public function translate(SpecificationInterface $specification) : string
{
switch (true) {
case $specification instanceof ComparatorInterface:
if ($specification->sign() !== '==') {
throw new OnlyEqualityCanBeTranslatedException();
}
return sprintf('%s=%s', $specification->property(), $specification->value());
case $specification instanceof CompositeInterface:
if ((string) $specification->operator() === Operator::OR) {
throw new OnlyAndCompositionCanBeTranslatedException();
}
return sprintf('%s&%s', $this->translate($specification->left()), $this->translate($specification->right()));
default:
throw new SpecificationCantBeTranslatedException();
}
}
private function extract(SpecificationInterface $specification) : array
{
$data = [];
switch (true) {
case $specification instanceof ComparatorInterface:
$data[$specification->property()] = $specification->value();
break;
case $specification instanceof CompositeInterface:
if ((string) $specification->operator() === Operator::OR) {
throw new SpecificationNotUsableAsQueryException();
}
$data = array_merge($data, $this->extract($specification->left()), $this->extract($specification->right()));
break;
default:
throw new SpecificationNotUsableAsQueryException();
}
return $data;
}
