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<?php |
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namespace CL\CurrencyConvert; |
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use SebastianBergmann\Money\Currency; |
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use CL\PsrCache\CacheItemPoolInterface; |
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use SimpleXMLElement; |
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use Exception; |
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use InvalidArgumentException; |
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/** |
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* @author Ivan Kerin <[email protected]> |
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* @copyright 2014, Clippings Ltd. |
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* @license http://spdx.org/licenses/BSD-3-Clause |
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*/ |
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class ECBSource implements SourceInterface |
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{ |
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/** |
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* @var array |
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*/ |
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private $rates; |
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/** |
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* @var CachedRemoteData |
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*/ |
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private $cachedRemoteData; |
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/** |
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* @param CacheItemPoolInterface $cachePool |
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* @param string $key |
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*/ |
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public function __construct(CacheItemPoolInterface $cachePool, $key = 'ECBSource') |
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{ |
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$this->cachedRemoteData = new CachedRemoteData( |
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$cachePool, |
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'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml', |
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$key |
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); |
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} |
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/** |
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* @return CachedRemoteData |
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*/ |
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public function getCachedRemoteData() |
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{ |
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return $this->cachedRemoteData; |
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} |
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/** |
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* @return string |
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* @throws Exception If error retrieving remote data |
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*/ |
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public function getData() |
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{ |
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return $this->cachedRemoteData->get(); |
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} |
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/** |
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* @return array |
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* @throws Exception If error retrieving remote data |
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*/ |
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public function getRates() |
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{ |
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if (! $this->rates) { |
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$xml = new SimpleXMLElement($this->getData()); |
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$rates = json_decode(json_encode($xml)); |
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$this->rates = array('EUR' => '1'); |
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if (! isset($rates->Cube->Cube->Cube)) { |
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throw new Exception('Invalid data returned from source. Must have "Cube" tag'); |
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} |
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foreach ($rates->Cube->Cube->Cube as $rate) { |
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$this->rates[$rate->{'@attributes'}->currency] = $rate->{'@attributes'}->rate; |
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} |
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} |
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return $this->rates; |
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} |
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/** |
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* @param Currency $currency |
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* @return float |
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* @throws Exception If error retrieving remote data |
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*/ |
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public function getRate(Currency $currency) |
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{ |
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$rates = $this->getRates(); |
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$code = $currency->getCurrencyCode(); |
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if (empty($rates[$code])) { |
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throw new InvalidArgumentException( |
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sprintf('%s (%s) is not supported by this source', $currency->getDisplayName(), $code) |
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); |
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} |
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return (float) $rates[$code]; |
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} |
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/** |
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* @param Currency $from |
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* @param Currency $to |
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* @return float |
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*/ |
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public function getRateBetween(Currency $from, Currency $to) |
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{ |
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$from = $this->getRate($from); |
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$to = $this->getRate($to); |
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return $from / $to; |
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} |
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} |
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clippings /
currency-convert
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.