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:br.com.autonomiccs.autonomic.plugin.common.services.AutonomiccsSystemVmDeploymentService.java

/**
 * This method looks for a random host in the given zone ( {@link DataCenterVO}) to deploy an Autonomiccs system VM.
 * It loads all pods ( {@link HostPodVO}) of the environment, and then it randomizes the list and tries to look for suitable hosts using {@link #searchForRandomHostInPodToDeployAutonomiccsSystemVm(HostPodVO)}
 *
 * @return {@link HostVO} to deploy the system VM, it can also return null if no suitable hosts were found.
 *//*from   ww w.j  ava  2  s  . co m*/
private HostVO searchForRandomHostInZoneToDeployAutonomiccsSystemVm(DataCenterVO dataCenterVO) {
    List<HostPodVO> allPodsEnabledFromZone = podService.getAllPodsEnabledFromZone(dataCenterVO.getId());
    Collections.shuffle(allPodsEnabledFromZone);
    for (HostPodVO hostPodVO : allPodsEnabledFromZone) {
        HostVO host = searchForRandomHostInPodToDeployAutonomiccsSystemVm(hostPodVO);
        if (host != null) {
            return host;
        }
    }
    logger.info(String.format(
            "Could not find any suitable hosts to deploy the system VM into zone [zoneId=%d, zoneName=%s]",
            dataCenterVO.getId(), dataCenterVO.getName()));
    return null;
}

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From source file:fr.ritaly.dungeonmaster.item.ItemManager.java

@Override
public Sector getRandomPlace() {
    if (items == null) {
        return null;
    }/*from  w w w. j  a  v  a 2s  . c  o  m*/

    final List<Sector> sectors = new ArrayList<Sector>(items.keySet());

    if (sectors.isEmpty()) {
        // Not supposed to happen
        return null;
    }

    Collections.shuffle(sectors);

    return sectors.iterator().next();
}

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

public List<AbstractMedia> forShuffleArtist(int mediaFileId, int count, String username,
        HttpServletRequest request) {/*  ww w  . j  a va 2s. c o m*/
    MediaFile artist = mediaFileService.getMediaFile(mediaFileId);
    List<MediaFile> songs = filterMusic(mediaFileService.getDescendantsOf(artist, false));
    Collections.shuffle(songs);
    songs = songs.subList(0, Math.min(count, songs.size()));
    return forMediaFiles(songs, username, request);
}

---

From source file:fr.fg.server.contract.NpcHelper.java

/**
 * Renvoie un prnom fminin alatoire.//from w  w w  .j  a v a 2 s. co  m
 * 
 * @return Un prnom fminin alatoire.
 */
public static String getRandomFemaleFirstName() {
    String value = femaleFirstNames.get(currentFemaleFirstName).getName();
    currentFemaleFirstName++;

    if (currentFemaleFirstName == femaleFirstNames.size()) {
        Collections.shuffle(femaleFirstNames);
        currentFemaleFirstName = 0;
    }

    return value;
}

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

@Test
public void testVelocity() {
    final Long constant = RandomUtils.nextLong();

    final List<Long> firsts = new ArrayList<Long>();
    final List<Long> thrus = new ArrayList<Long>();
    final Long f1 = System.currentTimeMillis();
    firsts.add(f1);/*from w w  w.j  a  v  a  2  s .c o m*/

    final Long base = f1 + RandomUtils.nextInt(1000) + 500;
    for (int ix = 0; ix < 4; ix++) {
        firsts.add(base + ix);
        thrus.add(base + ix);
    }
    Collections.shuffle(firsts);

    final String early = RandomStringUtils.randomAlphanumeric(8);
    final String late = RandomStringUtils.randomAlphanumeric(12);

    final List<String> bodies = new ArrayList<String>();
    final List<String> keys = new ArrayList<String>();
    final List<String> subs = new ArrayList<String>();
    for (int ix = 0; ix < firsts.size(); ix++) {
        if (firsts.get(ix).equals(f1)) {
            bodies.add(early);
        } else {
            bodies.add(late);
            subs.add(late);
            keys.add(firsts.get(ix).toString() + "&&" + constant);
        }
    }

    final TestSvc test = (TestSvc) context.getBean("testSvc");
    final StubReadThroughMultiCacheListenerImpl listener = (StubReadThroughMultiCacheListenerImpl) context
            .getBean("stubRTM");

    // This just primes the cache so we can ensure the sub-set feature works in the multi-cache example.
    test.getCompoundString(f1, early, constant);

    // Get the before count of objects that have been triggered, so we can isolate if the call triggers.
    final int previous = listener.getTriggers().size();

    final List<String> results = test.getCompoundStrings(firsts, late, constant);
    for (int ix = 0; ix < results.size(); ix++) {
        assertEquals(bodies.get(ix), results.get(ix));
    }

    // 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 = StubReadThroughMultiCacheListenerImpl.formatTriggers(TestDAOImpl.COMPOUND_NAMESPACE,
            TestDAOImpl.COMPOUND_PREFIX, keys, (List<Object>) (List) subs, // Using Erasure to satisfy the compiler. YUCK!
            null, new Object[] { thrus, late, constant });
    LOG.info("Expected = " + expected);
    assertEquals(expected, listener.getTriggers().get(listener.getTriggers().size() - 1));
}

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From source file:ml.dmlc.xgboost4j.java.XGBoost.java

private static List<Integer> genRandPermutationNums(int start, int end) {
    List<Integer> samples = new ArrayList<Integer>();
    for (int i = start; i < end; i++) {
        samples.add(i);//w  w w  .ja  va2s .  c o m
    }
    Collections.shuffle(samples);
    return samples;
}

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From source file:fr.fg.server.contract.NpcHelper.java

/**
 * Renvoie un nom de famille alatoire./*  w ww  . j  a  va  2 s  . c  o m*/
 * 
 * @return Un nom de famille alatoire.
 */
public static String getRandomLastName() {
    String value = lastNames.get(currentLastName).getName();
    currentLastName++;

    if (currentLastName == lastNames.size()) {
        Collections.shuffle(lastNames);
        currentLastName = 0;
    }

    return value;
}

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From source file:com.hackedcube.blenderopenmovies.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 % 4));
    }//from  ww w  .ja va 2  s .  com

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

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From source file:com.mgmtp.jfunk.data.generator.util.GeneratingExpression.java

/**
 * Replaces randomly selected characters in the given string with forbidden characters according
 * to the given expression.//from w  ww  .  ja v  a 2  s  .  co m
 * 
 * @param bad
 *            if bad = -2 all characters are replaced, if bad = -1 1 - (all - 1) are replaced,
 *            if bad > 0 the exact number of characters is replaced
 * @param input
 *            the input string
 * @return input with <code>bad</code> replaced characters
 */
public String negateString(final String input, int bad) {
    int length = input.length();
    Range[] ranges = getRanges();
    int[] lengths = new int[ranges.length];
    // arrange lengths
    for (int i = 0; i < lengths.length; i++) {
        Range r = ranges[i];
        lengths[i] = r.getMin();
        length -= r.getMin();
    }
    /**
     * distribute remaining lengths
     */
    int i = 0;
    // only 1000 tries otherwise break as it just does not work
    while (length > 0 && i < 1000) {
        int index = i % lengths.length;
        Range r = ranges[index];
        if (lengths[index] < r.getMax()) {
            lengths[index] += 1;
            length--;
        }
        i++;
    }

    // generate completely negative string
    String replaceString = generate(lengths, -2);
    if (replaceString.length() == 0) {
        log.warn("No negative characters possible in this expression. All characters are allowed.");
        return input;
    }
    // now replace the #bad character in the input string
    List<Integer> l = new ArrayList<Integer>(input.length());
    for (i = 0; i < input.length(); i++) {
        l.add(i);
    }
    if (bad == -2) {
        // all false
        bad = input.length();
    } else if (bad == -1) {
        bad = 1 + random.getInt(input.length() - 1);
    }
    Collections.shuffle(l);
    StringBuffer base = new StringBuffer(input);
    int j = 0;
    for (i = 0; i < bad; i++) {
        int index = l.remove(0);
        char replaceChar = ' ';
        if (index < replaceString.length()) {
            replaceChar = replaceString.charAt(index);
        }
        while ((index == 0 || index >= replaceString.length() || index == input.length() - 1)
                && Character.isSpaceChar(replaceChar)) {
            replaceChar = replaceString.charAt(j);
            j = (j + 1) % replaceString.length();
        }
        base.setCharAt(index, replaceChar);
    }
    if (log.isDebugEnabled()) {
        log.debug("False characters in string; " + input + " became " + base);
    }
    return base.toString();
}

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