ComponentRegistrar.php

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<?php
namespace Magento\Framework\Component;

class ComponentRegistrar implements ComponentRegistrarInterface
{
    const MODULE = 'module';
    const LIBRARY = 'library';
    const THEME = 'theme';
    const LANGUAGE = 'language';
    const SETUP = 'setup';
    private static $paths = [
        self::MODULE => [],
        self::LIBRARY => [],
        self::LANGUAGE => [],
        self::THEME => [],
        self::SETUP => []
    ];

    public static function register($type, $componentName, $path)
    {
        self::validateType($type);
        if (isset(self::$paths[$type][$componentName])) {
            throw new \LogicException(
                ucfirst($type) . ' \'' . $componentName . '\' from \'' . $path . '\' '
                . 'has been already defined in \'' . self::$paths[$type][$componentName] . '\'.'
            );
        } else {
            self::$paths[$type][$componentName] = str_replace('\\', '/', $path);
        }
    }

    public function getPaths($type)
    {
        self::validateType($type);
        return self::$paths[$type];
    }

    public function getPath($type, $componentName)
    {
        self::validateType($type);
        return self::$paths[$type][$componentName] ?? null;
    }

    private static function validateType($type)
    {
        if (!isset(self::$paths[$type])) {
            throw new \LogicException('\'' . $type . '\' is not a valid component type');
        }
    }
}