Example usage for java.util Collections shuffle

List of usage examples for java.util Collections shuffle

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Introduction

In this page you can find the example usage for java.util Collections shuffle.

Prototype

public static void shuffle(List<?> list)

Source Link

Document

Randomly permutes the specified list using a default source of randomness.

Usage

From source file:net.sourceforge.subsonic.service.sonos.SonosHelper.java

public List<AbstractMedia> forShuffleAlbumList(AlbumListType albumListType, int count, String username,
        HttpServletRequest request) {//from ww  w. j ava 2  s  . c o  m
    AlbumList albumList = createAlbumList(albumListType, 0, 40, username);

    List<MediaFile> songs = new ArrayList<MediaFile>();
    for (MediaFile album : albumList.getAlbums()) {
        songs.addAll(filterMusic(mediaFileService.getChildrenOf(album, true, false, false)));
    }
    Collections.shuffle(songs);
    songs = songs.subList(0, Math.min(count, songs.size()));
    return forMediaFiles(songs, username, request);
}

From source file:ch.gianulli.flashcards.SessionFragment.java

private void fetchCards() {
    if (mCardsLoader != null) {
        mCardsLoader.cancel(true);// w  w  w  .  ja v a 2 s .  c o m
        mCardsLoader = null;
    }

    mCardsLoader = new AsyncTask<Void, Void, Boolean>() {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            setActivePage(Page.PROGRESS);
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            try {
                mList = TrelloList.getList(mTrelloApi, null, mListId);

                if (mList != null) {

                    // Select cards
                    mCards = mList.getCards();

                    int mode = getArguments().getInt(KEY_MODE);
                    int n = getArguments().getInt(KEY_NBR_OF_CARDS);
                    if (mode == SessionActivity.MODE_AT_RANDOM) {
                        mCards = new ArrayList<>(mCards); // cards in list stay untouched
                        Collections.shuffle(mCards);
                        mCards = new ArrayList<>(mCards.subList(0, Math.min(n, mCards.size())));
                    } else if (mode == SessionActivity.MODE_FROM_TOP) {
                        mCards = new ArrayList<>(mCards.subList(0, Math.min(n, mCards.size())));
                    } else if (mode == SessionActivity.MODE_FROM_BOTTOM) {
                        mCards = new ArrayList<>(mCards.subList(Math.max(0, mCards.size() - n), mCards.size()));
                        Collections.reverse(mCards);
                    }

                    return true;
                } else {
                    throw new TrelloNotAccessibleException("Result was null.");
                }
            } catch (TrelloNotAuthorizedException e) {
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mTrelloApi.requestAuthorization(getActivity().getSupportFragmentManager());
                    }
                });
            } catch (TrelloNotAccessibleException e) {
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        setActivePage(Page.NO_CONNECTION);
                    }
                });
                Log.d("test", "Trello not accessible: " + e.getMessage());
            }

            return false;
        }

        @Override
        protected void onPostExecute(Boolean success) {
            if (success) {
                mAdapter.setCards(mCards);
                setActivePage(Page.SESSION_VIEW);

                mViewPager.setCurrentItem(0);

                // Update page indicator
                mPageIndicator.setText(getResources().getString(R.string.page_indicator_text,
                        mViewPager.getCurrentItem() + 1, mAdapter.getCount()));
            }
        }
    }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}

From source file:com.example.anthony.bigscreenforreddit.MainFragment.java

private void loadRows() {

    /*mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
            // ww w.j a  va2s  .  c  o  m
    */
    /* GridItemPresenter *//*
                           HeaderItem gridItemPresenterHeader = new HeaderItem(0, "GridItemPresenter");
                                   
                           GridItemPresenter mGridPresenter = new GridItemPresenter();
                           ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(mGridPresenter);
                           gridRowAdapter.add("ITEM 1");
                           gridRowAdapter.add("ITEM 2");
                           gridRowAdapter.add("ITEM 3");
                           mRowsAdapter.add(new ListRow(gridItemPresenterHeader, gridRowAdapter));
                                   
                           *//* CardPresenter *//*
                                                 HeaderItem cardPresenterHeader = new HeaderItem(1, "CardPresenter");
                                                 CardPresenter cardPresenter = new CardPresenter();
                                                 ArrayObjectAdapter cardRowAdapter = new ArrayObjectAdapter(cardPresenter);
                                                         
                                                 for(int i=0; i<10; i++) {
                                                 Movie movie = new Movie();
                                                 if(i%3 == 0) {
                                                 movie.setCardImageUrl("http://heimkehrend.raindrop.jp/kl-hacker/wp-content/uploads/2014/08/DSC02580.jpg");
                                                 } else if (i%3 == 1) {
                                                 movie.setCardImageUrl("http://heimkehrend.raindrop.jp/kl-hacker/wp-content/uploads/2014/08/DSC02630.jpg");
                                                 } else {
                                                 movie.setCardImageUrl("http://heimkehrend.raindrop.jp/kl-hacker/wp-content/uploads/2014/08/DSC02529.jpg");
                                                 }
                                                 movie.setTitle("title" + i);
                                                 movie.setStudio("studio" + i);
                                                 cardRowAdapter.add(movie);
                                                         
                                                 mRowsAdapter.add(new ListRow(cardPresenterHeader, cardRowAdapter));
                                                         
                                                 *//* Set *//*
                                                             setAdapter(mRowsAdapter); }*/

    //List<PostInfo> list = PostList.setupReddit();
    List<RedditObject> list = RedditObjectWrapper.class;
    mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    mCardPresenter = new CardPresenter();

    int i;
    for (i = 0; i < NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(mCardPresenter);
        for (int j = 0; j < NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }
        //            HeaderItem header = new HeaderItem(i, MovieList.MOVIE_CATEGORY[i], null);
        HeaderItem header = new HeaderItem(i, Constants.Reddit.DEFAULT_SUBREDDITS[i]);
        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

    //        HeaderItem gridHeader = new HeaderItem(i, "PREFERENCES", null);
    HeaderItem gridHeader = new HeaderItem(i, "PREFERENCES");

    GridItemPresenter mGridPresenter = new GridItemPresenter();
    ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(mGridPresenter);
    gridRowAdapter.add(getResources().getString(R.string.grid_view));
    gridRowAdapter.add(getString(R.string.error_fragment));
    gridRowAdapter.add(getResources().getString(R.string.personal_settings));
    gridRowAdapter.add(getString(R.string.Login));
    mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));

    setAdapter(mRowsAdapter);

}

From source file:ga.rugal.jpt.common.tracker.server.TrackedTorrent.java

/**
 * Get a list of peers we can return in an announce response for this
 * torrent.//from   w w  w. j  a va  2s  . c o  m
 *
 * @param peer The peer making the request, so we can exclude it from the
 *             list of returned peers.
 *
 * @return A list of peers we can include in an announce response.
 */
public List<Peer> getSomePeers(TrackedPeer peer) {
    List<Peer> peers = new LinkedList<>();

    List<TrackedPeer> candidates;
    candidates = new LinkedList<>(this.peers.values());
    Collections.shuffle(candidates);

    int count = 0;
    for (TrackedPeer candidate : candidates) {
        // Collect unfresh peers, and obviously don't serve them as well.
        if (!candidate.isFresh() || (candidate.looksLike(peer) && !candidate.equals(peer))) {
            LOG.debug(CommonLogContent.STALE_PEERS, candidate);
            this.peers.remove(candidate.getHexPeerId());
            continue;
        }
        // Don't include the requesting peer in the answer.
        if (peer.looksLike(candidate)) {
            continue;
        }
        // Collect unfresh peers, and obviously don't serve them as well.
        if (!candidate.isFresh()) {
            LOG.debug(CommonLogContent.STALE_PEERS, candidate.getHexPeerId());
            this.peers.remove(candidate.getHexPeerId());
            continue;
        }
        // Only serve at most ANSWER_NUM_PEERS peers
        if (count++ > this.answerPeers) {
            break;
        }
        peers.add(candidate);
    }
    return peers;
}

From source file:edu.umd.cs.guitar.runner.GuitarController.java

/**
 * Replays top k generated test cases.// ww  w  . ja v  a  2 s.c om
 *
 * @param k number of test case to replay.
 * @param randomized <code>true</code> if replay in a random order
 */
public void replayTopTests(int k, boolean randomized) {
    System.out.println("===========================");
    System.out.println("START REPLAYING....");
    System.out.println("===========================");

    File testcaseDir = new File(testCaseDir);
    File[] testcases = testcaseDir.listFiles();

    if (randomized) {
        Collections.shuffle(Arrays.asList(testcases));
    }
    for (int i = 0; i < k && i < testcases.length; i++) {

        File testcase = testcases[i];
        String testcasePath = testcase.getAbsolutePath();
        replaySingleTestCase(testcasePath);
    }

    System.out.println("===========================");
    System.out.println("DONE REPLAYING!!!");
    System.out.println("===========================");
}

From source file:edu.txstate.dmlab.clusteringwiki.web.RegisterController.java

@RequestMapping("captcha.*")
public void getCaptcha(HttpServletRequest request, HttpServletResponse response, Model model) {

    //prepare vars
    HttpSession session = request.getSession();

    String action = request.getParameter("action");
    if (action == null) {
        sendOutput(response, "Error: invalid action received.");
        return;//w ww.  j a va  2s .c om
    }

    if (action.equals("verify")) {
        String captcha = request.getParameter("captcha");
        String answer = (String) session.getAttribute("captchaAnswer");
        if (captcha == null || captcha.length() < 10 || answer == null) {
            sendOutput(response, "Error: invalid verify request received.");
            return;
        }
        if (captcha.substring(10).equals(answer)) {
            sendOutput(response, "{\"status\":\"success\"}");
            return;
        } else {
            sendOutput(response, "{\"status\":\"error\"}");
            return;
        }
    }

    // tops: star: 120, heart: 0; bwm: 56; diamond: 185

    List<Integer> topPositions = new ArrayList<Integer>(4);
    topPositions.add(120);
    topPositions.add(0);
    topPositions.add(56);
    topPositions.add(185);

    //randomize images
    Collections.shuffle(topPositions);

    //generate new codes
    Random r = new Random();
    List<String> codes = new ArrayList<String>(4);
    codes.add(Long.toString(Math.abs(r.nextLong()), 36));
    codes.add(Long.toString(Math.abs(r.nextLong()), 36));
    codes.add(Long.toString(Math.abs(r.nextLong()), 36));
    codes.add(Long.toString(Math.abs(r.nextLong()), 36));

    //pick a random item to check against - between 0 and 4
    int chosen = r.nextInt(4);

    //create the html code
    String template = "<div class=\"captchaWrapper\" id=\"captchaWrapper\">"
            + "   <a href=\"#\" class=\"captchaRefresh\"></a>"
            + "   <div id=\"draggable_{c0}\" class=\"draggable\" "
            + "      style=\"left: 15px; background-position: -{t0}px -3px\"></div>"
            + "   <a href=\"#\" class=\"captchaRefresh\"></a>"
            + "   <div id=\"draggable_{c1}\" class=\"draggable\" "
            + "      style=\"left: 83px; background-position: -{t1}px -3px;\"></div>"
            + "   <a href=\"#\" class=\"captchaRefresh\"></a>"
            + "   <div id=\"draggable_{c2}\" class=\"draggable\" "
            + "      style=\"left: 151px; background-position: -{t2}px -3px;\"></div>"
            + "   <a href=\"#\" class=\"captchaRefresh\"></a>"
            + "   <div id=\"draggable_{c3}\" class=\"draggable\" "
            + "      style=\"left: 219px; background-position: -{t3}px -3px;\"></div>"
            + "   <div class=\"targetWrapper\">"
            + "      <div class=\"target\" style=\"background-position: -{t4}px -66px;\"></div>" + "   </div>"
            + "   <input type=\"hidden\" class=\"captchaAnswer\" name=\"captcha\" value=\"\" />" + "</div>";

    template = template.replace("{c0}", codes.get(0)).replace("{c1}", codes.get(1))
            .replace("{c2}", codes.get(2)).replace("{c3}", codes.get(3))
            .replace("{t0}", String.valueOf(topPositions.get(0)))
            .replace("{t1}", String.valueOf(topPositions.get(1)))
            .replace("{t2}", String.valueOf(topPositions.get(2)))
            .replace("{t3}", String.valueOf(topPositions.get(3)));
    // the chosen image
    template = template.replace("{t4}", String.valueOf(topPositions.get(chosen)));

    //store the chosen code in the session
    session.setAttribute("captchaAnswer", codes.get(chosen));

    //display captcha
    sendOutput(response, template);

}

From source file:com.gs.collections.impl.parallel.SerialParallelPerformanceTest.java

private MutableList<Function0<Iterable<Integer>>> getIntegerListGenerators(int count) {
    Interval interval = Interval.fromTo(-(count / 2), count / 2 - 1);
    MutableList<Function0<Iterable<Integer>>> generators = FastList.newList();
    generators.add(() -> {//from   www.  j  a v a  2s. c  o m
        MutableList<Integer> integers = interval.toList();
        Collections.shuffle(integers);
        return integers;
    });
    generators.add(() -> {
        MutableList<Integer> integers = interval.toList();
        Collections.shuffle(integers);
        return integers.toImmutable();
    });
    generators.add(interval::toSet);
    Collections.shuffle(generators);
    return generators;
}

From source file:com.digitalpebble.stormcrawler.elasticsearch.persistence.CollapsingSpout.java

@Override
public void onResponse(SearchResponse response) {
    long timeTaken = System.currentTimeMillis() - timeStartESQuery;

    SearchHit[] hits = response.getHits().getHits();
    int numBuckets = hits.length;

    // no more results?
    if (numBuckets == 0) {
        lastDate = null;/*from   w w w.j a v a2 s  .co m*/
        lastStartOffset = 0;
    }
    // still got some results but paging won't help
    else if (numBuckets < maxBucketNum) {
        lastStartOffset = 0;
    } else {
        lastStartOffset += numBuckets;
    }

    // reset the value for next fetch date if the previous one is too old
    if (resetFetchDateAfterNSecs != -1) {
        Calendar diffCal = Calendar.getInstance();
        diffCal.setTime(lastDate);
        diffCal.add(Calendar.SECOND, resetFetchDateAfterNSecs);
        // compare to now
        if (diffCal.before(Calendar.getInstance())) {
            LOG.info("{} lastDate set to null based on resetFetchDateAfterNSecs {}", logIdprefix,
                    resetFetchDateAfterNSecs);
            lastDate = null;
            lastStartOffset = 0;
        }
    }

    int alreadyprocessed = 0;
    int numDocs = 0;

    synchronized (buffer) {
        for (SearchHit hit : hits) {
            Map<String, SearchHits> innerHits = hit.getInnerHits();
            // wanted just one per bucket : no inner hits
            if (innerHits == null) {
                numDocs++;
                if (!addHitToBuffer(hit)) {
                    alreadyprocessed++;
                }
                continue;
            }
            // more than one per bucket
            SearchHits inMyBucket = innerHits.get("urls_per_bucket");
            for (SearchHit subHit : inMyBucket.hits()) {
                numDocs++;
                if (!addHitToBuffer(subHit)) {
                    alreadyprocessed++;
                }
            }
        }

        // Shuffle the URLs so that we don't get blocks of URLs from the
        // same host or domain
        if (numBuckets != numDocs) {
            Collections.shuffle((List) buffer);
        }
    }

    esQueryTimes.addMeasurement(timeTaken);
    // could be derived from the count of query times above
    eventCounter.scope("ES_queries").incrBy(1);
    eventCounter.scope("ES_docs").incrBy(numDocs);
    eventCounter.scope("already_being_processed").incrBy(alreadyprocessed);

    LOG.info("{} ES query returned {} hits from {} buckets in {} msec with {} already being processed",
            logIdprefix, numDocs, numBuckets, timeTaken, alreadyprocessed);

    // remove lock
    isInESQuery.set(false);
}

From source file:org.flite.cach3.test.UpdateMultiCacheTest.java

@Test
public void testVelocity() {

    final String original = RandomStringUtils.randomAlphanumeric(7);
    final Long second = Long.valueOf("1337" + RandomStringUtils.randomNumeric(5));
    final List<Long> firsts = new ArrayList<Long>();
    final List<String> baseIds = new ArrayList<String>();
    final long base = RandomUtils.nextInt(2000) + 1000;
    for (int ix = 0; ix < 3; ix++) {
        final Long val = base + ix;
        firsts.add(val);
        baseIds.add(val + "&&" + second);
    }//from  w  w  w  .  ja va 2 s  .  c om
    final Long extra = base + 10;
    final String extraString = original + extra.toString();

    final TestSvc test = (TestSvc) context.getBean("testSvc");
    final StubUpdateMultiCacheListenerImpl listener = (StubUpdateMultiCacheListenerImpl) context
            .getBean("stubUM");

    final int previous = listener.getTriggers().size();
    final List<String> results = test.updateCompoundStrings(second, original, firsts);

    // Testing that the listener got invoked as required.
    assertTrue("Doesn't look like the listener got called.", listener.getTriggers().size() == previous + 1);
    final String expected = StubUpdateMultiCacheListenerImpl.formatTriggers(TestDAOImpl.COMPOUND_NAMESPACE,
            TestDAOImpl.COMPOUND_PREFIX, baseIds, (List<Object>) (List) results, // Using Erasure to satisfy the compiler. YUCK!
            results, new Object[] { second, original, firsts });
    assertEquals(expected, listener.getTriggers().get(listener.getTriggers().size() - 1));

    // This part just double-checks the sublist aspect of the ReadThroughMultiCache
    firsts.add(extra);
    Collections.shuffle(firsts);
    final List<String> r2 = test.getCompoundStrings(firsts, extraString, second);
    for (int ix = 0; ix < firsts.size(); ix++) {
        final Long value = firsts.get(ix);
        assertEquals(value.equals(extra) ? extraString : original, r2.get(ix));
    }
}

From source file:android.math.practice.VideoDetailsFragment.java

private void setupMovieListRow() {
    String subcategories[] = { getString(R.string.related_movies) };
    List<Movie> list = MovieList.list;

    Collections.shuffle(list);
    ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(new CardPresenter());
    for (int j = 0; j < NUM_COLS; j++) {
        listRowAdapter.add(list.get(j % 5));
    }// w w w  .  java  2s  . c  om

    HeaderItem header = new HeaderItem(0, subcategories[0]);
    mAdapter.add(new ListRow(header, listRowAdapter));
}