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:org.apache.fluo.recipes.core.export.ExportObserverImpl.java

@Override
public void process(TransactionBase tx, Bytes row, Column col) throws Exception {
    ExportBucket bucket = new ExportBucket(tx, row);

    Bytes continueRow = bucket.getContinueRow();

    Iterator<ExportEntry> input = bucket.getExportIterator(continueRow);
    MemLimitIterator memLimitIter = new MemLimitIterator(input, memLimit, 8 + queueId.length());

    Iterator<SequencedExport<K, V>> exportIterator = Iterators.transform(memLimitIter,
            ee -> new SequencedExport<>(serializer.deserialize(ee.key, keyType),
                    serializer.deserialize(ee.value, valType), ee.seq));

    exportIterator = Iterators.consumingIterator(exportIterator);

    exporter.export(exportIterator);// w  ww . j  a  va 2s . co  m

    if (input.hasNext() || continueRow != null) {
        // not everything was processed so notify self OR new data may have been inserted above the
        // continue row
        bucket.notifyExportObserver();
    }

    if (input.hasNext()) {
        if (!memLimitIter.hasNext()) {
            // stopped because of mem limit... set continue key
            bucket.setContinueRow(input.next());
            continueRow = null;
        }
    }

    if (continueRow != null) {
        bucket.clearContinueRow();
    }
}

From source file:org.hashtrees.manager.HashTreesManagerObserverNotifier.java

private void notifyObservers(Function<HashTreesManagerObserver, Void> function) {
    Iterator<Void> itr = Iterators.transform(observers.iterator(), function);
    while (itr.hasNext())
        itr.next();//from w  ww.  ja  v  a  2s  .  co  m
}

From source file:org.apache.drill.exec.store.sys.ProfileInfoIterator.java

/**
 * Iterating persistentStore as a iterator of {@link org.apache.drill.exec.store.sys.ProfileInfoIterator.ProfileInfo}.
 *//*from   w w  w .  j  a  va 2  s.co  m*/
private Iterator<ProfileInfo> transform(Iterator<Entry<String, UserBitShared.QueryProfile>> all) {
    return Iterators.transform(all, new Function<Entry<String, UserBitShared.QueryProfile>, ProfileInfo>() {
        @Nullable
        @Override
        public ProfileInfo apply(@Nullable Entry<String, UserBitShared.QueryProfile> input) {
            if (input == null || input.getValue() == null) {
                return ProfileInfo.getDefault();
            }

            //Constructing ProfileInfo
            final String queryID = input.getKey();
            final QueryProfile profile = input.getValue();
            //For cases where query was never queued
            final long assumedQueueEndTime = profile.getQueueWaitEnd() > 0 ? profile.getQueueWaitEnd()
                    : profile.getPlanEnd();
            return new ProfileInfo(queryID, new Timestamp(profile.getStart()),
                    profile.getForeman().getAddress(), profile.getTotalFragments(), profile.getUser(),
                    profile.getQueueName(), computeDuration(profile.getStart(), profile.getPlanEnd()),
                    computeDuration(profile.getPlanEnd(), assumedQueueEndTime),
                    computeDuration(assumedQueueEndTime, profile.getEnd()), profile.getState().name(),
                    profile.getQuery());
        }
    });
}

From source file:net.myrrix.online.candidate.ExampleCandidateFilter.java

@Override
public Collection<Iterator<FastByIDMap.MapEntry<float[]>>> getCandidateIterator(float[][] userVectors) {
    Lock readLock = lock.readLock();
    readLock.lock();/*  w w w .java 2s. c o  m*/
    try {
        return Collections
                .singleton(Iterators.transform(someCurrentIDs.iterator(), new RetrieveEntryFunction()));
    } finally {
        readLock.unlock();
    }
}

From source file:com.comphenix.protocol.wrappers.nbt.ConvertedCollection.java

@Override
public Iterator<VOuter> iterator() {
    return Iterators.transform(inner.iterator(), getOuterConverter());
}

From source file:org.fcrepo.kernel.rdf.impl.FixityRdfContext.java

/**
 * Ordinary constructor.//from www  . j av a 2s .co  m
 *
 * @param node
 * @param graphSubjects
 * @param blobs
 * @throws RepositoryException
 */
public FixityRdfContext(final Node node, final IdentifierTranslator graphSubjects,
        final Iterable<FixityResult> blobs) throws RepositoryException {
    super(node, graphSubjects);

    concat(Iterators
            .concat(Iterators.transform(blobs.iterator(), new Function<FixityResult, Iterator<Triple>>() {

                @Override
                public Iterator<Triple> apply(final FixityResult blob) {
                    final com.hp.hpl.jena.graph.Node resultSubject = getTransientFixitySubject();
                    final ImmutableSet.Builder<Triple> b = builder();
                    try {
                        b.add(create(resultSubject, RDF.type.asNode(), FIXITY_TYPE.asNode()));
                        b.add(create(graphSubjects.getSubject(node.getPath()).asNode(),
                                HAS_FIXITY_RESULT.asNode(), resultSubject));
                        final String storeIdentifier = blob.getStoreIdentifier();
                        final com.hp.hpl.jena.graph.Node contentLocation = createResource(storeIdentifier)
                                .asNode();
                        b.add(create(resultSubject, HAS_CONTENT_LOCATION.asNode(), contentLocation));
                        b.add(create(contentLocation, RDF.type.asNode(), CONTENT_LOCATION_TYPE.asNode()));
                        b.add(create(contentLocation, HAS_CONTENT_LOCATION_VALUE.asNode(),
                                createLiteral(storeIdentifier)));

                        for (final FixityResult.FixityState state : blob.getStatus()) {
                            b.add(create(resultSubject, HAS_FIXITY_STATE.asNode(),
                                    createLiteral(state.toString())));
                        }
                        final String checksum = blob.getComputedChecksum().toString();
                        b.add(create(resultSubject, HAS_MESSAGE_DIGEST.asNode(), createURI(checksum)));
                        b.add(create(resultSubject, HAS_SIZE.asNode(),
                                createTypedLiteral(blob.getComputedSize()).asNode()));
                        return b.build().iterator();
                    } catch (final RepositoryException e) {
                        throw propagate(e);
                    }
                }
            })));
}

From source file:org.grouplens.lenskit.util.table.RowImpl.java

@Override
public Iterator<Object> iterator() {
    return Iterators.transform(layout.getColumns().iterator(), VALUE_FUNCTION);
}

From source file:de.cosmocode.palava.workqueue.ConfigurableDelayQueue.java

@Override
public Iterator<E> iterator() {
    return Iterators.transform(queue.iterator(), extractor);
}

From source file:io.druid.java.util.common.guava.FunctionalIterator.java

public <RetType> FunctionalIterator<RetType> keep(Function<T, RetType> fn) {
    return new FunctionalIterator<>(Iterators.filter(Iterators.transform(delegate, fn), Predicates.notNull()));
}

From source file:net.automatalib.commons.smartcollections.AbstractSmartCollection.java

@Override
public Iterator<E> iterator() {
    return Iterators.transform(referenceIterator(), this::get);
}