method on

Source

ErrorHandlerCollection on(Type errorType, middlewareA, [middlewareB = nothing, middlewareC = nothing,
    middlewareD = nothing, middlewareE = nothing, middlewareF = nothing, middlewareG = nothing,
    middlewareH = nothing, middlewareI = nothing, middlewareJ = nothing, middlewareK = nothing,
    middlewareL = nothing, middlewareM = nothing, middlewareN = nothing, middlewareO = nothing,
    middlewareP = nothing, middlewareQ = nothing, middlewareR = nothing, middlewareS = nothing,
    middlewareT = nothing, middlewareU = nothing, middlewareV = nothing, middlewareW = nothing,
    middlewareX = nothing, middlewareY = nothing, middlewareZ = nothing]) {
  final Iterable middlewareTokens = [middlewareA, middlewareB,
  middlewareC, middlewareD, middlewareE, middlewareF, middlewareG, middlewareH,
  middlewareI, middlewareJ, middlewareK, middlewareL, middlewareM, middlewareN,
  middlewareO, middlewareP, middlewareQ, middlewareR, middlewareS, middlewareT,
  middlewareU, middlewareV, middlewareW, middlewareX, middlewareY, middlewareZ
  ].where((m) => m != nothing);
  for (final type in _catches.keys) {
    if (reflectType(type).isSubtypeOf(reflectType(errorType))) {
      throw new BadErrorHandlerOrderException(
        "$type is a subtype of $errorType and should therefore be "
        "added after $errorType in the handler chain.\n\n"
        "    ErrorHandlerMiddleware\n"
        "      .on($errorType, _handle$errorType)\n"
        "      .on($type, _handle$type);\n"
      );
    }
  }
  return new ErrorHandlerCollection(
    <Type, Pipeline>{}
    ..addAll(_catches)
    ..addAll({errorType: pipeActual(resolveMiddleware(middlewareTokens))})
  );
}