[gnome-photos] Add PhotosSingleItemJob

[Debarshi Ray <debarshir src gnome org>]

commit 46f380ceb3a39f6fb33bc714414108b0ac5438d8
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Aug 17 03:30:30 2012 +0200

    Add PhotosSingleItemJob

 src/Makefile.am              |    2 +
 src/photos-single-item-job.c |  213 ++++++++++++++++++++++++++++++++++++++++++
 src/photos-single-item-job.h |   79 ++++++++++++++++
 3 files changed, 294 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 4c224a8..a52b991 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -79,6 +79,8 @@ gnome_photos_SOURCES = \
 	photos-selection-toolbar.h \
 	photos-settings.c \
 	photos-settings.h \
+	photos-single-item-job.c \
+	photos-single-item-job.h \
 	photos-source.c \
 	photos-source.h \
 	photos-source-manager.c \
diff --git a/src/photos-single-item-job.c b/src/photos-single-item-job.c
new file mode 100644
index 0000000..1e2d295
--- /dev/null
+++ b/src/photos-single-item-job.c
@@ -0,0 +1,213 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 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 <glib.h>
+
+#include "photos-query.h"
+#include "photos-query-builder.h"
+#include "photos-single-item-job.h"
+#include "photos-tracker-queue.h"
+
+
+struct _PhotosSingleItemJobPrivate
+{
+  PhotosSingleItemJobCallback callback;
+  PhotosTrackerQueue *queue;
+  TrackerSparqlCursor *cursor;
+  gchar *urn;
+  gpointer user_data;
+};
+
+enum
+{
+  PROP_0,
+  PROP_URN
+};
+
+
+G_DEFINE_TYPE (PhotosSingleItemJob, photos_single_item_job, G_TYPE_OBJECT);
+
+
+static void
+photos_single_item_job_emit_callback (PhotosSingleItemJob *self)
+{
+  PhotosSingleItemJobPrivate *priv = self->priv;
+
+  if (priv->callback == NULL)
+    return;
+
+  (*priv->callback) (priv->cursor, priv->user_data);
+}
+
+
+static void
+photos_single_item_job_cursor_next (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosSingleItemJob *self = PHOTOS_SINGLE_ITEM_JOB (user_data);
+  PhotosSingleItemJobPrivate *priv = self->priv;
+  GError *error;
+  gboolean valid;
+
+  error = NULL;
+  valid = tracker_sparql_cursor_next_finish (priv->cursor, res, &error);
+  if (!valid)
+    {
+      g_warning ("Unable to query single item: %s", error->message);
+      g_error_free (error);
+    }
+
+  photos_single_item_job_emit_callback (self);
+  tracker_sparql_cursor_close (priv->cursor);
+  g_clear_object (&priv->cursor);
+  g_object_unref (self);
+}
+
+
+static void
+photos_single_item_job_query_executed (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosSingleItemJob *self = PHOTOS_SINGLE_ITEM_JOB (user_data);
+  PhotosSingleItemJobPrivate *priv = self->priv;
+  TrackerSparqlConnection *connection = TRACKER_SPARQL_CONNECTION (source_object);
+  GError *error;
+
+  error = NULL;
+  priv->cursor = tracker_sparql_connection_query_finish (connection, res, &error);
+  if (error != NULL)
+    {
+      g_warning ("Unable to query single item: %s", error->message);
+      g_error_free (error);
+      photos_single_item_job_emit_callback (self);
+      return;
+    }
+
+  tracker_sparql_cursor_next_async (priv->cursor,
+                                    NULL,
+                                    photos_single_item_job_cursor_next,
+                                    g_object_ref (self));
+}
+
+
+static void
+photos_single_item_job_dispose (GObject *object)
+{
+  PhotosSingleItemJob *self = PHOTOS_SINGLE_ITEM_JOB (object);
+  PhotosSingleItemJobPrivate *priv = self->priv;
+
+  g_clear_object (&priv->cursor);
+  g_clear_object (&priv->queue);
+
+  G_OBJECT_CLASS (photos_single_item_job_parent_class)->dispose (object);
+}
+
+
+static void
+photos_single_item_job_finalize (GObject *object)
+{
+  PhotosSingleItemJob *self = PHOTOS_SINGLE_ITEM_JOB (object);
+
+  g_free (self->priv->urn);
+
+  G_OBJECT_CLASS (photos_single_item_job_parent_class)->finalize (object);
+}
+
+
+static void
+photos_single_item_job_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  PhotosSingleItemJob *self = PHOTOS_SINGLE_ITEM_JOB (object);
+
+  switch (prop_id)
+    {
+    case PROP_URN:
+      self->priv->urn = g_value_dup_string (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+
+static void
+photos_single_item_job_init (PhotosSingleItemJob *self)
+{
+  PhotosSingleItemJobPrivate *priv = self->priv;
+
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, PHOTOS_TYPE_SINGLE_ITEM_JOB, PhotosSingleItemJobPrivate);
+  priv = self->priv;
+
+  priv->queue = photos_tracker_queue_new ();
+}
+
+
+static void
+photos_single_item_job_class_init (PhotosSingleItemJobClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->dispose = photos_single_item_job_dispose;
+  object_class->finalize = photos_single_item_job_finalize;
+  object_class->set_property = photos_single_item_job_set_property;
+
+  g_object_class_install_property (object_class,
+                                   PROP_URN,
+                                   g_param_spec_string ("urn",
+                                                        "Uniform Resource Name",
+                                                        "An unique ID associated with this item",
+                                                        NULL,
+                                                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
+
+  g_type_class_add_private (class, sizeof (PhotosSingleItemJobPrivate));
+}
+
+
+PhotosSingleItemJob *
+photos_single_item_job_new (const gchar *urn)
+{
+  return g_object_new (PHOTOS_TYPE_SINGLE_ITEM_JOB, "urn", urn, NULL);
+}
+
+
+void
+photos_single_item_job_run (PhotosSingleItemJob *self,
+                            gint flags,
+                            PhotosSingleItemJobCallback callback,
+                            gpointer user_data)
+{
+  PhotosSingleItemJobPrivate *priv = self->priv;
+  PhotosQuery *query;
+
+  priv->callback = callback;
+  priv->user_data = user_data;
+
+  query = photos_query_builder_single_query (flags, priv->urn);
+  photos_tracker_queue_select (priv->queue,
+                               query->sparql,
+                               NULL,
+                               photos_single_item_job_query_executed,
+                               g_object_ref (self),
+                               g_object_unref);
+  photos_query_free (query);
+}
diff --git a/src/photos-single-item-job.h b/src/photos-single-item-job.h
new file mode 100644
index 0000000..e59627f
--- /dev/null
+++ b/src/photos-single-item-job.h
@@ -0,0 +1,79 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 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_SINGLE_ITEM_JOB_H
+#define PHOTOS_SINGLE_ITEM_JOB_H
+
+#include <gio/gio.h>
+#include <tracker-sparql.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_SINGLE_ITEM_JOB (photos_single_item_job_get_type ())
+
+#define PHOTOS_SINGLE_ITEM_JOB(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_SINGLE_ITEM_JOB, PhotosSingleItemJob))
+
+#define PHOTOS_SINGLE_ITEM_JOB_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_SINGLE_ITEM_JOB, PhotosSingleItemJobClass))
+
+#define PHOTOS_IS_SINGLE_ITEM_JOB(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_SINGLE_ITEM_JOB))
+
+#define PHOTOS_IS_SINGLE_ITEM_JOB_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_SINGLE_ITEM_JOB))
+
+#define PHOTOS_SINGLE_ITEM_JOB_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_SINGLE_ITEM_JOB, PhotosSingleItemJobClass))
+
+typedef void (*PhotosSingleItemJobCallback) (TrackerSparqlCursor *, gpointer);
+
+typedef struct _PhotosSingleItemJob        PhotosSingleItemJob;
+typedef struct _PhotosSingleItemJobClass   PhotosSingleItemJobClass;
+typedef struct _PhotosSingleItemJobPrivate PhotosSingleItemJobPrivate;
+
+struct _PhotosSingleItemJob
+{
+  GObject parent_instance;
+  PhotosSingleItemJobPrivate *priv;
+};
+
+struct _PhotosSingleItemJobClass
+{
+  GObjectClass parent_class;
+};
+
+GType                  photos_single_item_job_get_type             (void) G_GNUC_CONST;
+
+PhotosSingleItemJob   *photos_single_item_job_new                  (const gchar *urn);
+
+void                   photos_single_item_job_run                  (PhotosSingleItemJob *self,
+                                                                    gint flags,
+                                                                    PhotosSingleItemJobCallback callback,
+                                                                    gpointer user_data);
+
+G_END_DECLS
+
+#endif /* PHOTOS_SINGLE_ITEM_JOB_H */