* Parses XE XML query files
*
* @author Corina Udrescu (corina.udrescu@arnia.ro)
* @package classes\xml
* @version 0.1
*/
class XmlQueryParser extends XmlParser {
/**
* Create XmlQueryParser instance for Singleton
*
* @return XmlQueryParser object
*/
function &getInstance()
{
static $theInstance = NULL;
if(!isset($theInstance)){
$theInstance = new XmlQueryParser();
}
return $theInstance;
}
/**
* Parses an XML query file
*
* 1. Read xml file
* 2. Check the action
* 3. Parse and write cache file
*
* @param $query_id
* @param $xml_file
* @param $cache_file
*
* @return QueryParser object
*/
function &parse_xml_query($query_id, $xml_file, $cache_file)
{
// Read xml file
$xml_obj = $this->getXmlFileContent($xml_file);
// insert, update, delete, select action
$action = strtolower($xml_obj->query->attrs->action);
if(!$action) return;
// Write query cache file
$parser = new QueryParser($xml_obj->query);
FileHandler::writeFile($cache_file, $parser->toString());
return $parser;
}
/**
* Override for parent "parse" method
*
* @param null $query_id
* @param null $xml_file
* @param null $cache_file
*
* @return void
*/
function parse($query_id = NULL, $xml_file = NULL, $cache_file = NULL)
{
$this->parse_xml_query($query_id, $xml_file, $cache_file);
}
/**
* Returns XML file contents as an object
* or NULL in case of error
*
* @param $xml_file
* @return array|NULL
*/
function getXmlFileContent($xml_file)
{
$buff = FileHandler::readFile($xml_file);
$xml_obj = parent::parse($buff);
if(!$xml_obj) return;
unset($buff);
return $xml_obj;
}
}
?>