package com.iailab.module.bpm.framework.flowable.core.candidate.expression;
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import com.iailab.framework.common.util.number.NumberUtils;
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import com.iailab.module.bpm.service.task.BpmProcessInstanceService;
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import com.iailab.module.system.api.dept.DeptApi;
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import com.iailab.module.system.api.dept.dto.DeptRespDTO;
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import com.iailab.module.system.api.user.AdminUserApi;
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import com.iailab.module.system.api.user.dto.AdminUserRespDTO;
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import org.flowable.engine.delegate.DelegateExecution;
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import org.flowable.engine.runtime.ProcessInstance;
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import org.springframework.stereotype.Component;
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import org.springframework.util.Assert;
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import javax.annotation.Resource;
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import java.util.Set;
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import static com.iailab.framework.common.util.collection.SetUtils.asSet;
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import static java.util.Collections.emptySet;
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/**
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* 分配给发起人的 Leader 审批的 Expression 流程表达式
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* 目前 Leader 的定义是,发起人所在部门的 Leader
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*
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* @author iailab
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*/
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@Component
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public class BpmTaskAssignLeaderExpression {
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@Resource
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private AdminUserApi adminUserApi;
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@Resource
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private DeptApi deptApi;
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@Resource
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private BpmProcessInstanceService processInstanceService;
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/**
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* 计算审批的候选人
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*
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* @param execution 流程执行实体
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* @param level 指定级别
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* @return 指定级别的领导
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*/
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public Set<Long> calculateUsers(DelegateExecution execution, int level) {
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Assert.isTrue(level > 0, "level 必须大于 0");
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// 获得发起人
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ProcessInstance processInstance = processInstanceService.getProcessInstance(execution.getProcessInstanceId());
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Long startUserId = NumberUtils.parseLong(processInstance.getStartUserId());
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// 获得对应 leve 的部门
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DeptRespDTO dept = null;
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for (int i = 0; i < level; i++) {
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// 获得 level 对应的部门
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if (dept == null) {
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dept = getStartUserDept(startUserId);
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if (dept == null) { // 找不到发起人的部门,所以无法使用该规则
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return emptySet();
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}
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} else {
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DeptRespDTO parentDept = deptApi.getDept(dept.getParentId()).getCheckedData();
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if (parentDept == null) { // 找不到父级部门,所以只好结束寻找。原因是:例如说,级别比较高的人,所在部门层级比较少
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break;
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}
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dept = parentDept;
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}
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}
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return dept.getLeaderUserId() != null ? asSet(dept.getLeaderUserId()) : emptySet();
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}
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private DeptRespDTO getStartUserDept(Long startUserId) {
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AdminUserRespDTO startUser = adminUserApi.getUser(startUserId).getCheckedData();
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if (startUser.getDeptId() == null) { // 找不到部门,所以无法使用该规则
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return null;
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}
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return deptApi.getDept(startUser.getDeptId()).getCheckedData();
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}
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}
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