DataObject.php

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<?php
namespace Magento\Framework\Validator;

class DataObject implements \Zend_Validate_Interface
{
    private $_rules = [];

    private $_messages = [];

    public function addRule(\Zend_Validate_Interface $validator, $fieldName = '')
    {
        if (!array_key_exists($fieldName, $this->_rules)) {
            $this->_rules[$fieldName] = $validator;
        } else {
            $existingValidator = $this->_rules[$fieldName];
            if (!$existingValidator instanceof \Zend_Validate) {
                $compositeValidator = new \Zend_Validate();
                $compositeValidator->addValidator($existingValidator);
                $this->_rules[$fieldName] = $compositeValidator;
            }
            $this->_rules[$fieldName]->addValidator($validator);
        }
        return $this;
    }

    public function isValid($entity)
    {
        $this->_messages = [];
        foreach ($this->_rules as $fieldName => $validator) {
            $value = $fieldName ? $entity->getDataUsingMethod($fieldName) : $entity;
            if (!$validator->isValid($value)) {
                $this->_messages = array_merge($this->_messages, array_values($validator->getMessages()));
            }
        }
        return empty($this->_messages);
    }

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