+ const char *old_uid;
+
+ uid_hash = data;
+
+ cal_component_get_uid(comp, &uid);
+
+ old_uid = g_hash_table_lookup(uid_hash, uid);
+ if (old_uid)
+ return FALSE;
+
+ g_hash_table_insert(uid_hash, (char *) uid, NULL);
+ return FALSE;
+}
+
+/* creates the list of UIDs in the given range */
+static void
+get_instances_in_range (GHashTable *uid_hash,
+ CalBackendDBCursor *cursor,
+ CalObjType type,
+ time_t start,
+ time_t end)
+{
+ GList *node;
+
+ g_return_if_fail(uid_hash != NULL);
+ g_return_if_fail(cursor != NULL);
+
+ for (node = g_list_first(cursor->data); node != NULL; node = g_list_next(node)) {
+ DBT *data;
+ icalcomponent *icalcomp;
+
+ data = (DBT *) node->data;
+ if (data) {
+ icalcomp = icalparser_parse_string((char *) data->data);
+ if (icalcomp) {
+ CalComponent *comp = cal_component_new();
+ cal_component_set_icalcomponent(comp, icalcomp);
+
+ switch (icalcomponent_isa(icalcomp)) {
+ case ICAL_VEVENT_COMPONENT :
+ if (type & CALOBJ_TYPE_EVENT)
+ cal_recur_generate_instances(comp,
+ start,
+ end,
+ add_instance,
+ uid_hash);
+ break;
+ case ICAL_VTODO_COMPONENT :
+ if (type & CALOBJ_TYPE_TODO)
+ cal_recur_generate_instances(comp,
+ start,
+ end,
+ add_instance,
+ uid_hash);
+ break;
+ case ICAL_VJOURNAL_COMPONENT :
+ if (type & CALOBJ_TYPE_JOURNAL)
+ cal_recur_generate_instances(comp,
+ start,
+ end,
+ add_instance,
+ uid_hash);
+ break;
+ }
+
+ gtk_object_unref(comp);
+ icalcomponent_free(icalcomp);
+ }
+ }
+ }
+}
+
+/* callback used from g_hash_table_foreach: adds a UID from the hash table to our list */
+static void
+add_uid_to_list (gpointer key, gpointer value, gpointer data)
+{
+ GList **list;
+ const char *uid;
+
+ list = (GList **) data;
+
+ uid = (const char *) key;
+ *list = g_list_prepend(*list, (gpointer) g_strdup(uid));
+}
+
+/* get_objects_in_range handler for the DB backend */
+static GList *
+cal_backend_db_get_objects_in_range (CalBackend *backend,
+ CalObjType type,
+ time_t start,
+ time_t end)
+{
+ CalBackendDB *cbdb;
+ GList *list = NULL;
+ CalBackendDBCursor *cursor;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+
+ /* open cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ GHashTable *uid_hash;
+
+ /* build the hash table */
+ uid_hash = g_hash_table_new(g_str_hash, g_str_equal);
+ get_instances_in_range(uid_hash, cursor, type, start, end);
+
+ /* build the list to be returned from the hash table */
+ g_hash_table_foreach(uid_hash, add_uid_to_list, &list);
+ g_hash_table_destroy(uid_hash);
+ }
+
+ return list;
+}
+
+/* get_changes handler for the DB backend */
+static GNOME_Evolution_Calendar_CalObjChangeSeq *
+cal_backend_db_get_changes (CalBackend *backend, CalObjType type, const char *change_id)
+{
+ CalBackendDB *cbdb;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+
+ return NULL;
+}
+
+/* get_alarms_in_range handler for the DB backend */
+static GNOME_Evolution_Calendar_CalComponentAlarmsSeq *
+cal_backend_db_get_alarms_in_range (CalBackend *backend, time_t start, time_t end)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+ gint number_of_alarms;
+ GList *alarm_list;
+ GList *node;
+ gint i;
+ GNOME_Evolution_Calendar_CalComponentAlarmsSeq *seq = NULL;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+ g_return_val_if_fail (start != -1 && end != -1, NULL);
+ g_return_val_if_fail (start <= end, NULL);
+
+ /* open cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ /* TODO: get list of alarms */
+
+ /* create the CORBA sequence */
+ seq = GNOME_Evolution_Calendar_CalComponentAlarmsSeq__alloc();
+ CORBA_sequence_set_release(seq, TRUE);
+ seq->_length = number_of_alarms;
+ seq->_buffer = CORBA_sequence_GNOME_Evolution_Calendar_CalComponentAlarms_allocbuf(number_of_alarms);
+
+ /* TODO: populate CORBA sequence */
+ }
+
+ g_list_free(alarm_list);
+
+ return seq;
+}
+
+/* get_alarms_for_object handler for the DB backend */
+static GNOME_Evolution_Calendar_CalComponentAlarms *
+cal_backend_db_get_alarms_for_object (CalBackend *backend,
+ const char *uid,
+ time_t start,
+ time_t end,
+ gboolean *object_found)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+ GNOME_Evolution_Calendar_CalComponentAlarms *corba_alarms = NULL;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), NULL);
+ g_return_val_if_fail(cbdb->priv != NULL, NULL);
+ g_return_val_if_fail(uid != NULL, NULL);
+ g_return_val_if_fail(start != -1 && end != -1, NULL);
+ g_return_val_if_fail(start <= end, NULL);
+ g_return_val_if_fail(object_found != NULL, NULL);
+
+ /* open the cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->object_db);
+ if (cursor) {
+ /* TODO: retrieve list of alarms for this object */
+
+ /* create the CORBA alarms */
+ corba_alarms = GNOME_Evolution_Calendar_CalComponentAlarms__alloc();
+
+ /* TODO: populate the CORBA alarms */
+ }
+
+ return corba_alarms;
+}
+
+/* update_object handler for the DB backend */
+static gboolean
+cal_backend_db_update_object (CalBackend *backend, const char *uid, const char *calobj)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), FALSE);
+ g_return_val_if_fail(cbdb->priv != NULL, FALSE);
+ g_return_val_if_fail(uid != NULL, FALSE);
+ g_return_val_if_fail(calobj != NULL, FALSE);
+
+ /* open the cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ DBT *data;
+
+ data = find_record_by_id(cursor, uid);
+ if (data) {
+ DBT key;
+ DBT new_data;
+ int ret;
+
+ /* try to change the value in the cursor */
+ memset(&key, 0, sizeof(key));
+ key.data = (void *) uid;
+ key.size = strlen(uid); // + 1
+
+ memset(&new_data, 0, sizeof(new_data));
+ new_data.data = (void *) calobj;
+ new_data.size = strlen(calobj); // + 1
+
+ /* move the cursor to the given key */
+ if ((ret = cursor->dbc->c_get(cursor->dbc, &key, NULL, DB_FIRST)) != 0) {
+ return FALSE;
+ }
+
+ /* TODO: start transaction */
+
+ if ((ret = cursor->dbc->c_put(cursor->dbc, &key, &new_data, DB_CURRENT)) != 0) {
+ /* TODO: rollback transaction */
+ return FALSE;
+ }
+
+ /* TODO: update history database */
+ /* TODO: commit transaction */
+
+ memcpy(data, &new_data, sizeof(new_data));
+
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+/* remove_object handler for the DB backend */
+static gboolean
+cal_backend_db_remove_object (CalBackend *backend, const char *uid)
+{
+ CalBackendDB *cbdb;
+ CalBackendDBCursor *cursor;
+
+ cbdb = CAL_BACKEND_DB(backend);
+ g_return_val_if_fail(IS_CAL_BACKEND_DB(cbdb), FALSE);
+ g_return_val_if_fail(cbdb->priv != NULL, FALSE);
+ g_return_val_if_fail(uid != NULL, FALSE);
+
+ /* open cursor */
+ cursor = open_cursor(cbdb, cbdb->priv->objects_db);
+ if (cursor) {
+ DBT *data = find_record_by_id(cursor, uid);
+ if (data) {
+ GList *l;
+ int ret;
+ DBT key;
+
+ memset(&key, 0, sizeof(key);
+ key.data = (void *) uid;
+ key.size = strlen(uid); // + 1
+
+ if ((ret = cursor->dbc->c_get(cursor->dbc, &key, NULL, DB_FIRST)) != 0) {
+ return FALSE;
+ }
+
+ /* TODO: begin transaction */
+
+ /* remove record from cursor */
+ if ((ret = cursor->dbc->c_del(cursor->dbc, 0)) != 0) {
+ /* TODO: rollback transaction */
+ return FALSE;
+ }
+
+ /* TODO: update history database */
+ /* TODO: commit transaction */
+
+ /* remove record from in-memory lists */
+ l = g_list_nth(cursor->keys,
+ g_list_index(cursor->data, (gpointer) data));
+ if (l) {
+ DBT *key_to_free = (DBT *) l->data;
+
+ cursor->keys = g_list_remove(cursor->keys, (gpointer) key_to_free);
+ g_free((gpointer) key_to_free);
+
+ cursor->data = g_list_remove(cursor->data, (gpointer) data);
+ g_free((gpointer) data);
+ }
+
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}