public string generate(string nidHttpResFunc)
        {
            var returnNode = new NRFunctionNode();
            var switchNode = new NRSwitchNode(NRSwitchNode.PropertyType.GLOBAL, property: "currStep",
                                              checkall: false);
            var i        = 0;
            var behavior = _activity.Behavior;

            foreach (var stepTiming in behavior.StepTimings)
            {
                var nidStep = generateStepFlow(stepTiming, returnNode.Id);
                var rule    = new NRSwitchRule(NRSwitchRule.OperatorType.EQ, (i + 1).ToString(),
                                               NRSwitchRule.ValueType.Num);
                switchNode.AddRule(rule);
                switchNode.Wire(nidStep, i);
                ++i;
            }
            returnNode.Wire(nidHttpResFunc);
            returnNode.WriteTo(_writer);
            switchNode.WriteTo(_writer);
            return(switchNode.Id);
        }
        private string generateSwitchActivityFlow(IEnumerable <string> nidsActivity, string nidHttpRes)
        {
            var switchNode = new NRSwitchNode(NRSwitchNode.PropertyType.GLOBAL, property: "currActivity",
                                              checkall: false);
            var          i = 0;
            NRSwitchRule rule;

            foreach (var nid in nidsActivity)
            {
                rule = new NRSwitchRule(NRSwitchRule.OperatorType.EQ, (i + 1).ToString(),
                                        NRSwitchRule.ValueType.Num);
                switchNode.AddRule(rule);
                switchNode.Wire(nid, i);
                ++i;
            }

            var nidEndOfTask = generateHttpResFuncNode(nidHttpRes, i, 1, true);

            rule = new NRSwitchRule(NRSwitchRule.OperatorType.EQ, (i + 1).ToString(), NRSwitchRule.ValueType.Num);
            switchNode.AddRule(rule);
            switchNode.Wire(nidEndOfTask, i);
            switchNode.WriteTo(_writer);
            return(switchNode.Id);
        }