/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "sql-update.h"

/**
 * SECTION: sql-update
 * @Short_description: an SQL UPDATE statement 
 * @Title: SqlUpdate
 * 
 * Represents an SQL UPDATE statement.
 **/
G_DEFINE_TYPE (SqlUpdate, sql_update, SQL_TYPE_DML);

SqlUpdate * sql_update_new ()
{
	return g_object_new (SQL_TYPE_UPDATE, NULL);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void sql_update_render_set (SqlUpdateSet * set, SqlRender * render)
{
	sql_render_add_object (render, set->field);
	sql_render_add_token (render, "=");
	sql_render_add_object (render, set->expr);
}

static void sql_update_render (SqlUpdate * obj, SqlRender * render)
{
	sql_render_add_list (render, T, "UPDATE", SQL_DML (obj)->target, ",");

	if (SQL_DML (obj)->target)
	{
		sql_render_add_list_with_func (render, T, "SET", obj->set, ",",
			(SqlRenderFunc) sql_update_render_set);
		sql_render_add_item (render, F, "WHERE", SQL_DML (obj)->where);
	}
}

static void sql_update_set_free (SqlUpdateSet * obj)
{
	g_object_unref (obj->field);
	g_object_unref (obj->expr);
	g_free (obj);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Public

void sql_update_add_set (SqlUpdate * obj, SqlField * field, SqlExpr * expr)
{
	g_return_if_fail (SQL_IS_UPDATE (obj));
	g_return_if_fail (SQL_IS_FIELD (field) && SQL_IS_EXPR (expr));
	
	SqlUpdateSet * set = g_new (SqlUpdateSet, 1);
	set->field = g_object_ref_sink (field);
	set->expr = g_object_ref_sink (expr);
	obj->set = g_slist_append (obj->set, set);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void sql_update_init (SqlUpdate * obj)
{	
	obj->set = NULL;
}

static void sql_update_finalize (SqlUpdate * obj)
{
	g_slist_free_full (obj->set, (GFreeFunc) sql_update_set_free);
	G_OBJECT_CLASS (sql_update_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_update_class_init (SqlUpdateClass * klass)
{
	G_OBJECT_CLASS (klass)->finalize = (GObjectFinalizeFunc) sql_update_finalize;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_update_render;
}