Data.php

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<?php
namespace Magento\Eav\Helper;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    const XML_PATH_VALIDATOR_DATA_INPUT_TYPES = 'general/validator_data/input_types';

    protected $_attributesLockedFields = [];

    protected $_entityTypeFrontendClasses = [];

    protected $_attributeConfig;

    protected $_eavConfig;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Eav\Model\Entity\Attribute\Config $attributeConfig,
        \Magento\Eav\Model\Config $eavConfig
    ) {
        $this->_attributeConfig = $attributeConfig;
        $this->_eavConfig = $eavConfig;
        parent::__construct($context);
    }

    protected function _getDefaultFrontendClasses()
    {
        return [
            ['value' => '', 'label' => __('None')],
            ['value' => 'validate-number', 'label' => __('Decimal Number')],
            ['value' => 'validate-digits', 'label' => __('Integer Number')],
            ['value' => 'validate-email', 'label' => __('Email')],
            ['value' => 'validate-url', 'label' => __('URL')],
            ['value' => 'validate-alpha', 'label' => __('Letters')],
            ['value' => 'validate-alphanum', 'label' => __('Letters (a-z, A-Z) or Numbers (0-9)')]
        ];
    }

    public function getFrontendClasses($entityTypeCode)
    {
        $_defaultClasses = $this->_getDefaultFrontendClasses();

        if (isset($this->_entityTypeFrontendClasses[$entityTypeCode])) {
            return array_merge($_defaultClasses, $this->_entityTypeFrontendClasses[$entityTypeCode]);
        }

        return $_defaultClasses;
    }

    public function getAttributeLockedFields($entityTypeCode)
    {
        if (!$entityTypeCode) {
            return [];
        }
        if (isset($this->_attributesLockedFields[$entityTypeCode])) {
            return $this->_attributesLockedFields[$entityTypeCode];
        }
        $attributesLockedFields = $this->_attributeConfig->getEntityAttributesLockedFields($entityTypeCode);
        if (count($attributesLockedFields)) {
            $this->_attributesLockedFields[$entityTypeCode] = $attributesLockedFields;
            return $this->_attributesLockedFields[$entityTypeCode];
        }
        return [];
    }

    public function getInputTypesValidatorData()
    {
        return $this->scopeConfig->getValue(
            self::XML_PATH_VALIDATOR_DATA_INPUT_TYPES,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getAttributeMetadata($entityTypeCode, $attributeCode)
    {
        $attribute = $this->_eavConfig->getAttribute($entityTypeCode, $attributeCode);
        return [
            'entity_type_id' => $attribute->getEntityTypeId(),
            'attribute_id' => $attribute->getAttributeId(),
            'attribute_table' => $attribute->getBackend()->getTable(),
            'backend_type' => $attribute->getBackendType()
        ];
    }
}