java.util.Spliterators Java Examples

@Override
public boolean moveNext() {
    switch (this.state) {
        case 0:
            this.iterator = Spliterators.iterator(this.source);
            this.state = 1;
        case 1:
            if (this.iterator.hasNext()) {
                this.current = this.iterator.next();
                return true;
            }
            this.close();
            return false;
        default:
            return false;
    }
}
 

/**
 * Returns an infinite sequential ordered {@code DoubleStream} produced by iterative
 * application of a function {@code f} to an initial element {@code seed},
 * producing a {@code Stream} consisting of {@code seed}, {@code f(seed)},
 * {@code f(f(seed))}, etc.
 *
 * <p>The first element (position {@code 0}) in the {@code DoubleStream}
 * will be the provided {@code seed}.  For {@code n > 0}, the element at
 * position {@code n}, will be the result of applying the function {@code f}
 *  to the element at position {@code n - 1}.
 *
 * @param seed the initial element
 * @param f a function to be applied to to the previous element to produce
 *          a new element
 * @return a new sequential {@code DoubleStream}
 */
public static DoubleStream iterate(final double seed, final DoubleUnaryOperator f) {
    Objects.requireNonNull(f);
    final PrimitiveIterator.OfDouble iterator = new PrimitiveIterator.OfDouble() {
        double t = seed;

        @Override
        public boolean hasNext() {
            return true;
        }

        @Override
        public double nextDouble() {
            double v = t;
            t = f.applyAsDouble(t);
            return v;
        }
    };
    return StreamSupport.doubleStream(Spliterators.spliteratorUnknownSize(
            iterator,
            Spliterator.ORDERED | Spliterator.IMMUTABLE | Spliterator.NONNULL), false);
}
 

private void processDeletion(ResourceChange change) {
    String path = change.getPath();
    LOG.debug("Process resource deletion at path {}", path);

    Resource parent = resolver.getResource(BINDINGS_PARENT_PATH);
    Iterator<Resource> resourceIterator = parent.listChildren();

    Stream<Resource> targetStream = StreamSupport.stream(Spliterators.spliteratorUnknownSize(resourceIterator, Spliterator.ORDERED),
        false);

    targetStream.filter(res -> {
        ValueMap properties = res.getValueMap();
        LOG.debug("Checking the binding at {}", res.getPath());
        String cqConf = properties.get(Constants.PN_CONF, "");
        if (StringUtils.isEmpty(cqConf)) {
            return false;
        }
        return path.equals(cqConf + "/" + Constants.COMMERCE_BUCKET_PATH);
    }).findFirst().ifPresent(res -> {
        LOG.debug("Found a binding at {} that uses {}, we'll delete it", res.getPath(), path);
        deleteJcrNode(res);
    });
}
 

private static Stream<Node> toStream( NodeList nodeList )
{
    return StreamSupport.stream( new Spliterators.AbstractSpliterator<Node>( Long.MAX_VALUE, Spliterator.ORDERED )
    {
        private int nextIndex = 0;

        @Override
        public boolean tryAdvance( Consumer<? super Node> action )
        {
            if( nextIndex >= nodeList.getLength() )
            {
                return false;
            }
            action.accept( nodeList.item( nextIndex ) );
            nextIndex++;
            return true;
        }
    }, false );
}
 

/**
 * Returns an infinite sequential ordered {@code IntStream} produced by iterative
 * application of a function {@code f} to an initial element {@code seed},
 * producing a {@code Stream} consisting of {@code seed}, {@code f(seed)},
 * {@code f(f(seed))}, etc.
 *
 * <p>The first element (position {@code 0}) in the {@code IntStream} will be
 * the provided {@code seed}.  For {@code n > 0}, the element at position
 * {@code n}, will be the result of applying the function {@code f} to the
 * element at position {@code n - 1}.
 *
 * @param seed the initial element
 * @param f a function to be applied to the previous element to produce
 *          a new element
 * @return A new sequential {@code IntStream}
 */
public static IntStream iterate(final int seed, final IntUnaryOperator f) {
    Objects.requireNonNull(f);
    final PrimitiveIterator.OfInt iterator = new PrimitiveIterator.OfInt() {
        int t = seed;

        @Override
        public boolean hasNext() {
            return true;
        }

        @Override
        public int nextInt() {
            int v = t;
            t = f.applyAsInt(t);
            return v;
        }
    };
    return StreamSupport.intStream(Spliterators.spliteratorUnknownSize(
            iterator,
            Spliterator.ORDERED | Spliterator.IMMUTABLE | Spliterator.NONNULL), false);
}
 

/**
 * Streams the set of dates included in the range.
 * <p>
 * This returns a stream consisting of each date in the range.
 * The stream is ordered.
 * 
 * @param startInclusive  the start date
 * @param endExclusive  the end date
 * @return the stream of dates from the start to the end
 */
static Stream<LocalDate> stream(LocalDate startInclusive, LocalDate endExclusive) {
  Iterator<LocalDate> it = new Iterator<LocalDate>() {
    private LocalDate current = startInclusive;

    @Override
    public LocalDate next() {
      LocalDate result = current;
      current = plusDays(current, 1);
      return result;
    }

    @Override
    public boolean hasNext() {
      return current.isBefore(endExclusive);
    }
  };
  long count = endExclusive.toEpochDay() - startInclusive.toEpochDay() + 1;
  Spliterator<LocalDate> spliterator = Spliterators.spliterator(it, count,
      Spliterator.IMMUTABLE | Spliterator.NONNULL |
          Spliterator.DISTINCT | Spliterator.ORDERED | Spliterator.SORTED |
          Spliterator.SIZED | Spliterator.SUBSIZED);
  return StreamSupport.stream(spliterator, false);
}
 

@GET
@Path("_table")
@Timed(name = "bv.emodb.blob.BlobStoreResource1.listTables", absolute = true)
@ApiOperation (value = "List all the tables.",
        notes = "Returns a list of tables.",
        response = Table.class
)
public Iterator<Table> listTables(@QueryParam("from") final String fromKeyExclusive,
                                  @QueryParam("limit") @DefaultValue("10") LongParam limit,
                                  @Authenticated Subject subject) {
    _listTableRequestsByApiKey.getUnchecked(subject.getId()).mark();
    return streamingIterator(
        StreamSupport.stream(Spliterators.spliteratorUnknownSize(_blobStore.listTables(Strings.emptyToNull(fromKeyExclusive), Long.MAX_VALUE), 0), false)
            .filter(input -> subject.hasPermission(Permissions.readBlobTable(new NamedResource(input.getName()))))
            .limit(limit.get())
            .iterator()
    );
}
 

/**
 * Returns an infinite sequential ordered {@code LongStream} produced by iterative
 * application of a function {@code f} to an initial element {@code seed},
 * producing a {@code Stream} consisting of {@code seed}, {@code f(seed)},
 * {@code f(f(seed))}, etc.
 *
 * <p>The first element (position {@code 0}) in the {@code LongStream} will
 * be the provided {@code seed}.  For {@code n > 0}, the element at position
 * {@code n}, will be the result of applying the function {@code f} to the
 * element at position {@code n - 1}.
 *
 * @param seed the initial element
 * @param f a function to be applied to the previous element to produce
 *          a new element
 * @return a new sequential {@code LongStream}
 */
public static LongStream iterate(final long seed, final LongUnaryOperator f) {
    Objects.requireNonNull(f);
    final PrimitiveIterator.OfLong iterator = new PrimitiveIterator.OfLong() {
        long t = seed;

        @Override
        public boolean hasNext() {
            return true;
        }

        @Override
        public long nextLong() {
            long v = t;
            t = f.applyAsLong(t);
            return v;
        }
    };
    return StreamSupport.longStream(Spliterators.spliteratorUnknownSize(
            iterator,
            Spliterator.ORDERED | Spliterator.IMMUTABLE | Spliterator.NONNULL), false);
}
 

/**
 * Returns an infinite sequential ordered {@code IntStream} produced by iterative
 * application of a function {@code f} to an initial element {@code seed},
 * producing a {@code Stream} consisting of {@code seed}, {@code f(seed)},
 * {@code f(f(seed))}, etc.
 *
 * <p>The first element (position {@code 0}) in the {@code IntStream} will be
 * the provided {@code seed}.  For {@code n > 0}, the element at position
 * {@code n}, will be the result of applying the function {@code f} to the
 * element at position {@code n - 1}.
 *
 * @param seed the initial element
 * @param f a function to be applied to to the previous element to produce
 *          a new element
 * @return A new sequential {@code IntStream}
 */
public static IntStream iterate(final int seed, final IntUnaryOperator f) {
    Objects.requireNonNull(f);
    final PrimitiveIterator.OfInt iterator = new PrimitiveIterator.OfInt() {
        int t = seed;

        @Override
        public boolean hasNext() {
            return true;
        }

        @Override
        public int nextInt() {
            int v = t;
            t = f.applyAsInt(t);
            return v;
        }
    };
    return StreamSupport.intStream(Spliterators.spliteratorUnknownSize(
            iterator,
            Spliterator.ORDERED | Spliterator.IMMUTABLE | Spliterator.NONNULL), false);
}
 

public Spliterator<E> trySplit() {
    Node<E> h;
    final LinkedBlockingQueue<E> q = this.queue;
    int b = batch;
    int n = (b <= 0) ? 1 : (b >= MAX_BATCH) ? MAX_BATCH : b + 1;
    if (!exhausted &&
        ((h = current) != null || (h = q.head.next) != null) &&
        h.next != null) {
        Object[] a = new Object[n];
        int i = 0;
        Node<E> p = current;
        q.fullyLock();
        try {
            if (p != null || (p = q.head.next) != null) {
                do {
                    if ((a[i] = p.item) != null)
                        ++i;
                } while ((p = p.next) != null && i < n);
            }
        } finally {
            q.fullyUnlock();
        }
        if ((current = p) == null) {
            est = 0L;
            exhausted = true;
        }
        else if ((est -= i) < 0L)
            est = 0L;
        if (i > 0) {
            batch = i;
            return Spliterators.spliterator
                (a, 0, i, Spliterator.ORDERED | Spliterator.NONNULL |
                 Spliterator.CONCURRENT);
        }
    }
    return null;
}
 

@PostConstruct
private void init() {
    latestApiVersion = StreamSupport
            .stream(Spliterators.spliteratorUnknownSize(applications.iterator(), Spliterator.IMMUTABLE), false)
            .filter(a -> a.getClass().isAnnotationPresent(ApplicationPath.class))
            .map(a -> a.getClass().getAnnotation(ApplicationPath.class).value())
            .map(path -> path.replace("api/v", ""))
            .mapToInt(Integer::parseInt)
            .max()
            .orElse(1);
    startTime = new Date();
}
 

@Test
public void testDoubleSpliterator() {
    for (int size : new int[] { 1, 5, 100, 1000, 1023, 1024, 1025, 2049 }) {
        double[] input = LongStreamEx.range(size).asDoubleStream().toArray();
        checkSpliterator(String.valueOf(size), DoubleStreamEx.of(input).boxed().toList(),
            () -> new UnknownSizeSpliterator.USOfDouble(Spliterators.iterator(Spliterators.spliterator(input, 0))));
    }
}
 

/**
 * Create a stream of long values from iterating through a dataset
 * @param a dataset
 * @return long stream
 */
public static LongStream createDatasetStream(LongDataset a, boolean parallel) {
	if (a.getStrides() == null) {
		StreamSupport.longStream(Spliterators.spliterator(a.getData(), FLAGS), parallel);
	}
	return StreamSupport.longStream(new LongDatasetSpliterator(a), parallel);
}
 

@Override
@SuppressWarnings("PMD.CloseResource")
public Stream<AccessEvent> events() throws IOException {
  DataInputStream input = new DataInputStream(new BufferedInputStream(readFile()));
  Stream<AccessEvent> stream = StreamSupport.stream(Spliterators.spliteratorUnknownSize(
      new TraceIterator(input), Spliterator.ORDERED), /* parallel */ false);
  return stream.onClose(() -> Closeables.closeQuietly(input));
}
 

/**
 * Returns a stream of {@code int} zero-extending the {@code char} values
 * from this sequence.  Any char which maps to a <a
 * href="{@docRoot}/java/lang/Character.html#unicode">surrogate code
 * point</a> is passed through uninterpreted.
 *
 * <p>If the sequence is mutated while the stream is being read, the
 * result is undefined.
 *
 * @return an IntStream of char values from this sequence
 * @since 1.8
 */
public default IntStream chars() {
    class CharIterator implements PrimitiveIterator.OfInt {
        int cur = 0;

        public boolean hasNext() {
            return cur < length();
        }

        public int nextInt() {
            if (hasNext()) {
                return charAt(cur++);
            } else {
                throw new NoSuchElementException();
            }
        }

        @Override
        public void forEachRemaining(IntConsumer block) {
            for (; cur < length(); cur++) {
                block.accept(charAt(cur));
            }
        }
    }

    return StreamSupport.intStream(() ->
            Spliterators.spliterator(
                    new CharIterator(),
                    length(),
                    Spliterator.ORDERED),
            Spliterator.SUBSIZED | Spliterator.SIZED | Spliterator.ORDERED,
            false);
}
 

@Override
public Spliterator<T> trySplit() {
    Spliterator<T> prefix = source.trySplit();
    if (prefix == null) {
        return null;
    }
    if (checked.get()) {
        return drop ? prefix : Spliterators.emptySpliterator();
    }
    UnorderedTDOfRef<T> clone = doClone();
    clone.source = prefix;
    return clone;
}
 

/**
 * Returns a stream of {@code int} zero-extending the {@code char} values
 * from this sequence.  Any char which maps to a <a
 * href="{@docRoot}/java/lang/Character.html#unicode">surrogate code
 * point</a> is passed through uninterpreted.
 *
 * <p>If the sequence is mutated while the stream is being read, the
 * result is undefined.
 *
 * @return an IntStream of char values from this sequence
 * @since 1.8
 */
public default IntStream chars() {
    class CharIterator implements PrimitiveIterator.OfInt {
        int cur = 0;

        public boolean hasNext() {
            return cur < length();
        }

        public int nextInt() {
            if (hasNext()) {
                return charAt(cur++);
            } else {
                throw new NoSuchElementException();
            }
        }

        @Override
        public void forEachRemaining(IntConsumer block) {
            for (; cur < length(); cur++) {
                block.accept(charAt(cur));
            }
        }
    }

    return StreamSupport.intStream(() ->
            Spliterators.spliterator(
                    new CharIterator(),
                    length(),
                    Spliterator.ORDERED),
            Spliterator.SUBSIZED | Spliterator.SIZED | Spliterator.ORDERED,
            false);
}
 

@Override
public Iterable<Map.Entry<String, Set<Permission>>> getAll() {
    validateTable();

    return () -> {
        Iterator<Map<String, Object>> records = _dataStore.scan(_tableName, null, Long.MAX_VALUE, false, ReadConsistency.STRONG);
        return StreamSupport.stream(Spliterators.spliteratorUnknownSize(records, 0), false)
                .map(record -> Maps.immutableEntry(Intrinsic.getId(record), extractPermissionsFromRecord(record)))
                .iterator();
    };
}
 

/**
 * Lines.
 *
 * @return the stream
 */
public Stream<String> lines() {
  Iterator<String> iter = new Iterator<String>() {
    String nextLine = null;

    @Override
    public boolean hasNext() {
      if (nextLine != null) {
        return true;
      } else {
        try {
          nextLine = readLine();
          return (nextLine != null);
        } catch (IOException e) {
          throw new UncheckedIOException(e);
        }
      }
    }

    @Override
    public String next() {
      if (nextLine != null || hasNext()) {
        String line = nextLine;
        nextLine = null;
        return line;
      } else {
        throw new NoSuchElementException();
      }
    }
  };
  return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iter,
      Spliterator.ORDERED | Spliterator.NONNULL), false);
}
 

@Override
public Tuple<Collection<ExecutionLineageNode>, Collection<ChannelInstance>> evaluate(
        ChannelInstance[] inputs,
        ChannelInstance[] outputs,
        JavaExecutor executor,
        OptimizationContext.OperatorContext operatorContext) {
    // Cast the inputs and outputs.
    final SqlQueryChannel.Instance input = (SqlQueryChannel.Instance) inputs[0];
    final StreamChannel.Instance output = (StreamChannel.Instance) outputs[0];

    JdbcPlatformTemplate producerPlatform = (JdbcPlatformTemplate) input.getChannel().getProducer().getPlatform();
    final Connection connection = producerPlatform
            .createDatabaseDescriptor(executor.getConfiguration())
            .createJdbcConnection();

    Iterator<Record> resultSetIterator = new ResultSetIterator(connection, input.getSqlQuery());
    Spliterator<Record> resultSetSpliterator = Spliterators.spliteratorUnknownSize(resultSetIterator, 0);
    Stream<Record> resultSetStream = StreamSupport.stream(resultSetSpliterator, false);

    output.accept(resultSetStream);

    ExecutionLineageNode queryLineageNode = new ExecutionLineageNode(operatorContext);
    queryLineageNode.add(LoadProfileEstimators.createFromSpecification(
            String.format("rheem.%s.sqltostream.load.query", this.jdbcPlatform.getPlatformId()),
                    executor.getConfiguration()
            ));
    queryLineageNode.addPredecessor(input.getLineage());
    ExecutionLineageNode outputLineageNode = new ExecutionLineageNode(operatorContext);
    outputLineageNode.add(LoadProfileEstimators.createFromSpecification(
            String.format("rheem.%s.sqltostream.load.output", this.jdbcPlatform.getPlatformId()),
            executor.getConfiguration()
    ));
    output.getLineage().addPredecessor(outputLineageNode);

    return queryLineageNode.collectAndMark();
}
 

@Override
public Iterator<StateEntry<K, N, S>> iterator() {
	return Arrays.stream(keyGroupedStateMaps)
		.filter(Objects::nonNull)
		.flatMap(stateMap -> StreamSupport.stream(Spliterators.spliteratorUnknownSize(stateMap.iterator(), 0), false))
		.iterator();
}
 

@Override
public Stream<Place> streamAll() {
   Context timer = streamAllTimer.time();
   Iterator<Row> rows = session.execute(streamAll.bind()).iterator();
   Iterator<Place> result = TimingIterator.time(
         Iterators.transform(rows, (row) -> buildEntity(row)),
         timer
   );
   Spliterator<Place> stream = Spliterators.spliteratorUnknownSize(result, Spliterator.IMMUTABLE | Spliterator.NONNULL);
   return StreamSupport.stream(stream, false);
}
 

public Stream<LocalWeatherData> generate() {

        // Build the Station:
        final Station station = getStation(getGeoLocation());

        // For Creating the Measurement TimeSteps:
        final DateTimeIterator iterator = new DateTimeIterator(startDate, endDate, interval);

        // Create the Stream:
        return StreamSupport
                .stream(Spliterators.spliteratorUnknownSize(iterator, Spliterator.ORDERED), false)
                .map(measurementTimeStamp -> createLocalWeatherData(station, measurementTimeStamp));

    }
 

/**
 * Returns a stream of {@code int} zero-extending the {@code char} values
 * from this sequence.  Any char which maps to a <a
 * href="{@docRoot}/java/lang/Character.html#unicode">surrogate code
 * point</a> is passed through uninterpreted.
 *
 * <p>The stream binds to this sequence when the terminal stream operation
 * commences (specifically, for mutable sequences the spliterator for the
 * stream is <a href="../util/Spliterator.html#binding"><em>late-binding</em></a>).
 * If the sequence is modified during that operation then the result is
 * undefined.
 *
 * @return an IntStream of char values from this sequence
 * @since 1.8
 */
public default IntStream chars() {
    class CharIterator implements PrimitiveIterator.OfInt {
        int cur = 0;

        public boolean hasNext() {
            return cur < length();
        }

        public int nextInt() {
            if (hasNext()) {
                return charAt(cur++);
            } else {
                throw new NoSuchElementException();
            }
        }

        @Override
        public void forEachRemaining(IntConsumer block) {
            for (; cur < length(); cur++) {
                block.accept(charAt(cur));
            }
        }
    }

    return StreamSupport.intStream(() ->
            Spliterators.spliterator(
                    new CharIterator(),
                    length(),
                    Spliterator.ORDERED),
            Spliterator.SUBSIZED | Spliterator.SIZED | Spliterator.ORDERED,
            false);
}
 

private static <T> Stream<T> streamFromArray(T[] a) {
    return StreamSupport.stream(
            Spliterators.spliterator(
                    a,
                    Spliterator.DISTINCT | Spliterator.IMMUTABLE | Spliterator.NONNULL),
            false);
}
 

@Override
    public Iterator<M> receiveMessages() {
        final MultiIterator<M> multiIterator = new MultiIterator<>();
        for (final MessageScope messageScope : this.messageBoard.receiveMessages.keySet()) {
//        for (final MessageScope messageScope : this.messageBoard.previousMessageScopes) {
            if (messageScope instanceof MessageScope.Local) {
                final MessageScope.Local<M> localMessageScope = (MessageScope.Local<M>) messageScope;
                final Traversal.Admin<Vertex, Edge> incidentTraversal = TinkerMessenger.setVertexStart(localMessageScope.getIncidentTraversal().get().asAdmin(), this.vertex);
                final Direction direction = TinkerMessenger.getDirection(incidentTraversal);
                final Edge[] edge = new Edge[1]; // simulates storage side-effects available in Gremlin, but not Java8 streams
                multiIterator.addIterator(StreamSupport.stream(Spliterators.spliteratorUnknownSize(VertexProgramHelper.reverse(incidentTraversal.asAdmin()), Spliterator.IMMUTABLE | Spliterator.SIZED), false)
                        .map((Edge e) -> {
                            edge[0] = e;
                            Vertex vv;
                            if (direction.equals(Direction.IN) || direction.equals(Direction.OUT)) {
                                vv = e.vertices(direction).next();
                            } else {
                                vv = e.outVertex() == this.vertex ? e.inVertex() : e.outVertex();
                            }
                            return this.messageBoard.receiveMessages.get(messageScope).get(vv);
                        })
                        .filter(q -> null != q)
                        .flatMap(Queue::stream)
                        .map(message -> localMessageScope.getEdgeFunction().apply(message, edge[0]))
                        .iterator());

            } else {
                multiIterator.addIterator(Stream.of(this.vertex)
                        .map(this.messageBoard.receiveMessages.get(messageScope)::get)
                        .filter(q -> null != q)
                        .flatMap(Queue::stream)
                        .iterator());
            }
        }
        return multiIterator;
    }
 

public Spliterator<E> trySplit() {
    Node<E> h;
    final LinkedBlockingQueue<E> q = this.queue;
    int b = batch;
    int n = (b <= 0) ? 1 : (b >= MAX_BATCH) ? MAX_BATCH : b + 1;
    if (!exhausted &&
        ((h = current) != null || (h = q.head.next) != null) &&
        h.next != null) {
        Object[] a = new Object[n];
        int i = 0;
        Node<E> p = current;
        q.fullyLock();
        try {
            if (p != null || (p = q.head.next) != null) {
                do {
                    if ((a[i] = p.item) != null)
                        ++i;
                } while ((p = p.next) != null && i < n);
            }
        } finally {
            q.fullyUnlock();
        }
        if ((current = p) == null) {
            est = 0L;
            exhausted = true;
        }
        else if ((est -= i) < 0L)
            est = 0L;
        if (i > 0) {
            batch = i;
            return Spliterators.spliterator
                (a, 0, i, Spliterator.ORDERED | Spliterator.NONNULL |
                 Spliterator.CONCURRENT);
        }
    }
    return null;
}
 

/**
 * Returns a {@code Stream}, the elements of which are lines read from
 * this {@code BufferedReader}.  The {@link Stream} is lazily populated,
 * i.e., read only occurs during the
 * <a href="../util/stream/package-summary.html#StreamOps">terminal
 * stream operation</a>.
 *
 * <p> The reader must not be operated on during the execution of the
 * terminal stream operation. Otherwise, the result of the terminal stream
 * operation is undefined.
 *
 * <p> After execution of the terminal stream operation there are no
 * guarantees that the reader will be at a specific position from which to
 * read the next character or line.
 *
 * <p> If an {@link IOException} is thrown when accessing the underlying
 * {@code BufferedReader}, it is wrapped in an {@link
 * UncheckedIOException} which will be thrown from the {@code Stream}
 * method that caused the read to take place. This method will return a
 * Stream if invoked on a BufferedReader that is closed. Any operation on
 * that stream that requires reading from the BufferedReader after it is
 * closed, will cause an UncheckedIOException to be thrown.
 *
 * @return a {@code Stream<String>} providing the lines of text
 *         described by this {@code BufferedReader}
 *
 * @since 1.8
 */
public Stream<String> lines() {
    Iterator<String> iter = new Iterator<String>() {
        String nextLine = null;

        @Override
        public boolean hasNext() {
            if (nextLine != null) {
                return true;
            } else {
                try {
                    nextLine = readLine();
                    return (nextLine != null);
                } catch (IOException e) {
                    throw new UncheckedIOException(e);
                }
            }
        }

        @Override
        public String next() {
            if (nextLine != null || hasNext()) {
                String line = nextLine;
                nextLine = null;
                return line;
            } else {
                throw new NoSuchElementException();
            }
        }
    };
    return StreamSupport.stream(Spliterators.spliteratorUnknownSize(
            iter, Spliterator.ORDERED | Spliterator.NONNULL), false);
}
 

/**
 * Don't use this directly, use select()... spliterator instead where possible.
 * Otherwise, insure the FSIterator instance can support sized/subsized.
 * @return a split iterator for this iterator, which has the following characteristics
 *   DISTINCT, SIZED, SUBSIZED
 *   
 */
default Spliterator<T> spliterator() {
  return Spliterators.spliterator(
      this, 
      ((LowLevelIterator<T>)this).ll_indexSizeMaybeNotCurrent(), 

      Spliterator.DISTINCT |
      Spliterator.SIZED    |
      Spliterator.SUBSIZED);
}
 

@MustBeClosed
public Stream<ColumnEntry<TKey, TValue>> toStream() {
  assertOpen();
  final Spliterator<ColumnEntry<TKey, TValue>> split =
      Spliterators.spliteratorUnknownSize(
          this,
          Spliterator.IMMUTABLE
              | Spliterator.DISTINCT
              | Spliterator.NONNULL
              | Spliterator.ORDERED
              | Spliterator.SORTED);

  return StreamSupport.stream(split, false).onClose(this::close);
}