DefaultResolver.php

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<?php
declare(strict_types=1);

namespace Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldName\Resolver;

use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\AttributeAdapter;
use Magento\Elasticsearch\Model\Adapter\FieldMapperInterface;
use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldName\ResolverInterface;
use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\ResolverInterface
    as FieldTypeResolver;
use Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\ConverterInterface
    as FieldTypeConverterInterface;

class DefaultResolver implements ResolverInterface
{
    private $fieldTypeResolver;

    private $fieldTypeConverter;

    public function __construct(
        FieldTypeResolver $fieldTypeResolver,
        FieldTypeConverterInterface $fieldTypeConverter
    ) {
        $this->fieldTypeResolver = $fieldTypeResolver;
        $this->fieldTypeConverter = $fieldTypeConverter;
    }

    public function getFieldName(AttributeAdapter $attribute, $context = []): ?string
    {
        $fieldType = $this->fieldTypeResolver->getFieldType($attribute);
        $attributeCode = $attribute->getAttributeCode();
        $frontendInput = $attribute->getFrontendInput();
        if (empty($context['type'])) {
            $fieldName = $attributeCode;
        } elseif ($context['type'] === FieldMapperInterface::TYPE_FILTER) {
            if ($this->isStringServiceFieldType($fieldType)) {
                return $this->getFieldName(
                    $attribute,
                    array_merge($context, ['type' => FieldMapperInterface::TYPE_QUERY])
                );
            }
            $fieldName = $attributeCode;
        } elseif ($context['type'] === FieldMapperInterface::TYPE_QUERY) {
            $fieldName = $this->getQueryTypeFieldName($frontendInput, $fieldType, $attributeCode);
        } else {
            $fieldName = 'sort_' . $attributeCode;
        }

        return $fieldName;
    }

    private function isStringServiceFieldType(string $serviceFieldType): bool
    {
        $stringTypeKey = $this->fieldTypeConverter->convert(FieldTypeConverterInterface::INTERNAL_DATA_TYPE_STRING);

        return $serviceFieldType === $stringTypeKey;
    }

    private function getQueryTypeFieldName($frontendInput, $fieldType, $attributeCode)
    {
        if ($attributeCode === '*') {
            $fieldName = '_all';
        } else {
            $fieldName = $this->getRefinedFieldName($frontendInput, $fieldType, $attributeCode);
        }
        return $fieldName;
    }

    private function getRefinedFieldName($frontendInput, $fieldType, $attributeCode)
    {
        $stringTypeKey = $this->fieldTypeConverter->convert(FieldTypeConverterInterface::INTERNAL_DATA_TYPE_STRING);
        switch ($frontendInput) {
            case 'select':
            case 'multiselect':
                return in_array($fieldType, [$stringTypeKey, 'integer'], true)
                    ? $attributeCode . '_value'
                    : $attributeCode;
            case 'boolean':
                return $fieldType === 'integer' ? $attributeCode . '_value' : $attributeCode;
            default:
                return $attributeCode;
        }
    }
}