OrderByClause.php

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<?php

namespace Elgg\Database\Clauses;

use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\QueryBuilder;

class OrderByClause extends Clause {

    public $expr;

    public $direction;

    public function __construct($expr = null, $direction = null) {
        $this->expr = $expr;
        $this->direction = $direction;
    }

    public function prepare(QueryBuilder $qb, $table_alias = null) {
        $order_by = $this->expr;

        if ($this->isCallable($order_by)) {
            $order_by = $this->call($this->expr, $qb, $table_alias);
        }

        if ($order_by instanceof CompositeExpression || is_string($order_by)) {
            $qb->addOrderBy($order_by, $this->direction);
        }
    }
}