gio/glocalfilemonitor.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gioenumtypes.h"
  26 #include "glocalfilemonitor.h"
  27 #include "giomodule-priv.h"
  28 #include "gioerror.h"
  29 #include "glibintl.h"
  30
  31 #include <string.h>
  32
  33
  34 enum
  35 {
  36   PROP_0,
  37   PROP_FILENAME,
  38   PROP_FLAGS
  39 };
  40
  41 G_DEFINE_ABSTRACT_TYPE (GLocalFileMonitor, g_local_file_monitor, G_TYPE_FILE_MONITOR)
  42
  43 static void
  44 g_local_file_monitor_init (GLocalFileMonitor* local_monitor)
  45 {
  46 }
  47
  48 static void
  49 g_local_file_monitor_set_property (GObject      *object,
  50                                    guint         property_id,
  51                                    const GValue *value,
  52                                    GParamSpec   *pspec)
  53 {
  54   switch (property_id)
  55   {
  56     case PROP_FILENAME:
  57       /* Do nothing */
  58       break;
  59     case PROP_FLAGS:
  60       /* Do nothing as well */
  61       break;
  62     default:
  63       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  64       break;
  65   }
  66 }
  67
  68 static GObject *
  69 g_local_file_monitor_constructor (GType                  type,
  70                                   guint                  n_construct_properties,
  71                                   GObjectConstructParam *construct_properties)
  72 {
  73   GObject *obj;
  74   GLocalFileMonitorClass *klass;
  75   GObjectClass *parent_class;
  76   GLocalFileMonitor *local_monitor;
  77   const gchar *filename = NULL;
  78   GFileMonitorFlags flags = 0;
  79   gint i;
  80
  81   klass = G_LOCAL_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_FILE_MONITOR));
  82   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  83   obj = parent_class->constructor (type,
  84                                    n_construct_properties,
  85                                    construct_properties);
  86
  87   local_monitor = G_LOCAL_FILE_MONITOR (obj);
  88
  89   for (i = 0; i < n_construct_properties; i++)
  90     {
  91       if (strcmp ("filename", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
  92         {
  93           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
  94           filename = g_value_get_string (construct_properties[i].value);
  95         }
  96       else if (strcmp ("flags", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
  97         {
  98           g_warn_if_fail (G_VALUE_HOLDS_FLAGS (construct_properties[i].value));
  99           flags = g_value_get_flags (construct_properties[i].value);
 100         }
 101     }
 102
 103   g_warn_if_fail (filename != NULL);
 104
 105   local_monitor->filename = g_strdup (filename);
 106   local_monitor->flags = flags;
 107   return obj;
 108 }
 109
 110 static void
 111 g_local_file_monitor_finalize (GObject *object)
 112 {
 113   GLocalFileMonitor *local_monitor = G_LOCAL_FILE_MONITOR (object);
 114   if (local_monitor->filename)
 115     {
 116       g_free (local_monitor->filename);
 117       local_monitor->filename = NULL;
 118     }
 119
 120   G_OBJECT_CLASS (g_local_file_monitor_parent_class)->finalize (object);
 121 }
 122
 123 static void g_local_file_monitor_class_init (GLocalFileMonitorClass *klass)
 124 {
 125   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 126
 127   gobject_class->set_property = g_local_file_monitor_set_property;
 128   gobject_class->finalize = g_local_file_monitor_finalize;
 129   gobject_class->constructor = g_local_file_monitor_constructor;
 130
 131   g_object_class_install_property (gobject_class,
 132                                    PROP_FILENAME,
 133                                    g_param_spec_string ("filename",
 134                                                         P_("File name"),
 135                                                         P_("File name to monitor"),
 136                                                         NULL,
 137                                                         G_PARAM_CONSTRUCT_ONLY|
 138                                                         G_PARAM_WRITABLE|
 139                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 140
 141   g_object_class_install_property (gobject_class,
 142                                    PROP_FLAGS,
 143                                    g_param_spec_flags ("flags",
 144                                                        P_("Monitor flags"),
 145                                                        P_("Monitor flags"),
 146                                                        G_TYPE_FILE_MONITOR_FLAGS,
 147                                                        0,
 148                                                        G_PARAM_CONSTRUCT_ONLY|
 149                                                        G_PARAM_WRITABLE|
 150                                                        G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 151 }
 152
 153 static gpointer
 154 get_default_local_file_monitor (gpointer data)
 155 {
 156   GLocalFileMonitorClass *chosen_class;
 157   GLocalFileMonitorClass **ret = data;
 158   GIOExtensionPoint *ep;
 159   GList *extensions, *l;
 160
 161   _g_io_modules_ensure_loaded ();
 162
 163   ep = g_io_extension_point_lookup (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME);
 164
 165   extensions = g_io_extension_point_get_extensions (ep);
 166
 167   chosen_class = NULL;
 168   for (l = extensions; l != NULL; l = l->next)
 169     {
 170       GIOExtension *extension = l->data;
 171       GLocalFileMonitorClass *klass;
 172
 173       klass = G_LOCAL_FILE_MONITOR_CLASS (g_io_extension_ref_class (extension));
 174
 175       if (klass->is_supported ())
 176         {
 177           chosen_class = klass;
 178           break;
 179         }
 180       else
 181         g_type_class_unref (klass);
 182     }
 183
 184   if (chosen_class)
 185     {
 186       *ret = chosen_class;
 187       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 188     }
 189   else
 190     return (gpointer)G_TYPE_INVALID;
 191 }
 192
 193 GFileMonitor*
 194 _g_local_file_monitor_new (const char         *pathname,
 195                            GFileMonitorFlags   flags,
 196                            GError            **error)
 197 {
 198   static GOnce once_init = G_ONCE_INIT;
 199   GTypeClass *type_class;
 200   GFileMonitor *monitor;
 201   GType type;
 202
 203   type_class = NULL;
 204   g_once (&once_init, get_default_local_file_monitor, &type_class);
 205   type = (GType)once_init.retval;
 206
 207   monitor = NULL;
 208   if (type != G_TYPE_INVALID)
 209     monitor = G_FILE_MONITOR (g_object_new (type, "filename", pathname, "flags", flags, NULL));
 210   else
 211     g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 212                          _("Unable to find default local file monitor type"));
 213
 214   /* This is non-null on first pass here. Unref the class now.
 215    * This is to avoid unloading the module and then loading it
 216    * again which would happen if we unrefed the class
 217    * before creating the monitor.
 218    */
 219
 220   if (type_class)
 221     g_type_class_unref (type_class);
 222
 223   return monitor;
 224 }