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 "glocalfilemonitor.h"
  26 #include "giomodule-priv.h"
  27 #include "gioerror.h"
  28 #include "glibintl.h"
  29
  30 #include <string.h>
  31
  32 #include "gioalias.h"
  33
  34 enum
  35 {
  36   PROP_0,
  37   PROP_FILENAME
  38 };
  39
  40 G_DEFINE_ABSTRACT_TYPE (GLocalFileMonitor, g_local_file_monitor, G_TYPE_FILE_MONITOR)
  41
  42 static void
  43 g_local_file_monitor_init (GLocalFileMonitor* local_monitor)
  44 {
  45 }
  46
  47 static void
  48 g_local_file_monitor_set_property (GObject      *object,
  49                                    guint         property_id,
  50                                    const GValue *value,
  51                                    GParamSpec   *pspec)
  52 {
  53   switch (property_id)
  54   {
  55     case PROP_FILENAME:
  56       /* Do nothing */
  57       break;
  58     default:
  59       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  60       break;
  61   }
  62 }
  63
  64 static GObject *
  65 g_local_file_monitor_constructor (GType                  type,
  66                                   guint                  n_construct_properties,
  67                                   GObjectConstructParam *construct_properties)
  68 {
  69   GObject *obj;
  70   GLocalFileMonitorClass *klass;
  71   GObjectClass *parent_class;
  72   GLocalFileMonitor *local_monitor;
  73   const gchar *filename = NULL;
  74   gint i;
  75
  76   klass = G_LOCAL_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_FILE_MONITOR));
  77   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  78   obj = parent_class->constructor (type,
  79                                    n_construct_properties,
  80                                    construct_properties);
  81
  82   local_monitor = G_LOCAL_FILE_MONITOR (obj);
  83
  84   for (i = 0; i < n_construct_properties; i++)
  85     {
  86       if (strcmp ("filename", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
  87         {
  88           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
  89           filename = g_value_get_string (construct_properties[i].value);
  90           break;
  91         }
  92     }
  93
  94   g_warn_if_fail (filename != NULL);
  95
  96   local_monitor->filename = g_strdup (filename);
  97   return obj;
  98 }
  99
 100 static void
 101 g_local_file_monitor_finalize (GObject *object)
 102 {
 103   GLocalFileMonitor *local_monitor = G_LOCAL_FILE_MONITOR (object);
 104   if (local_monitor->filename)
 105     {
 106       g_free (local_monitor->filename);
 107       local_monitor->filename = NULL;
 108     }
 109
 110   G_OBJECT_CLASS (g_local_file_monitor_parent_class)->finalize (object);
 111 }
 112
 113 static void g_local_file_monitor_class_init (GLocalFileMonitorClass *klass)
 114 {
 115   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 116
 117   gobject_class->set_property = g_local_file_monitor_set_property;
 118   gobject_class->finalize = g_local_file_monitor_finalize;
 119   gobject_class->constructor = g_local_file_monitor_constructor;
 120
 121   g_object_class_install_property (gobject_class,
 122                                    PROP_FILENAME,
 123                                    g_param_spec_string ("filename",
 124                                                         P_("File name"),
 125                                                         P_("File name to monitor"),
 126                                                         NULL,
 127                                                         G_PARAM_CONSTRUCT_ONLY|
 128                                                         G_PARAM_WRITABLE|
 129                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 130 }
 131
 132 static gpointer
 133 get_default_local_file_monitor (gpointer data)
 134 {
 135   GLocalFileMonitorClass *chosen_class;
 136   GLocalFileMonitorClass **ret = data;
 137   GIOExtensionPoint *ep;
 138   GList *extensions, *l;
 139
 140   _g_io_modules_ensure_loaded ();
 141
 142   ep = g_io_extension_point_lookup (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME);
 143
 144   extensions = g_io_extension_point_get_extensions (ep);
 145
 146   chosen_class = NULL;
 147   for (l = extensions; l != NULL; l = l->next)
 148     {
 149       GIOExtension *extension = l->data;
 150       GLocalFileMonitorClass *klass;
 151
 152       klass = G_LOCAL_FILE_MONITOR_CLASS (g_io_extension_ref_class (extension));
 153
 154       if (klass->is_supported ())
 155         {
 156           chosen_class = klass;
 157           break;
 158         }
 159       else
 160         g_type_class_unref (klass);
 161     }
 162
 163   if (chosen_class)
 164     {
 165       *ret = chosen_class;
 166       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 167     }
 168   else
 169     return (gpointer)G_TYPE_INVALID;
 170 }
 171
 172 /**
 173  * g_local_file_monitor_new:
 174  * @pathname: path name to monitor.
 175  * @flags: #GFileMonitorFlags.
 176  *
 177  * Returns: a new #GFileMonitor for the given @pathname.
 178  **/
 179 GFileMonitor*
 180 _g_local_file_monitor_new (const char         *pathname,
 181                            GFileMonitorFlags   flags,
 182                            GError            **error)
 183 {
 184   static GOnce once_init = G_ONCE_INIT;
 185   GTypeClass *type_class;
 186   GFileMonitor *monitor;
 187   GType type;
 188
 189   type_class = NULL;
 190   g_once (&once_init, get_default_local_file_monitor, &type_class);
 191   type = (GType)once_init.retval;
 192
 193   monitor = NULL;
 194   if (type != G_TYPE_INVALID)
 195     monitor = G_FILE_MONITOR (g_object_new (type, "filename", pathname, NULL));
 196   else
 197     g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 198                          _("Unable to find default local file monitor type"));
 199
 200   /* This is non-null on first pass here. Unref the class now.
 201    * This is to avoid unloading the module and then loading it
 202    * again which would happen if we unrefed the class
 203    * before creating the monitor.
 204    */
 205
 206   if (type_class)
 207     g_type_class_unref (type_class);
 208
 209   return monitor;
 210 }
 211
 212 #define __G_LOCAL_FILE_MONITOR_C__
 213 #include "gioaliasdef.c"