/**
* Returns new payment method list instance with only those payment methods, which are available for provided
* amount.
* Returns itself, if list is already filtered and filter amount matches the given one.
*
* @param integer $amount
* @param string $currency
*
* @return WebToPay_PaymentMethodList
*
* @throws WebToPayException if this list is already filtered and not for provided amount
*/
public function filterForAmount($amount, $currency)
{
if ($currency !== $this->currency) {
throw new WebToPayException('Currencies do not match. Given currency: ' . $currency . ', currency in list: ' . $this->currency);
}
if ($this->isFiltered()) {
if ($this->amount === $amount) {
return $this;
} else {
throw new WebToPayException('This list is already filtered, use unfiltered list instead');
}
} else {
$list = new WebToPay_PaymentMethodList($this->projectId, $currency, $this->defaultLanguage, $amount);
foreach ($this->getCountries() as $country) {
$country = $country->filterForAmount($amount, $currency);
if (!$country->isEmpty()) {
$list->addCountry($country);
}
}
return $list;
}
}
