Group.php

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<?php
namespace Magento\Customer\Model;

class Group extends \Magento\Framework\Model\AbstractModel
{
    const NOT_LOGGED_IN_ID = 0;

    const CUST_GROUP_ALL = 32000;

    const ENTITY = 'customer_group';

    const GROUP_CODE_MAX_LENGTH = 32;

    protected $_eventPrefix = 'customer_group';

    protected $_eventObject = 'object';

    protected $_storesConfig;

    protected $dataObjectProcessor;

    protected $classModelFactory;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Store\Model\StoresConfig $storesConfig,
        \Magento\Framework\Reflection\DataObjectProcessor $dataObjectProcessor,
        \Magento\Tax\Model\ClassModelFactory $classModelFactory,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_storesConfig = $storesConfig;
        $this->dataObjectProcessor = $dataObjectProcessor;
        $this->classModelFactory = $classModelFactory;
        parent::__construct(
            $context,
            $registry,
            $resource,
            $resourceCollection,
            $data
        );
    }

    protected function _construct()
    {
        $this->_init(\Magento\Customer\Model\ResourceModel\Group::class);
    }

    public function setCode($value)
    {
        return $this->setCustomerGroupCode($value);
    }

    public function getCode()
    {
        return $this->getCustomerGroupCode();
    }

    public function getTaxClassName()
    {
        $taxClassName = $this->getData('tax_class_name');
        if ($taxClassName) {
            return $taxClassName;
        }
        $classModel = $this->classModelFactory->create();
        $classModel->load($this->getTaxClassId());
        $taxClassName = $classModel->getClassName();
        $this->setData('tax_class_name', $taxClassName);
        return $taxClassName;
    }

    public function usesAsDefault()
    {
        $data = $this->_storesConfig->getStoresConfigByPath(
            GroupManagement::XML_PATH_DEFAULT_ID
        );
        if (in_array($this->getId(), $data)) {
            return true;
        }
        return false;
    }

    public function beforeSave()
    {
        $this->_prepareData();
        return parent::beforeSave();
    }

    protected function _prepareData()
    {
        $this->setCode(substr($this->getCode(), 0, self::GROUP_CODE_MAX_LENGTH));
        return $this;
    }
}