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<?php |
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namespace Lneicelis\Transformer; |
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use Lneicelis\Transformer\Contract\CanLoad; |
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use Lneicelis\Transformer\Exception\TransformerNotFoundException; |
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use Lneicelis\Transformer\Helper\Arr; |
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use Lneicelis\Transformer\ValueObject\Context; |
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use Lneicelis\Transformer\ValueObject\Deferred; |
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use Lneicelis\Transformer\ValueObject\Path; |
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class DeferredAwareTransformer extends Transformer |
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{ |
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/** @var array[] */ |
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private $deferredTree = []; |
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/** @var CanLoad */ |
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private $loaderByResourceClass; |
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public function addLoader(CanLoad $loader): void |
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{ |
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$this->loaderByResourceClass[$loader->getResourceName()] = $loader; |
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} |
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/** |
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* @param mixed $resource |
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* @param Context|null $context |
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* @return string|int|float|array |
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* @throws TransformerNotFoundException |
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*/ |
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public function transform($resource, Context $context = null) |
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{ |
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$context = $context ?: new Context(); |
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$result = parent::transform($resource, $context); |
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if (! empty($this->deferredTree)) { |
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$result = $this->loadDeferred($result); |
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return $this->transform($result, $context); |
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} |
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return $result; |
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} |
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/** |
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* @param $resource |
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* @param Context $context |
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* @param Path $path |
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* @return array|float|int|string |
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* @throws TransformerNotFoundException |
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* @throws Exception\TransformerNotFoundException |
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*/ |
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protected function transformAny($resource, Context $context, Path $path) |
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{ |
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if (! $resource instanceof Deferred) { |
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return parent::transformAny($resource, $context, $path); |
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} |
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$resourceClass = $resource->getResourceClass(); |
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$resourceId = $resource->getId(); |
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$this->deferredTree[$resourceClass][$resourceId] = $path; |
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return null; |
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} |
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/** |
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* @param array $result |
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* @return array |
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*/ |
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protected function loadDeferred(array $result): array |
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{ |
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foreach ($this->deferredTree as $resourceClass => $pathByResourceId) { |
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$loader = $this->getLoader($resourceClass); |
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$ids = array_keys($pathByResourceId); |
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$loadedValues = $loader->load($ids); |
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foreach (array_values($pathByResourceId) as $index => $path) { |
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/** @var Path $path */ |
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$result = Arr::setValue( |
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$result, |
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$path->getSegments(), |
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$loadedValues[$index] |
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); |
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} |
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unset($this->deferredTree[$resourceClass]); |
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} |
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return $result; |
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} |
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protected function getLoader(string $resourceClass): CanLoad |
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{ |
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return $this->loaderByResourceClass[$resourceClass]; |
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} |
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} |
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lneicelis /
transformer
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