DefinedClasses.php

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<?php
namespace Magento\Framework\Code\Generator;

use Magento\Framework\Autoload\AutoloaderRegistry;

class DefinedClasses
{
    public function isClassLoadable($className)
    {
        return $this->isClassLoadableFromMemory($className) || $this->isClassLoadableFromDisk($className);
    }

    public function isClassLoadableFromMemory($className)
    {
        return class_exists($className, false) || interface_exists($className, false);
    }

    public function isClassLoadableFromDisc($className)
    {
        return $this->isClassLoadableFromDisk($className);
    }

    public function isClassLoadableFromDisk($className)
    {
        try {
            return (bool)AutoloaderRegistry::getAutoloader()->findFile($className);
        } catch (\Exception $e) {
            // Couldn't get access to the autoloader so we need to allow class_exists to call autoloader chain
            return (class_exists($className) || interface_exists($className));
        }
    }
}