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<?php |
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declare(strict_types = 1); |
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namespace Innmind\Reflection\ExtractionStrategy; |
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use Innmind\Reflection\{ |
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ExtractionStrategyInterface, |
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Exception\InvalidArgumentException, |
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Exception\PropertyCannotBeExtractedException |
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}; |
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use Innmind\Immutable\{ |
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StreamInterface, |
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Map |
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}; |
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final class DelegationStrategy implements ExtractionStrategyInterface |
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{ |
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private $strategies; |
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private $cache; |
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/** |
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* @param StreamInterface<ExtractionStrategyInterface> $strategies |
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*/ |
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public function __construct(StreamInterface $strategies) |
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{ |
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if ((string) $strategies->type() !== ExtractionStrategyInterface::class) { |
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throw new InvalidArgumentException; |
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} |
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$this->strategies = $strategies; |
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$this->cache = new Map('string', ExtractionStrategyInterface::class); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function supports($object, string $property): bool |
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{ |
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return $this |
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->strategies |
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->reduce( |
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false, |
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function(bool $supports, ExtractionStrategyInterface $strategy) use ($object, $property): bool { |
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if ($supports === true) { |
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return true; |
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} |
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return $strategy->supports($object, $property); |
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} |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function extract($object, string $property) |
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{ |
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$key = $this->generateKey($object, $property); |
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if ($this->cache->contains($key)) { |
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return $this |
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->cache |
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->get($key) |
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->extract($object, $property); |
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} |
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$strategy = $this->strategies->reduce( |
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null, |
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function($target, ExtractionStrategyInterface $strategy) use ($object, $property) { |
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if ($target instanceof ExtractionStrategyInterface) { |
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return $target; |
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} |
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if ($strategy->supports($object, $property)) { |
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return $strategy; |
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} |
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} |
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); |
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if (!$strategy instanceof ExtractionStrategyInterface) { |
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throw new PropertyCannotBeExtractedException($property); |
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} |
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$this->cache = $this->cache->put($key, $strategy); |
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return $strategy->extract($object, $property); |
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} |
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private function generateKey($object, string $property): string |
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{ |
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return get_class($object).'::'.$property; |
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} |
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} |
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Innmind /
Reflection
