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.mahout.common.iterator.StringRecordIterator.java

public StringRecordIterator(Iterable<String> stringIterator, String pattern) {
    this.splitter = Pattern.compile(pattern);
    delegate = Iterators.transform(stringIterator.iterator(), new Function<String, Pair<List<String>, Long>>() {
        @Override/*from w ww. j av a2s .c  o m*/
        public Pair<List<String>, Long> apply(String from) {
            String[] items = splitter.split(from);
            return new Pair<List<String>, Long>(Arrays.asList(items), ONE);
        }
    });
}

From source file:org.apache.gobblin.data.management.copy.IterableCopyableDatasetImpl.java

private static Iterator<FileSet<CopyEntity>> partitionCopyableFiles(Dataset dataset,
        Collection<? extends CopyEntity> files) {
    Map<String, FileSet.Builder<CopyEntity>> partitionBuildersMaps = Maps.newHashMap();
    for (CopyEntity file : files) {
        if (!partitionBuildersMaps.containsKey(file.getFileSet())) {
            partitionBuildersMaps.put(file.getFileSet(), new FileSet.Builder<>(file.getFileSet(), dataset));
        }//from  ww  w.  jav a2 s.c o m
        partitionBuildersMaps.get(file.getFileSet()).add(file);
    }
    return Iterators.transform(partitionBuildersMaps.values().iterator(),
            new Function<FileSet.Builder<CopyEntity>, FileSet<CopyEntity>>() {
                @Nullable
                @Override
                public FileSet<CopyEntity> apply(@Nonnull FileSet.Builder<CopyEntity> input) {
                    return input.build();
                }
            });
}

From source file:biz.ganttproject.impex.csv.CsvReaderImpl.java

@Override
public Iterator<SpreadsheetRecord> iterator() {
    return Iterators.transform(myParser.iterator(), CsvRecordImpl::new);
}

From source file:ai.grakn.graql.internal.reasoner.iterator.LazyAnswerIterator.java

public LazyAnswerIterator unify(Unifier unifier) {
    if (unifier.isEmpty())
        return this;
    Iterator<Answer> transform = Iterators.transform(iterator(), input -> {
        if (input == null)
            return null;
        return input.unify(unifier);
    });//from  www.j a v a  2 s  . com
    return new LazyAnswerIterator(transform);
}

From source file:net.automatalib.graphs.IndefiniteGraph.java

@Override
default Iterator<N> adjacentTargetsIterator(N node) {
    return Iterators.transform(outgoingEdgesIterator(node), this::getTarget);
}

From source file:com.cloudera.exhibit.mongodb.BSONFrame.java

@Override
public Iterator<Obs> iterator() {
    return Iterators.transform(records.iterator(), new Function<BSONObject, Obs>() {
        @Override/*from w w w . j  av  a2 s . c  o  m*/
        public Obs apply(BSONObject bsonObject) {
            return new BSONObs(descriptor, bsonObject);
        }
    });
}

From source file:org.sonatype.nexus.timeline.TimelineResultWrapper.java

@Override
public Iterator<Entry> iterator() {
    return Iterators.transform(result.iterator(), new Function<TimelineRecord, Entry>() {
        @Override/*  ww  w . j a  v  a2 s  . c  o m*/
        public Entry apply(@Nullable final TimelineRecord input) {
            return new TimelineRecordWrapper(input);
        }
    });
}

From source file:org.apache.gobblin.util.request_allocation.StringRequestor.java

@Override
public Iterator<StringRequest> iterator() {
    return Iterators.transform(this.strings.iterator(), new Function<String, StringRequest>() {
        @Override/*from   ww w.  j ava2 s  . c o m*/
        public StringRequest apply(String input) {
            return new StringRequest(StringRequestor.this, input);
        }
    });
}

From source file:ch.ethz.inf.vs.hypermedia.corehal.LinkList.java

public Iterable<Link> linkValues() {
    return () -> Iterators.concat(Iterators.transform(values().iterator(), (x) -> x.iterator()));
}

From source file:com.github.rinde.opt.localsearch.Insertions.java

/**
 * Creates an {@link Iterator} for a list of lists, each list contains a
 * specified number of insertions of <code>item</code> at a different position
 * in the list. Only creates insertions starting at <code>startIndex</code>.
 * @param list The original list.//from www . j a v  a  2  s  . co m
 * @param item The item to be inserted.
 * @param startIndex Must be &ge; 0 &amp;&amp; &le; list size.
 * @param numOfInsertions The number of times <code>item</code> is inserted.
 * @param <T> The list item type.
 * @return Iterator producing a list of lists of size
 *         <code>(n+1)-startIndex</code>.
 */
public static <T> Iterator<ImmutableList<T>> insertionsIterator(ImmutableList<T> list, T item, int startIndex,
        int numOfInsertions) {
    checkArgument(startIndex >= 0 && startIndex <= list.size(),
            "startIndex must be >= 0 and <= %s (list size), it is %s.", list.size(), startIndex);
    checkArgument(numOfInsertions > 0, "numOfInsertions must be positive.");
    return Iterators.transform(new InsertionIndexGenerator(numOfInsertions, list.size(), startIndex),
            new IndexToInsertionTransform<T>(list, item));
}