Factory.php

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<?php
namespace Magento\Framework\Message;

use Magento\Framework\ObjectManagerInterface;

class Factory
{
    protected $types = [
        MessageInterface::TYPE_ERROR,
        MessageInterface::TYPE_WARNING,
        MessageInterface::TYPE_NOTICE,
        MessageInterface::TYPE_SUCCESS,
    ];

    protected $objectManager;

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

    public function create($type, $text = null)
    {
        if (!in_array($type, $this->types)) {
            throw new \InvalidArgumentException('Wrong message type');
        }

        $className = 'Magento\\Framework\\Message\\' . ucfirst($type);

        $message = $this->objectManager->create($className, $text === null ? [] : ['text' => $text]);
        if (!$message instanceof MessageInterface) {
            throw new \InvalidArgumentException(
                $className . ' doesn\'t implement \Magento\Framework\Message\MessageInterface'
            );
        }

        return $message;
    }
}