ScalarTypes.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\GraphQl\Schema\Type;

class ScalarTypes
{
    public function isScalarType(string $typeName) : bool
    {
        $internalTypes = \GraphQL\Type\Definition\Type::getInternalTypes();
        return isset($internalTypes[$typeName]) ? true : false;
    }

    public function getScalarTypeInstance(string $typeName) : \GraphQL\Type\Definition\Type
    {
        $internalTypes = \GraphQL\Type\Definition\Type::getInternalTypes();
        if ($this->isScalarType($typeName)) {
            return $internalTypes[$typeName];
        } else {
            throw new \LogicException(sprintf('Scalar type %s doesn\'t exist', $typeName));
        }
    }

    public function createList(\GraphQL\Type\Definition\Type $definedType) : ListOfType
    {
        return new ListOfType($definedType);
    }

    public function createNonNull(\GraphQL\Type\Definition\Type $definedType) : NonNull
    {
        return new NonNull($definedType);
    }
}