Fixture.php

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<?php
namespace Magento\Setup\Fixtures;

use Symfony\Component\Console\Output\OutputInterface;

abstract class Fixture
{
    protected $priority;

    protected $fixtureModel;

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

    abstract public function execute();

    abstract public function getActionTitle();

    public function printInfo(OutputInterface $output)
    {
        foreach ($this->introduceParamLabels() as $configName => $label) {
            $configValue = $this->fixtureModel->getValue($configName);
            $generationCount = is_array($configValue) === true
                ? count($configValue[array_keys($configValue)[0]])
                : $configValue;

            if (!empty($generationCount)) {
                $output->writeln('<info> |- ' . $label . ': ' . $generationCount . '</info>');
            }
        }
    }

    abstract public function introduceParamLabels();

    public function getPriority()
    {
        return $this->priority;
    }
}