package com.ruoyi.flowable.flow; import com.googlecode.aviator.AviatorEvaluator; import com.googlecode.aviator.Expression; //import com.greenpineyu.fel.FelEngine; //import com.greenpineyu.fel.FelEngineImpl; //import com.greenpineyu.fel.context.FelContext; import org.flowable.bpmn.model.Process; import org.flowable.bpmn.model.*; import org.flowable.engine.RepositoryService; import org.flowable.engine.TaskService; import org.flowable.engine.repository.ProcessDefinition; import java.util.ArrayList; import java.util.Collection; import java.util.List; import java.util.Map; /** * @author Xuan xuan * @date 2021/4/19 20:51 */ public class FindNextNodeUtil { /** * 获取下一步骤的用户任务 * * @param repositoryService * @param map * @return */ public static List getNextUserTasks(RepositoryService repositoryService, org.flowable.task.api.Task task, Map map) { List data = new ArrayList<>(); ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().processDefinitionId(task.getProcessDefinitionId()).singleResult(); BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinition.getId()); Process mainProcess = bpmnModel.getMainProcess(); Collection flowElements = mainProcess.getFlowElements(); String key = task.getTaskDefinitionKey(); FlowElement flowElement = bpmnModel.getFlowElement(key); next(flowElements, flowElement, map, data); return data; } public static void next(Collection flowElements, FlowElement flowElement, Map map, List nextUser) { //如果是结束节点 if (flowElement instanceof EndEvent) { //如果是子任务的结束节点 if (getSubProcess(flowElements, flowElement) != null) { flowElement = getSubProcess(flowElements, flowElement); } } //获取Task的出线信息--可以拥有多个 List outGoingFlows = null; if (flowElement instanceof Task) { outGoingFlows = ((Task) flowElement).getOutgoingFlows(); } else if (flowElement instanceof Gateway) { outGoingFlows = ((Gateway) flowElement).getOutgoingFlows(); } else if (flowElement instanceof StartEvent) { outGoingFlows = ((StartEvent) flowElement).getOutgoingFlows(); } else if (flowElement instanceof SubProcess) { outGoingFlows = ((SubProcess) flowElement).getOutgoingFlows(); } else if (flowElement instanceof CallActivity) { outGoingFlows = ((CallActivity) flowElement).getOutgoingFlows(); } if (outGoingFlows != null && outGoingFlows.size() > 0) { //遍历所有的出线--找到可以正确执行的那一条 for (SequenceFlow sequenceFlow : outGoingFlows) { //1.有表达式，且为true //2.无表达式 String expression = sequenceFlow.getConditionExpression(); if (expression == null || expressionResult(map, expression.substring(expression.lastIndexOf("{") + 1, expression.lastIndexOf("}")))) { //出线的下一节点 String nextFlowElementID = sequenceFlow.getTargetRef(); if (checkSubProcess(nextFlowElementID, flowElements, nextUser)) { continue; } //查询下一节点的信息 FlowElement nextFlowElement = getFlowElementById(nextFlowElementID, flowElements); //调用流程 if (nextFlowElement instanceof CallActivity) { CallActivity ca = (CallActivity) nextFlowElement; if (ca.getLoopCharacteristics() != null) { UserTask userTask = new UserTask(); userTask.setId(ca.getId()); userTask.setId(ca.getId()); userTask.setLoopCharacteristics(ca.getLoopCharacteristics()); userTask.setName(ca.getName()); nextUser.add(userTask); } next(flowElements, nextFlowElement, map, nextUser); } //用户任务 if (nextFlowElement instanceof UserTask) { nextUser.add((UserTask) nextFlowElement); } //排他网关 else if (nextFlowElement instanceof ExclusiveGateway) { next(flowElements, nextFlowElement, map, nextUser); } //并行网关 else if (nextFlowElement instanceof ParallelGateway) { next(flowElements, nextFlowElement, map, nextUser); } //接收任务 else if (nextFlowElement instanceof ReceiveTask) { next(flowElements, nextFlowElement, map, nextUser); } //服务任务 else if (nextFlowElement instanceof ServiceTask) { next(flowElements, nextFlowElement, map, nextUser); } //子任务的起点 else if (nextFlowElement instanceof StartEvent) { next(flowElements, nextFlowElement, map, nextUser); } //结束节点 else if (nextFlowElement instanceof EndEvent) { next(flowElements, nextFlowElement, map, nextUser); } } } } } /** * 判断是否是多实例子流程并且需要设置集合类型变量 */ public static boolean checkSubProcess(String Id, Collection flowElements, List nextUser) { for (FlowElement flowElement1 : flowElements) { if (flowElement1 instanceof SubProcess && flowElement1.getId().equals(Id)) { SubProcess sp = (SubProcess) flowElement1; if (sp.getLoopCharacteristics() != null) { String inputDataItem = sp.getLoopCharacteristics().getInputDataItem(); UserTask userTask = new UserTask(); userTask.setId(sp.getId()); userTask.setLoopCharacteristics(sp.getLoopCharacteristics()); userTask.setName(sp.getName()); nextUser.add(userTask); return true; } } } return false; } /** * 查询一个节点的是否子任务中的节点，如果是，返回子任务 * * @param flowElements 全流程的节点集合 * @param flowElement 当前节点 * @return */ public static FlowElement getSubProcess(Collection flowElements, FlowElement flowElement) { for (FlowElement flowElement1 : flowElements) { if (flowElement1 instanceof SubProcess) { for (FlowElement flowElement2 : ((SubProcess) flowElement1).getFlowElements()) { if (flowElement.equals(flowElement2)) { return flowElement1; } } } } return null; } /** * 根据ID查询流程节点对象, 如果是子任务，则返回子任务的开始节点 * * @param Id 节点ID * @param flowElements 流程节点集合 * @return */ public static FlowElement getFlowElementById(String Id, Collection flowElements) { for (FlowElement flowElement : flowElements) { if (flowElement.getId().equals(Id)) { //如果是子任务，则查询出子任务的开始节点 if (flowElement instanceof SubProcess) { return getStartFlowElement(((SubProcess) flowElement).getFlowElements()); } return flowElement; } if (flowElement instanceof SubProcess) { FlowElement flowElement1 = getFlowElementById(Id, ((SubProcess) flowElement).getFlowElements()); if (flowElement1 != null) { return flowElement1; } } } return null; } /** * 返回流程的开始节点 * * @param flowElements 节点集合 * @description: */ public static FlowElement getStartFlowElement(Collection flowElements) { for (FlowElement flowElement : flowElements) { if (flowElement instanceof StartEvent) { return flowElement; } } return null; } /** * 校验el表达式 * * @param map * @param expression * @return */ public static boolean expressionResult(Map map, String expression) { Expression exp = AviatorEvaluator.compile(expression); final Object execute = exp.execute(map); return Boolean.parseBoolean(String.valueOf(execute)); } }