FieldNamer.php

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<?php
namespace Magento\Framework\Reflection;

use Magento\Framework\Api\SimpleDataObjectConverter;

class FieldNamer
{
    const IS_METHOD_PREFIX = 'is';
    const HAS_METHOD_PREFIX = 'has';
    const GETTER_PREFIX = 'get';
    
    public function getFieldNameForMethodName($methodName)
    {
        if (substr($methodName, 0, 2) === self::IS_METHOD_PREFIX) {
            return SimpleDataObjectConverter::camelCaseToSnakeCase(substr($methodName, 2));
        } elseif (substr($methodName, 0, 3) === self::HAS_METHOD_PREFIX) {
            return SimpleDataObjectConverter::camelCaseToSnakeCase(substr($methodName, 3));
        } elseif (substr($methodName, 0, 3) === self::GETTER_PREFIX) {
            return SimpleDataObjectConverter::camelCaseToSnakeCase(substr($methodName, 3));
        }

        return null;
    }
}