Example usage for org.apache.commons.collections.iterators LoopingIterator LoopingIterator

Introduction

In this page you can find the example usage for org.apache.commons.collections.iterators LoopingIterator LoopingIterator.

Prototype

public LoopingIterator(Collection coll) 

Source Link

Document

Constructor that wraps a collection.

Usage

From source file:com.pureinfo.tgirls.servlet.GetPicArrServlet.java

@Override
protected void doGet(HttpServletRequest _req, HttpServletResponse _resp) throws ServletException, IOException {
    String type = _req.getParameter("pictype");
    String s = _req.getParameter("size");
    String sstartIndex = _req.getParameter("startIndex");

    if (StringUtils.isEmpty(s)) {
        s = "50";
    }//from w  w w.j  a  v  a2s  . co  m
    if (StringUtils.isEmpty(sstartIndex)) {
        sstartIndex = "0";
    }

    int startIndex = Integer.parseInt(sstartIndex);
    int resultsize = Integer.parseInt(s);

    logger.debug("to get pics with type:" + type + " and size:" + resultsize);

    _resp.setContentType("text/json; charset=utf-8");
    JsonBase json = new JsonBase();

    //List<Photo> result = new ArrayList<Photo>();
    List<Photo> cacheList = null;

    if ((cacheList = (List<Photo>) cache.get("pics." + type)) == null) {
        try {

            startIndex = 0;

            IPhotoMgr mgr = (IPhotoMgr) ArkContentHelper.getContentMgrOf(Photo.class);
            if (StringUtils.isEmpty(type)) {
                cacheList = mgr.getRandomPics(500);
            } else {
                cacheList = mgr.getRandomPics(Integer.parseInt(type), 500);
            }
            if (cacheList != null) {
                cache.put("pics." + type, cacheList);
            }

        } catch (PureException e) {
            logger.error("error when get pics.", e);
        }
    }

    if (cacheList == null || cacheList.isEmpty()) {
        json.setErrorCode(ErrorCode.ERROR.getCode());
        json.setErrorMsg("");
        _resp.getWriter().write(json.toString());
        return;
    }

    //Collections.shuffle(cacheList);
    //result.addAll(cacheList);

    //if (resultsize < result.size()) {
    //    result.subList(0, resultsize);
    //}

    try {
        Photo photo;
        List<JSONObject> jsonList = new ArrayList<JSONObject>();

        int temp = 0;
        int i = 0;
        if (startIndex == 0) {
            startIndex = new Random().nextInt(cacheList.size());
        }
        Iterator<Photo> itor = new LoopingIterator(cacheList);
        while (itor.hasNext() && i < resultsize) {
            photo = itor.next();
            if (temp < startIndex) {
                logger.debug("currentIndex[" + temp + "] and startIndex[" + startIndex + "]");
                temp++;
                continue;
            }

            logger.debug("to add photo[" + photo + "]");
            jsonList.add(new JSONObject(photo));
            i++;
        }
        Collections.shuffle(jsonList);
        json.put("pics", jsonList);
        json.put("nextIndex", startIndex + resultsize);
    } catch (JSONException e) {
        throw new RuntimeException();
    }

    // logger.debug("result:" + json.toString());

    _resp.getWriter().write(json.toString());
    return;

}

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