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<?php
declare(strict_types=1);
namespace OpenTelemetry\Contrib\Otlp;
use OpenTelemetry\SDK\Common\Configuration\KnownValues;
use UnexpectedValueException;
class Protocols
{
public const GRPC = KnownValues::VALUE_GRPC;
public const HTTP_PROTOBUF = KnownValues::VALUE_HTTP_PROTOBUF;
public const HTTP_JSON = KnownValues::VALUE_HTTP_JSON;
public const HTTP_NDJSON = KnownValues::VALUE_HTTP_NDJSON;
private const PROTOCOLS = [
self::GRPC => ContentTypes::PROTOBUF,
self::HTTP_PROTOBUF => ContentTypes::PROTOBUF,
self::HTTP_JSON => ContentTypes::JSON,
self::HTTP_NDJSON => ContentTypes::NDJSON,
];
public static function validate(string $protocol): void
{
if (!array_key_exists($protocol, self::PROTOCOLS)) {
throw new UnexpectedValueException('Unknown protocol: ' . $protocol);
}
}
public static function contentType(string $protocol): string
{
self::validate($protocol);
return self::PROTOCOLS[$protocol];
}
}
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