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<?php |
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/* |
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* This file is part of the unicorn project |
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* |
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* (c) Philipp Braeutigam <[email protected]>, Steffen Brand <[email protected]> and contributors |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Xynnn\Unicorn\Converter; |
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use Xynnn\Unicorn\ConverterInterface; |
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use Xynnn\Unicorn\Exception\UnsupportedUnitException; |
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use Xynnn\Unicorn\Model\ConvertibleValue; |
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use Xynnn\Unicorn\Model\Unit; |
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abstract class AbstractConverter implements ConverterInterface |
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{ |
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const MAX_DECIMALS = 999; |
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/** |
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* @var Unit[] List of convertible units |
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*/ |
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protected $units = []; |
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/** |
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* @return string |
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*/ |
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abstract public function getName(): string; |
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/** |
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* @param ConvertibleValue $from |
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* @param Unit $to |
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* @return ConvertibleValue |
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*/ |
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public function convert(ConvertibleValue $from, Unit $to): ConvertibleValue |
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{ |
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if (!$from instanceof ConvertibleValue || !is_string($from->getValue()) || !$from->getUnit() instanceof Unit) { |
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throw new \InvalidArgumentException('The given ConvertibleValue is not valid for conversion.'); |
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} |
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$this->validate([$from->getUnit(), $to]); |
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$this->normalize($from); |
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$this->convertTo($from, $to); |
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return $from; |
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} |
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/** |
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* @param array $units |
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*/ |
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protected function validate(array $units) |
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{ |
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foreach ($units as $unit) { |
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// make sure the unit is equal to an instance in the converters units array |
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if (!in_array($unit, $this->units)) { |
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throw new UnsupportedUnitException($unit); |
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} |
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} |
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} |
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/** |
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* @param ConvertibleValue $cv |
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*/ |
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protected function normalize(ConvertibleValue $cv) |
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{ |
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$cv->setValue(bcdiv($cv->getValue(), $cv->getUnit()->getFactor(), self::MAX_DECIMALS)); |
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$cv->setUnit($this->getBaseUnit()); |
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} |
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/** |
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* @param ConvertibleValue $from The convertible to be converted |
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* @param Unit $to Unit to which is to be converted |
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*/ |
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protected function convertTo(ConvertibleValue $from, Unit $to) |
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{ |
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$from->setValue(bcmul($from->getValue(), $to->getFactor(), self::MAX_DECIMALS)); |
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$from->setUnit($to); |
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} |
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/** |
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* @return array |
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*/ |
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public function getUnits(): array |
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{ |
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return $this->units; |
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} |
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} |
xyNNN /
unicorn
