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 "glibintl.h"
  28
  29 #include <string.h>
  30
  31 #include "gioalias.h"
  32
  33 enum
  34 {
  35   PROP_0,
  36   PROP_FILENAME
  37 };
  38
  39 G_DEFINE_ABSTRACT_TYPE (GLocalFileMonitor, g_local_file_monitor, G_TYPE_FILE_MONITOR)
  40
  41 static void
  42 g_local_file_monitor_init (GLocalFileMonitor* local_monitor)
  43 {
  44 }
  45
  46 static void
  47 g_local_file_monitor_set_property (GObject      *object,
  48                                    guint         property_id,
  49                                    const GValue *value,
  50                                    GParamSpec   *pspec)
  51 {
  52   switch (property_id)
  53   {
  54     case PROP_FILENAME:
  55       /* Do nothing */
  56       break;
  57     default:
  58       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  59       break;
  60   }
  61 }
  62
  63 static GObject *
  64 g_local_file_monitor_constructor (GType                  type,
  65                                   guint                  n_construct_properties,
  66                                   GObjectConstructParam *construct_properties)
  67 {
  68   GObject *obj;
  69   GLocalFileMonitorClass *klass;
  70   GObjectClass *parent_class;
  71   GLocalFileMonitor *local_monitor;
  72   const gchar *filename = NULL;
  73   gint i;
  74
  75   klass = G_LOCAL_FILE_MONITOR_CLASS (g_type_class_peek (G_TYPE_LOCAL_FILE_MONITOR));
  76   parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
  77   obj = parent_class->constructor (type,
  78                                    n_construct_properties,
  79                                    construct_properties);
  80
  81   local_monitor = G_LOCAL_FILE_MONITOR (obj);
  82
  83   for (i = 0; i < n_construct_properties; i++)
  84     {
  85       if (strcmp ("filename", g_param_spec_get_name (construct_properties[i].pspec)) == 0)
  86         {
  87           g_warn_if_fail (G_VALUE_HOLDS_STRING (construct_properties[i].value));
  88           filename = g_value_get_string (construct_properties[i].value);
  89           break;
  90         }
  91     }
  92
  93   g_warn_if_fail (filename != NULL);
  94
  95   local_monitor->filename = g_strdup (filename);
  96   return obj;
  97 }
  98
  99 static void
 100 g_local_file_monitor_finalize (GObject *object)
 101 {
 102   GLocalFileMonitor *local_monitor = G_LOCAL_FILE_MONITOR (object);
 103   if (local_monitor->filename)
 104     {
 105       g_free (local_monitor->filename);
 106       local_monitor->filename = NULL;
 107     }
 108
 109   if (G_OBJECT_CLASS (g_local_file_monitor_parent_class)->finalize)
 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 gint
 133 _compare_monitor_type_by_prio (gconstpointer _a,
 134                                gconstpointer _b,
 135                                gpointer      user_data)
 136 {
 137   const GType *a = _a, *b = _b;
 138   int prio_a, prio_b;
 139   gint ret;
 140   GQuark private_q;
 141
 142   private_q = g_quark_from_static_string ("gio-prio");
 143
 144   prio_a = GPOINTER_TO_INT (g_type_get_qdata (*a, private_q));
 145   prio_b = GPOINTER_TO_INT (g_type_get_qdata (*b, private_q));
 146
 147   ret = prio_b - prio_a;
 148
 149   return ret;
 150 }
 151
 152 static gpointer
 153 get_default_local_file_monitor (gpointer data)
 154 {
 155   GType *monitor_impls;
 156   guint n_monitor_impls;
 157   gint i;
 158   GLocalFileMonitorClass *chosen_class;
 159   GLocalFileMonitorClass **ret = data;
 160
 161   _g_io_modules_ensure_loaded ();
 162
 163   monitor_impls = g_type_children (G_TYPE_LOCAL_FILE_MONITOR,
 164                                    &n_monitor_impls);
 165
 166   g_qsort_with_data (monitor_impls,
 167                      n_monitor_impls,
 168                      sizeof (GType),
 169                      _compare_monitor_type_by_prio,
 170                      NULL);
 171
 172   chosen_class = NULL;
 173   for (i = 0; i < n_monitor_impls; i++)
 174     {
 175       GLocalFileMonitorClass *klass;
 176
 177       klass = G_LOCAL_FILE_MONITOR_CLASS (g_type_class_ref (monitor_impls[i]));
 178
 179       if (klass->is_supported ())
 180         {
 181           chosen_class = klass;
 182           break;
 183         }
 184       else
 185         g_type_class_unref (klass);
 186     }
 187
 188   g_free (monitor_impls);
 189
 190   if (chosen_class)
 191     {
 192       *ret = chosen_class;
 193       return (gpointer)G_TYPE_FROM_CLASS (chosen_class);
 194     }
 195   else
 196     return (gpointer)G_TYPE_INVALID;
 197 }
 198
 199 /**
 200  * g_local_file_monitor_new:
 201  * @pathname: path name to monitor.
 202  * @flags: #GFileMonitorFlags.
 203  *
 204  * Returns: a new #GFileMonitor for the given @pathname.
 205  **/
 206 GFileMonitor*
 207 _g_local_file_monitor_new (const char         *pathname,
 208                            GFileMonitorFlags   flags,
 209                            GError            **error)
 210 {
 211   static GOnce once_init = G_ONCE_INIT;
 212   GTypeClass *type_class;
 213   GFileMonitor *monitor;
 214   GType type;
 215
 216   type_class = NULL;
 217   g_once (&once_init, get_default_local_file_monitor, &type_class);
 218   type = (GType)once_init.retval;
 219
 220   monitor = NULL;
 221   if (type != G_TYPE_INVALID)
 222     monitor = G_FILE_MONITOR (g_object_new (type, "filename", pathname, NULL));
 223   else
 224     g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Unable to find default local file monitor type"));
 225
 226   /* This is non-null on first pass here. Unref the class now.
 227    * This is to avoid unloading the module and then loading it
 228    * again which would happen if we unrefed the class
 229    * before creating the monitor.
 230    */
 231
 232   if (type_class)
 233     g_type_class_unref (type_class);
 234
 235   return monitor;
 236 }
 237
 238 #define __G_LOCAL_FILE_MONITOR_C__
 239 #include "gioaliasdef.c"