gio/fen/gfenfilemonitor.c

   1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* vim:set expandtab ts=4 shiftwidth=4: */
   3 /* GIO - GLib Input, Output and Streaming Library
   4  *
   5  * Copyright (C) 2006-2007 Red Hat, Inc.
   6  * Copyright (C) 2007 Sebastian Dröge.
   7  * Copyright (c) 2008, 2010 Oracle and/or its affiliates, Inc. All rights
   8  * reserved.
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General
  21  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22  *
  23  * Authors: Alexander Larsson <alexl@redhat.com>
  24  *          John McCutchan <john@johnmccutchan.com>
  25  *          Sebastian Dröge <slomo@circular-chaos.org>
  26  *          Lin Ma <lin.ma@sun.com>
  27  */
  28
  29 #include "config.h"
  30
  31 #include "gfenfilemonitor.h"
  32 #include <gio/giomodule.h>
  33
  34 #include "fen-helper.h"
  35
  36 struct _GFenFileMonitor
  37 {
  38     GLocalFileMonitor parent_instance;
  39     gboolean enabled;
  40 };
  41
  42 static gboolean g_fen_file_monitor_cancel (GFileMonitor* monitor);
  43
  44 #define g_fen_file_monitor_get_type _g_fen_file_monitor_get_type
  45 G_DEFINE_TYPE_WITH_CODE (GFenFileMonitor, g_fen_file_monitor, G_TYPE_LOCAL_FILE_MONITOR,
  46   g_io_extension_point_implement (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME,
  47     g_define_type_id,
  48     "fen",
  49     20))
  50
  51 static void
  52 g_fen_file_monitor_finalize (GObject *object)
  53 {
  54     GFenFileMonitor *self = G_FEN_FILE_MONITOR (object);
  55
  56     if (self->enabled) {
  57         fen_remove (G_LOCAL_FILE_MONITOR (self)->filename, self, FALSE);
  58         self->enabled = FALSE;
  59     }
  60
  61     if (G_OBJECT_CLASS (g_fen_file_monitor_parent_class)->finalize)
  62         (*G_OBJECT_CLASS (g_fen_file_monitor_parent_class)->finalize) (object);
  63 }
  64
  65 static GObject *
  66 g_fen_file_monitor_constructor (GType type,
  67   guint n_construct_properties,
  68   GObjectConstructParam *construct_properties)
  69 {
  70     GObject *obj;
  71     GFenFileMonitorClass *klass;
  72     GObjectClass *parent_class;
  73     GFenFileMonitor *self;
  74     const gchar *filename = NULL;
  75
  76     klass = G_FEN_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_FEN_FILE_MONITOR));
  77     parent_class = g_fen_file_monitor_parent_class;
  78     obj = parent_class->constructor (type,
  79       n_construct_properties,
  80       construct_properties);
  81
  82     self = G_FEN_FILE_MONITOR (obj);
  83
  84     filename = G_LOCAL_FILE_MONITOR (obj)->filename;
  85
  86     g_assert (filename != NULL);
  87
  88     /* Will never fail as is_supported() should be called before instanciating
  89      * anyway */
  90     if (!fen_init ())
  91         g_assert_not_reached ();
  92
  93     /* FIXME: what to do about errors here? we can't return NULL or another
  94      * kind of error and an assertion is probably too hard */
  95     fen_add (filename, self, FALSE);
  96     self->enabled = TRUE;
  97
  98     return obj;
  99 }
 100
 101 static gboolean
 102 g_fen_file_monitor_is_supported (void)
 103 {
 104     return fen_init ();
 105 }
 106
 107 static void
 108 g_fen_file_monitor_class_init (GFenFileMonitorClass* klass)
 109 {
 110     GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
 111     GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
 112     GLocalFileMonitorClass *local_file_monitor_class = G_LOCAL_FILE_MONITOR_CLASS (klass);
 113
 114     gobject_class->finalize = g_fen_file_monitor_finalize;
 115     gobject_class->constructor = g_fen_file_monitor_constructor;
 116     file_monitor_class->cancel = g_fen_file_monitor_cancel;
 117
 118     local_file_monitor_class->is_supported = g_fen_file_monitor_is_supported;
 119 }
 120
 121 static void
 122 g_fen_file_monitor_init (GFenFileMonitor* monitor)
 123 {
 124 }
 125
 126 static gboolean
 127 g_fen_file_monitor_cancel (GFileMonitor* monitor)
 128 {
 129     GFenFileMonitor *self = G_FEN_FILE_MONITOR (monitor);
 130
 131     if (self->enabled) {
 132         fen_remove (G_LOCAL_FILE_MONITOR (self)->filename, self, FALSE);
 133         self->enabled = FALSE;
 134     }
 135
 136     if (G_FILE_MONITOR_CLASS (g_fen_file_monitor_parent_class)->cancel)
 137         (*G_FILE_MONITOR_CLASS (g_fen_file_monitor_parent_class)->cancel) (monitor);
 138
 139     return TRUE;
 140 }