DALOrderByParser.inc

<?php
require_once 'DAL/Parsers/DALQueryParser.inc';
require_once 'XML/XML.inc';

class DALOrderByParser extends DALQueryParser
{


    private function __construct()
    {

    }//end __construct()


    public static function parse(DomElement $parent)
    {
        $query   = array();
        $orderBy = $parent->getElementsByTagName('order-by')->item(0);
        if ($orderBy !== NULL && $orderBy->parentNode === $parent) {
            $query['ORDER-BY'] = self::parseChildFields($orderBy);
            if ($orderBy->getAttribute('direction') !== '') {
                $query['ORDER-BY']['direction'] = $orderBy->getAttribute('direction');
            }
        }

        return $query;

    }//end parse()


    public static function validate(DomElement $select)
    {
        // Check the first order-by (could be in a sub query).
        $orderBy = $select->getElementsByTagName('order-by')->item(0);
        if ($orderBy !== NULL) {
            $tagNames = array(
                         'field',
                         'hook',
                         'alias',
                        );

            $tags = XML::getElementsByTagNames($tagNames, $orderBy);
            if (count($tags) === 0) {
                $msg = 'order-by tag must have at least one field or hook.';
                throw new DALParserException($msg);
            } else {
                foreach ($tags as $tag) {
                    if ($tag->tagName === 'field') {
                        self::validateField($tag);
                    } else if ($tag->tagName === 'hook') {
                        self::validateHook($tag);
                    }
                }
            }
        }//end if

    }//end validate()


}//end class

?>