code: @Override
      public DescribeTapesResult describeTapes(DescribeTapesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeTapes(request);
      }
docs: <p>
  Returns a description of the specified Amazon Resource Name (ARN) of virtual tapes. If a <code>TapeARN</code> is
  not specified, returns a description of all virtual tapes associated with the specified gateway. This operation
  is only supported in the tape gateway type.
  </p>
  
  @param describeTapesRequest
  DescribeTapesInput
  @return Result of the DescribeTapes operation returned by the service.
  @throws InvalidGatewayRequestException
  An exception occurred because an invalid gateway request was issued to the service. For more information,
  see the error and message fields.
  @throws InternalServerErrorException
  An internal server error has occurred during the request. For more information, see the error and message
  fields.
  @sample AWSStorageGateway.DescribeTapes
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/DescribeTapes" target="_top">AWS
  API Documentation</a>