私有方法四

/**     * @author : lKF35745     * @version: 1.0     * <p>时间 : 2011-1-7</p>     * <p>描述 : 根据子会议ID查询出子会议的所有上级会议ID</p>     * <p>Copyright 1988-2005, Huawei Tech. Co., Ltd.</p>     * @param conferenceID 会议ID     * @return List<String> 子会议的上级会议ID     */        private List<String> findParentNodeByConferenceID(String conferenceID,            CascadeTopoTree cascadeTree)    {                if (logger.isDebugEnabled())        {            logger.debug("begin to findParentNodeByConferenceID and param is "                    + conferenceID);        }                if (null == conferenceID)        {            logger.warn("ConferenceID is null.");            return null;        }        //存储子会议上级的会议ID        List<String> conferenceIdList = new ArrayList<String>();        //实例化一个拓扑树对象        CascadeTopoTree cascadeTopoTree = cascadeTree;                //查询该子会议是否在        SubConferenceNode subConferenceNode = cascadeTopoTree                .findSubConferenceNode(conferenceID);                if (null == subConferenceNode)        {            logger.warn("this conferenceID is not in  CascadeTopoTree.");            return null;        }        //得到子会议的上级会议ID        SubConferenceNode parentConferenceNode = null;        parentConferenceNode = subConferenceNode.getParentConferenceNode();                //把自己添加到集合中        conferenceIdList.add(subConferenceNode.getConferenceID());                //循环取出子会议的上级会议        while (null != parentConferenceNode)        {            conferenceIdList.add(parentConferenceNode.getConferenceID());            parentConferenceNode = parentConferenceNode                    .getParentConferenceNode();                        if (null == parentConferenceNode)            {                break;            }        }        if (conferenceIdList.size() < 1)        {            logger.warn("ParentConferenID size is < 1");            return null;        }                if (logger.isDebugEnabled())        {            logger.debug("end to findParentNodeByConferenceID");        }                return conferenceIdList;    }

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