code: @Override
      public final Exception isCorrect (final ProtocolDataUnit protocolDataUnit) {
  
          if (protocolDataUnit.getBasicHeaderSegment().getParser() instanceof LoginResponseParser) {
              return null;
          } else {
              return new IllegalStateException(new StringBuilder("Parser ").append(protocolDataUnit.getBasicHeaderSegment().getParser().toString()).append(" is instance of ").append(protocolDataUnit.getBasicHeaderSegment().getParser().getClass().toString()).append(" and not instance if LoginParser!").toString());
          }
  
      }
docs: {@inheritDoc}