工作流activiti 6 学习笔记十七 实践动态回退

场景：已知当前节点taskid 和 目标taskid（已审批过的）。从当前节点跳转到目标节点。几经百度，发现大家写的都太复杂了，根据大家的思路进行了代码简化。

实现思路：记录当前节点的流向

清理当前节点流向

建立新流向

完成新流向审批

还原原来的流向

@Override
	public String submitRollBack(String currenttaskId,String targettaskId) {
		Task currentTask = ts.createTaskQuery().taskId(currenttaskId).singleResult();
//		Task targetTask = ts.createTaskQuery().taskId(targettaskId).singleResult();
		HistoricTaskInstance  targetTaskH = hs.createHistoricTaskInstanceQuery().taskId(targettaskId).singleResult();
		// 退回到起草人
		String processDefinitionId = currentTask.getProcessDefinitionId();
//		ProcessDefinitionEntity processDefinitionEntity = (ProcessDefinitionEntity) rs.createProcessDefinitionQuery().processDefinitionId(processDefinitionId).singleResult();
		BpmnModel bpmnModel = rs.getBpmnModel(processDefinitionId);
		
		// 目标
		FlowNode myFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(targetTaskH.getTaskDefinitionKey());
		
		Execution execution = runS.createExecutionQuery().executionId(currentTask.getExecutionId()).singleResult();
		String activityId = execution.getActivityId();
		FlowNode flowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(activityId);
		
		//记录原活动方向
		List<SequenceFlow> oriSequenceFlows = new ArrayList<SequenceFlow>();
		oriSequenceFlows.addAll(flowNode.getOutgoingFlows());
		
		//清理活动方向
		flowNode.getOutgoingFlows().clear();
		//建立新方向
		List<SequenceFlow> newSequenceFlowList = new ArrayList<SequenceFlow>();
		SequenceFlow newSequenceFlow = new SequenceFlow();
		newSequenceFlow.setId("tempflowId");
		newSequenceFlow.setSourceFlowElement(flowNode);
		newSequenceFlow.setTargetFlowElement(myFlowNode);
		newSequenceFlowList.add(newSequenceFlow);
		flowNode.setOutgoingFlows(newSequenceFlowList);
		
		//完成任务
		ts.complete(currentTask.getId());
		//恢复原方向
		flowNode.setOutgoingFlows(oriSequenceFlows);