Examples with Spliterator java.util.Spliterator used on opensource projects

Example 26 with Spliterator

use of java.util.Spliterator in project archiva by apache.

the class CassandraMetadataRepository method createResultSpliterator.

private <T> Spliterator<T> createResultSpliterator(ResultSet result, BiFunction<Row, T, T> converter) throws MetadataRepositoryException {
    final Iterator<Row> it = result.iterator();
    return new Spliterator<T>() {

        private T lastItem = null;

        @Override
        public boolean tryAdvance(Consumer<? super T> action) {
            if (it.hasNext()) {
                while (it.hasNext()) {
                    Row row = it.next();
                    T item = converter.apply(row, lastItem);
                    if (item != null && lastItem != null && item != lastItem) {
                        action.accept(lastItem);
                        lastItem = item;
                        return true;
                    }
                    lastItem = item;
                }
                action.accept(lastItem);
                return true;
            } else {
                return false;
            }
        }

        @Override
        public Spliterator<T> trySplit() {
            return null;
        }

        @Override
        public long estimateSize() {
            return Long.MAX_VALUE;
        }

        @Override
        public int characteristics() {
            return ORDERED + NONNULL;
        }
    };
}

Example 27 with Spliterator

use of java.util.Spliterator in project j2cl by google.

the class LongStreamImpl method flatMap.

@Override
public LongStream flatMap(LongFunction<? extends LongStream> mapper) {
    throwIfTerminated();
    final Spliterator<? extends LongStream> spliteratorOfStreams = new MapToObjSpliterator<>(mapper, spliterator);
    AbstractLongSpliterator flatMapSpliterator = new Spliterators.AbstractLongSpliterator(Long.MAX_VALUE, 0) {

        LongStream nextStream;

        Spliterator.OfLong next;

        @Override
        public boolean tryAdvance(LongConsumer action) {
            // look for a new spliterator
            while (advanceToNextSpliterator()) {
                // if we have one, try to read and use it
                if (next.tryAdvance(action)) {
                    return true;
                } else {
                    nextStream.close();
                    nextStream = null;
                    // failed, null it out so we can find another
                    next = null;
                }
            }
            return false;
        }

        private boolean advanceToNextSpliterator() {
            while (next == null) {
                if (!spliteratorOfStreams.tryAdvance(n -> {
                    if (n != null) {
                        nextStream = n;
                        next = n.spliterator();
                    }
                })) {
                    return false;
                }
            }
            return true;
        }
    };
    return new LongStreamImpl(this, flatMapSpliterator);
}

Example 28 with Spliterator

use of java.util.Spliterator in project j2cl by google.

the class StreamImpl method flatMapToLong.

@Override
public LongStream flatMapToLong(Function<? super T, ? extends LongStream> mapper) {
    throwIfTerminated();
    final Spliterator<? extends LongStream> spliteratorOfStreams = new MapToObjSpliterator<>(mapper, spliterator);
    AbstractLongSpliterator flatMapSpliterator = new Spliterators.AbstractLongSpliterator(Long.MAX_VALUE, 0) {

        LongStream nextStream;

        Spliterator.OfLong next;

        @Override
        public boolean tryAdvance(LongConsumer action) {
            // look for a new spliterator
            while (advanceToNextSpliterator()) {
                // if we have one, try to read and use it
                if (next.tryAdvance(action)) {
                    return true;
                } else {
                    nextStream.close();
                    nextStream = null;
                    // failed, null it out so we can find another
                    next = null;
                }
            }
            return false;
        }

        private boolean advanceToNextSpliterator() {
            while (next == null) {
                if (!spliteratorOfStreams.tryAdvance(n -> {
                    if (n != null) {
                        nextStream = n;
                        next = n.spliterator();
                    }
                })) {
                    return false;
                }
            }
            return true;
        }
    };
    return new LongStreamImpl(this, flatMapSpliterator);
}

Example 29 with Spliterator

use of java.util.Spliterator in project proxima-platform by O2-Czech-Republic.

the class HadoopFileSystem method list.

@Override
public Stream<Path> list(long minTs, long maxTs) {
    URI remappedUri = HadoopStorage.remap(getUri());
    RemoteIterator<LocatedFileStatus> iterator = ExceptionUtils.uncheckedFactory(() -> fs().listFiles(new org.apache.hadoop.fs.Path(remappedUri), true));
    Spliterator<LocatedFileStatus> spliterator = asSpliterator(iterator);
    return StreamSupport.stream(spliterator, false).filter(LocatedFileStatus::isFile).map(f -> f.getPath().toUri().toString().substring(remappedUri.toString().length())).filter(name -> namingConvention.isInRange(name, minTs, maxTs)).map(name -> HadoopPath.of(this, remappedUri + name, accessor));
}

Example 30 with Spliterator

use of java.util.Spliterator in project timbuctoo by HuygensING.

the class ChangeLog method getProvenanceChanges.

protected Stream<Change> getProvenanceChanges(DataSet dataSet, String[] subjects, CustomProvenance provenance, Map<String, JsonNode> values) {
    TypeNameStore typeNameStore = dataSet.getTypeNameStore();
    Stream<Change> customProv = provenance.getFields().stream().filter(field -> field.getValueType() != null).flatMap(field -> {
        String graphQlPred = typeNameStore.makeGraphQlnameForPredicate(field.getUri(), Direction.OUT, field.isList());
        return Stream.of(subjects).map(subject -> new Change(subject, field.getUri(), getValues(dataSet, values.get(graphQlPred)), Stream.empty()));
    });
    Stream<Change> customProvNested = provenance.getFields().stream().filter(field -> field.getObject() != null).flatMap(field -> {
        String graphQlPred = typeNameStore.makeGraphQlnameForPredicate(field.getUri(), Direction.OUT, field.isList());
        JsonNode objectValues = values.get(graphQlPred);
        if (objectValues.isArray()) {
            Spliterator<JsonNode> spliterator = Spliterators.spliteratorUnknownSize(objectValues.iterator(), Spliterator.ORDERED);
            return StreamSupport.stream(spliterator, false).flatMap(newObjectValues -> getChangesForProvObject(dataSet, newObjectValues, subjects, field));
        }
        return getChangesForProvObject(dataSet, objectValues, subjects, field);
    });
    return Stream.concat(customProv, customProvNested);
}