public function getFcConstraint($alias)
 {
     return $this->constraint_chain->getConstraint($alias)->getName();
 }
 protected function buildFieldConstraint(&$options, FcFieldConstraint $fc_constraint, ConstraintChain $constraint_chain)
 {
     $constraint = $constraint_chain->getConstraint($fc_constraint->getConstraint());
     $constraint->buildConstraint($options, $fc_constraint);
 }