code: public static Object getInput(Message message, KnowledgeOperation operation, KnowledgeRuntimeEngine runtime) {
          List<Object> list = getList(message, operation.getInputExpressionMappings());
          switch (list.size()) {
          case 0:
              return filterRemoteDefaultInputContent(message.getContent(), runtime);
          case 1:
              return list.get(0);
          default:
              return list;
          }
      }
docs: Gets the input.
  
  @param message the message
  @param operation the operation
  @param runtime the runtime engine
  @return the input