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/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 2; tab-width: 2 -*- */
/*
* libgfbgraph - GObject library for Facebook Graph API
* Copyright (C) 2013 Álvaro Peña <alvaropg@gmail.com>
* 2020 Leesoo Ahn <yisooan@fedoraproject.org>
*
* GFBGraph 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 2.1 of the License, or (at your option) any later version.
*
* GFBGraph 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GFBGraph. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* SECTION:gfbgraph-connectable
* @title: GFBGraphConnectable
* @short_description: Connectable interface for nodes
* @include: gfbgraph/gfbgraph.h
*
* #GFBGraphConnectable interface allow the connection between nodes.
* You can see the posible (not necesary implemented) connections in
* the section "Connections" in any node object in the
* <ulink url="https://developers.facebook.com/docs/reference/api/">Facebook Graph API documentation</ulink>
**/
#include "gfbgraph-connectable.h"
#include "gfbgraph-node.h"
#include <json-glib/json-glib.h>
G_DEFINE_INTERFACE (GFBGraphConnectable, gfbgraph_connectable, GFBGRAPH_TYPE_NODE)
static void
gfbgraph_connectable_default_init (GFBGraphConnectableInterface *iface)
{
iface->connections = NULL;
iface->get_connection_post_params = NULL;
iface->parse_connected_data = NULL;
}
static GHashTable *
get_connections (GFBGraphConnectableInterface *iface)
{
/* The GHashTable contains the connections for a node.
* The key must be the g_type_name() of a GFBGRAPH_TYPE_NODE, and the value
* must be the function name to call in order to retrieve the nodes connected
* to the GFBGraphNode indicated by GFBGRAPH_TYPE_NODE.
*/
GHashTable *connections;
connections = iface->connections;
/* If no connections... Why you implement this iface? */
g_assert (g_hash_table_size (connections) > 0);
return connections;
}
/**
* gfbgraph_connectable_get_connection_post_params:
* @self: a #GFBGraphConnectable.
* @node_type: a #GType, required a #GFBGRAPH_TYPE_NODE or children.
*
* Get the params to be inserted in a request to the Facebook Graph API
* in order to append the node @self to a node of type @node_type.
*
* Returns: (transfer full): A string based #GHashTable with the params and his values or %NULL.
**/
GHashTable *
gfbgraph_connectable_get_connection_post_params (GFBGraphConnectable *self,
GType node_type)
{
GFBGraphConnectableInterface *iface;
g_return_val_if_fail (GFBGRAPH_IS_CONNECTABLE (self), NULL);
g_return_val_if_fail (g_type_is_a (node_type, GFBGRAPH_TYPE_NODE), NULL);
g_return_val_if_fail (gfbgraph_connectable_is_connectable_to (self, node_type), NULL);
iface = GFBGRAPH_CONNECTABLE_GET_IFACE (self);
g_assert (iface->get_connection_post_params != NULL);
return iface->get_connection_post_params (self, node_type);
}
/**
* gfbgraph_connectable_parse_connected_data:
* @self: a #GFBGraphConnectable.
* @payload: a const #gchar with the response string from the Facebook Graph API.
* @error: (allow-none): a #GError.
*
* Parse the response contained in @payload when a gfbgraph_node_get_connection_nodes() was
* executed.
*
* Returns: (element-type GFBGraphNode) (transfer full): a newly-allocated #GList of #GFBGraphNode created from the @payload or %NULL.
**/
GList *
gfbgraph_connectable_parse_connected_data (GFBGraphConnectable *self,
const gchar *payload,
GError **error)
{
GFBGraphConnectableInterface *iface;
g_return_val_if_fail (GFBGRAPH_IS_CONNECTABLE (self), NULL);
iface = GFBGRAPH_CONNECTABLE_GET_IFACE (self);
g_assert (iface->parse_connected_data != NULL);
return iface->parse_connected_data (self, payload, error);
}
/**
* gfbgraph_connectable_is_connectable_to:
* @self: a #GFBGraphConnectable.
* @node_type: a #GType, required a #GFBGRAPH_TYPE_NODE or children.
*
* Check if @self object, normally a #GFBGraphNode implementing the #GFBGraphConnectable interface,
* has the possibility to be connected to another node of type @node_type.
*
* Returns: %TRUE in case that the @self object can be connected to a node of type @node_type,
* %FALSE otherwise.
**/
gboolean
gfbgraph_connectable_is_connectable_to (GFBGraphConnectable *self,
GType node_type)
{
GFBGraphConnectableInterface *iface;
GHashTable *connections;
g_return_val_if_fail (GFBGRAPH_IS_CONNECTABLE (self), FALSE);
g_return_val_if_fail (g_type_is_a (node_type, GFBGRAPH_TYPE_NODE), FALSE);
iface = GFBGRAPH_CONNECTABLE_GET_IFACE (self);
connections = get_connections (iface);
return g_hash_table_contains (connections, g_type_name (node_type));
}
/**
* gfbgraph_connectable_get_connection_path:
* @self: a #GFBGraphConnectable.
* @node_type: a #GType, required a #GFBGRAPH_TYPE_NODE or children.
*
* Get the Facebook Graph API function path to retrieve the nodes connected with @node_type
* managed by the #GFBGraphConnectable object.
*
* Returns: (transfer none): a const #gchar with the function path or %NULL.
**/
const gchar *
gfbgraph_connectable_get_connection_path (GFBGraphConnectable *self,
GType node_type)
{
GFBGraphConnectableInterface *iface;
GHashTable *connections;
g_return_val_if_fail (GFBGRAPH_IS_CONNECTABLE (self), NULL);
g_return_val_if_fail (g_type_is_a (node_type, GFBGRAPH_TYPE_NODE), NULL);
g_return_val_if_fail (gfbgraph_connectable_is_connectable_to (self, node_type), NULL);
iface = GFBGRAPH_CONNECTABLE_GET_IFACE (self);
connections = get_connections (iface);
return (const gchar *) g_hash_table_lookup (connections, g_type_name (node_type));
}
/**
* gfbgraph_connectable_default_parse_connected_data:
* @self: a #GFBGraphConnectable.
* @payload: a const #gchar with the response string from the Facebook Graph API.
* @error: (allow-none): a #GError or %NULL.
*
* In most cases, #GFBGraphConnectable implementers can use this function in order to parse
* the response when a gfbgraph_node_get_connection_nodes() is executed and the
* gfbgraph_connectable_parse_connected_data() was called.
*
* Normally, Facebook Graph API returns the connections in the same way, using JSON objects,
* with a root object called "data".
*
* Returns: (element-type GFBGraphNode) (transfer full): a newly-allocated #GList of #GFBGraphNode with the same #GType as @self.
**/
GList *
gfbgraph_connectable_default_parse_connected_data (GFBGraphConnectable *self,
const gchar *payload,
GError **error)
{
GList *nodes_list = NULL;
JsonParser *jparser;
GType node_type;
node_type = G_OBJECT_TYPE (self);
jparser = json_parser_new ();
if (json_parser_load_from_data (jparser, payload, -1, error)) {
JsonNode *root_jnode;
JsonObject *main_jobject;
JsonArray *nodes_jarray;
int i = 0;
root_jnode = json_parser_get_root (jparser);
main_jobject = json_node_get_object (root_jnode);
nodes_jarray = json_object_get_array_member (main_jobject, "data");
for (i = 0; i < json_array_get_length (nodes_jarray); i++) {
JsonNode *jnode;
GFBGraphNode *node;
jnode = json_array_get_element (nodes_jarray, i);
node = GFBGRAPH_NODE (json_gobject_deserialize (node_type, jnode));
nodes_list = g_list_append (nodes_list, node);
}
}
g_clear_object (&jparser);
return nodes_list;
}
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