AggregatedFieldDataConverter.php

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<?php
namespace Magento\Framework\DB;

use Magento\Framework\DB\Adapter\AdapterInterface;

class AggregatedFieldDataConverter
{
    private $fieldDataConverterFactory;

    private $fieldDataConverters = [];

    public function __construct(
        FieldDataConverterFactory $fieldDataConverterFactory
    ) {
        $this->fieldDataConverterFactory = $fieldDataConverterFactory;
    }

    public function convert(array $fieldsToUpdate, AdapterInterface $connection)
    {
        foreach ($fieldsToUpdate as $field) {
            $fieldDataConverter = $this->getFieldDataConverter($field->getDataConverterClass());
            $fieldDataConverter->convert(
                $connection,
                $field->getTableName(),
                $field->getIdentifierField(),
                $field->getFieldName(),
                $field->getQueryModifier()
            );
        }
    }

    private function getFieldDataConverter($dataConverterClassName)
    {
        if (!isset($this->fieldDataConverters[$dataConverterClassName])) {
            $this->fieldDataConverters[$dataConverterClassName] = $this->fieldDataConverterFactory->create(
                $dataConverterClassName
            );
        }
        return $this->fieldDataConverters[$dataConverterClassName];
    }
}