/*
 * 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 "db-result-set.h"

/**
 * SECTION: db-result-set
 * @Short_description: 
 * @Title: DbResultSet
 * @See_also: #DbResult
 **/
G_DEFINE_BOXED_TYPE (DbResultSet, db_result_set, db_result_set_copy, db_result_set_free);

/**
 * db_result_set_new:
 * 
 * Return value: the new #DbResultSet
 **/
DbResultSet * db_result_set_new ()
{
	DbResultSet * obj = g_new (DbResultSet, 1);
	obj->results = NULL;
	return obj;
}

/**
 * db_result_set_take_nth:
 * @obj: a #DbResultSet
 * @n: the position of the result, counting from 0
 *
 * Gets the nth result and removes it from the resultset. The user is
 * responsible for releasing the result with db_result_free().
 *
 * Return value: (transfer full): the #DbResult or %NULL if nth result doesn't exist
 **/
DbResult * db_result_set_take_nth (DbResultSet * obj, guint n)
{
	GSList * list;
	
	g_return_val_if_fail (obj, NULL);
	
	list = g_slist_nth (obj->results, n);
	
	if (list)
	{
		DbResult * result = list->data;
		obj->results = g_slist_delete_link (obj->results, list);
		return result;
	}

	return NULL;
}

/**
 * db_result_set_take_next:
 * @obj: a #DbResultSet
 *
 * Gets the next result and removes it from the resultset. The user is
 * responsible for releasing the result with db_result_free().
 *
 * Return value: (transfer full): the #DbResult or %NULL if no more results
 **/
DbResult * db_result_set_take_next (DbResultSet * obj)
{
	g_return_val_if_fail (obj, NULL);
	
	return db_result_set_take_nth (obj, 0);
}

/**
 * db_result_set_copy:
 * @obj: a #DbResultSet
 *
 * Makes a copy of a #DbResultSet.
 *
 * Return value: a newly allocated #DbResultSet, with the same contents
 **/
DbResultSet * db_result_set_copy (const DbResultSet * obj)
{
	GSList * n;
	DbResultSet * set;

	g_return_val_if_fail (obj, NULL);
	
	set = db_result_set_new ();

	for (n = obj->results; n; n = n->next)
		set->results = g_slist_append (set->results, db_result_copy (n->data));
	
	return set;
}

/**
 * db_result_set_free:
 * @obj: a #DbResultSet
 *
 * Frees a #DbResultSet.
 **/
void db_result_set_free (DbResultSet * obj)
{
	GSList * n;
	
	g_return_if_fail (obj);

	for (n = obj->results; n; n = n->next)
		db_result_free (n->data);

	g_slist_free (obj->results);
	g_free (obj);
}