[tracker-miners/wip/carlosg/shuffle-libtracker-miner: 109/115] libtracker-miner: Use own graph in TrackerFileNotifier queries

[Carlos Garnacho <carlosg src gnome org>]

commit 5b6182d213b8fd35372f1df9e0529ff21c132282
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Jul 14 21:31:42 2019 +0200

    libtracker-miner: Use own graph in TrackerFileNotifier queries
    
    This is significantly faster than querying the union graph, when we
    know where is the data we want.

 src/libtracker-miner/tracker-file-notifier.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-file-notifier.c b/src/libtracker-miner/tracker-file-notifier.c
index 52f0c0f46..bede17bf4 100644
--- a/src/libtracker-miner/tracker-file-notifier.c
+++ b/src/libtracker-miner/tracker-file-notifier.c
@@ -792,10 +792,15 @@ sparql_contents_compose_query (GFile *directory)
        gchar *sparql, *uri;
 
        uri = g_file_get_uri (directory);
-       sparql = g_strdup_printf ("SELECT nie:url(?u) ?u nfo:fileLastModified(?u) "
-                                 "       IF (nie:mimeType(?u) = \"inode/directory\", true, false) {"
-                                 " ?u nfo:belongsToContainer ?f . ?f nie:url ?url ."
-                                 " FILTER (?url = \"%s\")"
+       sparql = g_strdup_printf ("SELECT ?url ?u ?lastModified ?isFolder "
+                                 "FROM <" TRACKER_OWN_GRAPH_URN "> {"
+                                 " ?u nfo:belongsToContainer ?f ;"
+                                 "    nfo:fileLastModified ?lastModified ;"
+                                 "    nie:url ?url ."
+                                 " OPTIONAL { ?u nie:mimeType ?mimeType . "
+                                 "            BIND (IF (?mimeType = \"inode/directory\", true, false) AS 
?isFolder) } ."
+                                 " ?f nie:url ?folderUrl ."
+                                 " FILTER (?folderUrl = \"%s\")"
                                  "}", uri);
        g_free (uri);
 
@@ -885,9 +890,12 @@ sparql_files_compose_query (GFile **files,
        gchar *uri;
        gint i = 0;
 
-       str = g_string_new ("SELECT ?url ?u nfo:fileLastModified(?u) {"
-                           "  ?u a rdfs:Resource ; nie:url ?url . "
-                           "FILTER (?url IN (");
+       str = g_string_new ("SELECT ?url ?u ?lastModified "
+                           "FROM <" TRACKER_OWN_GRAPH_URN "> {"
+                           "  ?u a rdfs:Resource ;"
+                           "     nfo:fileLastModified ?lastModified ;"
+                           "     nie:url ?url . "
+                           "  FILTER (?url IN (");
        for (i = 0; i < n_files; i++) {
                if (i != 0)
                        g_string_append_c (str, ',');