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<?php |
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/** |
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* this file is part of magerun |
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* |
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* @author Tom Klingenberg <https://github.com/ktomk> |
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*/ |
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namespace N98\Magento\Command\Developer\Module\Rewrite; |
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use BadMethodCallException; |
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use Exception; |
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use N98\Util\AutoloadHandler; |
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use stdClass; |
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/** |
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* More robust (against fatal errors in the inheritance chain) class_exists checker |
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* |
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* @package N98\Magento\Command\Developer\Module\Rewrite |
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*/ |
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final class ClassExistsChecker |
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{ |
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/** |
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* @var string |
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*/ |
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private $className; |
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/** |
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* @var stdClass |
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*/ |
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private $context; |
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/** |
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* @param string $className |
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* |
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* @return ClassExistsChecker |
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*/ |
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public static function create($className) |
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{ |
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return new self($className); |
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} |
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/** |
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* ClassExistsChecker constructor. |
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* |
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* @param string $className |
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*/ |
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public function __construct($className) |
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{ |
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$this->className = $className; |
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} |
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/** |
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* Check for class-existence while handling conditional definition of classes that extend from non-existent classes |
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* as it can happen with Magento Varien_Autoload that is using include to execute files for class definitions. |
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* |
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* @return bool |
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*/ |
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public function existsExtendsSafe() |
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{ |
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$context = $this->startContext(); |
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try { |
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$exists = class_exists($this->className); |
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} catch (Exception $ex) { |
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return $this->exceptionContext($context, $ex); |
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} |
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$this->endContext($context); |
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return $exists; |
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} |
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/** |
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* @return stdClass |
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*/ |
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private function startContext() |
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{ |
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$context = new stdClass(); |
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$context->lastException = null; |
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$context->stack = array(); |
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$context->terminator = AutoloadHandler::create(array($this, 'autoloadTerminator')); |
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$context->className = $this->className; |
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return $this->context = $context; |
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} |
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/** |
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* @param $context |
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* @param Exception $ex |
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* @return bool |
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*/ |
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private function exceptionContext($context, Exception $ex) |
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{ |
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/** @var $terminator AutoloadHandler */ |
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$terminator = $context->terminator; |
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$terminator->reset(); |
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if ($ex !== $context->lastException) { |
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$message = sprintf('Exception when checking for class %s existence', $context->className); |
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throw new ClassExistsThrownException($message, 0, $ex); |
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} |
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return false; |
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} |
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/** |
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* @param $context |
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*/ |
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private function endContext($context) |
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{ |
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if (isset($context->terminator)) { |
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/** @var $terminator AutoloadHandler */ |
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$terminator = $context->terminator; |
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$terminator->reset(); |
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} |
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$this->context = null; |
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} |
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/** |
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* Method is called as last auto-loader (if all others have failed), so the class does not exists (is not |
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* resolve-able) |
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* |
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* @param $notFoundClass |
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* @throws CanNotAutoloadCollaboratorClassException |
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*/ |
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public function autoloadTerminator($notFoundClass) |
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{ |
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$className = $this->className; |
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if (null === $context = $this->context) { |
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//@codeCoverageIgnoreStart |
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// sanity check, should never come here |
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throw new BadMethodCallException('No autoloading in place'); |
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// @codeCoverageIgnoreStop |
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} |
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if ($notFoundClass === $className) { |
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return; |
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} |
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$context->stack[] = array($notFoundClass, $className); |
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$context->lastException = new CanNotAutoloadCollaboratorClassException( |
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sprintf('%s for %s', $notFoundClass, $className) |
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); |
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throw $context->lastException; |
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} |
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} |
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netz98 /
n98-magerun
