[gnome-photos/wip/foo: 13/20] Add PhotosFetchCollectionsJob

[Debarshi Ray <debarshir src gnome org>]

commit 83daf8f0bc9f412acd071c48bf8cd2abfd347940
Author: Debarshi Ray <debarshir gnome org>
Date:   Sat Mar 30 17:48:37 2013 +0100

    Add PhotosFetchCollectionsJob

 src/Makefile.am                    |    2 +
 src/photos-fetch-collections-job.c |  235 ++++++++++++++++++++++++++++++++++++
 src/photos-fetch-collections-job.h |   81 ++++++++++++
 3 files changed, 318 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index e40942d..43391c6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -68,6 +68,8 @@ gnome_photos_SOURCES = \
        photos-empty-results-box.h \
        photos-error-box.c \
        photos-error-box.h \
+       photos-fetch-collections-job.c \
+       photos-fetch-collections-job.h \
        photos-filterable.c \
        photos-filterable.h \
        photos-header-bar.c \
diff --git a/src/photos-fetch-collections-job.c b/src/photos-fetch-collections-job.c
new file mode 100644
index 0000000..228a117
--- /dev/null
+++ b/src/photos-fetch-collections-job.c
@@ -0,0 +1,235 @@
+/*
+ * 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.
+ */
+
+/* Based on code from:
+ *   + Documents
+ */
+
+
+#include "config.h"
+
+#include <glib.h>
+#include <tracker-sparql.h>
+
+#include "photos-fetch-collections-job.h"
+#include "photos-query.h"
+#include "photos-query-builder.h"
+#include "photos-tracker-queue.h"
+
+
+struct _PhotosFetchCollectionsJobPrivate
+{
+  GList *collections;
+  PhotosFetchCollectionsJobCallback callback;
+  PhotosTrackerQueue *queue;
+  gchar *urn;
+  gpointer user_data;
+};
+
+enum
+{
+  PROP_0,
+  PROP_URN
+};
+
+
+G_DEFINE_TYPE (PhotosFetchCollectionsJob, photos_fetch_collections_job, G_TYPE_OBJECT);
+
+
+static void
+photos_fetch_collections_job_emit_callback (PhotosFetchCollectionsJob *self)
+{
+  PhotosFetchCollectionsJobPrivate *priv = self->priv;
+
+  if (priv->callback == NULL)
+    return;
+
+  (*priv->callback) (priv->collections, priv->user_data);
+}
+
+
+static void
+photos_fetch_collections_job_cursor_next (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosFetchCollectionsJob *self = PHOTOS_FETCH_COLLECTIONS_JOB (user_data);
+  PhotosFetchCollectionsJobPrivate *priv = self->priv;
+  TrackerSparqlCursor *cursor = TRACKER_SPARQL_CURSOR (source_object);
+  GError *error;
+  gboolean valid;
+  gchar *urn;
+
+  error = NULL;
+  valid = tracker_sparql_cursor_next_finish (cursor, res, &error);
+  if (error != NULL)
+    {
+      g_warning ("Unable to fetch collections: %s", error->message);
+      g_error_free (error);
+      goto end;
+    }
+  if (!valid)
+    goto end;
+
+  urn = g_strdup (tracker_sparql_cursor_get_string (cursor, 0, NULL));
+  priv->collections = g_list_prepend (priv->collections, urn);
+
+  tracker_sparql_cursor_next_async (cursor,
+                                    NULL,
+                                    photos_fetch_collections_job_cursor_next,
+                                    self);
+  return;
+
+ end:
+  priv->collections = g_list_reverse (priv->collections);
+  photos_fetch_collections_job_emit_callback (self);
+  tracker_sparql_cursor_close (cursor);
+  g_object_unref (self);
+}
+
+
+static void
+photos_fetch_collections_job_query_executed (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosFetchCollectionsJob *self = PHOTOS_FETCH_COLLECTIONS_JOB (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_warning ("Unable to fetch collections: %s", error->message);
+      g_error_free (error);
+      photos_fetch_collections_job_emit_callback (self);
+      return;
+    }
+
+  tracker_sparql_cursor_next_async (cursor,
+                                    NULL,
+                                    photos_fetch_collections_job_cursor_next,
+                                    g_object_ref (self));
+  g_object_unref (cursor);
+}
+
+
+static void
+photos_fetch_collections_job_dispose (GObject *object)
+{
+  PhotosFetchCollectionsJob *self = PHOTOS_FETCH_COLLECTIONS_JOB (object);
+
+  g_clear_object (&self->priv->queue);
+
+  G_OBJECT_CLASS (photos_fetch_collections_job_parent_class)->dispose (object);
+}
+
+
+static void
+photos_fetch_collections_job_finalize (GObject *object)
+{
+  PhotosFetchCollectionsJob *self = PHOTOS_FETCH_COLLECTIONS_JOB (object);
+  PhotosFetchCollectionsJobPrivate *priv = self->priv;
+
+  g_list_free_full (priv->collections, g_free);
+  g_free (priv->urn);
+
+  G_OBJECT_CLASS (photos_fetch_collections_job_parent_class)->finalize (object);
+}
+
+
+static void
+photos_fetch_collections_job_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec 
*pspec)
+{
+  PhotosFetchCollectionsJob *self = PHOTOS_FETCH_COLLECTIONS_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_fetch_collections_job_init (PhotosFetchCollectionsJob *self)
+{
+  PhotosFetchCollectionsJobPrivate *priv = self->priv;
+
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
+                                            PHOTOS_TYPE_FETCH_COLLECTIONS_JOB,
+                                            PhotosFetchCollectionsJobPrivate);
+  priv = self->priv;
+
+  priv->queue = photos_tracker_queue_new ();
+}
+
+
+static void
+photos_fetch_collections_job_class_init (PhotosFetchCollectionsJobClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->dispose = photos_fetch_collections_job_dispose;
+  object_class->finalize = photos_fetch_collections_job_finalize;
+  object_class->set_property = photos_fetch_collections_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 (PhotosFetchCollectionsJobPrivate));
+}
+
+
+PhotosFetchCollectionsJob *
+photos_fetch_collections_job_new (const gchar *urn)
+{
+  return g_object_new (PHOTOS_TYPE_FETCH_COLLECTIONS_JOB, "urn", urn, NULL);
+}
+
+
+void
+photos_fetch_collections_job_run (PhotosFetchCollectionsJob *self,
+                                  PhotosFetchCollectionsJobCallback callback,
+                                  gpointer user_data)
+{
+  PhotosFetchCollectionsJobPrivate *priv = self->priv;
+  PhotosQuery *query;
+
+  priv->callback = callback;
+  priv->user_data = user_data;
+
+  query = photos_query_builder_fetch_collections_query (priv->urn);
+  photos_tracker_queue_select (priv->queue,
+                               query->sparql,
+                               NULL,
+                               photos_fetch_collections_job_query_executed,
+                               g_object_ref (self),
+                               g_object_unref);
+  photos_query_free (query);
+}
diff --git a/src/photos-fetch-collections-job.h b/src/photos-fetch-collections-job.h
new file mode 100644
index 0000000..47d9494
--- /dev/null
+++ b/src/photos-fetch-collections-job.h
@@ -0,0 +1,81 @@
+/*
+ * 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.
+ */
+
+/* Based on code from:
+ *   + Documents
+ */
+
+#ifndef PHOTOS_FETCH_COLLECTIONS_JOB_H
+#define PHOTOS_FETCH_COLLECTIONS_JOB_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_FETCH_COLLECTIONS_JOB (photos_fetch_collections_job_get_type ())
+
+#define PHOTOS_FETCH_COLLECTIONS_JOB(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_FETCH_COLLECTIONS_JOB, PhotosFetchCollectionsJob))
+
+#define PHOTOS_FETCH_COLLECTIONS_JOB_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_FETCH_COLLECTIONS_JOB, PhotosFetchCollectionsJobClass))
+
+#define PHOTOS_IS_FETCH_COLLECTIONS_JOB(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_FETCH_COLLECTIONS_JOB))
+
+#define PHOTOS_IS_FETCH_COLLECTIONS_JOB_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_FETCH_COLLECTIONS_JOB))
+
+#define PHOTOS_FETCH_COLLECTIONS_JOB_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_FETCH_COLLECTIONS_JOB, PhotosFetchCollectionsJobClass))
+
+typedef void (*PhotosFetchCollectionsJobCallback) (GList *, gpointer);
+
+typedef struct _PhotosFetchCollectionsJob        PhotosFetchCollectionsJob;
+typedef struct _PhotosFetchCollectionsJobClass   PhotosFetchCollectionsJobClass;
+typedef struct _PhotosFetchCollectionsJobPrivate PhotosFetchCollectionsJobPrivate;
+
+struct _PhotosFetchCollectionsJob
+{
+  GObject parent_instance;
+  PhotosFetchCollectionsJobPrivate *priv;
+};
+
+struct _PhotosFetchCollectionsJobClass
+{
+  GObjectClass parent_class;
+};
+
+GType                      photos_fetch_collections_job_get_type    (void) G_GNUC_CONST;
+
+PhotosFetchCollectionsJob *photos_fetch_collections_job_new         (const gchar *urn);
+
+void                       photos_fetch_collections_job_run         (PhotosFetchCollectionsJob *self,
+                                                                     PhotosFetchCollectionsJobCallback 
callback,
+                                                                     gpointer user_data);
+
+G_END_DECLS
+
+#endif /* PHOTOS_FETCH_COLLECTIONS_JOB_H */