DALDeleteParser.inc

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

class DALDeleteParser extends DALQueryParser
{


    private function __construct()
    {

    }//end __construct()


    public static function parse(DomElement $xmlQuery)
    {
        $query     = array();
        $deleteTag = $xmlQuery->getElementsByTagName('delete')->item(0);

        if ($deleteTag !== NULL) {
            $query['DELETE'] = array();

            // There must be a where tag and should have been checked before.
            $whereTag = $deleteTag->getElementsByTagName('where')->item(0);

            $i      = 0;
            $length = $whereTag->childNodes->length;
            // Get the first field with table attr to retrieve the table name.
            while ($i < $length) {
                $cond = $whereTag->childNodes->item($i);
                $i++;

                if ($cond->nodeType !== XML_ELEMENT_NODE) {
                    continue;
                }

                if (DALBaker::getComparisonOperators($cond->tagName) !== '') {
                    $deleteFrom = $cond->getAttribute('table');
                    break;
                } else {
                    $whereTag = $cond;
                    $length   = $whereTag->childNodes->length;
                    $i        = 0;
                }
            }//end foreach

            $query['DELETE']['from'] = $deleteFrom;

            // Where condition.
            $whereCond       = DALWhereParser::parse($deleteTag);
            $query['DELETE'] = array_merge($query['DELETE'], $whereCond);
        }//end if

        return $query;

    }//end parse()


    public static function validate(DomElement $query)
    {
        $deleteTag = $query->getElementsByTagName('delete')->item(0);
        if ($deleteTag === NULL) {
            throw new DALParserException('Delete tag not found.');
        }

        // Must have where tag.
        $whereTag = $deleteTag->getElementsByTagName('where')->item(0);
        if ($whereTag === NULL) {
            $msg = 'Delete query must have a where tag.';
            throw new DALParserException($msg);
        } else {
            DALWhereParser::validate($whereTag);
        }

    }//end validate()


}//end class

?>