[tracker/wip/sam/resource: 1/13] libtracker-sparql: Add TrackerNamespaceManager

[Sam Thursfield <sthursfield src gnome org>]

commit 2b1bdeb2b33c17f9561283c20395b90e7faf3f0b
Author: Sam Thursfield <sam afuera me uk>
Date:   Fri Apr 8 17:57:46 2016 +0100

    libtracker-sparql: Add TrackerNamespaceManager
    
    This will keep track of a set of namespaces and their prefixes. Then,
    when we are serializing a resource, we can use it.
    
    This is separate from the Namespace and Ontologies classes in
    libtracker-data. They may be able to make use of it though.

 src/libtracker-sparql/Makefile.am                 |    3 +
 src/libtracker-sparql/tracker-namespace-manager.c |  113 +++++++++++++++++++++
 src/libtracker-sparql/tracker-namespace-manager.h |   41 ++++++++
 3 files changed, 157 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-sparql/Makefile.am b/src/libtracker-sparql/Makefile.am
index 48ed4ad..3f6925b 100644
--- a/src/libtracker-sparql/Makefile.am
+++ b/src/libtracker-sparql/Makefile.am
@@ -22,6 +22,8 @@ libtracker_sparql_la_SOURCES =   \
        tracker-builder.vala                           \
        tracker-connection.vala                        \
        tracker-cursor.vala                            \
+       tracker-namespace-manager.c                    \
+       tracker-namespace-manager.h                    \
        tracker-utils.vala                             \
        tracker-uri.c                                  \
        tracker-ontologies.h \
@@ -48,6 +50,7 @@ tracker-sparql-$(TRACKER_API_VERSION).vapi: tracker-sparql.vapi
 
 libtracker_sparqlinclude_HEADERS =                     \
        $(vala_header)                                 \
+       tracker-namespace-manager.h                    \
        tracker-ontologies.h \
        tracker-sparql.h                               \
        tracker-version.h
diff --git a/src/libtracker-sparql/tracker-namespace-manager.c 
b/src/libtracker-sparql/tracker-namespace-manager.c
new file mode 100644
index 0000000..4755253
--- /dev/null
+++ b/src/libtracker-sparql/tracker-namespace-manager.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2016, Sam Thursfield <sam afuera me uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include "config.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#include <glib.h>
+
+#include "tracker-namespace-manager.h"
+
+struct _TrackerNamespaceManager {
+       GObject *parent;
+};
+
+typedef struct {
+       char *foo;
+} TrackerNamespaceManagerPrivate;
+
+G_DEFINE_TYPE_WITH_PRIVATE (TrackerNamespaceManager, tracker_namespace_manager, G_TYPE_OBJECT);
+#define GET_PRIVATE(object)  (tracker_namespace_manager_get_instance_private (object))
+
+/**
+ * SECTION: tracker-namespace-manager
+ * @short_description: A set of well-known namespaces, and known abbreviations for them
+ * @title: TrackerNamespaceManager
+ * @stability: Stable
+ * @include: tracker-namespace-manager.h
+ *
+ * <para>
+ * #TrackerNamespaceManager keeps track of namespaces. It allows you to assign
+ * short prefixes for them to avoid typing full URLs all the time.
+ *
+ * Usually you'll want to use the default namespace manager, as returned by
+ * tracker_namespace_manager_get_default(). This knows about all the namespaces
+ * built in to Tracker.
+ * </para>
+ */
+
+static void finalize     (GObject      *object);
+
+static void
+tracker_namespace_manager_class_init (TrackerNamespaceManagerClass *klass)
+{
+       GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+       object_class->finalize     = finalize;
+}
+
+static void
+tracker_namespace_manager_init (TrackerNamespaceManager *self)
+{
+       TrackerNamespaceManagerPrivate *priv = GET_PRIVATE (self);
+}
+
+static void
+finalize (GObject *object)
+{
+       TrackerNamespaceManagerPrivate *priv;
+
+       priv = GET_PRIVATE (TRACKER_NAMESPACE_MANAGER (object));
+
+       (G_OBJECT_CLASS (tracker_namespace_manager_parent_class)->finalize) (object);
+}
+
+TrackerNamespaceManager *
+tracker_namespace_manager_new ()
+{
+       TrackerNamespaceManager *namespace_manager;
+
+       namespace_manager = g_object_new (TRACKER_TYPE_NAMESPACE_MANAGER, NULL);
+}
+
+TrackerNamespaceManager *
+tracker_namespace_manager_get_default ()
+{
+       static TrackerNamespaceManager * volatile default_namespace_manager__volatile;
+
+       if (g_once_init_enter (&default_namespace_manager__volatile)) {
+               TrackerNamespaceManager *manager = tracker_namespace_manager_new();
+
+               /* FIXME: populate namespaces from tracker-ontology.h */
+
+               g_once_init_leave (&default_namespace_manager__volatile, manager);
+       }
+
+       return default_namespace_manager__volatile;
+}
+
+char *
+tracker_namespace_manager_expand_uri (TrackerNamespaceManager *self,
+                                      const char *short_uri)
+{
+       /* FIXME: stub */
+       return g_strdup (short_uri);
+}
diff --git a/src/libtracker-sparql/tracker-namespace-manager.h 
b/src/libtracker-sparql/tracker-namespace-manager.h
new file mode 100644
index 0000000..8c97a8b
--- /dev/null
+++ b/src/libtracker-sparql/tracker-namespace-manager.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2016, Sam Thursfield <sam afuera me uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __LIBTRACKER_SPARQL_NAMESPACE_MANAGER_H__
+#define __LIBTRACKER_SPARQL_NAMESPACE_MANAGER_H__
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#if !defined (__LIBTRACKER_SPARQL_INSIDE__) && !defined (TRACKER_COMPILATION)
+#error "only <libtracker-sparql/tracker-sparql.h> must be included directly."
+#endif
+
+#define TRACKER_TYPE_NAMESPACE_MANAGER (tracker_namespace_manager_get_type())
+G_DECLARE_FINAL_TYPE (TrackerNamespaceManager, tracker_namespace_manager, TRACKER, NAMESPACE_MANAGER, 
GObject);
+
+TrackerNamespaceManager *tracker_namespace_manager_get_default ();
+
+char *tracker_namespace_manager_expand_uri (TrackerNamespaceManager *self, const char *short_uri);
+
+G_END_DECLS
+
+#endif /* __LIBTRACKER_SPARQL_NAMESPACE_MANAGER_H__ */
+