/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Evolution calendar - generic backend class
*
* Copyright (C) 2000 Helix Code, Inc.
* Copyright (C) 2000 Ximian, Inc.
*
* Authors: Federico Mena-Quintero <federico@ximian.com>
* JP Rosevear <jpr@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 <gtk/gtksignal.h>
#include <gnome-xml/parser.h>
#include <gnome-xml/parserInternals.h>
#include <gnome-xml/xmlmemory.h>
#include "cal-backend.h"
#include "libversit/vcc.h"
/* Signal IDs */
enum {
LAST_CLIENT_GONE,
OPENED,
OBJ_UPDATED,
OBJ_REMOVED,
LAST_SIGNAL
};
static void cal_backend_class_init (CalBackendClass *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) NULL,
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;
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);
cal_backend_signals[OPENED] =
gtk_signal_new ("opened",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (CalBackendClass, opened),
gtk_marshal_NONE__ENUM,
GTK_TYPE_NONE, 1,
GTK_TYPE_ENUM);
cal_backend_signals[OBJ_UPDATED] =
gtk_signal_new ("obj_updated",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (CalBackendClass, obj_updated),
gtk_marshal_NONE__STRING,
GTK_TYPE_NONE, 1,
GTK_TYPE_STRING);
cal_backend_signals[OBJ_REMOVED] =
gtk_signal_new ("obj_removed",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (CalBackendClass, obj_removed),
gtk_marshal_NONE__STRING,
GTK_TYPE_NONE, 1,
GTK_TYPE_STRING);
gtk_object_class_add_signals (object_class, cal_backend_signals, LAST_SIGNAL);
class->last_client_gone = NULL;
class->opened = NULL;
class->obj_updated = NULL;
class->obj_removed = NULL;
class->get_uri = NULL;
class->add_cal = NULL;
class->open = NULL;
class->get_n_objects = NULL;
class->get_object = NULL;
class->get_type_by_uid = NULL;
class->get_uids = NULL;
class->get_objects_in_range = NULL;
class->get_changes = NULL;
class->get_alarms_in_range = NULL;
class->get_alarms_for_object = NULL;
class->update_object = NULL;
class->remove_object = NULL;
}
/**
* cal_backend_get_uri:
* @backend: A calendar backend.
*
* Queries the URI of a calendar backend, which must already have an open
* 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);
}
/**
* 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 an open 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_open:
* @backend: A calendar backend.
* @uri: URI that contains the calendar data.
* @only_if_exists: Whether the calendar should be opened only if it already
* exists. If FALSE, a new calendar will be created when the specified @uri
* does not exist.
*
* Opens a calendar backend with data from a calendar stored at the specified
* URI.
*
* Return value: An operation status code.
**/
CalBackendOpenStatus
cal_backend_open (CalBackend *backend, GnomeVFSURI *uri, gboolean only_if_exists)
{
CalBackendOpenStatus result;
g_return_val_if_fail (backend != NULL, CAL_BACKEND_OPEN_ERROR);
g_return_val_if_fail (IS_CAL_BACKEND (backend), CAL_BACKEND_OPEN_ERROR);
g_return_val_if_fail (uri != NULL, CAL_BACKEND_OPEN_ERROR);
g_assert (CLASS (backend)->open != NULL);
result = (* CLASS (backend)->open) (backend, uri, only_if_exists);
return result;
}
/**
* cal_backend_is_loaded:
* @backend: A calendar backend.
*
* Queries whether a calendar backend has been loaded yet.
*
* Return value: TRUE if the backend has been loaded with data, FALSE otherwise.
**/
gboolean
cal_backend_is_loaded (CalBackend *backend)
{
gboolean result;
g_return_val_if_fail (backend != NULL, FALSE);
g_return_val_if_fail (IS_CAL_BACKEND (backend), FALSE);
g_assert (CLASS (backend)->is_loaded != NULL);
result = (* CLASS (backend)->is_loaded) (backend);
return result;
}
/**
* 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);
}
/**
* 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_changes:
* @backend: A calendar backend
* @type: Bitmask with types of objects to return.
* @change_id: A unique uid for the callers change list
*
* Builds a sequence of objects and the type of change that occurred on them since
* the last time the give change_id was seen
*
* Return value: A list of the objects that changed and the type of change
**/
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);
g_return_val_if_fail (change_id != NULL, NULL);
g_assert (CLASS (backend)->get_changes != NULL);
return (* CLASS (backend)->get_changes) (backend, type, change_id);
}
/**
* cal_backend_get_alarms_in_range:
* @backend: A calendar backend.
* @start: Start time for query.
* @end: End time for query.
* @valid_range: Return value that says whether the range is valid or not.
*
* Builds a sorted list of the alarms that trigger in the specified time range.
*
* Return value: A sequence of component alarm instances structures, or NULL
* if @valid_range returns FALSE.
**/
GNOME_Evolution_Calendar_CalComponentAlarmsSeq *
cal_backend_get_alarms_in_range (CalBackend *backend, time_t start, time_t end, gboolean *valid_range)
{
g_return_val_if_fail (backend != NULL, NULL);
g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL);
g_return_val_if_fail (valid_range != NULL, NULL);
g_assert (CLASS (backend)->get_alarms_in_range != NULL);
if (!(start != -1 && end != -1 && start <= end)) {
*valid_range = FALSE;
return NULL;
} else {
*valid_range = TRUE;
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.
* @result: Return value for the result code for the operation.
*
* Builds a sorted list of the alarms of the specified event that trigger in a
* particular time range.
*
* Return value: A structure of the component's alarm instances, or NULL if @result
* returns something other than #CAL_BACKEND_GET_ALARMS_SUCCESS.
**/
GNOME_Evolution_Calendar_CalComponentAlarms *
cal_backend_get_alarms_for_object (CalBackend *backend, const char *uid,
time_t start, time_t end,
CalBackendGetAlarmsForObjectResult *result)
{
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_return_val_if_fail (result != NULL, NULL);
g_assert (CLASS (backend)->get_alarms_for_object != NULL);
if (!(start != -1 && end != -1 && start <= end)) {
*result = CAL_BACKEND_GET_ALARMS_INVALID_RANGE;
return NULL;
} else {
gboolean object_found;
GNOME_Evolution_Calendar_CalComponentAlarms *alarms;
alarms = (* CLASS (backend)->get_alarms_for_object) (backend, uid, start, end,
&object_found);
if (object_found)
*result = CAL_BACKEND_GET_ALARMS_SUCCESS;
else
*result = CAL_BACKEND_GET_ALARMS_NOT_FOUND;
return 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]);
}
/**
* cal_backend_opened:
* @backend: A calendar backend.
* @status: Open status code.
*
* Emits the "opened" signal of a calendar backend. This function is to be used
* only by backend implementations.
**/
void
cal_backend_opened (CalBackend *backend, CalBackendOpenStatus status)
{
g_return_if_fail (backend != NULL);
g_return_if_fail (IS_CAL_BACKEND (backend));
gtk_signal_emit (GTK_OBJECT (backend), cal_backend_signals[OPENED],
status);
}
/**
* cal_backend_obj_updated:
* @backend: A calendar backend.
* @uid: Unique identifier of the component that was updated.
*
* Emits the "obj_updated" signal of a calendar backend. This function is to be
* used only by backend implementations.
**/
void
cal_backend_obj_updated (CalBackend *backend, const char *uid)
{
g_return_if_fail (backend != NULL);
g_return_if_fail (IS_CAL_BACKEND (backend));
g_return_if_fail (uid != NULL);
gtk_signal_emit (GTK_OBJECT (backend), cal_backend_signals[OBJ_UPDATED],
uid);
}
/**
* cal_backend_obj_removed:
* @backend: A calendar backend.
* @uid: Unique identifier of the component that was removed.
*
* Emits the "obj_removed" signal of a calendar backend. This function is to be
* used only by backend implementations.
**/
void
cal_backend_obj_removed (CalBackend *backend, const char *uid)
{
g_return_if_fail (backend != NULL);
g_return_if_fail (IS_CAL_BACKEND (backend));
g_return_if_fail (uid != NULL);
gtk_signal_emit (GTK_OBJECT (backend), cal_backend_signals[OBJ_REMOVED],
uid);
}
