libtracker-sparql: Add TrackerResource class

This provides a "resource-oriented" API for inserting and updating the
database. Rather than having to generate SPARQL queries, you can use the
TrackerResource abstraction to prepare information about a set of
resources, then generate a SPARQL query automatically.

TrackerResource can also serialize to Turtle directly.

https://bugzilla.gnome.org/show_bug.cgi?id=767472

8 files changed, 1252 insertions, 1 deletions

diff --git a/src/libtracker-sparql-backend/Makefile.am b/src/libtracker-sparql-backend/Makefile.am
index 27356a591..0db7186e2 100644
--- a/src/libtracker-sparql-backend/Makefile.am
+++ b/src/libtracker-sparql-backend/Makefile.am
@@ -25,5 +25,5 @@ libtracker_sparql_@TRACKER_API_VERSION@_la_LIBADD =    \
 
 libtracker_sparql_@TRACKER_API_VERSION@_la_LDFLAGS =   \
 	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE) \
-	-export-symbols-regex '^tracker_sparql_(connection|cursor|builder|escape|error|value|get)_.*'
+	-export-symbols-regex '^(tracker_sparql_(connection|cursor|builder|escape|error|value|get)_.*|tracker_namespace_manager_.*|tracker_resource_.*)'
 
diff --git a/src/libtracker-sparql/Makefile.am b/src/libtracker-sparql/Makefile.am
index 3f6925b6f..2482ab38d 100644
--- a/src/libtracker-sparql/Makefile.am
+++ b/src/libtracker-sparql/Makefile.am
@@ -24,6 +24,8 @@ libtracker_sparql_la_SOURCES =   \
 	tracker-cursor.vala                            \
 	tracker-namespace-manager.c                    \
 	tracker-namespace-manager.h                    \
+	tracker-resource.c                             \
+	tracker-resource.h                             \
 	tracker-utils.vala                             \
 	tracker-uri.c                                  \
 	tracker-ontologies.h \
@@ -52,6 +54,7 @@ libtracker_sparqlinclude_HEADERS =                     \
 	$(vala_header)                                 \
 	tracker-namespace-manager.h                    \
 	tracker-ontologies.h \
+	tracker-resource.h                             \
 	tracker-sparql.h                               \
 	tracker-version.h
 
diff --git a/src/libtracker-sparql/tracker-resource.c b/src/libtracker-sparql/tracker-resource.c
new file mode 100644
index 000000000..45c91f7c0
--- /dev/null
+++ b/src/libtracker-sparql/tracker-resource.c
@@ -0,0 +1,1013 @@
+/*
+ * 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 <glib.h>
+
+#include <string.h>
+
+#include "config.h"
+#include <tracker-uri.h>
+#include <tracker-resource.h>
+#include <tracker-ontologies.h>
+
+/* Necessary to be able to use the TrackerSparqlBuilder Vala code */
+#include "tracker-generated-no-checks.h"
+
+typedef struct {
+	char *identifier;
+	GHashTable *properties;
+	GHashTable *overwrite;
+} TrackerResourcePrivate;
+
+G_DEFINE_TYPE_WITH_PRIVATE (TrackerResource, tracker_resource, G_TYPE_OBJECT);
+#define GET_PRIVATE(object)  (tracker_resource_get_instance_private (object))
+
+/**
+ * SECTION: tracker-resource
+ * @short_description: Represents a single Tracker resource
+ * @title: TrackerResource
+ * @stability: Stable
+ * @include: tracker-resource.h
+ *
+ * <para>
+ * #TrackerResource keeps track of a set of properties for a given resource.
+ * The resulting data can be serialized in several ways.
+ * </para>
+ */
+
+static char *
+generate_blank_node_identifier (void)
+{
+	static gint64 counter = 0;
+
+	return g_strdup_printf("_:%" G_GINT64_FORMAT, counter ++);
+}
+
+/**
+ * TrackerResource:
+ *
+ * The <structname>TrackerResource</structname> object represents information
+ * about a given resource.
+ */
+
+enum {
+	PROP_0,
+
+	PROP_IDENTIFIER,
+};
+
+static void finalize     (GObject       *object);
+static void get_property (GObject       *object,
+                          guint          param_id,
+                          GValue        *value,
+                          GParamSpec    *pspec);
+static void set_property (GObject       *object,
+                          guint          param_id,
+                          const GValue  *value,
+                          GParamSpec    *pspec);
+
+
+static void
+tracker_resource_class_init (TrackerResourceClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+	object_class->finalize     = finalize;
+	object_class->get_property = get_property;
+	object_class->set_property = set_property;
+
+	g_object_class_install_property (object_class,
+	                                 PROP_IDENTIFIER,
+	                                 g_param_spec_string ("identifier",
+	                                                      "Identifier",
+	                                                      "Identifier",
+	                                                      NULL,
+	                                                      G_PARAM_READWRITE));
+}
+
+/* Destroy-notify function for the values stored in the hash table. */
+static void
+free_value (GValue *value)
+{
+	g_value_unset (value);
+	g_slice_free (GValue, value);
+}
+
+static void
+tracker_resource_init (TrackerResource *resource)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE(resource);
+
+	/* Values of properties */
+	priv->properties = g_hash_table_new_full (
+	    g_str_hash,
+	    g_str_equal,
+	    g_free,
+	    (GDestroyNotify) free_value);
+
+	/* TRUE for any property where we should delete any existing values. */
+	priv->overwrite = g_hash_table_new_full (
+	    g_str_hash,
+	    g_str_equal,
+	    g_free,
+	    NULL);
+}
+
+static void
+finalize (GObject *object)
+{
+	TrackerResourcePrivate *priv;
+
+	priv = GET_PRIVATE (TRACKER_RESOURCE (object));
+
+	if (priv->identifier) {
+		g_free (priv->identifier);
+	}
+
+	g_hash_table_unref (priv->overwrite);
+	g_hash_table_unref (priv->properties);
+
+	(G_OBJECT_CLASS (tracker_resource_parent_class)->finalize) (object);
+}
+
+static void
+get_property (GObject    *object,
+              guint       param_id,
+              GValue     *value,
+              GParamSpec *pspec)
+{
+	TrackerResourcePrivate *priv;
+
+	priv = GET_PRIVATE (TRACKER_RESOURCE (object));
+
+	switch (param_id) {
+		case PROP_IDENTIFIER:
+			g_value_set_string (value, priv->identifier);
+			break;
+		default:
+			G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+			break;
+	}
+}
+
+static void
+set_property (GObject      *object,
+              guint         param_id,
+              const GValue *value,
+              GParamSpec   *pspec)
+{
+	switch (param_id) {
+		case PROP_IDENTIFIER:
+			tracker_resource_set_identifier (TRACKER_RESOURCE (object), g_value_get_string (value));
+			break;
+		default:
+			G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+			break;
+	}
+}
+
+/**
+ * tracker_resource_new:
+ * @identifier: A string containing a URI
+ *
+ * Creates a TrackerResource instance.
+ *
+ * Returns: a newly created #TrackerResource. Free with g_object_unref() when done
+ *
+ * Since: 1.10
+ */
+TrackerResource *
+tracker_resource_new (const char *identifier)
+{
+	TrackerResource *resource;
+	GValue value = G_VALUE_INIT;
+
+	resource = g_object_new (TRACKER_TYPE_RESOURCE, NULL);
+
+	/* The identifier may be NULL, so I don't think we can pass it in the va_list
+	 * that g_object_new() accepts.
+	 */
+	g_value_init (&value, G_TYPE_STRING);
+	g_value_set_string (&value, identifier);
+	g_object_set_property (G_OBJECT (resource), "identifier", &value);
+	g_value_unset (&value);
+
+	return resource;
+}
+
+/* Difference between 'set' and 'add': when generating a SPARQL update, the
+ * setter will generate a corresponding DELETE, the adder will not. The setter
+ * will also overwrite existing values in the Resource object, while the adder
+ * will make a list.
+ */
+
+/**
+ * tracker_resource_set_gvalue:
+ * @self: the #TrackerResource
+ * @property_uri: a string identifying the property to set
+ * @value: an initialised #GValue
+ *
+ * State that the only value for the given property is 'value'. Any existing
+ * values for 'property' will be removed.
+ *
+ * When serialising to SPARQL, any properties that were set with this function
+ * will get a corresponding DELETE statement to remove any existing values in
+ * the database.
+ *
+ * You can pass any kind of GValue for @value, but serialization functions will
+ * normally only be able to serialize URIs/relationships and fundamental value
+ * types (string, int, etc.).
+ *
+ * Since: 1.10
+ */
+void
+tracker_resource_set_gvalue (TrackerResource *self,
+                             const char *property_uri,
+                             GValue *value)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (self);
+	GValue *our_value;
+
+	our_value = g_slice_new0 (GValue);
+	g_value_init (our_value, G_VALUE_TYPE (value));
+	g_value_copy (value, our_value);
+
+	g_hash_table_insert (priv->properties, g_strdup (property_uri), our_value);
+
+	g_hash_table_insert (priv->overwrite, g_strdup (property_uri), GINT_TO_POINTER (TRUE));
+};
+
+#define SET_PROPERTY_FOR_GTYPE(name, ctype, gtype, set_function)   \
+	void name (TrackerResource *self,                              \
+	           const char *property_uri,                           \
+	           ctype value)                                        \
+	{                                                              \
+		TrackerResourcePrivate *priv = GET_PRIVATE (self);         \
+		GValue *our_value;                                         \
+		                                                           \
+		our_value = g_slice_new0 (GValue);                         \
+		g_value_init (our_value, gtype);                           \
+		set_function (our_value, value);                           \
+		                                                           \
+		g_hash_table_insert (priv->properties,                    \
+		                      g_strdup (property_uri),             \
+		                      our_value);                          \
+		                                                           \
+		g_hash_table_insert (priv->overwrite,                     \
+		                      g_strdup (property_uri),             \
+		                      GINT_TO_POINTER (TRUE));             \
+	};
+
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_boolean, gboolean, G_TYPE_BOOLEAN, g_value_set_boolean);
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_double, double, G_TYPE_DOUBLE, g_value_set_double);
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_int, int, G_TYPE_INT, g_value_set_int);
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_int64, gint64, G_TYPE_INT64, g_value_set_int64);
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_relation, TrackerResource *, TRACKER_TYPE_RESOURCE, g_value_set_object);
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_string, const char *, G_TYPE_STRING, g_value_set_string);
+SET_PROPERTY_FOR_GTYPE (tracker_resource_set_uri, const char *, TRACKER_TYPE_URI, g_value_set_string);
+
+/**
+ * tracker_resource_add_gvalue:
+ * @self: the #TrackerResource
+ * @property_uri: a string identifying the property to set
+ * @value: an initialised #GValue
+ *
+ * Add 'value' to the list of values for given property.
+ *
+ * You can pass any kind of GValue for @value, but serialization functions will
+ * normally only be able to serialize URIs/relationships and fundamental value
+ * types (string, int, etc.).
+ *
+ * Since: 1.10
+ */
+void
+tracker_resource_add_gvalue (TrackerResource *self,
+                             const char *property_uri,
+                             GValue *value)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (self);
+	GValue *existing_value, *array_holder, *our_value;
+	GPtrArray *array;
+
+	existing_value = g_hash_table_lookup (priv->properties, property_uri);
+
+	if (existing_value && G_VALUE_HOLDS (existing_value, G_TYPE_PTR_ARRAY)) {
+		array = g_value_get_boxed (existing_value);
+		array_holder = existing_value;
+	} else {
+		array = g_ptr_array_new_with_free_func ((GDestroyNotify)free_value);
+		array_holder = g_slice_new0 (GValue);
+		g_value_init (array_holder, G_TYPE_PTR_ARRAY);
+		g_value_take_boxed (array_holder, array);
+
+		if (existing_value) {
+			/* The existing_value is owned by the hash table and will be freed
+			 * when we overwrite it with array_holder, so we need to allocate a
+			 * new value and give it to the ptrarray.
+			 */
+			our_value = g_slice_new0 (GValue);
+			g_value_init (our_value, G_VALUE_TYPE (existing_value));
+			g_value_copy (existing_value, our_value);
+			g_ptr_array_add (array, our_value);
+		}
+	}
+
+	our_value = g_slice_new0 (GValue);
+	g_value_init (our_value, G_VALUE_TYPE (value));
+	g_value_copy (value, our_value);
+
+	g_ptr_array_add (array, our_value);
+
+	if (array_holder != existing_value) {
+		g_hash_table_insert (priv->properties, g_strdup (property_uri), array_holder);
+	}
+};
+
+#define ADD_PROPERTY_FOR_GTYPE(name, ctype, gtype, set_function)         \
+	void name (TrackerResource *self,                                    \
+	           const char *property_uri,                                 \
+	           ctype value)                                              \
+	{                                                                    \
+		TrackerResourcePrivate *priv = GET_PRIVATE (self);               \
+		GValue *existing_value, *array_holder, *our_value;               \
+		GPtrArray *array;                                                \
+		                                                                 \
+		existing_value = g_hash_table_lookup (priv->properties,          \
+		                                      property_uri);             \
+		                                                                 \
+		if (existing_value && G_VALUE_HOLDS (existing_value,             \
+		                                     G_TYPE_PTR_ARRAY)) {        \
+			array = g_value_get_boxed (existing_value);                  \
+			array_holder = existing_value;                               \
+		} else {                                                         \
+			array = g_ptr_array_new_with_free_func (                     \
+			    (GDestroyNotify)free_value);                             \
+			array_holder = g_slice_new0 (GValue);                        \
+			g_value_init (array_holder, G_TYPE_PTR_ARRAY);               \
+			g_value_take_boxed (array_holder, array);                    \
+			                                                             \
+			if (existing_value) {                                        \
+				/* existing_value is owned by hash table */              \
+				our_value = g_slice_new0 (GValue);                       \
+				g_value_init (our_value, G_VALUE_TYPE(existing_value));  \
+				g_value_copy (existing_value, our_value);                \
+				g_ptr_array_add (array, our_value);                      \
+			}                                                            \
+		}                                                                \
+		                                                                 \
+		our_value = g_slice_new0 (GValue);                               \
+		g_value_init (our_value, gtype);                                 \
+		set_function (our_value, value);                                 \
+		                                                                 \
+		g_ptr_array_add (array, our_value);                              \
+		                                                                 \
+		if (array_holder != existing_value) {                            \
+			g_hash_table_insert (priv->properties,                       \
+			                     g_strdup (property_uri), array_holder); \
+		}                                                                \
+	};
+
+SET_PROPERTY_FOR_GTYPE (tracker_resource_add_boolean, gboolean, G_TYPE_BOOLEAN, g_value_set_boolean);
+ADD_PROPERTY_FOR_GTYPE (tracker_resource_add_double, double, G_TYPE_DOUBLE, g_value_set_double);
+ADD_PROPERTY_FOR_GTYPE (tracker_resource_add_int, int, G_TYPE_INT, g_value_set_int);
+ADD_PROPERTY_FOR_GTYPE (tracker_resource_add_int64, gint64, G_TYPE_INT64, g_value_set_int64);
+ADD_PROPERTY_FOR_GTYPE (tracker_resource_add_relation, TrackerResource *, TRACKER_TYPE_RESOURCE, g_value_set_object);
+ADD_PROPERTY_FOR_GTYPE (tracker_resource_add_string, const char *, G_TYPE_STRING, g_value_set_string);
+ADD_PROPERTY_FOR_GTYPE (tracker_resource_add_uri, const char *, TRACKER_TYPE_URI, g_value_set_string);
+
+
+/**
+ * tracker_resource_get_values:
+ * @self: the #TrackerResource
+ * @property_uri: a string identifying the property to look up
+ *
+ * Returns the list of all known values of the given property.
+ *
+ * Returns: a #GList of #GValue instances, which must be freed by the caller.
+ *
+ * Since: 1.10
+ */
+GList *tracker_resource_get_values (TrackerResource *self,
+                                    const char *property_uri)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (self);
+	GValue *value;
+
+	value = g_hash_table_lookup (priv->properties, property_uri);
+
+	if (value == NULL) {
+		return NULL;
+	}
+
+	if (G_VALUE_HOLDS (value, G_TYPE_PTR_ARRAY)) {
+		GList *result = NULL;
+		GPtrArray *array;
+		int i;
+
+		array = g_value_get_boxed (value);
+
+		for (i = 0; i < array->len; i++) {
+			value = g_ptr_array_index (array, i);
+			result = g_list_prepend (result, value);
+		};
+
+		return g_list_reverse (result);
+	} else {
+		return g_list_append (NULL, value);
+	}
+}
+
+#define GET_PROPERTY_FOR_GTYPE(name, ctype, gtype, get_function, no_value)  \
+	ctype name (TrackerResource *self,                                      \
+	            const char *property_uri)                                   \
+	{                                                                       \
+		TrackerResourcePrivate *priv = GET_PRIVATE (self);                  \
+		GValue *value;                                                      \
+		                                                                    \
+		value = g_hash_table_lookup (priv->properties, property_uri);       \
+		                                                                    \
+		if (value == NULL) {                                                \
+		    return no_value;                                                \
+		};                                                                  \
+		                                                                    \
+		if (G_VALUE_HOLDS (value, G_TYPE_PTR_ARRAY)) {                      \
+			GPtrArray *array;                                               \
+			array = g_value_get_boxed (value);                              \
+			if (array->len == 0) {                                          \
+				return no_value;                                            \
+			} else {                                                        \
+				value = g_ptr_array_index (array, 0);                       \
+			}                                                               \
+		}                                                                   \
+		                                                                    \
+		return get_function (value);                                        \
+	};
+
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_boolean, gboolean, G_TYPE_BOOLEAN, g_value_get_boolean, FALSE);
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_double, double, G_TYPE_DOUBLE, g_value_get_double, 0.0);
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_int, int, G_TYPE_INT, g_value_get_int, 0);
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_int64, gint64, G_TYPE_INT64, g_value_get_int64, 0);
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_relation, TrackerResource *, TRACKER_TYPE_RESOURCE, g_value_get_object, NULL);
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_string, const char *, G_TYPE_STRING, g_value_get_string, NULL);
+GET_PROPERTY_FOR_GTYPE (tracker_resource_get_first_uri, const char *, TRACKER_TYPE_URI, g_value_get_string, NULL);
+
+/**
+ * tracker_resource_get_identifier:
+ * @self: A #TrackerResource
+ *
+ * Returns the identifier of a resource.
+ *
+ * If the identifier was set to NULL, the identifier returned will be a unique
+ * SPARQL blank node identifier, such as "_:123".
+ *
+ * Returns: a string owned by the resource
+ *
+ * Since: 1.10
+ */
+const char *
+tracker_resource_get_identifier (TrackerResource *self)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (self);
+
+	return priv->identifier;
+}
+
+/**
+ * tracker_resource_set_identifier:
+ * @self: a #TrackerResource
+ * @identifier: (allow-none): a string identifying the resource
+ *
+ * Changes the identifier of a #TrackerResource. The identifier should be a
+ * URI or compact URI, but this is not necessarily enforced. Invalid
+ * identifiers may cause errors when serializing the resource or trying to
+ * insert the results in a database.
+ *
+ * If the identifier is set to NULL, a SPARQL blank node identifier such as
+ * "_:123" is assigned to the resource.
+ *
+ * Since: 1.10
+ */
+void
+tracker_resource_set_identifier (TrackerResource *self,
+                                 const char *identifier)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (self);
+
+	if (priv->identifier) {
+		g_free (priv->identifier);
+	}
+
+	if (identifier == NULL) {
+		/* We take NULL to mean "this is a blank node", and generate a
+		 * unique blank node identifier right away. This is easier than
+		 * leaving it NULL and trying to generate a blank node ID at
+		 * serialization time, and it means that the serialization
+		 * output is stable when called multiple times.
+		 */
+		priv->identifier = generate_blank_node_identifier ();
+	} else {
+		priv->identifier = g_strdup (identifier);
+	}
+}
+
+gint
+tracker_resource_identifier_compare_func (TrackerResource *resource,
+                                          const char *identifier)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (resource);
+
+	return strcmp (priv->identifier, identifier);
+}
+
+/**
+ * tracker_resource_compare:
+ * @self: A #TrackerResource
+ *
+ * Compare the identifiers of two TrackerResource instances. The resources
+ * are considered identical if they have the same identifier.
+ *
+ * Note that there can be false negatives with this simplistic approach: two
+ * resources may have different identifiers that actually refer to the same
+ * thing.
+ *
+ * Returns: 0 if the identifiers are the same, -1 or +1 otherwise
+ *
+ * Since: 1.10
+ */
+gint
+tracker_resource_compare (TrackerResource *a,
+                          TrackerResource *b)
+{
+    TrackerResourcePrivate *a_priv = GET_PRIVATE (a);
+    TrackerResourcePrivate *b_priv = GET_PRIVATE (b);
+
+    return strcmp (a_priv->identifier, b_priv->identifier);
+};
+
+
+/* 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
+ * to just dumping all known namespaces, but it makes the serializated
+ * output more readable.
+ */
+static void
+maybe_intern_prefix_of_compact_uri (TrackerNamespaceManager *all_namespaces,
+                                    TrackerNamespaceManager *interned_namespaces,
+                                    const char *uri)
+{
+	/* The TrackerResource API doesn't distinguish between compact URIs and full
+	 * URIs. This is fine as long as users don't add prefixes that can be
+	 * confused with URIs. Both URIs and CURIEs can have anything following
+	 * the ':', so without hardcoding knowledge of well-known protocols here,
+	 * we can't really tell if the user has done something dumb like defining a
+	 * "urn" prefix.
+	 */
+	char *prefix = g_uri_parse_scheme (uri);
+
+	if (prefix == NULL) {
+		g_warning ("Invalid URI or compact URI: %s", uri);
+		return;
+	}
+
+	if (tracker_namespace_manager_has_prefix (all_namespaces, prefix)) {
+		if (!tracker_namespace_manager_has_prefix (interned_namespaces, prefix)) {
+			const char *namespace = tracker_namespace_manager_lookup_prefix (all_namespaces, prefix);
+			tracker_namespace_manager_add_prefix (interned_namespaces, prefix, namespace);
+		}
+	}
+
+	g_free (prefix);
+}
+
+
+typedef struct {
+	TrackerNamespaceManager *all_namespaces, *our_namespaces;
+	GString *string;
+	GList *done_list;
+} GenerateTurtleData;
+
+void generate_turtle (TrackerResource *resource, GenerateTurtleData *data);
+
+void
+generate_nested_turtle_resource (TrackerResource *resource,
+                                 GenerateTurtleData *data)
+{
+	if (g_list_find_custom (data->done_list, resource, (GCompareFunc) tracker_resource_compare) == NULL) {
+		generate_turtle (resource, data);
+
+		g_string_append (data->string, "\n");
+
+		data->done_list = g_list_prepend (data->done_list, resource);
+	}
+}
+
+void
+generate_turtle_resources_foreach (gpointer key,
+                                   gpointer value_ptr,
+                                   gpointer user_data)
+{
+	const char *property = key;
+	const GValue *value = value_ptr;
+	GenerateTurtleData *data = user_data;
+	TrackerResource *resource;
+	int i;
+
+	if (G_VALUE_HOLDS (value, TRACKER_TYPE_RESOURCE)) {
+		resource = g_value_get_object (value);
+		generate_nested_turtle_resource (resource, data);
+	} else if (G_VALUE_HOLDS (value, G_TYPE_PTR_ARRAY)) {
+		GPtrArray *array = g_value_get_boxed (value);
+		const GValue *array_value;
+
+		for (i = 0; i < array->len; i++) {
+			array_value = g_ptr_array_index (array, i);
+
+			if (G_VALUE_HOLDS (array_value, TRACKER_TYPE_RESOURCE)) {
+				resource = g_value_get_object (array_value);
+				generate_nested_turtle_resource (resource, data);
+			}
+		}
+	}
+}
+
+static void
+generate_turtle_value (const GValue *value,
+                       GenerateTurtleData *data)
+{
+	GType type = G_VALUE_TYPE (value);
+	if (type == TRACKER_TYPE_URI) {
+		const char *uri = g_value_get_string (value);
+		maybe_intern_prefix_of_compact_uri (data->all_namespaces, data->our_namespaces, uri);
+		g_string_append_printf(data->string, "%s", uri);
+	} else if (type == TRACKER_TYPE_RESOURCE) {
+		TrackerResource *relation = TRACKER_RESOURCE (g_value_get_object (value));
+		g_string_append_printf(data->string, "<%s>", tracker_resource_get_identifier (relation));
+	} else if (type == G_TYPE_STRING) {
+		g_string_append_printf(data->string, "\"%s\"", g_value_get_string (value));
+	} else {
+		GValue str_value = G_VALUE_INIT;
+		g_value_init (&str_value, G_TYPE_STRING);
+		if (g_value_transform (value, &str_value)) {
+			g_string_append (data->string, g_value_get_string (&str_value));
+		} else {
+			g_warning ("Cannot serialize value of type %s to Turtle", G_VALUE_TYPE_NAME (value));
+		}
+		g_value_unset (&str_value);
+	}
+}
+
+void
+generate_turtle_property (const char *property,
+                          const GValue *value,
+                          GenerateTurtleData *data)
+{
+	g_string_append (data->string, property);
+	g_string_append (data->string, " ");
+	if (G_VALUE_HOLDS (value, G_TYPE_PTR_ARRAY)) {
+		int i;
+		GPtrArray *array = g_value_get_boxed (value);
+		if (array->len > 0) {
+			generate_turtle_value (g_ptr_array_index (array, 0), data);
+			for (i = 1; i < array->len; i++) {
+				g_string_append (data->string, " , ");
+				generate_turtle_value (g_ptr_array_index (array, i), data);
+			}
+		}
+	} else {
+		generate_turtle_value (value, data);
+	}
+}
+
+void
+generate_turtle (TrackerResource *resource,
+                 GenerateTurtleData *data)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (resource);
+	GString *result;
+	GHashTableIter iter;
+	const char *property;
+	const GValue *value;
+
+	/* First we recurse to any relations that aren't already in the done list */
+	g_hash_table_foreach (priv->properties, generate_turtle_resources_foreach, data);
+
+	g_string_append_printf (data->string, "<%s> ", priv->identifier);
+
+	g_hash_table_iter_init (&iter, priv->properties);
+	if (g_hash_table_iter_next (&iter, (gpointer *)&property, (gpointer *)&value))
+		while (TRUE) {
+			generate_turtle_property (property, value, data);
+
+			maybe_intern_prefix_of_compact_uri (data->all_namespaces, data->our_namespaces, property);
+
+			if (g_hash_table_iter_next (&iter, (gpointer *)&property, (gpointer *)&value)) {
+				g_string_append (data->string, " ;\n  ");
+			} else {
+				g_string_append (data->string, " .\n");
+				break;
+			}
+		}
+}
+
+/**
+ * tracker_resource_print_turtle:
+ * @resource: a #TrackerResource
+ *
+ * Serialize all the information in @resource as a Turtle document.
+ *
+ * The generated Turtle should correspond to this standard:
+ * <https://www.w3.org/TR/2014/REC-turtle-20140225/>
+ *
+ * Returns: a newly-allocated string
+ *
+ * Since: 1.10
+ */
+char *
+tracker_resource_print_turtle (TrackerResource *self,
+                               TrackerNamespaceManager *namespaces)
+{
+	GenerateTurtleData context;
+	char *prefixes;
+
+	context.all_namespaces = namespaces;
+	context.our_namespaces = tracker_namespace_manager_new ();
+	context.string = g_string_new ("");
+	context.done_list = NULL;
+
+	maybe_intern_prefix_of_compact_uri (context.all_namespaces, context.our_namespaces, tracker_resource_get_identifier(self));
+
+	generate_turtle (self, &context);
+
+	prefixes = tracker_namespace_manager_print_turtle (context.our_namespaces);
+	g_string_prepend (context.string, "\n");
+	g_string_prepend (context.string, prefixes);
+
+	g_object_unref (context.our_namespaces);
+	g_free (prefixes);
+
+	g_list_free (context.done_list);
+
+	return g_string_free (context.string, FALSE);
+}
+
+typedef struct {
+	TrackerNamespaceManager *namespaces;
+	TrackerSparqlBuilder *builder;
+	const char *graph_id;
+	GList *done_list;
+	GHashTable *overwrite_flags;
+} GenerateSparqlData;
+
+void generate_sparql_update (TrackerResource *resource, GenerateSparqlData *data);
+
+static void
+generate_sparql_relations_foreach (gpointer key,
+                                   gpointer value_ptr,
+                                   gpointer user_data)
+{
+	const char *property = key;
+	const GValue *value = value_ptr;
+	GenerateSparqlData *data = user_data;
+	GError *error = NULL;
+
+	if (G_VALUE_HOLDS (value, TRACKER_TYPE_RESOURCE)) {
+		TrackerResource *relation = g_value_get_object (value);
+
+		if (g_list_find_custom (data->done_list, relation, (GCompareFunc) tracker_resource_compare) == NULL) {
+			generate_sparql_update (relation, data);
+			data->done_list = g_list_prepend (data->done_list, relation);
+		}
+	}
+}
+
+static char *
+variable_name_for_property (const char *property) {
+	return g_strcanon (g_strdup (property),
+	                   "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890",
+	                   '_');
+}
+
+static void
+generate_sparql_deletes_foreach (gpointer key,
+                                 gpointer value_ptr,
+                                 gpointer user_data)
+{
+	const char *property = key;
+	const GValue *value = value_ptr;
+	GenerateSparqlData *data = user_data;
+
+	/* Whether to generate the DELETE is based on whether set_value was ever
+	 * called for this property. That's tracked in a hash table.
+	 */
+	if (g_hash_table_lookup (data->overwrite_flags, property)) {
+		char *variable_name = variable_name_for_property (property);
+		tracker_sparql_builder_predicate (data->builder, property);
+		tracker_sparql_builder_object_variable (data->builder, variable_name);
+		g_free (variable_name);
+	}
+}
+
+static void
+append_value_to_sparql_builder (const GValue *value,
+                                TrackerSparqlBuilder *builder)
+{
+	GType type = G_VALUE_TYPE (value);
+	if (type == G_TYPE_BOOLEAN) {
+		tracker_sparql_builder_object_boolean (builder, g_value_get_boolean (value));
+	} else if (type == G_TYPE_DATE) {
+		/* tracker_sparql_builder_object_date() exists, but it requires a
+		 * time_t, and GDate and GDateTime don't provide those conveniently.
+		 */
+		char literal[256];
+		g_date_strftime (literal, 256,
+		                 "\"%Y-%m-%d%z\"^^<http://www.w3.org/2001/XMLSchema#date>",
+		                 g_value_get_boxed (value));
+		tracker_sparql_builder_object (builder, literal);
+	} else if (type == G_TYPE_DATE_TIME) {
+		char *literal;
+		literal = g_date_time_format (g_value_get_boxed (value),
+		                              "\"%Y-%m-%dT%H:%M:%s%z\"^^<http://www.w3.org/2001/XMLSchema#dateTime>");
+		tracker_sparql_builder_object (builder, literal);
+		g_free (literal);
+	} else if (type == G_TYPE_DOUBLE) {
+		tracker_sparql_builder_object_double (builder, g_value_get_double (value));
+	} else if (type == G_TYPE_FLOAT) {
+		tracker_sparql_builder_object_double (builder, g_value_get_float (value));
+	} else if (type == G_TYPE_CHAR) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_schar (value));
+	} else if (type == G_TYPE_INT) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_int (value));
+	} else if (type == G_TYPE_INT64) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_int64 (value));
+	} else if (type == G_TYPE_LONG) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_long (value));
+	} else if (type == G_TYPE_UCHAR) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_uchar (value));
+	} else if (type == G_TYPE_UINT) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_uint (value));
+	} else if (type == G_TYPE_ULONG) {
+		tracker_sparql_builder_object_int64 (builder, g_value_get_ulong (value));
+	} else if (type == G_TYPE_UINT64) {
+		g_warning ("Cannot serialize uint64 types to SPARQL. Use int64.");
+		tracker_sparql_builder_object (builder, "null");
+	} else if (type == G_TYPE_STRING) {
+		tracker_sparql_builder_object_string (builder, g_value_get_string (value));
+	} else if (type == TRACKER_TYPE_URI) {
+		tracker_sparql_builder_object (builder, g_value_get_string (value));
+	} else if (type == TRACKER_TYPE_RESOURCE) {
+		TrackerResource *relation = TRACKER_RESOURCE (g_value_get_object (value));
+		tracker_sparql_builder_object_iri (builder, tracker_resource_get_identifier (relation));
+	} else {
+		g_warning ("Cannot serialize value of type %s to SPARQL", G_VALUE_TYPE_NAME (value));
+		tracker_sparql_builder_object (builder, "null");
+	}
+}
+
+static void
+generate_sparql_inserts_foreach (gpointer key,
+                                 gpointer value_ptr,
+                                 gpointer user_data)
+{
+	const char *property = key;
+	const GValue *value = value_ptr;
+	GenerateSparqlData *data = user_data;
+	char *full_property;
+
+	full_property = tracker_namespace_manager_expand_uri (data->namespaces, property);
+
+	/* The caller should have already set rdf:type */
+	if (strcmp (full_property, TRACKER_PREFIX_RDF "type") == 0 || strcmp (property, "rdf:type") == 0) {
+		g_free (full_property);
+		return;
+	}
+
+	tracker_sparql_builder_predicate (data->builder, property);
+
+	g_free (full_property);
+
+	if (G_VALUE_TYPE (value) == G_TYPE_PTR_ARRAY) {
+		g_ptr_array_foreach (g_value_get_boxed (value), (GFunc)append_value_to_sparql_builder, data->builder);
+	} else {
+		append_value_to_sparql_builder (value, data->builder);
+	}
+}
+
+void
+generate_sparql_update (TrackerResource *resource,
+                        GenerateSparqlData *data)
+{
+	TrackerResourcePrivate *priv = GET_PRIVATE (resource);
+	TrackerSparqlBuilder *builder = data->builder;
+	GValue *type_value;
+
+	if (! priv->identifier) {
+		g_warning ("Main resource must have an identifier.");
+		return;
+	}
+
+	g_return_if_fail (tracker_sparql_builder_get_state (builder) == TRACKER_SPARQL_BUILDER_STATE_UPDATE);
+
+	/* First, forget everything you know */
+	tracker_sparql_builder_delete_open (builder, NULL);
+	tracker_sparql_builder_delete_close (builder);
+	tracker_sparql_builder_where_open (builder);
+	if (data->graph_id) {
+		tracker_sparql_builder_graph_open (builder, data->graph_id);
+	}
+
+	tracker_sparql_builder_subject_iri (builder, priv->identifier);
+
+	data->overwrite_flags = priv->overwrite;
+	g_hash_table_foreach (priv->properties, generate_sparql_deletes_foreach, data);
+
+	if (data->graph_id) {
+		tracker_sparql_builder_graph_close (builder);
+	}
+	tracker_sparql_builder_where_close (builder);
+
+	/* Now emit any sub-resources. */
+	g_hash_table_foreach (priv->properties, generate_sparql_relations_foreach, data);
+
+	/* Finally insert the rest of the data */
+
+	/* Passing the graph directly to insert_open causes it to generate a
+	 * non-standard 'INSERT INTO <graph>' statement, while calling graph_open
+	 * separately causes it to generate INSERT { GRAPH { .. } }. See
+	 * <https://bugzilla.gnome.org/show_bug.cgi?id=658838>.
+	 */
+	tracker_sparql_builder_insert_open (builder, NULL);
+	if (data->graph_id) {
+		tracker_sparql_builder_graph_open (builder, data->graph_id);
+	}
+
+	tracker_sparql_builder_subject_iri (builder, priv->identifier);
+
+	/* rdf:type needs to be first, otherwise you'll see 'subject x is not in domain y'
+	 * errors for the properties you try to set.
+	 */
+	type_value = g_hash_table_lookup (priv->properties, "rdf:type");
+	if (type_value != NULL) {
+		tracker_sparql_builder_predicate (builder, "a");
+		if (G_VALUE_TYPE (type_value) == G_TYPE_PTR_ARRAY) {
+			g_ptr_array_foreach (g_value_get_boxed (type_value), (GFunc)append_value_to_sparql_builder, builder);
+		} else {
+			append_value_to_sparql_builder (type_value, builder);
+		}
+	}
+
+	g_hash_table_foreach (priv->properties, generate_sparql_inserts_foreach, data);
+
+	if (data->graph_id) {
+		tracker_sparql_builder_graph_close (builder);
+	}
+	tracker_sparql_builder_insert_close (builder);
+}
+
+/**
+ * tracker_resource_generate_sparql_update:
+ * @self: a #TrackerResource
+ * @builder: a #TrackerSparqlBuilder where the result will be returned
+ *
+ * Generates a SPARQL command to update a database with the information
+ * stored in @resource.
+ *
+ * Since: 1.10
+ */
+void
+tracker_resource_generate_sparql_update (TrackerResource *resource,
+                                         TrackerSparqlBuilder *builder,
+                                         TrackerNamespaceManager *namespaces,
+                                         const char *graph_id)
+{
+	GenerateSparqlData context;
+
+	context.namespaces = namespaces;
+	context.builder = builder;
+	context.graph_id = graph_id;
+
+	/* Resources can be recursive, and may have repeated or even cyclic
+	 * relationships. This list keeps track of what we already processed.
+	 */
+	context.done_list = NULL;
+
+	generate_sparql_update (resource, &context);
+
+	g_list_free (context.done_list);
+}
diff --git a/src/libtracker-sparql/tracker-resource.h b/src/libtracker-sparql/tracker-resource.h
new file mode 100644
index 000000000..d17fdd252
--- /dev/null
+++ b/src/libtracker-sparql/tracker-resource.h
@@ -0,0 +1,82 @@
+/*
+ * 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_RESOURCE_H__
+#define __LIBTRACKER_RESOURCE_H__
+
+#include <glib-object.h>
+
+#include "tracker-namespace-manager.h"
+
+G_BEGIN_DECLS
+
+/* This is defined in the Vala code, which we can't include here
+ * because it might not yet have been built.
+ */
+typedef struct _TrackerSparqlBuilder TrackerSparqlBuilder;
+
+#define TRACKER_TYPE_RESOURCE tracker_resource_get_type()
+G_DECLARE_DERIVABLE_TYPE (TrackerResource, tracker_resource, TRACKER, RESOURCE, GObject)
+
+struct _TrackerResourceClass
+{
+	GObjectClass parent_class;
+};
+
+TrackerResource *tracker_resource_new (const char *identifier);
+
+void tracker_resource_set_gvalue (TrackerResource *self, const char *property_uri, GValue *value);
+void tracker_resource_set_boolean (TrackerResource *self, const char *property_uri, gboolean value);
+void tracker_resource_set_double (TrackerResource *self, const char *property_uri, double value);
+void tracker_resource_set_int (TrackerResource *self, const char *property_uri, int value);
+void tracker_resource_set_int64 (TrackerResource *self, const char *property_uri, gint64 value);
+void tracker_resource_set_relation (TrackerResource *self, const char *property_uri, TrackerResource *resource);
+void tracker_resource_set_string (TrackerResource *self, const char *property_uri, const char *value);
+void tracker_resource_set_uri (TrackerResource *self, const char *property_uri, const char *value);
+
+void tracker_resource_add_gvalue (TrackerResource *self, const char *property_uri, GValue *value);
+void tracker_resource_add_boolean (TrackerResource *self, const char *property_uri, gboolean value);
+void tracker_resource_add_double (TrackerResource *self, const char *property_uri, double value);
+void tracker_resource_add_int (TrackerResource *self, const char *property_uri, int value);
+void tracker_resource_add_int64 (TrackerResource *self, const char *property_uri, gint64 value);
+void tracker_resource_add_relation (TrackerResource *self, const char *property_uri, TrackerResource *resource);
+void tracker_resource_add_string (TrackerResource *self, const char *property_uri, const char *value);
+void tracker_resource_add_uri (TrackerResource *self, const char *property_uri, const char *value);
+
+GList *tracker_resource_get_values (TrackerResource *self, const char *property_uri);
+
+gboolean tracker_resource_get_first_boolean (TrackerResource *self, const char *property_uri);
+double tracker_resource_get_first_double (TrackerResource *self, const char *property_uri);
+int tracker_resource_get_first_int (TrackerResource *self, const char *property_uri);
+gint64 tracker_resource_get_first_int64 (TrackerResource *self, const char *property_uri);
+TrackerResource *tracker_resource_get_first_relation (TrackerResource *self, const char *property_uri);
+const char *tracker_resource_get_first_string (TrackerResource *self, const char *property_uri);
+const char *tracker_resource_get_first_uri (TrackerResource *self, const char *property_uri);
+
+const char *tracker_resource_get_identifier (TrackerResource *self);
+void tracker_resource_set_identifier (TrackerResource *self, const char *identifer);
+gint tracker_resource_identifier_compare_func (TrackerResource *resource, const char *identifier);
+
+char *tracker_resource_print_turtle(TrackerResource *self, TrackerNamespaceManager *namespaces);
+
+void tracker_resource_generate_sparql_update (TrackerResource *self, TrackerSparqlBuilder *builder, TrackerNamespaceManager *namespaces, const char *graph_id);
+
+G_END_DECLS
+
+#endif /* __LIBTRACKER_RESOURCE_H__ */
diff --git a/src/libtracker-sparql/tracker-sparql.h b/src/libtracker-sparql/tracker-sparql.h
index ee7eda7d3..4de6f1f6e 100644
--- a/src/libtracker-sparql/tracker-sparql.h
+++ b/src/libtracker-sparql/tracker-sparql.h
@@ -25,6 +25,7 @@
 #include <libtracker-sparql/tracker-version.h>
 #include <libtracker-sparql/tracker-uri.h>
 #include <libtracker-sparql/tracker-ontologies.h>
+#include <libtracker-sparql/tracker-resource.h>
 #include <libtracker-sparql/tracker-generated.h>
 
 #undef __LIBTRACKER_SPARQL_INSIDE__
diff --git a/src/libtracker-sparql/tracker-uri.h b/src/libtracker-sparql/tracker-uri.h
index 9ea811654..4ffa1e651 100644
--- a/src/libtracker-sparql/tracker-uri.h
+++ b/src/libtracker-sparql/tracker-uri.h
@@ -28,6 +28,8 @@ G_BEGIN_DECLS
 #error "only <libtracker-sparql/tracker-sparql.h> must be included directly."
 #endif
 
+GType tracker_uri_get_type (void);
+
 #define TRACKER_TYPE_URI tracker_uri_get_type()
 
 /* The public functions in tracker-uri.c are prototyped in the generated Vala
diff --git a/tests/libtracker-sparql/Makefile.am b/tests/libtracker-sparql/Makefile.am
index 1f4cac03e..e1dedc653 100644
--- a/tests/libtracker-sparql/Makefile.am
+++ b/tests/libtracker-sparql/Makefile.am
@@ -3,6 +3,7 @@ include $(top_srcdir)/Makefile.decl
 noinst_PROGRAMS += $(test_programs)
 
 test_programs = \
+	tracker-resource-test                          \
 	tracker-sparql-test                            \
 	tracker-gb-737023-test
 
@@ -18,6 +19,8 @@ LDADD =                                                \
 	$(BUILD_LIBS)                                  \
 	$(LIBTRACKER_SPARQL_LIBS)
 
+tracker_resource_test_SOURCES = tracker-resource-test.c
+
 tracker_sparql_test_SOURCES = tracker-sparql-test.c
 
 tracker_gb_737023_test_SOURCES = tracker-gb-737023.c
diff --git a/tests/libtracker-sparql/tracker-resource-test.c b/tests/libtracker-sparql/tracker-resource-test.c
new file mode 100644
index 000000000..92537b9fc
--- /dev/null
+++ b/tests/libtracker-sparql/tracker-resource-test.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2016, Sam Thursfield <sam@afuera.me.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include "config.h"
+
+#include <locale.h>
+
+#include <libtracker-sparql/tracker-resource.h>
+
+static void
+test_resource_get_empty (void)
+{
+	TrackerResource *resource;
+
+	resource = tracker_resource_new ("http://example.com/resource");
+
+	g_assert (tracker_resource_get_values (resource, "http://example.com/0") == NULL);
+
+	g_assert (tracker_resource_get_first_double (resource, "http://example.com/0") == 0.0);
+	g_assert (tracker_resource_get_first_int (resource, "http://example.com/0") == 0);
+	g_assert (tracker_resource_get_first_int64 (resource, "http://example.com/0") == 0);
+	g_assert (tracker_resource_get_first_string (resource, "http://example.com/0") == NULL);
+	g_assert (tracker_resource_get_first_uri (resource, "http://example.com/0") == NULL);
+
+	g_object_unref (resource);
+}
+
+static void
+test_resource_get_set_simple (void)
+{
+	TrackerResource *resource;
+
+	resource = tracker_resource_new ("http://example.com/resource");
+
+	tracker_resource_set_double (resource, "http://example.com/1", 0.6);
+	tracker_resource_set_int (resource, "http://example.com/2", 60);
+	tracker_resource_set_int64 (resource, "http://example.com/3", 123456789);
+	tracker_resource_set_string (resource, "http://example.com/4", "Hello");
+	tracker_resource_set_uri (resource, "http://example.com/5", "http://example.com/");
+
+	g_assert (tracker_resource_get_first_double (resource, "http://example.com/1") == 0.6);
+	g_assert_cmpint (tracker_resource_get_first_int (resource, "http://example.com/2"), ==, 60);
+	g_assert (tracker_resource_get_first_int64 (resource, "http://example.com/3") == 123456789);
+	g_assert_cmpstr (tracker_resource_get_first_string (resource, "http://example.com/4"), ==, "Hello");
+	g_assert_cmpstr (tracker_resource_get_first_uri (resource, "http://example.com/5"), ==, "http://example.com/");
+
+	g_object_unref (resource);
+}
+
+static void
+test_resource_get_set_gvalue (void)
+{
+	TrackerResource *resource;
+	GValue value = G_VALUE_INIT;
+	GList *list;
+
+	resource = tracker_resource_new ("http://example.com/resource");
+
+	g_value_init (&value, G_TYPE_STRING);
+	g_value_set_string (&value, "xyzzy");
+	tracker_resource_set_gvalue (resource, "http://example.com/0", &value);
+
+	list = tracker_resource_get_values (resource, "http://example.com/0");
+	g_assert_cmpint (g_list_length (list), ==, 1);
+
+	g_object_unref (resource);
+}
+
+#define RANDOM_GVALUE_TYPE (G_TYPE_HASH_TABLE)
+
+static void
+init_gvalue_with_random_type (GValue *value)
+{
+	/* Hash table is used here as an "unexpected" value type. The rationale
+	 * is that while makes no sense to do this in practice, the code shouldn't
+	 * crash or assert.
+	 */
+	g_value_init (value, G_TYPE_HASH_TABLE);
+	g_value_take_boxed (value, g_hash_table_new (NULL, NULL));
+}
+
+static void
+test_resource_get_set_many (void)
+{
+	TrackerResource *resource;
+	GValue value = G_VALUE_INIT;
+	GList *list;
+
+	resource = tracker_resource_new ("http://example.com/resource");
+
+	/* All the add_* functions except for add_gvalue are generated using the
+	 * same macro, so we only need to test one or two of them here.
+	 */
+	tracker_resource_add_int (resource, "http://example.com/0", 60);
+	tracker_resource_add_string (resource, "http://example.com/0", "Hello");
+
+	init_gvalue_with_random_type (&value);
+	tracker_resource_add_gvalue (resource, "http://example.com/0", &value);
+	g_value_unset (&value);
+
+	list = tracker_resource_get_values (resource, "http://example.com/0");
+	g_assert_cmpint (g_list_length (list), ==, 3);
+
+	g_assert_cmpint (g_value_get_int (list->data), ==, 60);
+	g_assert_cmpstr (g_value_get_string (list->next->data), ==, "Hello");
+	g_assert (G_VALUE_HOLDS (list->next->next->data, RANDOM_GVALUE_TYPE));
+
+	g_list_free_full (list, (GDestroyNotify) g_value_unset);
+
+	g_object_unref (resource);
+}
+
+int
+main (int    argc,
+      char **argv)
+{
+	g_test_init (&argc, &argv, NULL);
+
+	g_test_message ("Testing Tracker resource abstraction");
+
+	g_test_add_func ("/libtracker-sparql/tracker-resource/get_empty",
+	                 test_resource_get_empty);
+	g_test_add_func ("/libtracker-sparql/tracker-resource/get_set_simple",
+	                 test_resource_get_set_simple);
+	g_test_add_func ("/libtracker-sparql/tracker-resource/get_set_gvalue",
+	                 test_resource_get_set_gvalue);
+	g_test_add_func ("/libtracker-sparql/tracker-resource/get_set_many",
+	                 test_resource_get_set_many);
+
+	return g_test_run ();
+}