Pileus Git - ~andy/gtk/blob - gtk/gtksearchenginetracker.c

   1 /*
   2  * Copyright (C) 2005 Mr Jamie McCracken
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *
  18  * Author: Jamie McCracken <jamiemcc@gnome.org>
  19  *
  20  * Based on nautilus-search-engine-tracker.c
  21  */
  22
  23 #include <config.h>
  24 #include <gmodule.h>
  25 #include "gtksearchenginetracker.h"
  26 #if 0
  27 #include <tracker.h>
  28 #endif
  29
  30 /* we dlopen() libtracker at runtime */
  31
  32 typedef struct _TrackerClient TrackerClient;
  33
  34 typedef void (*TrackerArrayReply) (char **result, GError *error, gpointer user_data);
  35
  36 static TrackerClient * (*tracker_connect) (gboolean enable_warnings) = NULL;
  37 static void            (*tracker_disconnect) (TrackerClient *client) = NULL;
  38 static void            (*tracker_cancel_last_call) (TrackerClient *client) = NULL;
  39
  40 static void (*tracker_search_metadata_by_text_async) (TrackerClient *client,
  41                                                       const char *query,
  42                                                       TrackerArrayReply callback,
  43                                                       gpointer user_data) = NULL;
  44 static void (*tracker_search_metadata_by_text_and_location_async) (TrackerClient *client,
  45                                                                    const char *query,
  46                                                                    const char *location,
  47                                                                    TrackerArrayReply callback,
  48                                                                    gpointer user_data) = NULL;
  49
  50 static struct TrackerDlMapping
  51 {
  52   const char *fn_name;
  53   gpointer *fn_ptr_ref;
  54 } tracker_dl_mapping[] =
  55 {
  56 #define MAP(a) { #a, (gpointer *)&a }
  57   MAP (tracker_connect),
  58   MAP (tracker_disconnect),
  59   MAP (tracker_cancel_last_call),
  60   MAP (tracker_search_metadata_by_text_async),
  61   MAP (tracker_search_metadata_by_text_and_location_async),
  62 #undef MAP
  63 };
  64
  65 static void
  66 open_libtracker (void)
  67 {
  68   static gboolean done = FALSE;
  69
  70   if (!done)
  71     {
  72       int i;
  73       GModule *tracker;
  74       GModuleFlags flags;
  75
  76       done = TRUE;
  77       flags = G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL;
  78
  79       tracker = g_module_open ("libtrackerclient.so.0", flags);
  80
  81       if (!tracker)
  82         tracker = g_module_open ("libtracker.so.0", flags);
  83
  84       if (!tracker)
  85         return;
  86
  87       for (i = 0; i < G_N_ELEMENTS (tracker_dl_mapping); i++)
  88         {
  89           if (!g_module_symbol (tracker, tracker_dl_mapping[i].fn_name,
  90                                 tracker_dl_mapping[i].fn_ptr_ref))
  91             {
  92               g_warning ("Missing symbol '%s' in libtracker\n",
  93                          tracker_dl_mapping[i].fn_name);
  94               g_module_close (tracker);
  95
  96               for (i = 0; i < G_N_ELEMENTS (tracker_dl_mapping); i++)
  97                 tracker_dl_mapping[i].fn_ptr_ref = NULL;
  98
  99               return;
 100             }
 101         }
 102     }
 103 }
 104
 105 struct _GtkSearchEngineTrackerPrivate
 106 {
 107   GtkQuery      *query;
 108   TrackerClient *client;
 109   gboolean       query_pending;
 110 };
 111
 112 G_DEFINE_TYPE (GtkSearchEngineTracker, _gtk_search_engine_tracker, GTK_TYPE_SEARCH_ENGINE);
 113
 114
 115 static void
 116 finalize (GObject *object)
 117 {
 118   GtkSearchEngineTracker *tracker;
 119
 120   tracker = GTK_SEARCH_ENGINE_TRACKER (object);
 121
 122   if (tracker->priv->query)
 123     {
 124       g_object_unref (tracker->priv->query);
 125       tracker->priv->query = NULL;
 126     }
 127
 128   tracker_disconnect (tracker->priv->client);
 129
 130   G_OBJECT_CLASS (_gtk_search_engine_tracker_parent_class)->finalize (object);
 131 }
 132
 133
 134 static void
 135 search_callback (gchar  **results,
 136                  GError  *error,
 137                  gpointer user_data)
 138 {
 139   GtkSearchEngineTracker *tracker;
 140   gchar **results_p;
 141   GList *hit_uris;
 142
 143   tracker = GTK_SEARCH_ENGINE_TRACKER (user_data);
 144   hit_uris = NULL;
 145
 146   tracker->priv->query_pending = FALSE;
 147
 148   if (error)
 149     {
 150       _gtk_search_engine_error ( GTK_SEARCH_ENGINE (tracker), error->message);
 151       g_error_free (error);
 152       return;
 153     }
 154
 155   if (!results)
 156     return;
 157
 158   for (results_p = results; *results_p; results_p++)
 159     {
 160       gchar *uri;
 161
 162       uri = g_filename_to_uri (*results_p, NULL, NULL);
 163       if (uri)
 164         hit_uris = g_list_prepend (hit_uris, uri);
 165     }
 166
 167   _gtk_search_engine_hits_added (GTK_SEARCH_ENGINE (tracker), hit_uris);
 168   _gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
 169
 170   g_strfreev  (results);
 171   g_list_foreach (hit_uris, (GFunc)g_free, NULL);
 172   g_list_free (hit_uris);
 173 }
 174
 175
 176 static void
 177 gtk_search_engine_tracker_start (GtkSearchEngine *engine)
 178 {
 179   GtkSearchEngineTracker *tracker;
 180   gchar *search_text, *location, *location_uri;
 181
 182   tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
 183
 184   if (tracker->priv->query_pending)
 185     return;
 186
 187   if (tracker->priv->query == NULL)
 188     return;
 189
 190   search_text = _gtk_query_get_text (tracker->priv->query);
 191   location_uri = _gtk_query_get_location (tracker->priv->query);
 192
 193   location = NULL;
 194   if (location_uri)
 195     {
 196       location = g_filename_from_uri (location_uri, NULL, NULL);
 197       g_free (location_uri);
 198     }
 199
 200   if (location)
 201     {
 202       tracker_search_metadata_by_text_and_location_async (tracker->priv->client,
 203                                                           search_text,
 204                                                           location,
 205                                                           search_callback,
 206                                                           tracker);
 207       g_free (location);
 208     }
 209   else
 210     {
 211       tracker_search_metadata_by_text_async (tracker->priv->client,
 212                                              search_text,
 213                                              search_callback,
 214                                              tracker);
 215     }
 216
 217   tracker->priv->query_pending = TRUE;
 218   g_free (search_text);
 219 }
 220
 221 static void
 222 gtk_search_engine_tracker_stop (GtkSearchEngine *engine)
 223 {
 224   GtkSearchEngineTracker *tracker;
 225
 226   tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
 227
 228   if (tracker->priv->query && tracker->priv->query_pending)
 229     {
 230       tracker_cancel_last_call (tracker->priv->client);
 231       tracker->priv->query_pending = FALSE;
 232     }
 233 }
 234
 235 static gboolean
 236 gtk_search_engine_tracker_is_indexed (GtkSearchEngine *engine)
 237 {
 238   return TRUE;
 239 }
 240
 241 static void
 242 gtk_search_engine_tracker_set_query (GtkSearchEngine *engine,
 243                                      GtkQuery        *query)
 244 {
 245   GtkSearchEngineTracker *tracker;
 246
 247   tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
 248
 249   if (query)
 250     g_object_ref (query);
 251
 252   if (tracker->priv->query)
 253     g_object_unref (tracker->priv->query);
 254
 255   tracker->priv->query = query;
 256 }
 257
 258 static void
 259 _gtk_search_engine_tracker_class_init (GtkSearchEngineTrackerClass *class)
 260 {
 261   GObjectClass *gobject_class;
 262   GtkSearchEngineClass *engine_class;
 263
 264   gobject_class = G_OBJECT_CLASS (class);
 265   gobject_class->finalize = finalize;
 266
 267   engine_class = GTK_SEARCH_ENGINE_CLASS (class);
 268   engine_class->set_query = gtk_search_engine_tracker_set_query;
 269   engine_class->start = gtk_search_engine_tracker_start;
 270   engine_class->stop = gtk_search_engine_tracker_stop;
 271   engine_class->is_indexed = gtk_search_engine_tracker_is_indexed;
 272
 273   g_type_class_add_private (gobject_class, sizeof (GtkSearchEngineTrackerPrivate));
 274 }
 275
 276 static void
 277 _gtk_search_engine_tracker_init (GtkSearchEngineTracker *engine)
 278 {
 279   engine->priv = G_TYPE_INSTANCE_GET_PRIVATE (engine, GTK_TYPE_SEARCH_ENGINE_TRACKER, GtkSearchEngineTrackerPrivate);
 280 }
 281
 282
 283 GtkSearchEngine *
 284 _gtk_search_engine_tracker_new (void)
 285 {
 286   GtkSearchEngineTracker *engine;
 287   TrackerClient *tracker_client;
 288
 289   open_libtracker ();
 290
 291   if (!tracker_connect)
 292     return NULL;
 293
 294   tracker_client = tracker_connect (FALSE);
 295
 296   if (!tracker_client)
 297     return NULL;
 298
 299   engine = g_object_new (GTK_TYPE_SEARCH_ENGINE_TRACKER, NULL);
 300
 301   engine->priv->client = tracker_client;
 302   engine->priv->query_pending = FALSE;
 303
 304   return GTK_SEARCH_ENGINE (engine);
 305 }