Examples of org.fireflow.engine.IWorkItem.withdraw()

org.fireflow.engine.IWorkItem.withdraw()

对已经结束的工作项执行取回操作
只有满足如下约束才能正确执行取回操作：
1) 下一个Activity只有Form类型的Task,没有Tool类型和Subflow类型的Task
2) 下一个环节的所有WorkItem还没有被签收，都处于Initialized状态，
如果在本WorkItem成功执行了jumpTo操作或者loopTo操作，只要满足上述条件，也可以成功执行withdraw。
该方法和IWorkflowSession.withdrawWorkItem(String workItemId)等价。 @return 如果取回成功，则创建一个新的WorkItem 并返回该WorkItem @throws org.fireflow.engine.EngineException @throws org.fireflow.kenel.KenelException

   * @see org.fireflow.engine.IWorkflowSession#withdrawWorkItem(java.lang.String)
   */
  public IWorkItem withdrawWorkItem(final String workItemId)
      throws EngineException, KernelException {
    IWorkItem wi = this.findWorkItemById(workItemId);
    return wi.withdraw();
  }


  public void clearAttributes() {
    this.attributes.clear();

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