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<?php
namespace Money;
/**
* Currency Pair holding a base, a counter currency and a conversion ratio.
*
* @author Mathias Verraes
*
* @see http://en.wikipedia.org/wiki/Currency_pair
*/
final class CurrencyPair implements \JsonSerializable
{
/**
* Currency to convert from.
*
* @var Currency
*/
private $baseCurrency;
/**
* Currency to convert to.
*
* @var Currency
*/
private $counterCurrency;
/**
* @var float
*/
private $conversionRatio;
/**
* @param Currency $baseCurrency
* @param Currency $counterCurrency
* @param float $conversionRatio
*
* @throws \InvalidArgumentException If conversion ratio is not numeric
*/
public function __construct(Currency $baseCurrency, Currency $counterCurrency, $conversionRatio)
{
if (!is_numeric($conversionRatio)) {
throw new \InvalidArgumentException('Conversion ratio must be numeric');
}
$this->counterCurrency = $counterCurrency;
$this->baseCurrency = $baseCurrency;
$this->conversionRatio = (float) $conversionRatio;
}
/**
* Creates a new Currency Pair based on "EUR/USD 1.2500" form representation.
*
* @param string $iso String representation of the form "EUR/USD 1.2500"
*
* @return CurrencyPair
*
* @throws \InvalidArgumentException Format of $iso is invalid
*/
public static function createFromIso($iso)
{
$currency = '([A-Z]{2,3})';
$ratio = "([0-9]*\.?[0-9]+)"; // @see http://www.regular-expressions.info/floatingpoint.html
$pattern = '#'.$currency.'/'.$currency.' '.$ratio.'#';
$matches = [];
if (!preg_match($pattern, $iso, $matches)) {
throw new \InvalidArgumentException(
sprintf(
'Cannot create currency pair from ISO string "%s", format of string is invalid',
$iso
)
);
}
return new self(new Currency($matches[1]), new Currency($matches[2]), $matches[3]);
}
/**
* Returns the counter currency.
*
* @return Currency
*/
public function getCounterCurrency()
{
return $this->counterCurrency;
}
/**
* Returns the base currency.
*
* @return Currency
*/
public function getBaseCurrency()
{
return $this->baseCurrency;
}
/**
* Returns the conversion ratio.
*
* @return float
*/
public function getConversionRatio()
{
return $this->conversionRatio;
}
/**
* Checks if an other CurrencyPair has the same parameters as this.
*
* @param CurrencyPair $other
*
* @return bool
*/
public function equals(CurrencyPair $other)
{
return
$this->baseCurrency->equals($other->baseCurrency)
&& $this->counterCurrency->equals($other->counterCurrency)
&& $this->conversionRatio === $other->conversionRatio
;
}
/**
* {@inheritdoc}
*
* @return array
*/
public function jsonSerialize()
{
return [
'baseCurrency' => $this->baseCurrency,
'counterCurrency' => $this->counterCurrency,
'ratio' => $this->conversionRatio,
];
}
}