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<?php |
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/** |
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* File was created 22.06.2016 06:01 |
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*/ |
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namespace PeekAndPoke\Component\Slumber\Data; |
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use PeekAndPoke\Types\ValueHolder; |
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/** |
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* @author Karsten J. Gerber <[email protected]> |
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*/ |
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class LazyDbReference implements ValueHolder |
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{ |
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/** @var Repository */ |
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private $repository; |
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/** @var mixed */ |
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private $referencedId; |
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/** @var mixed */ |
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private $referenced; |
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/** @var bool */ |
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private $alreadyTriedToLoad = false; |
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/** |
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* @param Repository $repository |
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* @param mixed $referencedId |
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* |
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* @return static |
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*/ |
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public static function create(Repository $repository, $referencedId) |
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{ |
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$result = new static(null); |
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$result->repository = $repository; |
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$result->referencedId = $referencedId; |
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return $result; |
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} |
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/** |
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* @param mixed $subject |
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* |
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* @return mixed |
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*/ |
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public static function unwrap($subject) |
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{ |
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if ($subject instanceof self) { |
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return $subject->getValue(); |
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} |
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return $subject; |
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} |
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/** |
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* LazyDbReference constructor. |
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* |
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* @param mixed $referenced |
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*/ |
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public function __construct($referenced) |
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{ |
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$this->referenced = $referenced; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getReferencedId() |
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{ |
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return $this->referencedId; |
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} |
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/** |
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* @return mixed |
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*/ |
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public function getValue() |
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{ |
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if ($this->referenced !== null) { |
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return $this->referenced; |
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} |
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// are we set up and did not try to load yet? |
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if ($this->alreadyTriedToLoad === false) { |
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// remember that we already tried to load |
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$this->alreadyTriedToLoad = true; |
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$this->referenced = $this->repository->findById($this->referencedId); |
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} |
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return $this->referenced; |
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} |
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/** |
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* @param string $name |
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* @param array $arguments |
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* |
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* @throws \RuntimeException always |
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*/ |
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public function __call($name, $arguments) |
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{ |
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$value = $this->getValue(); |
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if ($value === null) { |
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throw new \RuntimeException( |
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"The referenced object was not found in repo '{$this->repository->getName()}'::'{$this->referencedId}'" |
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); |
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} |
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$type = \is_object($value) ? \get_class($value) : \gettype($value); |
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throw new \RuntimeException( |
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'Tried to access a DbReference without previously unwrapping it. Call $...->getValue() first. ' . |
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"The wrapped object is of type '$type' and you called the method $name()" |
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); |
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} |
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} |
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PeekAndPoke /
slumber-data
