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<?php
namespace Money\Currencies;
use Money\Currencies;
use Money\Currency;
use Money\Exception\UnknownCurrencyException;
/**
* List of supported ISO 4217 currency codes and names.
*
* @author Mathias Verraes
*/
final class ISOCurrencies implements Currencies
{
/**
* Map of known currencies indexed by code.
*
* @var array
*/
private static $currencies;
/**
* {@inheritdoc}
*/
public function contains(Currency $currency)
{
return isset($this->getCurrencies()[$currency->getCode()]);
}
/**
* {@inheritdoc}
*/
public function subunitFor(Currency $currency)
{
if (!$this->contains($currency)) {
throw new UnknownCurrencyException('Cannot find ISO currency '.$currency->getCode());
}
return $this->getCurrencies()[$currency->getCode()]['minorUnit'];
}
/**
* Returns the numeric code for a currency.
*
* @param Currency $currency
*
* @return int
*
* @throws UnknownCurrencyException If currency is not available in the current context
*/
public function numericCodeFor(Currency $currency)
{
if (!$this->contains($currency)) {
throw new UnknownCurrencyException('Cannot find ISO currency '.$currency->getCode());
}
return $this->getCurrencies()[$currency->getCode()]['numericCode'];
}
/**
* @return \Traversable
*/
public function getIterator()
{
return new \ArrayIterator(
array_map(
function ($code) {
return new Currency($code);
},
array_keys($this->getCurrencies())
)
);
}
/**
* Returns a map of known currencies indexed by code.
*
* @return array
*/
private function getCurrencies()
{
if (null === self::$currencies) {
self::$currencies = $this->loadCurrencies();
}
return self::$currencies;
}
/**
* @return array
*/
private function loadCurrencies()
{
$file = __DIR__.'/../../resources/currency.php';
if (file_exists($file)) {
return require $file;
}
throw new \RuntimeException('Failed to load currency ISO codes.');
}
}