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

Introduction

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

Prototype

public static <T> Iterator<T> concat(final Iterator<? extends Iterator<? extends T>> inputs)

Source Link

Document

Combines multiple iterators into a single iterator.

Usage

From source file:org.apache.crunch.impl.mem.CountersWrapper.java

@Override
public Iterator<CounterGroup> iterator() {
    return Iterators.concat(Iterables.transform(allCounters, new Function<Counters, Iterator<CounterGroup>>() {
        @Override// ww w . jav a 2  s .c o  m
        public Iterator<CounterGroup> apply(Counters input) {
            return input.iterator();
        }
    }).iterator());
}

From source file:org.optaplanner.core.impl.domain.valuerange.buildin.composite.CompositeCountableValueRange.java

@Override
public Iterator<T> createOriginalIterator() {
    List<Iterator<T>> iteratorList = new ArrayList<Iterator<T>>(childValueRangeList.size());
    for (CountableValueRange<T> childValueRange : childValueRangeList) {
        iteratorList.add(childValueRange.createOriginalIterator());
    }// w  w  w.j a v a 2  s .com
    return Iterators.concat(iteratorList.iterator());
}

From source file:org.fcrepo.kernel.modeshape.rdf.impl.VersionsRdfContext.java

@SuppressWarnings("unchecked")
private Iterator<Triple> versionTriples() throws RepositoryException {
    final Iterator<Version> allVersions = versionHistory.getAllVersions();
    return Iterators.concat(Iterators.transform(allVersions, version2triples::apply));
}

From source file:org.jclouds.collect.PagedIterable.java

/**
 * Combines all the pages into a single unmodifiable iterable. ex.
 * //from  w  w  w .  j a  v a2  s  . c o m
 * <pre>
 * FluentIterable<StorageMetadata> blobs = blobstore.list(...).concat();
 * for (StorageMetadata blob : blobs) {
 *     process(blob);
 * }
 * </pre>
 * 
 * @see Iterators#concat
 */
public FluentIterable<E> concat() {
    final Iterator<IterableWithMarker<E>> iterator = iterator();
    final UnmodifiableIterator<Iterator<E>> unmodifiable = new UnmodifiableIterator<Iterator<E>>() {
        @Override
        public boolean hasNext() {
            return iterator.hasNext();
        }

        @Override
        public Iterator<E> next() {
            return iterator.next().iterator();
        }
    };
    return new FluentIterable<E>() {
        @Override
        public Iterator<E> iterator() {
            return Iterators.concat(unmodifiable);
        }
    };
}

From source file:org.sonar.javascript.model.implementations.expression.ObjectLiteralTreeImpl.java

@Override
public Iterator<Tree> childrenIterator() {
    return Iterators.concat(properties.iterator());
}

From source file:com.eucalyptus.reporting.export.ReportingExport.java

private <T> Iterator<T> iterateAll(Iterable<Iterable<T>> data) {
    List<Iterator<T>> iterators = Lists.newArrayList();
    for (final Iterable<T> iterable : data) {
        iterators.add(iterable.iterator());
    }/*w  ww.ja v  a 2s  .  co  m*/
    return Iterators.unmodifiableIterator(Iterators.concat(iterators.iterator()));
}

From source file:org.sonar.javascript.model.implementations.declaration.ArrayBindingPatternTreeImpl.java

@Override
public Iterator<Tree> childrenIterator() {
    List<Tree> nonElidedElements = Lists.newArrayList();
    for (Optional<BindingElementTree> e : elements) {
        if (e.isPresent()) {
            nonElidedElements.add(e.get());
        }/*from   ww  w.ja v  a  2s .  com*/
    }
    return Iterators.concat(nonElidedElements.iterator());
}

From source file:org.apache.kylin.storage.gtrecord.StorageResponseGTScatter.java

@Override
public Iterator<GTRecord> iterator() {
    Iterator<PartitionResultIterator> iterators = Iterators.transform(blocks,
            new Function<byte[], PartitionResultIterator>() {
                public PartitionResultIterator apply(byte[] input) {
                    return new PartitionResultIterator(input, info, columns);
                }/*from   w w  w.j a  v a  2  s .  c  o m*/
            });

    if (!needSorted) {
        logger.debug("Using Iterators.concat to pipeline partition results");
        return Iterators.concat(iterators);
    }

    List<PartitionResultIterator> partitionResults = Lists.newArrayList(iterators);
    if (partitionResults.size() == 1) {
        return partitionResults.get(0);
    }
    logger.debug("Using SortMergedPartitionResultIterator to merge {} partition results",
            partitionResults.size());
    return new SortMergedPartitionResultIterator(partitionResults, info, GTRecord.getComparator(groupByDims));
}

From source file:org.eclipse.sirius.ext.base.collect.MultipleCollection.java

/**
 * /*from  w w w .j av a  2s.  c  om*/
 * {@inheritDoc}
 */
public Iterator<E> iterator() {
    if (sets.size() > 0) {
        final List<Iterator<? extends E>> iterators = new ArrayList<Iterator<? extends E>>();
        for (final Collection<? extends E> col : sets) {
            iterators.add(col.iterator());
        }
        return Iterators.concat(iterators.iterator());
    } else {
        return new ArrayList().iterator();
    }
}

From source file:org.apache.jackrabbit.oak.spi.security.principal.CompositePrincipalProvider.java

@Nonnull
@Override/*from www .j av a  2s  . c o m*/
public Iterator<Principal> findPrincipals(@Nullable String nameHint, int searchType) {
    Iterator<? extends Principal>[] iterators = new Iterator[providers.size()];
    int i = 0;
    for (PrincipalProvider provider : providers) {
        if (nameHint == null) {
            iterators[i++] = provider.findPrincipals(searchType);
        } else {
            iterators[i++] = provider.findPrincipals(nameHint, searchType);
        }
    }
    return Iterators.concat(iterators);
}