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:graph.module.cli.ManualDisjointnessCommand.java

@Override
protected void executeImpl() {
    if (data.isEmpty()) {
        printErrorNoData();//from  w  w  w . jav  a2s. c o m
        return;
    }

    // If file, load the file, iterate through it, and output to file.
    ArrayList<String> split = UtilityMethods.split(data, ' ');
    DirectedAcyclicGraph dag = ((DAGPortHandler) handler).getDAG();
    try {
        OUTPUT_FILE.createNewFile();
        BufferedWriter out = new BufferedWriter(new FileWriter(OUTPUT_FILE));
        if (split.size() == 1) {
            File file = new File(split.get(0));
            if (!file.exists()) {
                print("-1|Cannot find file.\n");
                out.close();
                return;
            }
            BufferedReader in = new BufferedReader(new FileReader(file));

            String input = null;
            ArrayList<String> inputs = new ArrayList<>();
            while ((input = in.readLine()) != null) {
                if (!input.startsWith("@")) {
                    inputs.add(input);
                } else {
                    out.write(input + "\n");
                }
            }
            in.close();

            // Shuffle and process
            Collections.shuffle(inputs);
            int i = 1;
            for (String line : inputs) {
                String[] elements = line.split(",");
                if (!printResult(elements[0], elements[1], dag, out, i++, inputs.size()))
                    break;
            }
        } else if (split.size() == 2) {
            // If inputs, process, and output to file.
            printResult(split.get(0), split.get(1), dag, out, 1, 1);
        }
        out.close();
    } catch (Exception e) {
        print("-1|Exception!\n");
        return;
    }
}

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From source file:defaultmethods.StandardDeck.java

public void shuffle() {
    Collections.shuffle(entireDeck);
}

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From source file:com.tealcube.minecraft.bukkit.mythicdrops.utils.SocketGemUtil.java

public static SocketGem getRandomSocketGemWithChance() {
    Map<String, SocketGem> socketGemMap = MythicDropsPlugin.getInstance().getSockettingSettings()
            .getSocketGemMap();/*from   w w  w.  j  ava2  s  .  c o m*/
    if (socketGemMap == null || socketGemMap.isEmpty()) {
        return null;
    }
    double totalWeight = 0;
    for (SocketGem sg : socketGemMap.values()) {
        totalWeight += sg.getChance();
    }

    double chosenWeight = MythicDropsPlugin.getInstance().getRandom().nextDouble() * totalWeight;

    double currentWeight = 0;

    List<SocketGem> l = new ArrayList<>(socketGemMap.values());
    Collections.shuffle(l);

    for (SocketGem sg : socketGemMap.values()) {
        currentWeight += sg.getChance();

        if (currentWeight >= chosenWeight) {
            return sg;
        }
    }
    return null;
}

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From source file:com.naver.jr.study.bo.sesame.SesameBOImpl.java

@Override
public List<SesameStep> getMainThemeList() {
    List<SesameStep> sesameStepList = sesameDAO.selectMainThemeList();
    Collections.shuffle(sesameStepList);

    if (CollectionUtils.isNotEmpty(sesameStepList) && sesameStepList.size() >= 3) {
        sesameStepList = sesameStepList.subList(0, 3);
    }/*from  w ww  .j a va 2  s  . c o  m*/

    return sesameStepList;
}

---

From source file:com.stratio.decision.unit.engine.validator.BaseRegularExpressionValidatorTest.java

private List<StratioStreamingMessage> getMixedMessages() {
    List<String> allStrings = Arrays.asList(ArrayUtils.addAll(getGoodStrings(), getBadStrings()));
    Collections.shuffle(allStrings);
    return getMessages((String[]) allStrings.toArray());
}

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From source file:com.benfante.minimark.blo.AssessmentFillingBo.java

@Transactional
public AssessmentFilling generateAssessmentFilling(Assessment assessment) {
    AssessmentFilling assessmentFilling = new AssessmentFilling();
    assessmentFilling.setAssessment(assessment);
    int i = 0;/*from   w  ww.  j  ava 2  s. c  o m*/
    for (AssessmentQuestion assessmentQuestion : assessment.getQuestions()) {
        QuestionFilling questionFilling = buildQuestionFilling(assessmentQuestion.getQuestion());
        questionFilling.setOrdering(Long.valueOf(i++));
        questionFilling.setAssessmentFilling(assessmentFilling);
        assessmentFilling.getQuestions().add(questionFilling);
    }
    if (assessment.getShuffleQuestions() != null && assessment.getShuffleQuestions().booleanValue()) {
        Collections.shuffle(assessmentFilling.getQuestions());
        i = 0;
        for (QuestionFilling questionFilling : assessmentFilling.getQuestions()) {
            questionFilling.setOrdering(Long.valueOf(i++));
        }
    }
    return assessmentFilling;
}

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

@Test
public void test() {
    final Long rawNow = System.currentTimeMillis();
    final Long now = (rawNow / 1000) * 10000;
    final List<Long> subset = new ArrayList<Long>();
    final List<Long> complement = new ArrayList<Long>();
    final List<Long> superset = new ArrayList<Long>();
    final List<Long> jumbleset = new ArrayList<Long>();
    final List<String> complementResult = new ArrayList<String>(complement.size());

    for (Long ix = 1 + now; ix < 35 + now; ix++) {
        if (ix % 3 == 0) {
            subset.add(ix);//from www .  ja  va2s  .c o m
        } else {
            complement.add(ix);
            complementResult.add(null);
        }
        superset.add(ix);
        jumbleset.add(ix);
    }
    Collections.shuffle(jumbleset);

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

    // Get all the results for the subset ids.
    // Ensure the ids line up with the results, and have the same timestamp.
    final List<String> subsetResult = test.getTimestampValues(subset);
    assertEquals(subset.size(), subsetResult.size());
    String subsetTime = null;
    for (int ix = 0; ix < subset.size(); ix++) {
        final Long key = subset.get(ix);
        final String value = subsetResult.get(ix);
        LOG.info("Subset: " + value);
        final String[] parts = value.split("-X-");
        if (subsetTime == null) {
            subsetTime = parts[0];
        } else {
            assertEquals(subsetTime, parts[0]);
        }
        assertEquals(key.toString(), parts[1]);
    }

    // Now call the full list.
    // Ensure id's line up, and that results from ids that got passed in the subset
    // have the older time stamp.
    final int previous = listener.getTriggers().size();
    final List<String> supersetResult = test.getTimestampValues(superset);

    assertEquals(superset.size(), supersetResult.size());
    String supersetTime = null;
    for (int ix = 0; ix < superset.size(); ix++) {
        final Long key = superset.get(ix);
        final String value = supersetResult.get(ix);
        LOG.info("Superset: " + value);
        final String[] parts = value.split("-X-");
        final boolean inSubset = subset.contains(key);
        if (!inSubset && supersetTime == null) {
            supersetTime = parts[0];
        } else if (inSubset) {
            assertEquals(subsetTime, parts[0]);
        } else {
            assertEquals(supersetTime, parts[0]);
        }
        assertEquals(key.toString(), parts[1]);

        if (!inSubset) {
            int index = complement.indexOf(key);
            complementResult.set(index, value);
        }
    }

    // Testing that the listener got invoked as required.
    assertTrue("Doesn't look like the listener got called.", listener.getTriggers().size() == previous + 1);

    // Now call for the results again, but with a randomized
    // set of keys.  This is to ensure the proper values line up with
    // the given keys.
    final List<String> jumblesetResult = test.getTimestampValues(jumbleset);
    assertEquals(jumbleset.size(), jumblesetResult.size());
    for (int ix = 0; ix < jumbleset.size(); ix++) {
        final Long key = jumbleset.get(ix);
        final String value = jumblesetResult.get(ix);
        LOG.info("Jumbleset: " + value);
        final String[] parts = value.split("-X-");
        final boolean inSubset = subset.contains(key);
        if (inSubset) {
            assertEquals(subsetTime, parts[0]);
        } else {
            assertEquals(supersetTime, parts[0]);
        }
        assertEquals(key.toString(), parts[1]);
    }

}

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From source file:hsyndicate.hadoop.utils.HSyndicateConfigUtils.java

private static String pickClosestUGHostWithPort(Configuration conf) {
    String[] UGHostsWithPort = listSyndicateUGHosts(conf);
    if (UGHostsWithPort == null || UGHostsWithPort.length == 0) {
        // error/*from ww w. j a va 2 s .c  om*/
        return null;
    }

    String selectedAddr = IPUtils.selectLocalIPAddress(UGHostsWithPort);
    if (selectedAddr != null && !selectedAddr.isEmpty()) {
        return selectedAddr;
    }

    // pick random
    List<String> contactPoints = new ArrayList<String>();
    for (String host : UGHostsWithPort) {
        contactPoints.add(host);
    }

    Collections.shuffle(contactPoints);
    return contactPoints.get(0);
}

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From source file:com.addthis.hydra.task.stream.TestStreamSourceMeshy.java

@Test
public void testStreamSourcesSort() {
    final StreamSourceMeshy source = new StreamSourceMeshy();
    final int numElements = 100000;

    FileReference[] fileRefs = new FileReference[numElements];
    List<MeshyStreamFile> streamFiles = new ArrayList<>(numElements);
    DateTime date = DateTime.now();//ww  w  .j  a va 2s .  c om

    try {
        for (int i = 0; i < numElements; i++) {
            fileRefs[i] = new FileReference("", 0, i);
            Field f = fileRefs[i].getClass().getDeclaredField("hostUUID");
            f.setAccessible(true);
            String uuid = RandomStringUtils.randomAlphabetic(20);
            f.set(fileRefs[i], uuid);
            streamFiles.add(new MeshyStreamFile(source, date, fileRefs[i]));
        }
    } catch (Exception ex) {
        ex.printStackTrace();
        fail();
    }

    Collections.shuffle(streamFiles);

    Collections.sort(streamFiles, new Comparator<MeshyStreamFile>() {
        @Override
        public int compare(MeshyStreamFile streamFile1, MeshyStreamFile streamFile2) {
            return source.compareStreamFiles(streamFile1, streamFile2);
        }
    });

}

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From source file:net.sf.jtmt.clustering.DocumentCollection.java

/**
 * Shuffle.
 */
public void shuffle() {
    Collections.shuffle(documentNames);
}

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