Example usage for java.util Iterator Iterator

Introduction

In this page you can find the example usage for java.util Iterator Iterator.

Prototype

Iterator

Source Link

Usage

From source file:io.druid.firehose.azure.StaticAzureBlobStoreFirehoseFactory.java

@Override
public Firehose connect(StringInputRowParser stringInputRowParser) throws IOException {
    Preconditions.checkNotNull(azureStorage, "null azureStorage");

    final LinkedList<AzureBlob> objectQueue = Lists.newLinkedList(blobs);

    return new FileIteratingFirehose(new Iterator<LineIterator>() {
        @Override//from   w ww.j  a v a  2s .  c o m
        public boolean hasNext() {
            return !objectQueue.isEmpty();
        }

        @Override
        public LineIterator next() {
            final AzureBlob nextURI = objectQueue.poll();

            final String container = nextURI.getContainer();
            final String path = nextURI.getPath().startsWith("/") ? nextURI.getPath().substring(1)
                    : nextURI.getPath();

            try {
                final InputStream innerInputStream = new AzureByteSource(azureStorage, container, path)
                        .openStream();

                final InputStream outerInputStream = path.endsWith(".gz")
                        ? CompressionUtils.gzipInputStream(innerInputStream)
                        : innerInputStream;

                return IOUtils.lineIterator(
                        new BufferedReader(new InputStreamReader(outerInputStream, Charsets.UTF_8)));
            } catch (Exception e) {
                log.error(e, "Exception opening container[%s] blob[%s]", container, path);

                throw Throwables.propagate(e);
            }
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }, stringInputRowParser);
}

From source file:org.apache.oodt.cas.cli.util.CmdLineIterable.java

public Iterator<T> iterator() {
    return new Iterator<T>() {

        public boolean hasNext() {
            return CmdLineIterable.this.hasNext();
        }/*from w ww. j a v  a  2s .co m*/

        public T next() {
            if (!hasNext()) {
                throw new IndexOutOfBoundsException((curIndex + 1) + "");
            }
            return incrementAndGet();
        }

        public void remove() {
            // do nothing
        }

    };
}

From source file:io.druid.firehose.google.StaticGoogleBlobStoreFirehoseFactory.java

@Override
public Firehose connect(StringInputRowParser stringInputRowParser) throws IOException {
    Preconditions.checkNotNull(storage, "null storage");

    final LinkedList<GoogleBlob> objectQueue = Lists.newLinkedList(blobs);

    return new FileIteratingFirehose(new Iterator<LineIterator>() {
        @Override//from   www . jav  a2 s .  co  m
        public boolean hasNext() {
            return !objectQueue.isEmpty();
        }

        @Override
        public LineIterator next() {
            final GoogleBlob nextURI = objectQueue.poll();

            final String bucket = nextURI.getBucket();
            final String path = nextURI.getPath().startsWith("/") ? nextURI.getPath().substring(1)
                    : nextURI.getPath();

            try {
                final InputStream innerInputStream = new GoogleByteSource(storage, bucket, path).openStream();

                final InputStream outerInputStream = path.endsWith(".gz")
                        ? CompressionUtils.gzipInputStream(innerInputStream)
                        : innerInputStream;

                return IOUtils.lineIterator(
                        new BufferedReader(new InputStreamReader(outerInputStream, Charsets.UTF_8)));
            } catch (Exception e) {
                LOG.error(e, "Exception opening bucket[%s] blob[%s]", bucket, path);

                throw Throwables.propagate(e);
            }
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }, stringInputRowParser);
}

From source file:net.collegeman.grails.e3db.GroovySqlRowSet.java

public Iterator iterator() {
    final GroovySqlRowSet parent = this;

    return new Iterator() {
        public boolean hasNext() {
            return rs.next();
        }// w  w w . j a v  a2s.c o m

        public Object next() {
            return parent;
        }

        public void remove() {
            throw new IllegalStateException("Cannot remove items from a SqlRowSet.");
        }
    };
}

From source file:de.schildbach.game.BoardGeometry.java

protected Iterator<Coordinate> pieceIterator(final Board board, final int color) {
    final Iterator<Coordinate> boardIterator = this.coordinateIterator();
    return new Iterator<Coordinate>() {
        Coordinate next = null;//from ww w. jav a 2 s. c o  m

        public boolean hasNext() {
            if (next != null) {
                return true;
            } else {
                while (boardIterator.hasNext()) {
                    next = boardIterator.next();
                    Piece piece = board.getPiece(next);
                    if (piece != null && piece.getColor() == color)
                        return true;
                }
                next = null;
                return false;
            }
        }

        public Coordinate next() {
            if (hasNext()) {
                Coordinate result = next;
                next = null;
                return result;
            } else
                throw new NoSuchElementException();
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
}

From source file:com.opengamma.engine.depgraph.OrderedRunQueue.java

@Override
public Iterator<ContextRunnable> iterator() {
    return new Iterator<ContextRunnable>() {

        private int _count;

        @Override/*from  w  w w  .j  a va 2s .  c  om*/
        public boolean hasNext() {
            return _count < size();
        }

        @Override
        public ContextRunnable next() {
            return _buffer[_count++];
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
}

From source file:org.apache.pig.backend.local.executionengine.LocalJob.java

public Iterator<Tuple> getResults() throws ExecException {
    final LoadFunc p;

    try {//from  w w w . ja  va2s .com
        p = (LoadFunc) PigContext.instantiateFuncFromSpec(outFileSpec.getFuncSpec());

        InputStream is = FileLocalizer.open(outFileSpec.getFileName(), pigContext);

        p.bindTo(outFileSpec.getFileName(), new BufferedPositionedInputStream(is), 0, Long.MAX_VALUE);

    } catch (Exception e) {
        throw new ExecException("Unable to get results for " + outFileSpec, e);
    }

    return new Iterator<Tuple>() {
        Tuple t;
        boolean atEnd;

        public boolean hasNext() {
            if (atEnd)
                return false;
            try {
                if (t == null)
                    t = p.getNext();
                if (t == null)
                    atEnd = true;
            } catch (Exception e) {
                log.error(e);
                t = null;
                atEnd = true;
            }
            return !atEnd;
        }

        public Tuple next() {
            Tuple next = t;
            if (next != null) {
                t = null;
                return next;
            }
            try {
                next = p.getNext();
            } catch (Exception e) {
                log.error(e);
            }
            if (next == null)
                atEnd = true;
            return next;
        }

        public void remove() {
            throw new RuntimeException("Removal not supported");
        }

    };
}

From source file:org.omnaest.utils.table.impl.StripeImpl.java

/**
 * //w w  w .  ja v a  2 s .c o  m
 */
public Iterator<E> iterator() {
    final int indexMax = this.size() - 1;
    return new Iterator<E>() {
        private int index = -1;

        @Override
        public boolean hasNext() {
            return this.index + 1 <= indexMax;
        }

        @Override
        public E next() {
            return getElement(++this.index);
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
}

From source file:io.druid.firehose.s3.StaticS3FirehoseFactory.java

@Override
public Firehose connect(StringInputRowParser firehoseParser) throws IOException {
    Preconditions.checkNotNull(s3Client, "null s3Client");

    final LinkedList<URI> objectQueue = Lists.newLinkedList(uris);

    return new FileIteratingFirehose(new Iterator<LineIterator>() {
        @Override// w w  w. j  a va2 s .co m
        public boolean hasNext() {
            return !objectQueue.isEmpty();
        }

        @Override
        public LineIterator next() {
            final URI nextURI = objectQueue.poll();

            final String s3Bucket = nextURI.getAuthority();
            final S3Object s3Object = new S3Object(
                    nextURI.getPath().startsWith("/") ? nextURI.getPath().substring(1) : nextURI.getPath());

            log.info("Reading from bucket[%s] object[%s] (%s)", s3Bucket, s3Object.getKey(), nextURI);

            try {
                final InputStream innerInputStream = s3Client
                        .getObject(new S3Bucket(s3Bucket), s3Object.getKey()).getDataInputStream();

                final InputStream outerInputStream = s3Object.getKey().endsWith(".gz")
                        ? CompressionUtils.gzipInputStream(innerInputStream)
                        : innerInputStream;

                return IOUtils.lineIterator(
                        new BufferedReader(new InputStreamReader(outerInputStream, Charsets.UTF_8)));
            } catch (Exception e) {
                log.error(e, "Exception reading from bucket[%s] object[%s]", s3Bucket, s3Object.getKey());

                throw Throwables.propagate(e);
            }
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }, firehoseParser);
}

From source file:com.github.steveash.guavate.Guavate.java

/**
 * Creates a stream that wraps a stream with the index.
 * <p>/*from  w  ww  .  j  a  va 2  s.c o  m*/
 * Each input object is decorated with an {@link ObjIntPair}.
 * The {@code int} is the index of the element in the stream.
 * @param <T> the type of the stream
 * @param stream the stream to index
 * @return a stream of pairs, containing the element and index
 */
public static <T> Stream<ObjIntPair<T>> zipWithIndex(Stream<T> stream) {
    Spliterator<T> split1 = stream.spliterator();
    Iterator<T> it1 = Spliterators.iterator(split1);
    Iterator<ObjIntPair<T>> it = new Iterator<ObjIntPair<T>>() {
        int index = 0;

        @Override
        public boolean hasNext() {
            return it1.hasNext();
        }

        @Override
        public ObjIntPair<T> next() {
            return ObjIntPair.of(it1.next(), index++);
        }
    };
    Spliterator<ObjIntPair<T>> split = Spliterators.spliterator(it, split1.getExactSizeIfKnown(),
            split1.characteristics());
    return StreamSupport.stream(split, false);
}