Example usage for com.google.common.collect Lists newArrayListWithCapacity

List of usage examples for com.google.common.collect Lists newArrayListWithCapacity

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Introduction

In this page you can find the example usage for com.google.common.collect Lists newArrayListWithCapacity.

Prototype

@GwtCompatible(serializable = true)
public static <E> ArrayList<E> newArrayListWithCapacity(int initialArraySize)

Source Link

Document

Creates an ArrayList instance backed by an array with the specified initial size; simply delegates to ArrayList#ArrayList(int) .

Usage

From source file:com.google.gerrit.server.change.ReviewerJson.java

public List<ReviewerInfo> format(Collection<ReviewerResource> rsrcs) throws OrmException {
    List<ReviewerInfo> infos = Lists.newArrayListWithCapacity(rsrcs.size());
    AccountInfo.Loader loader = accountLoaderFactory.create(true);
    for (ReviewerResource rsrc : rsrcs) {
        ReviewerInfo info = format(rsrc, null);
        loader.put(info);/*from   w  w w . j av  a  2s. c  o  m*/
        infos.add(info);
    }
    loader.fill();
    return infos;
}

From source file:org.plista.kornakapi.core.recommender.ArrayTopItems.java

public static List<RecommendedItem> getTopItems(int howMany, long[] possibleItemIDs, int fromIndex, int toIndex,
        IDRescorer rescorer, TopItems.Estimator<Long> estimator) throws TasteException {

    Preconditions.checkArgument(possibleItemIDs != null, "possibleItemIDs is null");
    Preconditions.checkArgument(estimator != null, "estimator is null");

    Queue<RecommendedItem> topItems = new PriorityQueue<RecommendedItem>(howMany + 1,
            Collections.reverseOrder(ByValueRecommendedItemComparator.getInstance()));
    boolean full = false;
    double lowestTopValue = Double.NEGATIVE_INFINITY;
    for (int index = fromIndex; index < toIndex; index++) {
        long itemID = possibleItemIDs[index];
        if (rescorer == null || !rescorer.isFiltered(itemID)) {
            double preference;
            try {
                preference = estimator.estimate(itemID);
            } catch (NoSuchItemException nsie) {
                continue;
            } catch (NoSuchUserException nsue) {
                continue;
            }/*from  w ww . j av a  2s.  c  o  m*/
            double rescoredPref = rescorer == null ? preference : rescorer.rescore(itemID, preference);
            if (!Double.isNaN(rescoredPref) && (!full || rescoredPref > lowestTopValue)) {
                topItems.add(new GenericRecommendedItem(itemID, (float) rescoredPref));
                if (full) {
                    topItems.poll();
                } else if (topItems.size() > howMany) {
                    full = true;
                    topItems.poll();
                }
                lowestTopValue = topItems.peek().getValue();
            }
        }
    }
    int size = topItems.size();
    if (size == 0) {
        return Collections.emptyList();
    }
    List<RecommendedItem> result = Lists.newArrayListWithCapacity(size);
    result.addAll(topItems);
    Collections.sort(result, ByValueRecommendedItemComparator.getInstance());
    return result;
}

From source file:monasca.api.infrastructure.persistence.hibernate.AlarmHibernateUtils.java

public List<String> findAlarmIds(String tenantId, Map<String, String> dimensions) {
    logger.trace(BaseSqlRepo.ORM_LOG_MARKER, "findAlarmIds(...) entering");
    List<String> alarmIdList = null;

    StatelessSession session = null;//from  w  w w.ja va2s .  c  o m
    try {
        session = sessionFactory.openStatelessSession();

        final String sql = this.findAlarmQueryString(dimensions);
        final Query query = session.createSQLQuery(sql).setString("tenantId", tenantId);

        this.bindDimensionsToQuery(query, dimensions);

        @SuppressWarnings("unchecked")
        List<Object[]> rows = query.list();
        alarmIdList = Lists.newArrayListWithCapacity(rows.size());
        for (Object[] row : rows) {
            String id = (String) row[0];
            alarmIdList.add(id);
        }

    } finally {
        if (session != null) {
            session.close();
        }
    }

    // no need to check if alarmIdList != null, because in case of exception method
    // will leave immediately, otherwise list wont be null.
    return alarmIdList;
}

From source file:com.google.dart.compiler.ast.NodeList.java

@Override
public E set(int index, E element) {
    if (elements == null) {
        elements = Lists.newArrayListWithCapacity(index + 1);
    }/*from w w w . java  2 s.  co m*/
    E result = elements.set(index, element);
    owner.becomeParentOf(element);
    return result;
}

From source file:com.isotrol.impe3.core.component.CookieExtractors.java

/**
 * Performs an extraction./*from   ww w  .  j ava 2s. com*/
 * @param target Target object.
 * @return Actions to register.
 */
public final List<NewCookie> extract(Object target) {
    if (isEmpty()) {
        return ImmutableList.of();
    }
    final List<NewCookie> actions = Lists.newArrayListWithCapacity(extractors.size());
    for (CookieExtractor e : extractors) {
        final NewCookie cookie = e.extract(target);
        if (cookie != null) {
            actions.add(cookie);
        }
    }
    return actions;
}

From source file:org.apache.mahout.ga.watchmaker.cd.CDCrossover.java

@Override
protected List<CDRule> mate(CDRule parent1, CDRule parent2, int numberOfCrossoverPoints, Random rng) {
    Preconditions.checkArgument(parent1.getNbConditions() == parent2.getNbConditions(),
            "Cannot perform cross-over with parents of different size.");
    CDRule offspring1 = new CDRule(parent1);
    CDRule offspring2 = new CDRule(parent2);
    // Apply as many cross-overs as required.
    for (int i = 0; i < numberOfCrossoverPoints; i++) {
        // Cross-over index is always greater than zero and less than
        // the length of the parent so that we always pick a point that
        // will result in a meaningful cross-over.
        int crossoverIndex = 1 + rng.nextInt(parent1.getNbConditions() - 1);
        for (int j = 0; j < crossoverIndex; j++) {
            swap(offspring1, offspring2, j);
        }//from  w  w  w.jav a 2  s .com
    }

    List<CDRule> result = Lists.newArrayListWithCapacity(2);
    result.add(offspring1);
    result.add(offspring2);
    return result;
}

From source file:com.isotrol.impe3.core.component.ActionExtractors.java

/**
 * Performs an extraction.//from w  ww. j  a v a2 s .co  m
 * @param target Target object.
 * @return Actions to register.
 */
public final List<Action> extract(Object target) {
    if (isEmpty()) {
        return ImmutableList.of();
    }
    final List<Action> actions = Lists.newArrayListWithCapacity(extractors.size());
    for (ActionExtractor e : extractors) {
        final Action action = e.extract(target);
        if (action != null) {
            actions.add(action);
        }
    }
    return actions;
}

From source file:com.pinterest.terrapin.controller.FileSetStatusServlet.java

/**
 * Get all missing partitions/*from   w  w w .  ja  va2 s . c  o m*/
 * @param zkManager ZookeeperManager instance
 * @param fileSetInfo file set information
 * @return list of missing partitions
 */
public static List<Integer> getMissingPartitions(ZooKeeperManager zkManager, FileSetInfo fileSetInfo) {
    if (fileSetInfo.servingInfo == null) {
        return Lists.newArrayListWithCapacity(0);
    }
    ViewInfo viewInfo = zkManager.getViewInfo(fileSetInfo.servingInfo.helixResource);
    if (viewInfo == null) {
        return Lists.newArrayListWithCapacity(0);
    }
    List<Integer> missingPartitions = new ArrayList<Integer>();
    for (int i = 0; i < fileSetInfo.servingInfo.numPartitions; i++) {
        String partitionName = TerrapinUtil.getViewPartitionName(fileSetInfo.servingInfo.helixResource, i);
        if (!viewInfo.isOnlinePartition(partitionName)) {
            missingPartitions.add(i);
        }
    }
    return missingPartitions;
}

From source file:org.apache.mahout.cf.taste.hadoop.RecommendedItemsWritable.java

@Override
public void readFields(DataInput in) throws IOException {
    int size = in.readInt();
    recommended = Lists.newArrayListWithCapacity(size);
    for (int i = 0; i < size; i++) {
        long itemID = Varint.readSignedVarLong(in);
        float value = in.readFloat();
        RecommendedItem recommendedItem = new GenericRecommendedItem(itemID, value);
        recommended.add(recommendedItem);
    }/*from   w w w  .j  a v a 2  s  . c o m*/
}

From source file:cpw.mods.fml.common.network.ModMissingPacket.java

@Override
public FMLPacket consumePacket(byte[] data) {
    ByteArrayDataInput dat = ByteStreams.newDataInput(data);
    int missingLen = dat.readInt();
    missing = Lists.newArrayListWithCapacity(missingLen);
    for (int i = 0; i < missingLen; i++) {
        ModData md = new ModData();
        md.modId = dat.readUTF();/*from   w w  w  .jav  a  2 s  . c o  m*/
        md.modVersion = dat.readUTF();
        missing.add(md);
    }
    int badVerLength = dat.readInt();
    badVersion = Lists.newArrayListWithCapacity(badVerLength);
    for (int i = 0; i < badVerLength; i++) {
        ModData md = new ModData();
        md.modId = dat.readUTF();
        md.modVersion = dat.readUTF();
        badVersion.add(md);
    }
    return this;
}