Timestamp.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Dto\Factories;

use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Stdlib\BooleanUtils;

class Timestamp implements FactoryInterface
{
    const NULL_TIMESTAMP = 'NULL';

    private $objectManager;

    private $className;

    private $booleanUtils;

    public function __construct(
        ObjectManagerInterface $objectManager,
        BooleanUtils $booleanUtils,
        $className = \Magento\Framework\Setup\Declaration\Schema\Dto\Columns\Timestamp::class
    ) {
        $this->objectManager = $objectManager;
        $this->className = $className;
        $this->booleanUtils = $booleanUtils;
    }

    public function create(array $data)
    {
        $data['onUpdate'] = isset($data['on_update']) ? $data['on_update'] : null;
        //OnUpdate is boolean as there is only one possible value for onUpdate statement.
        if ($data['onUpdate'] && $data['onUpdate'] !== 'CURRENT_TIMESTAMP') {
            if ($this->booleanUtils->toBoolean($data['onUpdate'])) {
                $data['onUpdate'] = 'CURRENT_TIMESTAMP';
            } else {
                unset($data['onUpdate']);
            }
        }
        //By default default attribute is not used.
        if (!isset($data['default'])) {
            $data['default'] = self::NULL_TIMESTAMP;
        }

        return $this->objectManager->create($this->className, $data);
    }
}