Write.php

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<?php
namespace Magento\Framework\Filesystem\File;

use Magento\Framework\Filesystem\DriverInterface;
use Magento\Framework\Exception\FileSystemException;

class Write extends Read implements WriteInterface
{
    public function __construct($path, DriverInterface $driver, $mode)
    {
        $this->mode = $mode;
        parent::__construct($path, $driver);
    }

    protected function assertValid()
    {
        $fileExists = $this->driver->isExists($this->path);
        if (!$fileExists && preg_match('/r/', $this->mode)) {
            throw new FileSystemException(
                new \Magento\Framework\Phrase('The "%1" file doesn\'t exist.', [$this->path])
            );
        } elseif ($fileExists && preg_match('/x/', $this->mode)) {
            throw new FileSystemException(new \Magento\Framework\Phrase('The file "%1" already exists', [$this->path]));
        }
    }

    public function write($data)
    {
        try {
            return $this->driver->fileWrite($this->resource, $data);
        } catch (FileSystemException $e) {
            throw new FileSystemException(
                new \Magento\Framework\Phrase('Cannot write to the "%1" file. %2', [$this->path, $e->getMessage()])
            );
        }
    }

    public function writeCsv(array $data, $delimiter = ',', $enclosure = '"')
    {
        try {
            return $this->driver->filePutCsv($this->resource, $data, $delimiter, $enclosure);
        } catch (FileSystemException $e) {
            throw new FileSystemException(
                new \Magento\Framework\Phrase('Cannot write to the "%1" file. %2', [$this->path, $e->getMessage()])
            );
        }
    }

    public function flush()
    {
        try {
            return $this->driver->fileFlush($this->resource);
        } catch (FileSystemException $e) {
            throw new FileSystemException(
                new \Magento\Framework\Phrase('Cannot flush the "%1" file. %2', [$this->path, $e->getMessage()])
            );
        }
    }

    public function lock($lockMode = \LOCK_EX)
    {
        return $this->driver->fileLock($this->resource, $lockMode);
    }

    public function unlock()
    {
        return $this->driver->fileUnlock($this->resource);
    }
}