Example usage for com.google.common.collect Iterators transform

Introduction

In this page you can find the example usage for com.google.common.collect Iterators transform.

Prototype

public static <F, T> Iterator<T> transform(final Iterator<F> fromIterator,
        final Function<? super F, ? extends T> function)

Source Link

Document

Returns an iterator that applies function to each element of fromIterator .

Usage

From source file:com.anhth12.lambda.serving.ModelManagerListener.java

@Override
public void contextInitialized(ServletContextEvent sce) {
    log.info("ModelManagerListener initializing");
    ServletContext context = sce.getServletContext();

    init(context);//w w  w  .j a  v  a2  s.c  o m

    inputProducer = new TopicProducerImpl<>(inputTopicBroker, inputTopic);

    context.setAttribute(INPUT_PRODUCER_KEY, inputProducer);

    Properties consumerProps = new Properties();
    consumerProps.setProperty("group.id", "LAMBDA-SPEEDLAYER-" + System.currentTimeMillis());
    consumerProps.setProperty("zookeeper.connect", updateTopicLockMaster);

    consumerProps.setProperty("auto.offset.reset", "smallest");
    ConsumerConfig consumerConfig = new ConsumerConfig(consumerProps);

    consumer = Consumer.createJavaConsumerConnector(consumerConfig);
    KafkaStream<String, U> stream = consumer.createMessageStreams(Collections.singletonMap(updateTopic, 1),
            new StringDecoder(null), loadDecoderInstance()).get(updateTopic).get(0);

    final Iterator<KeyMessage<String, U>> transformed = Iterators.transform(stream.iterator(),
            new Function<MessageAndMetadata<String, U>, KeyMessage<String, U>>() {

                @Override
                public KeyMessage<String, U> apply(MessageAndMetadata<String, U> input) {
                    return new KeyMessageImpl<>(input.key(), input.message());
                }

            });
    modelManager = loadManagerInstance();

    new Thread(new LoggingRunnable() {

        @Override
        public void doRun() throws Exception {
            modelManager.consume(transformed);
        }
    });

    context.setAttribute(MANAGER_KEY, modelManager);

}

From source file:org.apache.druid.timeline.VersionedIntervalTimeline.java

public static void addSegments(VersionedIntervalTimeline<String, DataSegment> timeline,
        Iterator<DataSegment> segments) {
    timeline.addAll(Iterators.transform(segments, segment -> segment.getShardSpec().createChunk(segment)),
            DataSegment::getInterval, DataSegment::getVersion);
}

From source file:org.javersion.util.AbstractTreeMap.java

public Iterator<Map.Entry<K, V>> iterator(boolean asc) {
    return Iterators.transform(doIterator(root(), true), MapUtils.<K, V>mapEntryFunction());
}

From source file:qdg.ListUGraph.java

@Override
public Iterator<Edge> getUEdgeIterator() {
    return Iterators.transform(uEdgeLace.getArcIterator(), constructEdge);
}

From source file:qdg.ListDiGraph.java

@Override
public Iterator<Edge> getArcIterator() {
    return Iterators.transform(arcLace.getArcIterator(), constructEdge);
}

From source file:org.apache.jackrabbit.oak.jcr.delegate.AuthorizableDelegator.java

@Override
public Iterator<Group> declaredMemberOf() throws RepositoryException {
    return sessionDelegate.perform(new SessionOperation<Iterator<Group>>("declaredMemberOf") {
        @Nonnull//from  w  w w.j av  a 2s  . c o m
        @Override
        public Iterator<Group> perform() throws RepositoryException {
            Iterator<Group> groups = delegate.declaredMemberOf();
            return Iterators.transform(groups, new Function<Group, Group>() {
                @Nullable
                @Override
                public Group apply(@Nullable Group group) {
                    return GroupDelegator.wrap(sessionDelegate, group);
                }
            });
        }
    });
}

From source file:com.pipeline.collections.queue.ContainerBackedDeque.java

@Override
public Iterator<T> descendingIterator() {
    return Iterators.transform(keys.descendingIterator(), loader);
}

From source file:qdg.StaticDiGraph.java

@Override
public Iterator<Edge> getArcIterator() {
    return Iterators.transform(new IndexIterator<EdgeData>(arcs), constructEdge);
}

From source file:qdg.StaticUGraph.java

@Override
public Iterator<Edge> getUEdgeIterator() {
    return Iterators.transform(new IndexIterator<EdgeData>(uEdges), constructEdge);
}

From source file:com.palantir.atlasdb.keyvalue.impl.RowResults.java

public static Iterator<RowResult<byte[]>> filterDeletedColumnsAndEmptyRows(
        final Iterator<RowResult<byte[]>> it) {
    Iterator<RowResult<byte[]>> purgeDeleted = Iterators.transform(it,
            createFilterColumnValues(Predicates.not(Value.IS_EMPTY)));
    return Iterators.filter(purgeDeleted, Predicates.not(RowResults.<byte[]>createIsEmptyPredicate()));
}