Filesystem.php

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<?php
namespace Magento\Framework;

use Magento\Framework\Filesystem\DriverPool;

class Filesystem
{
    protected $directoryList;

    protected $readFactory;

    protected $writeFactory;

    protected $readInstances = [];

    protected $writeInstances = [];

    public function __construct(
        \Magento\Framework\Filesystem\DirectoryList $directoryList,
        \Magento\Framework\Filesystem\Directory\ReadFactory $readFactory,
        \Magento\Framework\Filesystem\Directory\WriteFactory $writeFactory
    ) {
        $this->directoryList = $directoryList;
        $this->readFactory = $readFactory;
        $this->writeFactory = $writeFactory;
    }

    public function getDirectoryRead($directoryCode, $driverCode = DriverPool::FILE)
    {
        $code = $directoryCode . '_' . $driverCode;
        if (!array_key_exists($code, $this->readInstances)) {
            $this->readInstances[$code] = $this->readFactory->create($this->getDirPath($directoryCode), $driverCode);
        }
        return $this->readInstances[$code];
    }

    public function getDirectoryReadByPath($path, $driverCode = DriverPool::FILE)
    {
        return $this->readFactory->create($path, $driverCode);
    }

    public function getDirectoryWrite($directoryCode, $driverCode = DriverPool::FILE)
    {
        $code = $directoryCode . '_' . $driverCode;
        if (!array_key_exists($code, $this->writeInstances)) {
            $this->writeInstances[$code] = $this->writeFactory->create($this->getDirPath($directoryCode), $driverCode);
        }
        return $this->writeInstances[$code];
    }

    protected function getDirPath($code)
    {
        return $this->directoryList->getPath($code);
    }

    public function getUri($code)
    {
        return $this->directoryList->getUrlPath($code);
    }
}