/**
* {@inheritdoc}
*
* If operand is a Reference with extract it.
* It accepts only a Result instance since it is the only one result it can wrap.
*/
public function compute()
{
if ($this->operand instanceof ReferenceInterface) {
$this->operand = $this->operand->getReference();
if (!$this->operand) {
throw new \LogicException(sprintf('Operand can not be found in results set (%s).', $this->operand));
}
}
if (!$this->operand instanceof Result) {
throw new \LogicException('Wrapper can wrap only a Amount\\Result instance.');
}
$value = $this->field === self::VALUE ? $this->operand->getValue() : $this->operand->getComplement();
return $value;
}
