Exception.php

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<?php
namespace Magento\Framework\Validator;

use Magento\Framework\Exception\InputException;
use Magento\Framework\Phrase;
use Magento\Framework\Message\AbstractMessage;
use Magento\Framework\Message\Error;

class Exception extends InputException
{
    protected $messages = [];

    public function __construct(
        Phrase $phrase = null,
        \Exception $cause = null,
        array $messages = [],
        $code = 0
    ) {
        if (!empty($messages)) {
            $message = '';
            foreach ($messages as $propertyMessages) {
                foreach ($propertyMessages as $propertyMessage) {
                    if ($message) {
                        $message .= PHP_EOL;
                    }
                    $message .= $propertyMessage;
                    $this->addMessage(new Error($propertyMessage));
                }
            }
            $phrase = new Phrase($message);
        }
        parent::__construct($phrase, $cause, $code);
    }

    public function addMessage(AbstractMessage $message)
    {
        if (!isset($this->messages[$message->getType()])) {
            $this->messages[$message->getType()] = [];
        }
        $this->messages[$message->getType()][] = $message;
        return $this;
    }

    public function getMessages($type = '')
    {
        if ('' == $type) {
            $allMessages = [];
            foreach ($this->messages as $messages) {
                $allMessages = array_merge($allMessages, $messages);
            }
            return $allMessages;
        }
        return $this->messages[$type] ?? [];
    }
}