私有方法十

/**
     * @author : lKF35745
     * @version: 1.0
     * <p>时间 : 2011-1-18</p>
     * <p>描述 : 获取SrcScreen的所有父节点会议ID（包括自己）</p>
     * <p>Copyright 1988-2005, Huawei Tech. Co., Ltd.</p>
     * @param DstSrceen 会议集合列表
     * @return List<String> srcScreen会议集合列表
     */
    private List<String> getSrcScreenParentConferID(
            List<String> dstScreenParentConferID, CascadeTopoTree cascadeTree,
            String srcScreenConferenceID, VideoSelectionParam videoParas)
    {
        if (logger.isDebugEnabled())
        {
            logger.debug("begin to getSrcScreenParentConferID and param is "
                    + dstScreenParentConferID.size() + " and Value is "
                    + dstScreenParentConferID.toString());
        }
        if (null == dstScreenParentConferID
                || dstScreenParentConferID.size() < 1)
        {
            logger.warn("this params is null or empty");
            return null;
        }
        
        //记录SrcScreen的会议ID
        List<String> srcScreenAllConferID = new ArrayList<String>();
        if (logger.isDebugEnabled())
        {
            logger.debug("Params srcScreenConferenceID Value is "
                    + srcScreenConferenceID);
        }
        //先把SrcScreen的会议ID添加至srcScreenAllNode中
        srcScreenAllConferID.add(srcScreenConferenceID);
        //SrcScreen的会议ID是否存在DstScreen会议中
        while (!dstScreenParentConferID.contains(srcScreenConferenceID))
        {
            //得到SrcScreen的父会议ID
            srcScreenConferenceID = findParentConferenceID(
                    srcScreenConferenceID, cascadeTree);
            if (null == srcScreenConferenceID)
            {
                break;
            }
            //把被视频源的父会议ID添加至srcScreenAllNode集合
            srcScreenAllConferID.add(srcScreenConferenceID);
        }
        //设置SrcScreen和DstScreen的交集值
        videoParas.setIntersectionValue(srcScreenConferenceID);
        
        if (srcScreenAllConferID.size() < 1)
        {
            logger.warn("this get SrcScreen ConferenceID is empty");
            return null;
        }
        
        return srcScreenAllConferID;
    }