forked from AuroraMiddleware/gtk
95dbbe2bda
Tracker 0.8 series (and late 0.7.xx) introduces new API based on SPARQL query language. The queries here use fulltext search, just like with with previous tracker versions. Old tracker 0.6 support is still maintained.
453 lines
12 KiB
C
453 lines
12 KiB
C
/*
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* Copyright (C) 2005 Mr Jamie McCracken
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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*
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* Author: Jamie McCracken <jamiemcc@gnome.org>
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*
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* Based on nautilus-search-engine-tracker.c
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*/
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#include "config.h"
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#include <gmodule.h>
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#include "gtksearchenginetracker.h"
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/* we dlopen() libtracker at runtime */
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typedef struct _TrackerClient TrackerClient;
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typedef enum
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{
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TRACKER_0_6 = 1 << 0,
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TRACKER_0_7 = 1 << 1,
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TRACKER_0_8 = 1 << 2
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} TrackerVersion;
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/* tracker 0.6 API */
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typedef void (*TrackerArrayReply) (char **result, GError *error, gpointer user_data);
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static TrackerClient * (*tracker_connect) (gboolean enable_warnings, gint timeout) = NULL;
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static void (*tracker_disconnect) (TrackerClient *client) = NULL;
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static int (*tracker_get_version) (TrackerClient *client, GError **error) = NULL;
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static void (*tracker_cancel_last_call) (TrackerClient *client) = NULL;
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static void (*tracker_search_metadata_by_text_async) (TrackerClient *client,
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const char *query,
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TrackerArrayReply callback,
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gpointer user_data) = NULL;
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static void (*tracker_search_metadata_by_text_and_location_async) (TrackerClient *client,
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const char *query,
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const char *location,
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TrackerArrayReply callback,
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gpointer user_data) = NULL;
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/* tracker 0.8 API */
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typedef enum {
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TRACKER_CLIENT_ENABLE_WARNINGS = 1 << 0
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} TrackerClientFlags;
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typedef void (*TrackerReplyGPtrArray) (GPtrArray *result,
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GError *error,
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gpointer user_data);
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static TrackerClient * (*tracker_client_new) (TrackerClientFlags flags,
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gint timeout) = NULL;
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static gchar * (*tracker_sparql_escape) (const gchar *str) = NULL;
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static guint (*tracker_resources_sparql_query_async) (TrackerClient *client,
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const gchar *query,
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TrackerReplyGPtrArray callback,
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gpointer user_data) = NULL;
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static struct TrackerDlMapping
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{
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const char *fn_name;
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gpointer *fn_ptr_ref;
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TrackerVersion versions;
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} tracker_dl_mapping[] =
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{
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#define MAP(a,v) { #a, (gpointer *)&a, v }
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MAP (tracker_connect, TRACKER_0_6 | TRACKER_0_7),
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MAP (tracker_disconnect, TRACKER_0_6 | TRACKER_0_7),
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MAP (tracker_get_version, TRACKER_0_6),
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MAP (tracker_cancel_last_call, TRACKER_0_6 | TRACKER_0_7 | TRACKER_0_8),
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MAP (tracker_search_metadata_by_text_async, TRACKER_0_6 | TRACKER_0_7),
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MAP (tracker_search_metadata_by_text_and_location_async, TRACKER_0_6 | TRACKER_0_7),
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MAP (tracker_client_new, TRACKER_0_8),
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MAP (tracker_sparql_escape, TRACKER_0_8),
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MAP (tracker_resources_sparql_query_async, TRACKER_0_8)
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#undef MAP
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};
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static TrackerVersion
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open_libtracker (void)
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{
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static gboolean done = FALSE;
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static TrackerVersion version = 0;
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gpointer x;
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if (!done)
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{
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int i;
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GModule *tracker;
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GModuleFlags flags;
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done = TRUE;
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flags = G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL;
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tracker = g_module_open ("libtracker-client-0.7.so.0", flags);
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version = TRACKER_0_7;
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if (tracker && g_module_symbol (tracker, "tracker_resources_sparql_query_async", &x))
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{
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version = TRACKER_0_8;
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}
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if (!tracker)
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{
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tracker = g_module_open ("libtrackerclient.so.0", flags);
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version = TRACKER_0_6;
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}
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if (!tracker)
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{
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tracker = g_module_open ("libtracker.so.0", flags);
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version = TRACKER_0_6;
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}
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if (!tracker)
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return 0;
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for (i = 0; i < G_N_ELEMENTS (tracker_dl_mapping); i++)
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{
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if ((tracker_dl_mapping[i].versions & version) == 0)
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continue;
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if (!g_module_symbol (tracker, tracker_dl_mapping[i].fn_name,
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tracker_dl_mapping[i].fn_ptr_ref))
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{
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g_warning ("Missing symbol '%s' in libtracker\n",
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tracker_dl_mapping[i].fn_name);
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g_module_close (tracker);
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for (i = 0; i < G_N_ELEMENTS (tracker_dl_mapping); i++)
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tracker_dl_mapping[i].fn_ptr_ref = NULL;
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return 0;
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}
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}
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}
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return version;
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}
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struct _GtkSearchEngineTrackerPrivate
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{
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GtkQuery *query;
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TrackerClient *client;
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gboolean query_pending;
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TrackerVersion version;
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};
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G_DEFINE_TYPE (GtkSearchEngineTracker, _gtk_search_engine_tracker, GTK_TYPE_SEARCH_ENGINE);
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static void
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finalize (GObject *object)
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{
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GtkSearchEngineTracker *tracker;
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tracker = GTK_SEARCH_ENGINE_TRACKER (object);
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if (tracker->priv->query)
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{
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g_object_unref (tracker->priv->query);
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tracker->priv->query = NULL;
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}
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if (tracker->priv->version == TRACKER_0_8)
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g_object_unref (tracker->priv->client);
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else
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tracker_disconnect (tracker->priv->client);
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G_OBJECT_CLASS (_gtk_search_engine_tracker_parent_class)->finalize (object);
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}
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/* stolen from tracker sources, tracker.c */
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static void
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sparql_append_string_literal (GString *sparql,
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const gchar *str)
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{
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char *s;
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s = tracker_sparql_escape (str);
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g_string_append_c (sparql, '"');
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g_string_append (sparql, s);
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g_string_append_c (sparql, '"');
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g_free (s);
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}
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static void
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search_callback (gpointer results,
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GError *error,
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gpointer user_data)
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{
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GtkSearchEngineTracker *tracker;
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gchar **results_p;
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GList *hit_uris;
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GPtrArray *OUT_result;
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gchar *uri;
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gint i;
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tracker = GTK_SEARCH_ENGINE_TRACKER (user_data);
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hit_uris = NULL;
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tracker->priv->query_pending = FALSE;
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if (error)
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{
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_gtk_search_engine_error (GTK_SEARCH_ENGINE (tracker), error->message);
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g_error_free (error);
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return;
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}
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if (!results)
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return;
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if (tracker->priv->version == TRACKER_0_8)
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{
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OUT_result = (GPtrArray*) results;
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for (i = 0; i < OUT_result->len; i++)
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{
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uri = g_strdup (((gchar **) OUT_result->pdata[i])[0]);
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if (uri)
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hit_uris = g_list_prepend (hit_uris, uri);
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}
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g_ptr_array_foreach (OUT_result, (GFunc) g_free, NULL);
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g_ptr_array_free (OUT_result, TRUE);
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}
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else
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{
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for (results_p = results; *results_p; results_p++)
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{
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if (tracker->priv->version == TRACKER_0_6)
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uri = g_filename_to_uri (*results_p, NULL, NULL);
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else
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uri = g_strdup (*results_p);
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if (uri)
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hit_uris = g_list_prepend (hit_uris, uri);
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}
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g_strfreev ((gchar **) results);
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}
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_gtk_search_engine_hits_added (GTK_SEARCH_ENGINE (tracker), hit_uris);
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_gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
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g_list_foreach (hit_uris, (GFunc) g_free, NULL);
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g_list_free (hit_uris);
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}
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static void
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gtk_search_engine_tracker_start (GtkSearchEngine *engine)
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{
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GtkSearchEngineTracker *tracker;
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gchar *search_text, *location, *location_uri;
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GString *sparql;
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tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
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if (tracker->priv->query_pending)
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return;
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if (tracker->priv->query == NULL)
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return;
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search_text = _gtk_query_get_text (tracker->priv->query);
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location_uri = _gtk_query_get_location (tracker->priv->query);
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location = NULL;
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if (location_uri)
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{
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if (tracker->priv->version == TRACKER_0_6)
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{
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location = g_filename_from_uri (location_uri, NULL, NULL);
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g_free (location_uri);
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}
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else
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location = location_uri;
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}
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if (tracker->priv->version == TRACKER_0_8)
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{
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sparql = g_string_new ("SELECT ?url WHERE { ?file a nfo:FileDataObject; nie:url ?url; fts:match ");
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sparql_append_string_literal (sparql, search_text);
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if (location)
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{
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g_string_append (sparql, " . FILTER (fn:starts-with(?url,");
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sparql_append_string_literal (sparql, location);
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g_string_append (sparql, "))");
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}
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g_string_append (sparql, " }");
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tracker_resources_sparql_query_async (tracker->priv->client,
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sparql->str,
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(TrackerReplyGPtrArray) search_callback,
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tracker);
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g_string_free (sparql, TRUE);
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}
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else
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{
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if (location)
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{
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tracker_search_metadata_by_text_and_location_async (tracker->priv->client,
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search_text,
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location,
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(TrackerArrayReply) search_callback,
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tracker);
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}
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else
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{
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tracker_search_metadata_by_text_async (tracker->priv->client,
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search_text,
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(TrackerArrayReply) search_callback,
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tracker);
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}
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}
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tracker->priv->query_pending = TRUE;
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g_free (search_text);
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g_free (location);
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}
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static void
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gtk_search_engine_tracker_stop (GtkSearchEngine *engine)
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{
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GtkSearchEngineTracker *tracker;
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tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
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if (tracker->priv->query && tracker->priv->query_pending)
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{
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tracker_cancel_last_call (tracker->priv->client);
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tracker->priv->query_pending = FALSE;
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}
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}
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static gboolean
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gtk_search_engine_tracker_is_indexed (GtkSearchEngine *engine)
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{
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return TRUE;
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}
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static void
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gtk_search_engine_tracker_set_query (GtkSearchEngine *engine,
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GtkQuery *query)
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{
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GtkSearchEngineTracker *tracker;
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tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
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if (query)
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g_object_ref (query);
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if (tracker->priv->query)
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g_object_unref (tracker->priv->query);
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tracker->priv->query = query;
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}
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static void
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_gtk_search_engine_tracker_class_init (GtkSearchEngineTrackerClass *class)
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{
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GObjectClass *gobject_class;
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GtkSearchEngineClass *engine_class;
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gobject_class = G_OBJECT_CLASS (class);
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gobject_class->finalize = finalize;
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engine_class = GTK_SEARCH_ENGINE_CLASS (class);
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engine_class->set_query = gtk_search_engine_tracker_set_query;
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engine_class->start = gtk_search_engine_tracker_start;
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engine_class->stop = gtk_search_engine_tracker_stop;
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engine_class->is_indexed = gtk_search_engine_tracker_is_indexed;
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g_type_class_add_private (gobject_class, sizeof (GtkSearchEngineTrackerPrivate));
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}
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static void
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_gtk_search_engine_tracker_init (GtkSearchEngineTracker *engine)
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{
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engine->priv = G_TYPE_INSTANCE_GET_PRIVATE (engine, GTK_TYPE_SEARCH_ENGINE_TRACKER, GtkSearchEngineTrackerPrivate);
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}
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GtkSearchEngine *
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_gtk_search_engine_tracker_new (void)
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{
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GtkSearchEngineTracker *engine;
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TrackerClient *tracker_client;
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TrackerVersion version;
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GError *err = NULL;
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version = open_libtracker ();
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if (version == TRACKER_0_8)
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{
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tracker_client = tracker_client_new (TRACKER_CLIENT_ENABLE_WARNINGS, G_MAXINT);
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}
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else
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{
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if (!tracker_connect)
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return NULL;
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tracker_client = tracker_connect (FALSE, -1);
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}
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if (!tracker_client)
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return NULL;
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if (version == TRACKER_0_6)
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{
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if (!tracker_get_version)
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return NULL;
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tracker_get_version (tracker_client, &err);
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if (err != NULL)
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{
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g_error_free (err);
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tracker_disconnect (tracker_client);
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return NULL;
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}
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}
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engine = g_object_new (GTK_TYPE_SEARCH_ENGINE_TRACKER, NULL);
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engine->priv->client = tracker_client;
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engine->priv->query_pending = FALSE;
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engine->priv->version = version;
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return GTK_SEARCH_ENGINE (engine);
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}
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