public function optimize(Erfurt_Sparql_Query $query)
{
$resultForm = $query->getResultForm();
$result = $query;
// TODO Not working on all queries yet.
#return $result;
if ($resultForm === 'select distinct') {
$result = $this->_optimizeDistinct($query);
}
return $result;
}
public static function getSelect(Erfurt_Sparql_Query $query, $arSqls, $strAdditional = '')
{
if (count($arSqls) == 1) {
return implode('', $arSqls[0]) . $strAdditional;
}
//union
$strUnion = 'UNION' . ($query->getResultForm() == 'select distinct' ? '' : ' ALL');
$ar = array();
foreach ($arSqls as $arSql) {
$ar[] = implode('', $arSql) . $strAdditional;
}
return '(' . implode(') ' . $strUnion . ' (', $ar) . ')';
}
/** Adds a new variable to the query and sets result form to 'DESCRIBE'. */
protected function _parseDescribe()
{
while (strtolower(current($this->_tokens)) != 'from' && strtolower(current($this->_tokens)) != 'where') {
$this->_fastForward();
if ($this->_varCheck(current($this->_tokens)) || $this->_iriCheck(current($this->_tokens))) {
require_once 'Erfurt/Sparql/QueryResultVariable.php';
$var = new Erfurt_Sparql_QueryResultVariable(current($this->_tokens));
$this->_query->addResultVar($var);
if (!$this->_query->getResultForm()) {
$this->_query->setResultForm('describe');
}
}
if (!current($this->_tokens)) {
break;
}
}
prev($this->_tokens);
}
