AbstractValidator.php

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<?php
namespace Magento\Framework\Validator;

abstract class AbstractValidator implements \Magento\Framework\Validator\ValidatorInterface
{
    protected static $_defaultTranslator = null;

    protected $_translator = null;

    protected $_messages = [];

    public static function setDefaultTranslator(\Magento\Framework\Translate\AdapterInterface $translator = null)
    {
        self::$_defaultTranslator = $translator;
    }

    public static function getDefaultTranslator()
    {
        return self::$_defaultTranslator;
    }

    public function setTranslator($translator = null)
    {
        $this->_translator = $translator;
        return $this;
    }

    public function getTranslator()
    {
        if ($this->_translator === null) {
            return self::getDefaultTranslator();
        }
        return $this->_translator;
    }

    public function hasTranslator()
    {
        return $this->_translator !== null;
    }

    public function getMessages()
    {
        return $this->_messages;
    }

    public function hasMessages()
    {
        return !empty($this->_messages);
    }

    protected function _clearMessages()
    {
        $this->_messages = [];
    }

    protected function _addMessages(array $messages)
    {
        $this->_messages = array_merge_recursive($this->_messages, $messages);
    }
}