<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Database
 *
 * @copyright   Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Joomla Database Query Limitable Interface.
 * Adds bind/unbind methods as well as a getBounded() method
 * to retrieve the stored bounded variables on demand prior to
 * query execution.
 *
 * @since  12.1
 */
interface JDatabaseQueryLimitable
{
	/**
	 * Method to modify a query already in string format with the needed
	 * additions to make the query limited to a particular number of
	 * results, or start at a particular offset. This method is used
	 * automatically by the __toString() method if it detects that the
	 * query implements the JDatabaseQueryLimitable interface.
	 *
	 * @param   string   $query   The query in string format
	 * @param   integer  $limit   The limit for the result set
	 * @param   integer  $offset  The offset for the result set
	 *
	 * @return  string
	 *
	 * @since   12.1
	 */
	public function processLimit($query, $limit, $offset = 0);

	/**
	 * Sets the offset and limit for the result set, if the database driver supports it.
	 *
	 * Usage:
	 * $query->setLimit(100, 0); (retrieve 100 rows, starting at first record)
	 * $query->setLimit(50, 50); (retrieve 50 rows, starting at 50th record)
	 *
	 * @param   integer  $limit   The limit for the result set
	 * @param   integer  $offset  The offset for the result set
	 *
	 * @return  JDatabaseQuery  Returns this object to allow chaining.
	 *
	 * @since   12.1
	 */
	public function setLimit($limit = 0, $offset = 0);
}