Storage.php

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<?php
namespace Magento\Theme\Model\Design\Config;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\Config\Value;
use Magento\Theme\Api\Data\DesignConfigInterface;
use Magento\Framework\DB\TransactionFactory;
use Magento\Framework\App\Config\ValueInterface;
use Magento\Theme\Model\Data\Design\ConfigFactory;
use Magento\Theme\Model\Design\BackendModelFactory;

class Storage
{
    protected $transactionFactory;

    protected $backendModelFactory;

    protected $valueChecker;

    protected $configFactory;

    protected $scopeConfig;

    protected $valueProcessor;

    public function __construct(
        TransactionFactory $transactionFactory,
        BackendModelFactory $backendModelFactory,
        ValueChecker $valueChecker,
        ConfigFactory $configFactory,
        ScopeConfigInterface $scopeConfig,
        ValueProcessor $valueProcessor
    ) {
        $this->transactionFactory = $transactionFactory;
        $this->backendModelFactory = $backendModelFactory;
        $this->valueChecker = $valueChecker;
        $this->configFactory = $configFactory;
        $this->scopeConfig = $scopeConfig;
        $this->valueProcessor = $valueProcessor;
    }

    public function load($scope, $scopeId)
    {
        $designConfig = $this->configFactory->create($scope, $scopeId);
        $fieldsData = $designConfig->getExtensionAttributes()->getDesignConfigData();
        foreach ($fieldsData as &$fieldData) {
            $value = $this->valueProcessor->process(
                $this->scopeConfig->getValue($fieldData->getPath(), $scope, $scopeId),
                $scope,
                $scopeId,
                $fieldData->getFieldConfig()
            );

            if ($value === null) {
                $value = '';
            }
            $fieldData->setValue($value);
        }

        return $designConfig;
    }

    public function save(DesignConfigInterface $designConfig)
    {
        $fieldsData = $designConfig->getExtensionAttributes()->getDesignConfigData();
        /* @var $saveTransaction \Magento\Framework\DB\Transaction */
        $saveTransaction = $this->transactionFactory->create();
        /* @var $deleteTransaction \Magento\Framework\DB\Transaction */
        $deleteTransaction = $this->transactionFactory->create();
        foreach ($fieldsData as $fieldData) {
            $backendModel = $this->backendModelFactory->create([
                'value' => $fieldData->getValue(),
                'scope' => $designConfig->getScope(),
                'scopeId' => $designConfig->getScopeId(),
                'config' => $fieldData->getFieldConfig()
            ]);

            if ($fieldData->getValue() !== null
                && $this->valueChecker->isDifferentFromDefault(
                    $fieldData->getValue(),
                    $designConfig->getScope(),
                    $designConfig->getScopeId(),
                    $fieldData->getFieldConfig()
                )
            ) {
                $saveTransaction->addObject($backendModel);
            } elseif (!$backendModel->isObjectNew()) {
                $deleteTransaction->addObject($backendModel);
            }
        }
        $saveTransaction->save();
        $deleteTransaction->delete();
    }

    public function delete(DesignConfigInterface $designConfig)
    {
        $fieldsData = $designConfig->getExtensionAttributes()->getDesignConfigData();
        /* @var $deleteTransaction \Magento\Framework\DB\Transaction */
        $deleteTransaction = $this->transactionFactory->create();
        foreach ($fieldsData as $fieldData) {
            $backendModel = $this->backendModelFactory->create([
                'value' => $fieldData->getValue(),
                'scope' => $designConfig->getScope(),
                'scopeId' => $designConfig->getScopeId(),
                'config' => $fieldData->getFieldConfig()
            ]);
            if (!$backendModel->isObjectNew()) {
                $deleteTransaction->addObject($backendModel);
            }
        }
        $deleteTransaction->delete();
    }
}