<?php

/**
 * ---------------------------------------------------------------------
 *
 * GLPI - Gestionnaire Libre de Parc Informatique
 *
 * http://glpi-project.org
 *
 * @copyright 2015-2026 Teclib' and contributors.
 * @copyright 2003-2014 by the INDEPNET Development Team.
 * @licence   https://www.gnu.org/licenses/gpl-3.0.html
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * 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 <https://www.gnu.org/licenses/>.
 *
 * ---------------------------------------------------------------------
 */

/**
 *  Sub query class
 **/
class QuerySubQuery extends AbstractQuery
{
    private $dbiterator;

    /**
     * Create a sub query
     *
     * @param array  $crit      Array of query criteria. Any valid DBmysqlIterator parameters are valid.
     * @param string $alias     Alias for the whole subquery
     */
    public function __construct(array $crit, $alias = null)
    {
        /** @var \DBmysql $DB */
        global $DB;

        parent::__construct($alias);
        if (empty($crit)) {
            throw new \RuntimeException('Cannot build an empty subquery');
        }

        $this->dbiterator = new DBmysqlIterator($DB);
        $this->dbiterator->buildQuery($crit);
    }

    /**
     *
     * Get SQL query
     *
     * @return string
     */
    public function getQuery()
    {
        /** @var \DBmysql $DB */
        global $DB;

        $sql = "(" . $this->dbiterator->getSql() . ")";

        if ($this->alias !== null) {
            $sql .= ' AS ' . $DB->quoteName($this->alias);
        }
        return $sql;
    }
}
