AbstractWriter.php

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<?php
namespace Magento\Setup\Module\Dependency\Report\Writer\Csv;

use Magento\Setup\Module\Dependency\Report\Data\ConfigInterface;
use Magento\Setup\Module\Dependency\Report\WriterInterface;

abstract class AbstractWriter implements WriterInterface
{
    protected $writer;

    public function __construct($writer)
    {
        $this->writer = $writer;
    }

    public function write(array $options, ConfigInterface $config)
    {
        $this->checkOptions($options);

        $this->writeToFile($options['report_filename'], $this->prepareData($config));
    }

    protected function checkOptions($options)
    {
        if (!isset($options['report_filename']) || empty($options['report_filename'])) {
            throw new \InvalidArgumentException('Writing error: Passed option "report_filename" is wrong.');
        }
    }

    abstract protected function prepareData($config);

    protected function writeToFile($filename, $data)
    {
        $this->writer->saveData($filename, $data);
    }
}