Constraint.php

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<?php
namespace Magento\Framework\Validator;

class Constraint extends \Magento\Framework\Validator\AbstractValidator
{
    protected $_wrappedValidator;

    protected $_alias;

    public function __construct(\Magento\Framework\Validator\ValidatorInterface $validator, $alias = null)
    {
        $this->_wrappedValidator = $validator;
        $this->_alias = $alias;
    }

    public function isValid($value)
    {
        $result = true;
        $this->_clearMessages();

        if (!$this->_wrappedValidator->isValid($this->_getValidatorValue($value))) {
            $this->_addMessages($this->_wrappedValidator->getMessages());
            $result = false;
        }

        return $result;
    }

    protected function _getValidatorValue($value)
    {
        if (is_array($value)) {
            $value = new \Magento\Framework\DataObject($value);
        }
        return $value;
    }

    public function getAlias()
    {
        return $this->_alias;
    }

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

    public function getTranslator()
    {
        return $this->_wrappedValidator->getTranslator();
    }
}