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 #include "gioalias.h"
  34
  35 enum
  36 {
  37   PROP_0,
  38   PROP_FILENAME,
  39   PROP_FLAGS
  40 };
  41
  42 G_DEFINE_ABSTRACT_TYPE (GLocalFileMonitor, g_local_file_monitor, G_TYPE_FILE_MONITOR)
  43
  44 static void
  45 g_local_file_monitor_init (GLocalFileMonitor* local_monitor)
  46 {
  47 }
  48
  49 static void
  50 g_local_file_monitor_set_property (GObject      *object,
  51                                    guint         property_id,
  52                                    const GValue *value,
  53                                    GParamSpec   *pspec)
  54 {
  55   switch (property_id)
  56   {
  57     case PROP_FILENAME:
  58       /* Do nothing */
  59       break;
  60     case PROP_FLAGS:
  61       /* Do nothing as well */
  62       break;
  63     default:
  64       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  65       break;
  66   }
  67 }
  68
  69 static GObject *
  70 g_local_file_monitor_constructor (GType                  type,
  71                                   guint                  n_construct_properties,
  72                                   GObjectConstructParam *construct_properties)
  73 {
  74   GObject *obj;
  75   GLocalFileMonitorClass *klass;
  76   GObjectClass *parent_class;
  77   GLocalFileMonitor *local_monitor;
  78   const gchar *filename = NULL;
  79   GFileMonitorFlags flags = 0;
  80   gint i;
  81
  82   klass = G_LOCAL_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_FILE_MONITOR));
  83   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  84   obj = parent_class->constructor (type,
  85                                    n_construct_properties,
  86                                    construct_properties);
  87
  88   local_monitor = G_LOCAL_FILE_MONITOR (obj);
  89
  90   for (i = 0; i < n_construct_properties; i++)
  91     {
  92       if (strcmp ("filename", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
  93         {
  94           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
  95           filename = g_value_get_string (construct_properties[i].value);
  96         }
  97       else if (strcmp ("flags", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
  98         {
  99           g_warn_if_fail (G_VALUE_HOLDS_FLAGS (construct_properties[i].value));
 100           flags = g_value_get_flags (construct_properties[i].value);
 101         }
 102     }
 103
 104   g_warn_if_fail (filename != NULL);
 105
 106   local_monitor->filename = g_strdup (filename);
 107   local_monitor->flags = flags;
 108   return obj;
 109 }
 110
 111 static void
 112 g_local_file_monitor_finalize (GObject *object)
 113 {
 114   GLocalFileMonitor *local_monitor = G_LOCAL_FILE_MONITOR (object);
 115   if (local_monitor->filename)
 116     {
 117       g_free (local_monitor->filename);
 118       local_monitor->filename = NULL;
 119     }
 120
 121   G_OBJECT_CLASS (g_local_file_monitor_parent_class)->finalize (object);
 122 }
 123
 124 static void g_local_file_monitor_class_init (GLocalFileMonitorClass *klass)
 125 {
 126   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 127
 128   gobject_class->set_property = g_local_file_monitor_set_property;
 129   gobject_class->finalize = g_local_file_monitor_finalize;
 130   gobject_class->constructor = g_local_file_monitor_constructor;
 131
 132   g_object_class_install_property (gobject_class,
 133                                    PROP_FILENAME,
 134                                    g_param_spec_string ("filename",
 135                                                         P_("File name"),
 136                                                         P_("File name to monitor"),
 137                                                         NULL,
 138                                                         G_PARAM_CONSTRUCT_ONLY|
 139                                                         G_PARAM_WRITABLE|
 140                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 141
 142   g_object_class_install_property (gobject_class,
 143                                    PROP_FLAGS,
 144                                    g_param_spec_flags ("flags",
 145                                                        P_("Monitor flags"),
 146                                                        P_("Monitor flags"),
 147                                                        G_TYPE_FILE_MONITOR_FLAGS,
 148                                                        0,
 149                                                        G_PARAM_CONSTRUCT_ONLY|
 150                                                        G_PARAM_WRITABLE|
 151                                                        G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 152 }
 153
 154 static gpointer
 155 get_default_local_file_monitor (gpointer data)
 156 {
 157   GLocalFileMonitorClass *chosen_class;
 158   GLocalFileMonitorClass **ret = data;
 159   GIOExtensionPoint *ep;
 160   GList *extensions, *l;
 161
 162   _g_io_modules_ensure_loaded ();
 163
 164   ep = g_io_extension_point_lookup (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME);
 165
 166   extensions = g_io_extension_point_get_extensions (ep);
 167
 168   chosen_class = NULL;
 169   for (l = extensions; l != NULL; l = l->next)
 170     {
 171       GIOExtension *extension = l->data;
 172       GLocalFileMonitorClass *klass;
 173
 174       klass = G_LOCAL_FILE_MONITOR_CLASS (g_io_extension_ref_class (extension));
 175
 176       if (klass->is_supported ())
 177         {
 178           chosen_class = klass;
 179           break;
 180         }
 181       else
 182         g_type_class_unref (klass);
 183     }
 184
 185   if (chosen_class)
 186     {
 187       *ret = chosen_class;
 188       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 189     }
 190   else
 191     return (gpointer)G_TYPE_INVALID;
 192 }
 193
 194 GFileMonitor*
 195 _g_local_file_monitor_new (const char         *pathname,
 196                            GFileMonitorFlags   flags,
 197                            GError            **error)
 198 {
 199   static GOnce once_init = G_ONCE_INIT;
 200   GTypeClass *type_class;
 201   GFileMonitor *monitor;
 202   GType type;
 203
 204   type_class = NULL;
 205   g_once (&once_init, get_default_local_file_monitor, &type_class);
 206   type = (GType)once_init.retval;
 207
 208   monitor = NULL;
 209   if (type != G_TYPE_INVALID)
 210     monitor = G_FILE_MONITOR (g_object_new (type, "filename", pathname, "flags", flags, NULL));
 211   else
 212     g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 213                          _("Unable to find default local file monitor type"));
 214
 215   /* This is non-null on first pass here. Unref the class now.
 216    * This is to avoid unloading the module and then loading it
 217    * again which would happen if we unrefed the class
 218    * before creating the monitor.
 219    */
 220
 221   if (type_class)
 222     g_type_class_unref (type_class);
 223
 224   return monitor;
 225 }
 226
 227 #define __G_LOCAL_FILE_MONITOR_C__
 228 #include "gioaliasdef.c"