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<?php
declare(strict_types=1);
namespace Money\Currencies;
use ArrayIterator;
use Cache\TagInterop\TaggableCacheItemInterface;
use CallbackFilterIterator;
use Money\Currencies;
use Money\Currency;
use Psr\Cache\CacheItemPoolInterface;
use Traversable;
use function iterator_to_array;
/**
* Cache the result of currency checking.
*/
final class CachedCurrencies implements Currencies
{
private Currencies $currencies;
private CacheItemPoolInterface $pool;
public function __construct(Currencies $currencies, CacheItemPoolInterface $pool)
{
$this->currencies = $currencies;
$this->pool = $pool;
}
public function contains(Currency $currency): bool
{
$item = $this->pool->getItem('currency|availability|' . $currency->getCode());
if ($item->isHit() === false) {
$item->set($this->currencies->contains($currency));
if ($item instanceof TaggableCacheItemInterface) {
$item->setTags(['currency.availability']);
}
$this->pool->save($item);
}
return (bool) $item->get();
}
public function subunitFor(Currency $currency): int
{
$item = $this->pool->getItem('currency|subunit|' . $currency->getCode());
if ($item->isHit() === false) {
$item->set($this->currencies->subunitFor($currency));
if ($item instanceof TaggableCacheItemInterface) {
$item->setTags(['currency.subunit']);
}
$this->pool->save($item);
}
return (int) $item->get();
}
/** {@inheritDoc} */
public function getIterator(): Traversable
{
return new CallbackFilterIterator(
new ArrayIterator(iterator_to_array($this->currencies->getIterator())),
function (Currency $currency): bool {
$item = $this->pool->getItem('currency|availability|' . $currency->getCode());
$item->set(true);
if ($item instanceof TaggableCacheItemInterface) {
$item->setTags(['currency.availability']);
}
$this->pool->save($item);
return true;
}
);
}
}