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/* json-gobject.h - JSON GObject integration
*
* This file is part of JSON-GLib
* Copyright (C) 2007 OpenedHand Ltd.
*
* 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 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.
*
* Author:
* Emmanuele Bassi <ebassi@openedhand.com>
*/
/**
* SECTION:json-gobject
* @short_description: Serialize and deserialize GObjects
*
* JSON-GLib provides API for serializing and deserializing #GObject<!-- -->s
* to and from JSON data streams.
*
* The simplest form to serialize a #GObject class is calling the
* json_serialize_gobject() function on a #GObject instance: every
* property using a fundamental type (or a type that can be coherced
* into a fundamental type) will be converted into a JSON type.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include "json-gobject.h"
#include "json-parser.h"
#include "json-generator.h"
static JsonNode *
json_serialize_pspec (GObject *gobject,
GParamSpec *pspec)
{
JsonNode *retval = NULL;
GValue real_value = { 0, };
GValue value = { 0, };
g_value_init (&real_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (gobject, pspec->name, &real_value);
if (!G_TYPE_FUNDAMENTAL (G_VALUE_TYPE (&real_value)))
{
g_warning ("Complex types are not supported.");
return NULL;
}
switch (G_VALUE_TYPE (&real_value))
{
case G_TYPE_INT:
case G_TYPE_BOOLEAN:
case G_TYPE_FLOAT:
/* JSON native types */
retval = json_node_new (JSON_NODE_VALUE);
g_value_init (&value, G_VALUE_TYPE (&real_value));
g_value_copy (&real_value, &value);
json_node_set_value (retval, &value);
g_value_unset (&value);
break;
case G_TYPE_STRING:
/* strings might be NULL */
if (!g_value_get_string (&real_value))
retval = json_node_new (JSON_NODE_NULL);
else
{
retval = json_node_new (JSON_NODE_VALUE);
g_value_init (&value, G_TYPE_STRING);
g_value_set_string (&value, g_value_get_string (&real_value));
json_node_set_value (retval, &value);
g_value_unset (&value);
}
break;
case G_TYPE_UINT:
case G_TYPE_LONG:
case G_TYPE_ULONG:
case G_TYPE_CHAR:
case G_TYPE_UCHAR:
case G_TYPE_ENUM:
case G_TYPE_FLAGS:
/* these should fit into an int */
retval = json_node_new (JSON_NODE_VALUE);
g_value_init (&value, G_TYPE_INT);
g_value_copy (&real_value, &value);
json_node_set_value (retval, &value);
g_value_unset (&value);
break;
case G_TYPE_NONE:
retval = json_node_new (JSON_NODE_NULL);
break;
default:
g_warning ("Unsupported type `%s'",
g_type_name (G_VALUE_TYPE (&real_value)));
break;
}
g_value_unset (&real_value);
return retval;
}
/**
* json_serialize_gobject:
* @gobject: a #GObject
* @length: return value for the length of the buffer, or %NULL
*
* Serializes a #GObject into a JSON data stream.
*
* Return value: a JSON data stream representing the passed #GObject
*/
gchar *
json_serialize_gobject (GObject *gobject,
gsize *length)
{
JsonGenerator *gen;
JsonNode *root;
JsonObject *object;
GParamSpec **pspecs;
guint n_pspecs, i;
gchar *data;
g_return_val_if_fail (G_IS_OBJECT (gobject), NULL);
object = json_object_new ();
root = json_node_new (JSON_NODE_OBJECT);
json_node_take_object (root, object);
pspecs = g_object_class_list_properties (G_OBJECT_GET_CLASS (gobject),
&n_pspecs);
for (i = 0; i < n_pspecs; i++)
{
GParamSpec *pspec = pspecs[i];
JsonNode *value;
/* read only what we can */
if (!(pspec->flags & G_PARAM_READABLE))
continue;
value = json_serialize_pspec (gobject, pspec);
if (value)
json_object_add_member (object, pspec->name, value);
}
g_free (pspecs);
gen = json_generator_new ();
json_generator_set_root (gen, root);
g_object_set (gen, "pretty", TRUE, NULL);
data = json_generator_to_data (gen, length);
g_object_unref (gen);
return data;
}
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