[frogr] New class FrogrSerializer, for taking care of serializing data

[Mario Sanchez Prada <msanchez src gnome org>]

commit 6db68c4607d44fc8a8efc1a01191d9b60468defa
Author: Mario Sanchez Prada <msanchez2 gnome org>
Date:   Thu Nov 8 13:25:05 2012 +0100

    New class FrogrSerializer, for taking care of serializing data

 src/Makefile.am        |    2 +
 src/frogr-serializer.c |  176 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/frogr-serializer.h |   64 +++++++++++++++++
 3 files changed, 242 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index e009941..7d61d00 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -81,6 +81,8 @@ frogr_SOURCES = \
 	frogr-photoset.h \
 	frogr-picture.c \
 	frogr-picture.h \
+	frogr-serializer.c \
+	frogr-serializer.h \
 	frogr-settings-dialog.c \
 	frogr-settings-dialog.h \
 	frogr-util.c \
diff --git a/src/frogr-serializer.c b/src/frogr-serializer.c
new file mode 100644
index 0000000..f3c2678
--- /dev/null
+++ b/src/frogr-serializer.c
@@ -0,0 +1,176 @@
+/*
+ * frogr-serializer.c -- Serialization system for Frogr.
+ *
+ * Copyright (C) 2012 Mario Sanchez Prada
+ * Authors: Mario Sanchez Prada <msanchez gnome org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 3 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#include "frogr-serializer.h"
+
+#include "frogr-global-defs.h"
+
+#include <errno.h>
+#include <json-glib/json-glib.h>
+#include <string.h>
+
+#define SESSION_FILENAME "session.json"
+
+#define FROGR_SERIALIZER_GET_PRIVATE(object)                \
+  (G_TYPE_INSTANCE_GET_PRIVATE ((object),               \
+                                FROGR_TYPE_SERIALIZER,      \
+                                FrogrSerializerPrivate))
+
+
+G_DEFINE_TYPE (FrogrSerializer, frogr_serializer, G_TYPE_OBJECT)
+
+
+typedef struct _FrogrSerializerPrivate FrogrSerializerPrivate;
+struct _FrogrSerializerPrivate
+{
+  gchar *data_dir;
+};
+
+static FrogrSerializer *_instance = NULL;
+
+/* Prototypes */
+
+
+
+/* Private functions */
+
+
+
+/* Public functions */
+
+static void
+_finalize (GObject *object)
+{
+  FrogrSerializerPrivate *priv = FROGR_SERIALIZER_GET_PRIVATE (object);
+
+  g_free (priv->data_dir);
+
+  /* Call superclass */
+  G_OBJECT_CLASS (frogr_serializer_parent_class)->finalize (object);
+}
+
+static GObject*
+_constructor (GType type,
+              guint n_construct_properties,
+              GObjectConstructParam *construct_properties)
+{
+  GObject *object;
+
+  if (!_instance)
+    {
+      object =
+        G_OBJECT_CLASS (frogr_serializer_parent_class)->constructor (type,
+                                                                 n_construct_properties,
+                                                                 construct_properties);
+      _instance = FROGR_SERIALIZER (object);
+    }
+  else
+    object = G_OBJECT (_instance);
+
+  return object;
+}
+
+static void
+frogr_serializer_class_init (FrogrSerializerClass *klass)
+{
+  GObjectClass *obj_class = G_OBJECT_CLASS (klass);
+
+  g_type_class_add_private (klass, sizeof (FrogrSerializerPrivate));
+
+  obj_class->constructor = _constructor;
+  obj_class->finalize = _finalize;
+}
+
+static void
+frogr_serializer_init (FrogrSerializer *self)
+{
+  FrogrSerializerPrivate *priv = NULL;
+  gchar *data_dir = NULL;
+
+  priv = FROGR_SERIALIZER_GET_PRIVATE (self);
+
+  priv->data_dir = NULL;
+
+  /* Ensure that we have the data directory in place. */
+  data_dir = g_build_filename (g_get_user_data_dir (), APP_SHORTNAME, NULL);
+  if (g_mkdir_with_parents (data_dir, 0777) == 0)
+    priv->data_dir = g_strdup (data_dir);
+  else
+    {
+      g_warning ("Could not create serializer directory '%s' (%s)",
+                 data_dir, strerror (errno));
+    }
+
+  g_free (data_dir);
+}
+
+FrogrSerializer*
+frogr_serializer_get_instance (void)
+{
+  if (_instance)
+    return _instance;
+
+  return FROGR_SERIALIZER (g_object_new (FROGR_TYPE_SERIALIZER, NULL));
+}
+
+void
+frogr_serializer_save_current_session (FrogrSerializer *self, GSList *pictures)
+{
+  FrogrSerializerPrivate *priv = NULL;
+  JsonGenerator *json_gen = NULL;
+  JsonArray *json_array = NULL;
+  JsonNode *json_node = NULL;
+  JsonNode *array_node = NULL;
+  GSList *item = NULL;
+  gchar *session_path = NULL;
+  GError *error = NULL;
+
+  g_return_if_fail(FROGR_IS_SERIALIZER (self));
+
+  /* Generate a JsonArray with contents */
+  json_array = json_array_new ();
+  for (item = pictures; item; item = g_slist_next (item))
+    {
+      json_node = json_gobject_serialize (G_OBJECT (item->data));
+      if (json_node)
+        json_array_add_element (json_array, json_node);
+    }
+
+  /* Generate a JsonNode from the JsonArray */
+  array_node = json_node_new(JSON_NODE_ARRAY);
+  json_node_set_array (array_node, json_array);
+
+  /* Create a JsonGenerator using the JsonNode as root */
+  json_gen = json_generator_new ();
+  json_generator_set_root (json_gen, array_node);
+  json_node_free (array_node);
+
+  /* Save to disk */
+  priv = FROGR_SERIALIZER_GET_PRIVATE (self);
+  session_path = g_build_filename (priv->data_dir, SESSION_FILENAME, NULL);
+  json_generator_to_file (json_gen, session_path, &error);
+  if (error)
+    {
+      DEBUG ("Error serializing current state to %s: %s",
+             session_path, error->message);
+      g_error_free (error);
+    }
+  g_free (session_path);
+}
diff --git a/src/frogr-serializer.h b/src/frogr-serializer.h
new file mode 100644
index 0000000..5045bc3
--- /dev/null
+++ b/src/frogr-serializer.h
@@ -0,0 +1,64 @@
+/*
+ * frogr-serializer.h -- Serialization system for Frogr.
+ *
+ * Copyright (C) 2012 Mario Sanchez Prada
+ * Authors: Mario Sanchez Prada <msanchez gnome org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 3 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#ifndef _FROGR_SERIALIZER_H
+#define _FROGR_SERIALIZER_H
+
+#include "frogr-account.h"
+
+#include <config.h>
+#include <glib.h>
+#include <glib-object.h>
+#include <flicksoup/flicksoup.h>
+
+G_BEGIN_DECLS
+
+#define FROGR_TYPE_SERIALIZER            (frogr_serializer_get_type())
+#define FROGR_IS_SERIALIZER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE(obj, FROGR_TYPE_SERIALIZER))
+#define FROGR_IS_SERIALIZER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass,  FROGR_TYPE_SERIALIZER))
+#define FROGR_SERIALIZER(obj)            (G_TYPE_CHECK_INSTANCE_CAST(obj, FROGR_TYPE_SERIALIZER, FrogrSerializer))
+#define FROGR_SERIALIZER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST(klass,  FROGR_TYPE_SERIALIZER, FrogrSerializerClass))
+#define FROGR_SERIALIZER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS(obj,  FROGR_TYPE_SERIALIZER, FrogrSerializerClass))
+
+typedef struct _FrogrSerializer        FrogrSerializer;
+typedef struct _FrogrSerializerClass   FrogrSerializerClass;
+
+struct _FrogrSerializer
+{
+  GObject parent_instance;
+};
+
+
+struct _FrogrSerializerClass
+{
+  GObjectClass parent_class;
+};
+
+
+GType frogr_serializer_get_type (void) G_GNUC_CONST;
+
+FrogrSerializer* frogr_serializer_get_instance (void);
+
+void frogr_serializer_save_current_session (FrogrSerializer *self, GSList *pictures);
+
+G_END_DECLS
+
+#endif /* !_FROGR_SERIALIZER_H */
+