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

Introduction

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

Prototype

@GwtCompatible(serializable = true)
public static <E> ArrayList<E> newArrayListWithExpectedSize(int estimatedSize)

Source Link

Document

Creates an ArrayList instance to hold estimatedSize elements, plus an unspecified amount of padding; you almost certainly mean to call #newArrayListWithCapacity (see that method for further advice on usage).

Usage

From source file:org.apache.druid.query.metadata.metadata.ListColumnIncluderator.java

@Override
public byte[] getCacheKey() {
    int size = 1;
    List<byte[]> columns = Lists.newArrayListWithExpectedSize(this.columns.size());

    for (String column : this.columns) {
        final byte[] bytes = StringUtils.toUtf8(column);
        columns.add(bytes);/*from  ww  w . jav  a 2s .com*/
        size += bytes.length + 1;
    }

    final ByteBuffer bytes = ByteBuffer.allocate(size).put(LIST_CACHE_PREFIX);
    for (byte[] column : columns) {
        bytes.put(column);
        bytes.put((byte) 0xff);
    }

    return bytes.array();
}

From source file:co.cask.cdap.data2.dataset2.lib.table.SplitsUtil.java

/**
 * Simplest possible implementation of getSplits. Takes the given start and end and divides the key space in
 * between into (almost) even partitions, using a long integer approximation of the keys.
 *//*from  w ww  .  jav  a2  s  .c  o  m*/
static List<KeyRange> primitiveGetSplits(int numSplits, byte[] start, byte[] stop) {
    // if the range is empty, return no splits
    if (start != null && stop != null && Bytes.compareTo(start, stop) >= 0) {
        return Collections.emptyList();
    }
    if (numSplits <= 0) {
        numSplits = DEFAULT_NUMBER_OF_SPLITS;
    }
    // for simplicity, we construct a long from the begin and end, divide the resulting long range into approximately
    // even splits, and convert the boundaries back to nyte array keys.
    long begin = longForKey(start, false);
    long end = longForKey(stop, true);
    double splitSize = ((double) (end - begin)) / ((double) numSplits);

    // each range will start with the stop key of the previous range.
    // start key of the first range is either the given start, or the least possible key {0};
    List<KeyRange> ranges = Lists.newArrayListWithExpectedSize(numSplits);
    byte[] current = start == null ? new byte[] { 0x00 } : start;
    for (int i = 1; i < numSplits; i++) {
        long bound = begin + (long) (splitSize * i);
        byte[] next = keyForBound(bound);
        // due to rounding and truncation, we may get a bound that is the same as the previous (or if the previous is
        // the start key, less than that). We may also get a bound that exceeds the stop key. In both cases we want to
        // ignore this bound and continue.
        if (Bytes.compareTo(current, next) < 0 && (stop == null || Bytes.compareTo(next, stop) < 0)) {
            ranges.add(new KeyRange(current, next));
            current = next;
        }
    }
    // end of the last range is always the given stop of the range to cover
    ranges.add(new KeyRange(current, stop));

    return ranges;
}

From source file:com.tysanclan.site.projectewok.event.handlers.ResetGroupLeaderOnTermination.java

@Override
public EventResult onEvent(MembershipTerminatedEvent event) {
    User user = event.getSubject();/*from  www  .  jav a 2  s.co  m*/

    List<Group> leaderless = groupService.clearGroupLeaderStatus(user);

    List<Event<?>> events = Lists.newArrayListWithExpectedSize(leaderless.size());

    for (Group g : leaderless) {
        events.add(new GroupWithoutLeaderEvent(g));
    }

    return EventResult.ok(events);
}

From source file:org.apache.bookkeeper.clients.utils.NetUtils.java

/**
 * Get the list of endpoints from an endpoint string.
 *
 * @param endpointStr an endpoint string.
 * @return list of endpoints./* ww  w.  ja v  a2  s . c o m*/
 */
public static List<Endpoint> parseEndpoints(String endpointStr) {
    String[] endpointParts = StringUtils.split(endpointStr, ',');
    checkArgument(endpointParts.length > 0, "Invalid endpoint strings %s", endpointStr);
    List<Endpoint> endpoints = Lists.newArrayListWithExpectedSize(endpointParts.length);
    for (String endpointPart : endpointParts) {
        endpoints.add(parseEndpoint(endpointPart));
    }
    return endpoints;
}

From source file:com.yahoo.yqlplus.engine.internal.bytecode.types.gambit.BytecodeInvocable.java

@Override
public GambitCreator.Invocable prefix(List<BytecodeExpression> arguments) {
    if (arguments.isEmpty()) {
        return this;
    }//from www  . ja  v a 2  s .co  m
    Preconditions.checkState(arguments.size() <= argTypes.size(),
            "Invocable passed too many arguments to prefix");
    List<BytecodeExpression> prefixed = Lists.newArrayListWithExpectedSize(arguments.size());
    prefixed.addAll(arguments);
    return new PrefixedBytecodeInvocable(returnType, prefixed,
            argTypes.subList(prefixed.size(), argTypes.size()), this);
}

From source file:org.summer.dsl.xbase.typesystem.override.ParameterizedResolvedFeatures.java

protected List<JvmFeature> computeAllFeatures(List<JvmFeature> unfiltered) {
    List<JvmFeature> result = Lists.newArrayListWithExpectedSize(unfiltered.size());
    Multimap<String, AbstractResolvedOperation> processed = HashMultimap.create();
    computeAllFeatures(unfiltered, processed, result);
    return Collections.unmodifiableList(result);
}

From source file:ru.codeinside.gses.webui.declarant.ServiceQuery.java

@Override
public List<Item> loadItems(final int start, final int count) {
    final List<Item> items = Lists.newArrayListWithExpectedSize(services.size());
    List<Service> serviceList = showActive
            ? Flash.flash().getDeclarantService().selectActiveServices(type, start, count)
            : DeclarantUtils.sublist(services, start, count);
    for (Service s : serviceList) {
        final PropertysetItem item = new PropertysetItem();
        item.addItemProperty("id", new ObjectProperty<Long>(s.getId()));
        item.addItemProperty("name", new ObjectProperty<String>(s.getName()));
        items.add(item);//  w  w w . ja  v  a  2 s  .  c o  m
    }
    return items;
}

From source file:com.cloudera.exhibit.sql.ResultSetTable.java

public static RelProtoDataType fromMetadata(ResultSetMetaData metadata) throws SQLException {
    int cols = metadata.getColumnCount();
    List<String> names = Lists.newArrayListWithExpectedSize(cols);
    List<Class> javaTypes = Lists.newArrayListWithExpectedSize(cols);
    for (int i = 1; i <= cols; i++) {
        names.add(metadata.getColumnLabel(i));
        javaTypes.add(TypeUtils.getJavaClassForSQLType(metadata.getColumnType(i)));
    }//from w w  w .  j av a 2s  . c  om
    return new SQLTypeProtoDataType(names, javaTypes);
}

From source file:org.eclipse.xtext.validation.FeatureBasedDiagnostic.java

@Override
public List<?> getData() {
    List<Object> result = Lists.newArrayListWithExpectedSize(3);
    result.add(getSourceEObject());//ww w  . j  av  a  2s  .  c  o m
    if (feature != null) {
        result.add(feature);
        result.add(index);
    }
    if (getIssueData() != null) {
        result.add(getIssueData());
    }
    return result;
}

From source file:com.cloudera.science.ml.client.params.CentersParameters.java

public List<Centers> getCenters() throws IOException {
    List<MLCenters> centers = AvroIO.read(MLCenters.class, new File(centersFile));
    if (!centerIds.isEmpty()) {
        List<MLCenters> filter = Lists.newArrayListWithExpectedSize(centerIds.size());
        for (Integer centerId : centerIds) {
            filter.add(centers.get(centerId));
        }//from   w w w .j  a  v  a  2 s  .c om
        centers = filter;
    }
    return Lists.transform(centers, VectorConvert.TO_CENTERS);
}