package cn.iocoder.yudao.module.bpm.framework.flowable.core.candidate.strategy.other;
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import cn.iocoder.yudao.framework.common.util.collection.CollectionUtils;
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import cn.iocoder.yudao.module.bpm.framework.flowable.core.candidate.BpmTaskCandidateStrategy;
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import cn.iocoder.yudao.module.bpm.framework.flowable.core.enums.BpmTaskCandidateStrategyEnum;
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import cn.iocoder.yudao.module.bpm.framework.flowable.core.util.FlowableUtils;
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import com.google.common.collect.Sets;
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import lombok.extern.slf4j.Slf4j;
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import org.flowable.bpmn.model.BpmnModel;
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import org.flowable.common.engine.api.FlowableException;
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import org.flowable.common.engine.impl.javax.el.PropertyNotFoundException;
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import org.flowable.engine.delegate.DelegateExecution;
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import org.springframework.stereotype.Component;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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/**
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* 流程表达式 {@link BpmTaskCandidateStrategy} 实现类
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*
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* @author 芋道源码
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*/
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@Component
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@Slf4j
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public class BpmTaskCandidateExpressionStrategy implements BpmTaskCandidateStrategy {
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@Override
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public BpmTaskCandidateStrategyEnum getStrategy() {
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return BpmTaskCandidateStrategyEnum.EXPRESSION;
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}
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@Override
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public void validateParam(String param) {
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// do nothing 因为它基本做不了校验
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}
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@Override
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public Set<Long> calculateUsersByTask(DelegateExecution execution, String param) {
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Object result = FlowableUtils.getExpressionValue(execution, param);
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return CollectionUtils.toLinkedHashSet(Long.class, result);
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}
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@Override
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public Set<Long> calculateUsersByActivity(BpmnModel bpmnModel, String activityId, String param,
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Long startUserId, String processDefinitionId, Map<String, Object> processVariables) {
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Map<String, Object> variables = processVariables == null ? new HashMap<>() : processVariables;
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try {
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Object result = FlowableUtils.getExpressionValue(variables, param);
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return CollectionUtils.toLinkedHashSet(Long.class, result);
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} catch (FlowableException ex) {
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// 预测未运行的节点时候，表达式如果包含 execution 或者不存在的流程变量会抛异常，此时忽略该异常！相当于说，不做流程预测！！！
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if (ex.getCause() != null && ex.getCause() instanceof PropertyNotFoundException) {
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return Sets.newHashSet();
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}
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log.error("[calculateUsersByActivity][表达式({}) 变量({}) 解析报错", param, variables, ex);
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throw ex;
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}
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}
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}
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