<?php

/**

* Copyright 2017 Open Infrastructure Foundation

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

**/

final class OrderElement

{

/**

* @var string

*/

private $field;

/**

* @var string

*/

private $direction;

/**

* OrderElement constructor.

* @param $field

* @param $direction

*/

private function __construct($field, $direction)

{

$this->field = $field;

$this->direction = $direction;

}

public static function buildAscFor($field)

{

return new OrderElement($field, 'ASC');

}

public static function buildDescFor($field)

{

return new OrderElement($field, 'DESC');

}

/**

* @return string

*/

public function getField()

{

return $this->field;

}

public function isAsc()

{

return $this->direction === 'ASC';

}

/**

* @return string

*/

public function getDirection()

{

return $this->direction;

}

}