Property.php

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<?php
namespace Magento\Framework\Validator\Constraint;

class Property extends \Magento\Framework\Validator\Constraint
{
    protected $_property;

    public function __construct(\Magento\Framework\Validator\ValidatorInterface $validator, $property, $alias = null)
    {
        parent::__construct($validator, $alias);
        $this->_property = $property;
    }

    protected function _getValidatorValue($value)
    {
        $result = null;

        if ($value instanceof \Magento\Framework\DataObject) {
            $result = $value->getDataUsingMethod($this->_property);
        } elseif ((is_array($value) || $value instanceof \ArrayAccess) && isset($value[$this->_property])) {
            $result = $value[$this->_property];
        }

        return $result;
    }

    protected function _addMessages(array $messages)
    {
        $this->_messages[$this->_property] = $messages;
    }
}