[tracker/wip/carlosg/graphs: 9/12] libtracker-sparql: Don't skip TrackerResources by URI

[Carlos Garnacho <carlosg src gnome org>]

commit 569b0a9cb3112ddb2e00e83f5e1c4cc976e34141
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Apr 23 23:28:32 2020 +0200

    libtracker-sparql: Don't skip TrackerResources by URI
    
    If different relations are set on different TrackerResources with
    the same uri, only the first would be found at the same of printing
    the resulting sparql/json/ttl output. This may miss properties being
    set on the other resources that are skipped.
    
    This is a case happening in the nie:DataObject/nie:InformationElement
    split, as tracker-extract will receive a TrackerResource to be used
    for the nie:InformationElement, but nie:hasHash and nie:dataSource
    need to be set on the nie:DataObject at places isolated from each
    other.
    
    The solution to that is have those places create an intermediate
    TrackerResource for the nie:DataObject each, and set the desired
    properties.
    
    In order to have all those properties properly printed, we don't
    need to skip resources based on their identifier URI, detecting
    cycles is still necessary. This may break if several of these
    resources where to do tracker_resource_set_*() on the very same
    property, and all expected the property to be cleared. Let's deem
    this much of a corner case to justify larger refactors.

 src/libtracker-sparql/tracker-resource.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)
---
diff --git a/src/libtracker-sparql/tracker-resource.c b/src/libtracker-sparql/tracker-resource.c
index bf0c40a4c..8bbe3ba46 100644
--- a/src/libtracker-sparql/tracker-resource.c
+++ b/src/libtracker-sparql/tracker-resource.c
@@ -963,14 +963,6 @@ tracker_resource_compare (TrackerResource *a,
        return strcmp (a_priv->identifier, b_priv->identifier);
 };
 
-/* Internal helper. */
-static GList *
-g_list_find_resource (GList *list,
-                      TrackerResource *resource) {
-       return g_list_find_custom (list, resource, (GCompareFunc) tracker_resource_compare);
-}
-
-
 /* Helper function for serialization code. This allows you to selectively
  * populate 'interned_namespaces' from 'all_namespaces' based on when a
  * particular prefix is actually used. This is quite inefficient compared
@@ -1053,7 +1045,7 @@ generate_nested_turtle_resource (TrackerResource    *resource,
                              data->all_namespaces))
                return;
 
-       if (g_list_find_resource (data->done_list, resource) == NULL) {
+       if (g_list_find (data->done_list, resource) == NULL) {
                data->done_list = g_list_prepend (data->done_list, resource);
                generate_turtle (resource, data);
                g_string_append (data->string, "\n");
@@ -1435,7 +1427,7 @@ generate_sparql_deletes (TrackerResource    *resource,
 {
        TrackerResourcePrivate *priv = GET_PRIVATE (resource);
 
-       if (g_list_find_resource (data->done_list, resource) != NULL)
+       if (g_list_find (data->done_list, resource) != NULL)
                /* We already processed this resource. */
                return;
 
@@ -1460,7 +1452,7 @@ generate_sparql_insert_pattern (TrackerResource    *resource,
        const GValue *value;
        gboolean had_property = FALSE;
 
-       if (g_list_find_resource (data->done_list, resource) != NULL)
+       if (g_list_find (data->done_list, resource) != NULL)
                /* We already processed this resource. */
                return;
 
@@ -1617,7 +1609,7 @@ generate_jsonld_value (const GValue       *value,
 
                resource = TRACKER_RESOURCE (g_value_get_object (value));
 
-               if (g_list_find_resource (data->done_list, resource) == NULL) {
+               if (g_list_find (data->done_list, resource) == NULL) {
                        data->done_list = g_list_prepend (data->done_list, resource);
                        json_builder_begin_object (data->builder);