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<?php |
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/* |
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* This file is part of the FOSElasticaBundle package. |
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* |
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* (c) FriendsOfSymfony <http://friendsofsymfony.github.com/> |
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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 FOS\ElasticaBundle\Provider; |
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use Symfony\Component\ExpressionLanguage\Expression; |
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use Symfony\Component\ExpressionLanguage\ExpressionLanguage; |
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use Symfony\Component\ExpressionLanguage\SyntaxError; |
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class Indexable implements IndexableInterface |
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{ |
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/** |
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* An array of raw configured callbacks for all types. |
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* |
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* @var array |
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*/ |
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private $callbacks = []; |
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/** |
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* An instance of ExpressionLanguage. |
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* |
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* @var ExpressionLanguage |
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*/ |
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private $expressionLanguage; |
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/** |
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* An array of initialised callbacks. |
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* |
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* @var array |
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*/ |
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private $initialisedCallbacks = []; |
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public function __construct(array $callbacks) |
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{ |
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$this->callbacks = $callbacks; |
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} |
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/** |
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* Return whether the object is indexable with respect to the callback. |
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*/ |
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public function isObjectIndexable(string $indexName, object $object): bool |
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{ |
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if (!$callback = $this->getCallback($indexName, $object)) { |
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return true; |
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} |
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if ($callback instanceof Expression) { |
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return (bool) $this->getExpressionLanguage()->evaluate($callback, [ |
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'object' => $object, |
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$this->getExpressionVar($object) => $object, |
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]); |
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} |
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return is_string($callback) |
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? call_user_func([$object, $callback]) |
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: call_user_func($callback, $object); |
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} |
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/** |
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* Builds and initialises a callback. |
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* |
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* @return callable|string|ExpressionLanguage|null |
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*/ |
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private function buildCallback(string $index, object $object) |
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{ |
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if (!array_key_exists($index, $this->callbacks)) { |
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return null; |
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} |
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$callback = $this->callbacks[$index]; |
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if (is_callable($callback) or is_callable([$object, $callback])) { |
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return $callback; |
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} |
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if (is_string($callback)) { |
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return $this->buildExpressionCallback($index, $object, $callback); |
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} |
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throw new \InvalidArgumentException(sprintf('Callback for index "%s" is not a valid callback.', $index)); |
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} |
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/** |
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* Processes a string expression into an Expression. |
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*/ |
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private function buildExpressionCallback(string $index, object $object, string $callback): Expression |
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{ |
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$expression = $this->getExpressionLanguage(); |
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if (!$expression) { |
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throw new \RuntimeException('Unable to process an expression without the ExpressionLanguage component.'); |
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} |
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try { |
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$callback = new Expression($callback); |
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$expression->compile($callback, [ |
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'object', $this->getExpressionVar($object), |
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]); |
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return $callback; |
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} catch (SyntaxError $e) { |
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throw new \InvalidArgumentException(sprintf('Callback for index "%s" is an invalid expression', $index), $e->getCode(), $e); |
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} |
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} |
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/** |
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* Retreives a cached callback, or creates a new callback if one is not found. |
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* |
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* @return mixed |
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*/ |
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private function getCallback(string $index, object $object) |
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{ |
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if (!array_key_exists($index, $this->initialisedCallbacks)) { |
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$this->initialisedCallbacks[$index] = $this->buildCallback($index, $object); |
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} |
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return $this->initialisedCallbacks[$index]; |
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} |
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/** |
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* Returns the ExpressionLanguage class if it is available. |
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*/ |
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private function getExpressionLanguage(): ?ExpressionLanguage |
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{ |
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if (null === $this->expressionLanguage) { |
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$this->expressionLanguage = new ExpressionLanguage(); |
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} |
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return $this->expressionLanguage; |
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} |
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/** |
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* Returns the variable name to be used to access the object when using the ExpressionLanguage |
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* component to parse and evaluate an expression. |
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* |
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* @param mixed $object |
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*/ |
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private function getExpressionVar($object = null): string |
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{ |
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if (!is_object($object)) { |
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return 'object'; |
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} |
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$ref = new \ReflectionClass($object); |
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return strtolower($ref->getShortName()); |
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} |
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} |
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FriendsOfSymfony /
FOSElasticaBundle
