| public traverse ( Webmozart\Expression\Expression $expr ) : Webmozart\Expression\Expression | ||
| $expr | Webmozart\Expression\Expression | The expression to traverse. |
| return | Webmozart\Expression\Expression | The modified expression. May be `null` if the expression was removed entirely. |
public function traverse(Expression $expr)
{
// Do one full traversal per visitor. If any of the visitors removes
// the expression entirely, subsequent visitors are not invoked.
foreach ($this->visitors as $visitor) {
$expr = $this->traverseForVisitor($expr, $visitor);
if (!$expr) {
return null;
}
}
return $expr;
} /**
* @param Expression[] $expressions
* @param string $class
*
* @return \Doctrine\ORM\QueryBuilder
*
* @throws \Exception
*/
public function toQueryBuilder(array $expressions, $class)
{
$expr = $this->buildExpression($expressions);
$qb = $this->em->getRepository($class)->createQueryBuilder('a');
$traverser = new ExpressionTraverser();
$traverser->addVisitor(new QueryBuilderVisitor($qb));
$traverser->traverse($expr);
return $qb;
}
