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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2016 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\CMS\Event\Table;

\defined('JPATH_PLATFORM') or die;

use BadMethodCallException;
use Joomla\Database\DatabaseQuery;

/**
 * Event class for JTable's onBeforeMove event
 *
 * @since  4.0.0
 */
class BeforeMoveEvent extends AbstractEvent
{
	/**
	 * Constructor.
	 *
	 * Mandatory arguments:
	 * subject		JTableInterface	The table we are operating on
	 * query		DatabaseQuery	The query to get the primary keys and ordering values for the selection.
	 * delta		int				The direction and magnitude to move the row in the ordering sequence.
	 * where		string			WHERE clause to use for limiting the selection of rows to compact the ordering values.
	 *
	 * @param   string  $name       The event name.
	 * @param   array   $arguments  The event arguments.
	 *
	 * @throws  BadMethodCallException
	 */
	public function __construct($name, array $arguments = array())
	{
		if (!\array_key_exists('query', $arguments))
		{
			throw new BadMethodCallException("Argument 'query' is required for event $name");
		}

if (!\array_key_exists('delta', $arguments))
		{
			throw new BadMethodCallException("Argument 'delta' is required for event $name");
		}

if (!\array_key_exists('where', $arguments))
		{
			throw new BadMethodCallException("Argument 'where' is required for event $name");
		}

parent::__construct($name, $arguments);
	}

/**
	 * Setter for the query argument
	 *
	 * @param   DatabaseQuery  $value  The value to set
	 *
	 * @return  mixed
	 *
	 * @throws  BadMethodCallException  if the argument is not of the expected type
	 */
	protected function setQuery($value)
	{
		if (!($value instanceof DatabaseQuery))
		{
			throw new BadMethodCallException("Argument 'query' of event {$this->name} must be of DatabaseQuery type");
		}

return $value;
	}

/**
	 * Setter for the delta argument
	 *
	 * @param   int  $value  The value to set
	 *
	 * @return  integer
	 *
	 * @throws  BadMethodCallException  if the argument is not of the expected type
	 */
	protected function setDelta($value)
	{
		if (!is_numeric($value))
		{
			throw new BadMethodCallException("Argument 'delta' of event {$this->name} must be an integer");
		}

return (int) $value;
	}

/**
	 * Setter for the where argument
	 *
	 * @param   string|null  $value  The value to set
	 *
	 * @return  mixed
	 *
	 * @throws  BadMethodCallException  if the argument is not of the expected type
	 */
	protected function setWhere($value)
	{
		if (!empty($value) && !\is_string($value))
		{
			throw new BadMethodCallException("Argument 'where' of event {$this->name} must be empty or string");
		}

return $value;
	}
}