[gnome-photos] Add PhotosCameraCache

[Debarshi Ray <debarshir src gnome org>]

commit bce044f715b23e22f7a282317276770fc15a88b3
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Aug 12 11:57:33 2013 +0200

    Add PhotosCameraCache

 src/Makefile.am            |    2 +
 src/photos-camera-cache.c  |  224 ++++++++++++++++++++++++++++++++++++++++++++
 src/photos-camera-cache.h  |   82 ++++++++++++++++
 src/photos-query-builder.c |   12 +++
 src/photos-query-builder.h |    2 +
 5 files changed, 322 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 5bff585..0e95e5d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -68,6 +68,8 @@ gnome_photos_SOURCES = \
        photos-base-manager.h \
        photos-base-item.c \
        photos-base-item.h \
+       photos-camera-cache.c \
+       photos-camera-cache.h \
        photos-collection-icon-watcher.c \
        photos-collection-icon-watcher.h \
        photos-collection-manager.c \
diff --git a/src/photos-camera-cache.c b/src/photos-camera-cache.c
new file mode 100644
index 0000000..931136a
--- /dev/null
+++ b/src/photos-camera-cache.c
@@ -0,0 +1,224 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2013 Red Hat, Inc.
+ *
+ * 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 <tracker-sparql.h>
+
+#include "photos-camera-cache.h"
+#include "photos-query-builder.h"
+#include "photos-tracker-queue.h"
+
+
+struct _PhotosCameraCachePrivate
+{
+  GHashTable *cache;
+  PhotosTrackerQueue *queue;
+};
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (PhotosCameraCache, photos_camera_cache, G_TYPE_OBJECT);
+
+
+static void
+photos_camera_cache_cursor_next (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  GTask *task = G_TASK (user_data);
+  PhotosCameraCache *self;
+  PhotosCameraCachePrivate *priv;
+  TrackerSparqlCursor *cursor = TRACKER_SPARQL_CURSOR (source_object);
+  GError *error;
+  const gchar *manufacturer;
+  const gchar *model;
+  gchar *camera;
+  gpointer key;
+
+  self = PHOTOS_CAMERA_CACHE (g_task_get_source_object (task));
+  priv = self->priv;
+
+  error = NULL;
+  tracker_sparql_cursor_next_finish (cursor, res, &error);
+  if (error != NULL)
+    {
+      g_task_return_error (task, error);
+      goto out;
+    }
+
+  manufacturer = tracker_sparql_cursor_get_string (cursor, 0, NULL);
+  model = tracker_sparql_cursor_get_string (cursor, 1, NULL);
+
+  if (g_str_has_prefix (model, manufacturer))
+    camera = g_strdup (model);
+  else
+    camera = g_strconcat (manufacturer, " ", model, NULL);
+
+  key = g_task_get_task_data (task);
+  g_hash_table_insert (priv->cache, key, camera);
+
+  g_task_return_pointer (task, g_strdup (camera), g_free);
+
+ out:
+  tracker_sparql_cursor_close (cursor);
+  g_object_unref (task);
+}
+
+
+static void
+photos_camera_cache_equipment_query_executed (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  GTask *task = G_TASK (user_data);
+  TrackerSparqlConnection *connection = TRACKER_SPARQL_CONNECTION (source_object);
+  TrackerSparqlCursor *cursor;
+  GError *error;
+
+  error = NULL;
+  cursor = tracker_sparql_connection_query_finish (connection, res, &error);
+  if (error != NULL)
+    {
+      g_task_return_error (task, error);
+      return;
+    }
+
+  tracker_sparql_cursor_next_async (cursor, NULL, photos_camera_cache_cursor_next, g_object_ref (task));
+  g_object_unref (cursor);
+}
+
+
+static GObject *
+photos_camera_cache_constructor (GType type, guint n_construct_params, GObjectConstructParam 
*construct_params)
+{
+  static GObject *self = NULL;
+
+  if (self == NULL)
+    {
+      self = G_OBJECT_CLASS (photos_camera_cache_parent_class)->constructor (type,
+                                                                             n_construct_params,
+                                                                             construct_params);
+      g_object_add_weak_pointer (self, (gpointer) &self);
+      return self;
+    }
+
+  return g_object_ref (self);
+}
+
+
+static void
+photos_camera_cache_dispose (GObject *object)
+{
+  PhotosCameraCache *self = PHOTOS_CAMERA_CACHE (object);
+
+  g_clear_object (&self->priv->queue);
+
+  G_OBJECT_CLASS (photos_camera_cache_parent_class)->dispose (object);
+}
+
+
+static void
+photos_camera_cache_finalize (GObject *object)
+{
+  PhotosCameraCache *self = PHOTOS_CAMERA_CACHE (object);
+
+  g_hash_table_unref (self->priv->cache);
+
+  G_OBJECT_CLASS (photos_camera_cache_parent_class)->finalize (object);
+}
+
+
+static void
+photos_camera_cache_init (PhotosCameraCache *self)
+{
+  PhotosCameraCachePrivate *priv;
+
+  self->priv = photos_camera_cache_get_instance_private (self);
+  priv = self->priv;
+
+  priv->cache = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, g_free);
+  priv->queue = photos_tracker_queue_new ();
+}
+
+
+static void
+photos_camera_cache_class_init (PhotosCameraCacheClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->constructor = photos_camera_cache_constructor;
+  object_class->dispose = photos_camera_cache_dispose;
+  object_class->finalize = photos_camera_cache_finalize;
+}
+
+
+PhotosCameraCache *
+photos_camera_cache_new (void)
+{
+  return g_object_new (PHOTOS_TYPE_CAMERA_CACHE, NULL);
+}
+
+
+void
+photos_camera_cache_get_camera_async (PhotosCameraCache *self,
+                                      GQuark id,
+                                      GCancellable *cancellable,
+                                      GAsyncReadyCallback callback,
+                                      gpointer user_data)
+{
+  PhotosCameraCachePrivate *priv = self->priv;
+  GTask *task;
+  PhotosQuery *query;
+  const gchar *camera;
+
+  task = g_task_new (self, cancellable, callback, user_data);
+  g_task_set_check_cancellable (task, TRUE);
+  g_task_set_source_tag (task, photos_camera_cache_get_camera_async);
+  g_task_set_task_data (task, GUINT_TO_POINTER (id), NULL);
+
+  camera = g_hash_table_lookup (priv->cache, GUINT_TO_POINTER (id));
+  if (camera != NULL)
+    {
+      g_task_return_pointer (task, g_strdup (camera), g_free);
+      goto out;
+    }
+
+  query = photos_query_builder_equipment_query (id);
+  photos_tracker_queue_select (priv->queue,
+                               query->sparql,
+                               cancellable,
+                               photos_camera_cache_equipment_query_executed,
+                               g_object_ref (task),
+                               g_object_unref);
+  photos_query_free (query);
+
+ out:
+  g_object_unref (task);
+}
+
+
+gchar *
+photos_camera_cache_get_camera_finish (PhotosCameraCache *self, GAsyncResult *res, GError **error)
+{
+  GTask *task = G_TASK (res);
+
+  g_return_val_if_fail (g_task_is_valid (res, self), NULL);
+  g_return_val_if_fail (g_task_get_source_tag (task) == photos_camera_cache_get_camera_async, NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  return g_task_propagate_pointer (task, error);
+}
diff --git a/src/photos-camera-cache.h b/src/photos-camera-cache.h
new file mode 100644
index 0000000..f3cc6d7
--- /dev/null
+++ b/src/photos-camera-cache.h
@@ -0,0 +1,82 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2013 Red Hat, Inc.
+ *
+ * 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.
+ */
+
+#ifndef PHOTOS_CAMERA_CACHE_H
+#define PHOTOS_CAMERA_CACHE_H
+
+#include <gio/gio.h>
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_CAMERA_CACHE (photos_camera_cache_get_type ())
+
+#define PHOTOS_CAMERA_CACHE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_CAMERA_CACHE, PhotosCameraCache))
+
+#define PHOTOS_CAMERA_CACHE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_CAMERA_CACHE, PhotosCameraCacheClass))
+
+#define PHOTOS_IS_CAMERA_CACHE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_CAMERA_CACHE))
+
+#define PHOTOS_IS_CAMERA_CACHE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_CAMERA_CACHE))
+
+#define PHOTOS_CAMERA_CACHE_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_CAMERA_CACHE, PhotosCameraCacheClass))
+
+typedef struct _PhotosCameraCache        PhotosCameraCache;
+typedef struct _PhotosCameraCacheClass   PhotosCameraCacheClass;
+typedef struct _PhotosCameraCachePrivate PhotosCameraCachePrivate;
+
+struct _PhotosCameraCache
+{
+  GObject parent_instance;
+  PhotosCameraCachePrivate *priv;
+};
+
+struct _PhotosCameraCacheClass
+{
+  GObjectClass parent_class;
+};
+
+GType                  photos_camera_cache_get_type               (void) G_GNUC_CONST;
+
+PhotosCameraCache     *photos_camera_cache_new                    (void);
+
+void                   photos_camera_cache_get_camera_async       (PhotosCameraCache *self,
+                                                                   GQuark id,
+                                                                   GCancellable *cancellable,
+                                                                   GAsyncReadyCallback callback,
+                                                                   gpointer user_data);
+
+gchar                 *photos_camera_cache_get_camera_finish      (PhotosCameraCache *self,
+                                                                   GAsyncResult *res,
+                                                                   GError **error);
+
+G_END_DECLS
+
+#endif /* PHOTOS_CAMERA_CACHE_H */
diff --git a/src/photos-query-builder.c b/src/photos-query-builder.c
index 6b0db9d..bcf1ab5 100644
--- a/src/photos-query-builder.c
+++ b/src/photos-query-builder.c
@@ -276,6 +276,18 @@ photos_query_builder_delete_resource_query (const gchar *resource)
 
 
 PhotosQuery *
+photos_query_builder_equipment_query (GQuark equipment)
+{
+  const gchar *resource;
+  gchar *sparql;
+
+  resource = g_quark_to_string (equipment);
+  sparql = g_strdup_printf ("SELECT nfo:manufacturer (<%s>) nfo:model (<%s>) WHERE {}", resource, resource);
+  return photos_query_new (sparql);
+}
+
+
+PhotosQuery *
 photos_query_builder_fetch_collections_query (const gchar *resource)
 {
   gchar *sparql;
diff --git a/src/photos-query-builder.h b/src/photos-query-builder.h
index 92a1353..d2cf5c5 100644
--- a/src/photos-query-builder.h
+++ b/src/photos-query-builder.h
@@ -39,6 +39,8 @@ PhotosQuery  *photos_query_builder_count_query (gint flags);
 
 PhotosQuery  *photos_query_builder_delete_resource_query (const gchar *resource);
 
+PhotosQuery  *photos_query_builder_equipment_query (GQuark equipment);
+
 PhotosQuery  *photos_query_builder_fetch_collections_query (const gchar *resource);
 
 PhotosQuery  *photos_query_builder_global_query        (gint flags);