glib/gio/fen/gfenfilemonitor.c

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set expandtab ts=4 shiftwidth=4: */
/* GIO - GLib Input, Output and Streaming Library
 * 
 * Copyright (C) 2006-2007 Red Hat, Inc.
 * Copyright (C) 2007 Sebastian Dröge.
 * Copyright (c) 2008, 2010 Oracle and/or its affiliates, Inc. All rights
 * reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Alexander Larsson <alexl@redhat.com>
 *          John McCutchan <john@johnmccutchan.com> 
 *          Sebastian Dröge <slomo@circular-chaos.org>
 *          Lin Ma <lin.ma@sun.com>
 */

#include "config.h"

#include "gfenfilemonitor.h"
#include <gio/giomodule.h>

#include "fen-helper.h"

struct _GFenFileMonitor
{
    GLocalFileMonitor parent_instance;
    gboolean enabled;
};

static gboolean g_fen_file_monitor_cancel (GFileMonitor* monitor);

#define g_fen_file_monitor_get_type _g_fen_file_monitor_get_type
G_DEFINE_TYPE_WITH_CODE (GFenFileMonitor, g_fen_file_monitor, G_TYPE_LOCAL_FILE_MONITOR,
  g_io_extension_point_implement (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME,
    g_define_type_id,
    "fen",
    20))

static void
g_fen_file_monitor_finalize (GObject *object)
{
    GFenFileMonitor *self = G_FEN_FILE_MONITOR (object);
    
    if (self->enabled) {
        fen_remove (G_LOCAL_FILE_MONITOR (self)->filename, self, FALSE);
        self->enabled = FALSE;
    }
    
    if (G_OBJECT_CLASS (g_fen_file_monitor_parent_class)->finalize)
        (*G_OBJECT_CLASS (g_fen_file_monitor_parent_class)->finalize) (object);
}

static GObject *
g_fen_file_monitor_constructor (GType type,
  guint n_construct_properties,
  GObjectConstructParam *construct_properties)
{
    GObject *obj;
    GFenFileMonitorClass *klass;
    GObjectClass *parent_class;
    GFenFileMonitor *self;
    const gchar *filename = NULL;
  
    klass = G_FEN_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_FEN_FILE_MONITOR));
    parent_class = g_fen_file_monitor_parent_class;
    obj = parent_class->constructor (type,
      n_construct_properties,
      construct_properties);

    self = G_FEN_FILE_MONITOR (obj);

    filename = G_LOCAL_FILE_MONITOR (obj)->filename;

    g_assert (filename != NULL);

    /* Will never fail as is_supported() should be called before instanciating
     * anyway */
    if (!fen_init ())
        g_assert_not_reached ();
    
    /* FIXME: what to do about errors here? we can't return NULL or another
     * kind of error and an assertion is probably too hard */
    fen_add (filename, self, FALSE);
    self->enabled = TRUE;

    return obj;
}

static gboolean
g_fen_file_monitor_is_supported (void)
{
    return fen_init ();
}

static void
g_fen_file_monitor_class_init (GFenFileMonitorClass* klass)
{
    GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
    GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
    GLocalFileMonitorClass *local_file_monitor_class = G_LOCAL_FILE_MONITOR_CLASS (klass);
  
    gobject_class->finalize = g_fen_file_monitor_finalize;
    gobject_class->constructor = g_fen_file_monitor_constructor;
    file_monitor_class->cancel = g_fen_file_monitor_cancel;

    local_file_monitor_class->is_supported = g_fen_file_monitor_is_supported;
}

static void
g_fen_file_monitor_init (GFenFileMonitor* monitor)
{
}

static gboolean
g_fen_file_monitor_cancel (GFileMonitor* monitor)
{
    GFenFileMonitor *self = G_FEN_FILE_MONITOR (monitor);
    
    if (self->enabled) {
        fen_remove (G_LOCAL_FILE_MONITOR (self)->filename, self, FALSE);
        self->enabled = FALSE;
    }
    
    if (G_FILE_MONITOR_CLASS (g_fen_file_monitor_parent_class)->cancel)
        (*G_FILE_MONITOR_CLASS (g_fen_file_monitor_parent_class)->cancel) (monitor);

    return TRUE;
}