Example usage for java.util Collections shuffle

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:com.eightmins.eightminutes.MainFragment.java

private void loadRows() {
    List<Movie> list = MovieList.setupMovies();

    mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    CardPresenter cardPresenter = new CardPresenter();

    int i;/*  w w w  . j  av a  2s .com*/
    for (i = 0; i < MainFragment.NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(cardPresenter);
        for (int j = 0; j < MainFragment.NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }
        HeaderItem header = new HeaderItem(i, MovieList.MOVIE_CATEGORY[i]);
        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

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

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

    setAdapter(mRowsAdapter);

}

---

From source file:com.example.hp.smartstor.CloudMusicManager.uamp.model.MusicProvider.java

/**
 * Get an iterator over a shuffled collection of all songs
 *//* w w  w.  ja va  2  s  .co m*/
public Iterable<MediaMetadataCompat> getShuffledMusic() {
    if (mCurrentState != State.INITIALIZED) {
        return Collections.emptyList();
    }
    List<MediaMetadataCompat> shuffled = new ArrayList<>(mMusicListById.size());
    for (com.example.hp.smartstor.CloudMusicManager.uamp.model.MutableMediaMetadata mutableMetadata : mMusicListById
            .values()) {
        shuffled.add(mutableMetadata.metadata);
    }
    Collections.shuffle(shuffled);
    return shuffled;
}

---

From source file:com.androidtv_test.view.main.MainFragment.java

private void loadRows() {
    List<Movie> list = MovieList.setupMovies();

    //?//  w  w  w.j a  va  2 s  .  co m
    mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    CardPresenter cardPresenter = new CardPresenter();//?

    int i;
    for (i = 0; i < NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);//
        }
        //??
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(cardPresenter);
        for (int j = 0; j < NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }

        HeaderItem header = new HeaderItem(i, MovieList.MOVIE_CATEGORY[i]);

        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

    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));
    mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));

    setAdapter(mRowsAdapter);

}

---

From source file:android.test.com.quxuetv.ibrowse.test.MainFragment.java

private void loadRows() {
    List<Movie> list = MovieList.setupMovies();

    //  mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
    mRowsAdapter = new ArrayObjectAdapter(new CustomListRowPresenter());
    CardPresenter cardPresenter = new CardPresenter();

    int i;/* w ww. java 2  s .  co  m*/
    for (i = 0; i < NUM_ROWS; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(cardPresenter);
        for (int j = 0; j < NUM_COLS; j++) {
            listRowAdapter.add(list.get(j % 5));
        }
        MyHeaderItem header = new MyHeaderItem(i, MovieList.MOVIE_CATEGORY[i], R.drawable.ic_add_white_48dp);
        CustomListRow mClr = new CustomListRow(header, listRowAdapter);
        mClr.setmNums(1);
        mRowsAdapter.add(mClr);
    }

    // HeaderItem gridHeader = new HeaderItem(i, "PREFERENCES");
    MyHeaderItem gridHeader = new MyHeaderItem(i, "PREFERENCES", R.drawable.ic_add_white_48dp);

    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));
    mRowsAdapter.add(new CustomListRow(gridHeader, gridRowAdapter));

    setAdapter(mRowsAdapter);

}

---

From source file:de.unisb.cs.st.javalanche.mutation.run.task.MutationTaskCreator.java

/**
 * Generates given number of mutation task, where each task consists of a
 * given number of mutations. Note: The MutationProperties.PROJECT_PREFIX
 * variable has to be set.//from  ww w. j  ava 2s  .  c om
 * 
 * @param numberOfTasks
 *            number of tasks that should be created
 * @param mutationsPerTask
 *            number of mutations per task
 * @throws IOException
 */
public static void createMutationTasks(int numberOfTasks, int mutationsPerTask) throws IOException {
    String prefix = ConfigurationLocator.getJavalancheConfiguration().getProjectPrefix();
    int numberOfIds = numberOfTasks * mutationsPerTask;
    List<Long> mutationIds = getMutations(prefix, numberOfIds);
    Collections.shuffle(mutationIds);
    int i = 1;
    for (; i <= numberOfTasks; i++) {
        List<Long> idsForTask = new ArrayList<Long>();
        if (mutationIds.size() >= mutationsPerTask) {
            idsForTask.addAll(mutationIds.subList(0, mutationsPerTask));
        } else {
            logger.info("Not enough mutations fetched from db");
            idsForTask.addAll(mutationIds);
        }
        mutationIds.removeAll(idsForTask);
        if (idsForTask.size() > 0) {
            writeListToFile(idsForTask, i, numberOfTasks);
        } else {
            logger.info("No more mutations. Finishing after file " + (i - 1));

            break;
        }
    }
    i = i - 1;
    System.out.println("Created " + i + " mutation tasks");
}

---

From source file:eu.eubrazilcc.lvl.core.GbSeqXmlFileTest.java

@Test
public void test() {
    System.out.println("GbSeqXmlFileTest.test()");
    try {/*w  w w .jav a2  s.c o m*/
        File output = null;
        String payload = null;

        // test writing individual FASTA files (uncompressed)
        final Collection<File> files = getGBSeqXMLFiles();
        for (final File file : files) {
            System.out.println(" >> Sequence file: " + file.getCanonicalPath());
            output = new File(TEST_OUTPUT_DIR, "sequence.fasta");
            toFasta(file, output.getCanonicalPath(), false);
            assertThat("fasta sequence file exists: " + output.getCanonicalPath(), output.canRead(),
                    equalTo(true));
            payload = readFileToString(output);
            assertThat("fasta sequence is not null", payload, notNullValue());
            assertThat("fasta sequence is not empty", isNotBlank(payload), equalTo(true));
            /* uncomment for additional output */
            System.out.println(" >> FASTA sequence \n" + payload);
        }

        // test writing a single FASTA file (uncompressed)
        output = new File(TEST_OUTPUT_DIR, "sequences.fasta");
        toFasta(files, output.getCanonicalPath(), false);
        assertThat("fasta sequences file exists: " + output.getCanonicalPath(), output.canRead(),
                equalTo(true));
        payload = readFileToString(output);
        assertThat("fasta sequences is not null", payload, notNullValue());
        assertThat("fasta sequences is not empty", isNotBlank(payload), equalTo(true));
        /* uncomment for additional output */
        System.out.println(" >> FASTA sequences \n" + payload);

        // test writing a FASTA file (compressed)
        final List<File> list = newArrayList(files);
        Collections.shuffle(list);
        final File file = list.get(0);
        output = new File(TEST_OUTPUT_DIR, "sequence.fasta.gz");
        toFasta(file, output.getCanonicalPath(), false);
        assertThat("fasta GZIP compressed file exists: " + output.getCanonicalPath(), output.canRead(),
                equalTo(true));
        assertThat("fasta GZIP compressed file is not empty", output.length() > 0l, equalTo(true));

    } catch (Exception e) {
        e.printStackTrace(System.err);
        fail("GbSeqXmlFileTest.test() failed: " + e.getMessage());
    } finally {
        System.out.println("GbSeqXmlFileTest.test() has finished");
    }
}

---

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";
    }/*ww w  . java2  s. c om*/
    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;

}

---

From source file:com.kaltura.playkit.samples.androidtv.MainFragment.java

private void loadRows() {
    List<Movie> list = MainActivity.list;

    CardPresenter cardPresenter = new CardPresenter();

    int i;//w  w  w.  j a  v  a2 s  .com
    for (i = 0; i < MOVIE_CATEGORY.length; i++) {
        if (i != 0) {
            Collections.shuffle(list);
        }
        ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(cardPresenter);
        for (int j = 0; j < list.size(); j++) {
            listRowAdapter.add(list.get(j % (list.size())));
        }
        HeaderItem header = new HeaderItem(i, MOVIE_CATEGORY[i]);
        mRowsAdapter.add(new ListRow(header, listRowAdapter));
    }

    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));
    mRowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));
}

---

From source file:mobi.designmyapp.template.sample.upvprod.task.PoiProxyRequestTask.java

/**
 * Retrieves the PoiProxy data and processes mapping of the JSON response to a PoiProxyResult POJO
 * @param url should contain the url call to PoiProxy services
 * @return/*from   ww  w  .  j  a  va 2 s .c  o  m*/
 */
@Override
protected PoiProxyResult doInBackground(URI... url) {
    PoiProxyResult result = null;

    HttpClient client = new DefaultHttpClient();

    //For each URI provided, we call and get the result
    for (URI callURI : url) {
        // Process http request
        try {
            HttpGet request = new HttpGet(callURI);
            HttpResponse response = client.execute(request);

            StatusLine statusLine = response.getStatusLine();

            // If request has returned correctly, process JSON
            if (statusLine.getStatusCode() == HttpStatus.SC_OK) {

                InputStream resultStream = response.getEntity().getContent();

                ObjectMapper mapper = new ObjectMapper();
                mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
                mapper.configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES, false);

                // If first call, the result is the object
                if (result == null)
                    result = mapper.readValue(resultStream, PoiProxyResult.class);
                // Otherwise, add the results to the previous result
                else
                    result.getFeatures()
                            .addAll(mapper.readValue(resultStream, PoiProxyResult.class).getFeatures());

                resultStream.close();

            } else {
                //Closes the connection.
                response.getEntity().getContent().close();
                throw new IOException(statusLine.getReasonPhrase());
            }
        } catch (IOException e) {
            Log.e(TAG, "Error while retrieving POI Proxy query: " + callURI + " data:" + e);
        }
    }
    if (result != null)
        Collections.shuffle(result.getFeatures());
    return result;
}

---

From source file:com.linkedin.pinot.tools.query.comparison.StarTreeQueryGenerator.java

/**
 * Randomly generate the WHERE clause of the query, may return empty string
 * @return// w ww.j  a v a 2s.co  m
 */
private String generatePredicates() {
    int numDimensions = _dimensionColumns.size();
    int numPredicates = _random.nextInt(numDimensions + 1);
    numPredicates = Math.min(numPredicates, MAX_NUM_PREDICATES);
    if (numPredicates == 0) {
        return EMPTY_STRING;
    }

    List<String> predicates = new ArrayList<>(numPredicates);
    Collections.shuffle(_dimensionColumns);
    for (int i = 0; i < numPredicates; i++) {
        predicates.add(generatePredicate(_dimensionColumns.get(i)));
    }

    return WHERE + " " + StringUtils.join(predicates, " AND ");
}

---

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