public function validate($value, Constraint $constraint)
{
    if (!$constraint instanceof AbstractComparison) {
        throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\AbstractComparison');
    }

    if (null === $value) {
        return;
    }

    if (!$this->compareValues($value, $constraint->value)) {
        $this->context->addViolation($constraint->message, array(
            '{{ value }}' => $this->valueToString($constraint->value),
            '{{ compared_value }}' => $this->valueToString($constraint->value),
            '{{ compared_value_type }}' => $this->valueToType($constraint->value)
        ));
    }
}