[tracker/wip/carlosg/namespace-api-updates: 1/4] libtracker-sparql: Add public TrackerNamespaceManager method to compress URIs

[Carlos Garnacho <carlosg src gnome org>]

commit 4f288f48de0b3c45c1e851ff08e9acdea87fc3e0
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Nov 7 11:26:53 2021 +0100

    libtracker-sparql: Add public TrackerNamespaceManager method to compress URIs
    
    It's sometimes also useful (mostly, printing purposes) to compress full URIs
    into a $prefix:$suffix form. Add the missing TrackerNamespaceManager method
    to help do that.

 src/libtracker-sparql/tracker-namespace-manager.c | 38 +++++++++++++++++++++++
 src/libtracker-sparql/tracker-namespace-manager.h |  3 ++
 2 files changed, 41 insertions(+)
---
diff --git a/src/libtracker-sparql/tracker-namespace-manager.c 
b/src/libtracker-sparql/tracker-namespace-manager.c
index 832be6e27..f4c61a57a 100644
--- a/src/libtracker-sparql/tracker-namespace-manager.c
+++ b/src/libtracker-sparql/tracker-namespace-manager.c
@@ -286,6 +286,44 @@ tracker_namespace_manager_expand_uri (TrackerNamespaceManager *self,
        }
 }
 
+/**
+ * tracker_namespace_manager_compress_uri:
+ * @self: a #TrackerNamespaceManager
+ * @uri: a URI or compact URI
+ *
+ * If @uri begins with one of the namespaces known to this
+ * #TrackerNamespaceManager, then the return value will be the
+ * compressed URI. Otherwise, %NULL will be returned.
+ *
+ * Returns: (transfer full): (nullable): the compressed URI
+ *
+ * Since: 3.3
+ **/
+char *
+tracker_namespace_manager_compress_uri (TrackerNamespaceManager *self,
+                                        const char              *uri)
+{
+       TrackerNamespaceManagerPrivate *priv;
+       GHashTableIter iter;
+       const char *prefix, *namespace, *suffix;
+
+       g_return_val_if_fail (TRACKER_IS_NAMESPACE_MANAGER (self), NULL);
+       g_return_val_if_fail (uri != NULL, NULL);
+
+       priv = GET_PRIVATE (self);
+
+       g_hash_table_iter_init (&iter, priv->prefix_to_namespace);
+
+       while (g_hash_table_iter_next (&iter, (gpointer *) &prefix, (gpointer *) &namespace)) {
+               if (g_str_has_prefix (uri, namespace)) {
+                       suffix = &uri[strlen(namespace)];
+                       return g_strdup_printf ("%s:%s", prefix, suffix);
+               }
+       }
+
+       return NULL;
+}
+
 /**
  * tracker_namespace_manager_print_turtle:
  * @self: a #TrackerNamespaceManager
diff --git a/src/libtracker-sparql/tracker-namespace-manager.h 
b/src/libtracker-sparql/tracker-namespace-manager.h
index 85a30a74d..ce123aabb 100644
--- a/src/libtracker-sparql/tracker-namespace-manager.h
+++ b/src/libtracker-sparql/tracker-namespace-manager.h
@@ -48,6 +48,9 @@ TrackerNamespaceManager *tracker_namespace_manager_get_default (void);
 TRACKER_AVAILABLE_IN_ALL
 char *tracker_namespace_manager_expand_uri (TrackerNamespaceManager *self, const char *compact_uri);
 
+TRACKER_AVAILABLE_IN_3_3
+char *tracker_namespace_manager_compress_uri (TrackerNamespaceManager *self, const char *uri);
+
 TRACKER_AVAILABLE_IN_ALL
 gboolean tracker_namespace_manager_has_prefix (TrackerNamespaceManager *self, const char *prefix);
 TRACKER_AVAILABLE_IN_ALL