ClassDiscovery

17abstract class ClassDiscovery18{19    /**20     * A list of strategies to find classes.21     *22     * @var DiscoveryStrategy[]23     */24    private static $strategies = [Strategy\GeneratedDiscoveryStrategy::class, Strategy\CommonClassesStrategy::class, Strategy\CommonPsr17ClassesStrategy::class, Strategy\PuliBetaStrategy::class];25    private static $deprecatedStrategies = [Strategy\PuliBetaStrategy::class => \true];26    /**27     * Discovery cache to make the second time we use discovery faster.28     *29     * @var array30     */31    private static $cache = [];32    /**33     * Finds a class.34     *35     * @param string $type36     *37     * @return string|\Closure38     *39     * @throws DiscoveryFailedException40     */41    protected static function findOneByType($type)42    {43        // Look in the cache44        if (null !== $class = self::getFromCache($type)) {45            return $class;46        }47        static $skipStrategy;48        $skipStrategy ?? $skipStrategy = self::safeClassExists(Strategy\GeneratedDiscoveryStrategy::class) ? \false : Strategy\GeneratedDiscoveryStrategy::class;49        $exceptions = [];50        foreach (self::$strategies as $strategy) {51            if ($skipStrategy === $strategy) {52                continue;53            }54            try {55                $candidates = $strategy::getCandidates($type);56            } catch (StrategyUnavailableException $e) {57                if (!isset(self::$deprecatedStrategies[$strategy])) {58                    $exceptions[] = $e;59                }60                continue;61            }62            foreach ($candidates as $candidate) {63                if (isset($candidate['condition'])) {64                    if (!self::evaluateCondition($candidate['condition'])) {65                        continue;66                    }67                }68                // save the result for later use69                self::storeInCache($type, $candidate);70                return $candidate['class'];71            }72            $exceptions[] = new NoCandidateFoundException($strategy, $candidates);73        }74        throw DiscoveryFailedException::create($exceptions);75    }76    /**77     * Get a value from cache.78     *79     * @param string $type80     *81     * @return string|null82     */83    private static function getFromCache($type)84    {85        if (!isset(self::$cache[$type])) {86            return;87        }88        $candidate = self::$cache[$type];89        if (isset($candidate['condition'])) {90            if (!self::evaluateCondition($candidate['condition'])) {91                return;92            }93        }94        return $candidate['class'];95    }96    /**