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:co.paralleluniverse.galaxy.core.BackupImpl.java

@Override
public Iterator<BACKUP> iterOwned() {
    final Iterator<Cache.CacheLine> it = cache.ownedIterator();
    return new Iterator<BACKUP>() {
        @Override//  w w  w .ja v  a  2s  .  c o m
        public boolean hasNext() {
            return it.hasNext();
        }

        @Override
        public BACKUP next() {
            final Cache.CacheLine line = it.next();
            synchronized (line) {
                monitor.addReplicationBackup(1);
                return (BACKUP) Message.BACKUP(line.getId(), line.getVersion(), line.getData())
                        .cloneDataBuffers();
            }
        }

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

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From source file:edu.jhuapl.openessence.datasource.jdbc.JdbcOeDataSource.java

protected <T> Collection<T> getDimension(final Collection<DimensionBean> beans, final DimBeanExec<T> ctr) {
    return new AbstractCollection<T>() {

        @Override/*from   www  .ja  v a 2  s.  com*/
        public Iterator<T> iterator() {
            return new Iterator<T>() {
                private Iterator<DimensionBean> beanIt = beans.iterator();

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

                @Override
                public T next() {
                    return ctr.exec(beanIt.next());
                }

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

        @Override
        public int size() {
            return beans.size();
        }
    };
}

---

From source file:org.apache.solr.handler.dataimport.XPathEntityProcessor.java

private Iterator<Map<String, Object>> getRowIterator(final Reader data, final String s) {
    //nothing atomic about it. I just needed a StongReference
    final AtomicReference<Exception> exp = new AtomicReference<>();
    final BlockingQueue<Map<String, Object>> blockingQueue = new ArrayBlockingQueue<>(blockingQueueSize);
    final AtomicBoolean isEnd = new AtomicBoolean(false);
    final AtomicBoolean throwExp = new AtomicBoolean(true);
    publisherThread = new Thread() {
        @Override/*from   w  w w . j  ava  2 s .c  o  m*/
        public void run() {
            try {
                xpathReader.streamRecords(data, (record, xpath) -> {
                    if (isEnd.get()) {
                        throwExp.set(false);
                        //To end the streaming . otherwise the parsing will go on forever
                        //though consumer has gone away
                        throw new RuntimeException("BREAK");
                    }
                    Map<String, Object> row;
                    try {
                        row = readRow(record, xpath);
                    } catch (Exception e) {
                        isEnd.set(true);
                        return;
                    }
                    offer(row);
                });
            } catch (Exception e) {
                if (throwExp.get())
                    exp.set(e);
            } finally {
                closeIt(data);
                if (!isEnd.get()) {
                    offer(END_MARKER);
                }
            }
        }

        private void offer(Map<String, Object> row) {
            try {
                while (!blockingQueue.offer(row, blockingQueueTimeOut, blockingQueueTimeOutUnits)) {
                    if (isEnd.get())
                        return;
                    LOG.debug("Timeout elapsed writing records.  Perhaps buffer size should be increased.");
                }
            } catch (InterruptedException e) {
                return;
            } finally {
                synchronized (this) {
                    notifyAll();
                }
            }
        }
    };

    publisherThread.start();

    return new Iterator<Map<String, Object>>() {
        private Map<String, Object> lastRow;
        int count = 0;

        @Override
        public boolean hasNext() {
            return !isEnd.get();
        }

        @Override
        public Map<String, Object> next() {
            Map<String, Object> row;

            do {
                try {
                    row = blockingQueue.poll(blockingQueueTimeOut, blockingQueueTimeOutUnits);
                    if (row == null) {
                        LOG.debug("Timeout elapsed reading records.");
                    }
                } catch (InterruptedException e) {
                    LOG.debug("Caught InterruptedException while waiting for row.  Aborting.");
                    isEnd.set(true);
                    return null;
                }
            } while (row == null);

            if (row == END_MARKER) {
                isEnd.set(true);
                if (exp.get() != null) {
                    String msg = "Parsing failed for xml, url:" + s + " rows processed in this xml:" + count;
                    if (lastRow != null)
                        msg += " last row in this xml:" + lastRow;
                    if (ABORT.equals(onError)) {
                        wrapAndThrow(SEVERE, exp.get(), msg);
                    } else if (SKIP.equals(onError)) {
                        wrapAndThrow(DataImportHandlerException.SKIP, exp.get());
                    } else {
                        LOG.warn(msg, exp.get());
                    }
                }
                return null;
            }
            count++;
            return lastRow = row;
        }

        @Override
        public void remove() {
            /*no op*/
        }
    };

}

---

From source file:org.languagetool.AnalyzedTokenReadings.java

/**
 * @since 2.3// w  w w  .j  ava2  s  .co  m
 */
@Override
public Iterator<AnalyzedToken> iterator() {
    AtomicInteger i = new AtomicInteger(0);
    return new Iterator<AnalyzedToken>() {
        @Override
        public boolean hasNext() {
            return i.get() < getReadingsLength();
        }

        @Override
        public AnalyzedToken next() {
            try {
                return anTokReadings[i.getAndAdd(1)];
            } catch (ArrayIndexOutOfBoundsException e) {
                throw new NoSuchElementException(
                        "No such element: " + i + ", element count: " + anTokReadings.length);
            }
        }

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

---

From source file:com.hs.mail.mailet.RemoteDelivery.java

private static Iterator<HostAddress> getGatewaySmtpHostAddresses(final String gateway) {
    return new Iterator<HostAddress>() {
        private Iterator<HostAddress> addresses = null;

        public boolean hasNext() {
            if (addresses == null) {
                String server = gateway;
                String port = "25";

                int idx = server.indexOf(':');
                if (idx > 0) {
                    port = server.substring(idx + 1);
                    server = server.substring(0, idx);
                }//from   w ww .j  a  v a  2s.c  om

                final String nextGateway = server;
                final String nextGatewayPort = port;
                try {
                    final InetAddress[] ips = DnsServer.getAllByName(nextGateway);
                    addresses = new Iterator<HostAddress>() {
                        private InetAddress[] ipAddresses = ips;
                        int i = 0;

                        public boolean hasNext() {
                            return i < ipAddresses.length;
                        }

                        public HostAddress next() {
                            return new HostAddress(nextGateway,
                                    "smtp://" + (ipAddresses[i++]).getHostAddress() + ":" + nextGatewayPort);
                        }

                        public void remove() {
                            throw new UnsupportedOperationException("remove not supported by this iterator");
                        }
                    };
                } catch (UnknownHostException uhe) {
                    logger.error("Unknown gateway host: " + uhe.getMessage().trim());
                    logger.error("This could be a DNS server error or configuration error.");
                }
            }
            return addresses != null && addresses.hasNext();
        }

        public HostAddress next() {
            return addresses != null ? addresses.next() : null;
        }

        public void remove() {
            throw new UnsupportedOperationException("remove not supported by this iterator");
        }
    };
}

---

From source file:edu.byu.nlp.crowdsourcing.models.gibbs.BlockCollapsedMultiAnnModelMath.java

public static Iterable<Prediction> predictions(final Dataset data, final int y[],
        final Map<String, Integer> instanceMap) {
    return new Iterable<Prediction>() {

        @Override//  w  ww .j  a v a  2  s  . c  o m
        public Iterator<Prediction> iterator() {
            return new Iterator<Prediction>() {

                // only predict on unlabeled portion of dataset; the labeled portion is known
                private Iterator<DatasetInstance> it = data.iterator();

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

                @Override
                public Prediction next() {
                    DatasetInstance instance = it.next();
                    // prediction based on most recent sample
                    Integer prediction = null;
                    if (instanceMap.containsKey(instance.getInfo().getRawSource())) {
                        prediction = y[instanceMap.get(instance.getInfo().getRawSource())];
                    }
                    return new BasicPrediction(prediction, instance);
                }

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

---

From source file:com.github.jsonj.JsonArray.java

/**
 * Convenience method to prevent casting JsonElement to JsonArray when iterating in the common case that you have
 * an array of JsonArrays./*from w  w  w  . j av a2 s .co  m*/
 *
 * @return iterable that iterates over JsonArrays instead of JsonElements.
 */
public Iterable<JsonArray> arrays() {
    final JsonArray parent = this;
    return new Iterable<JsonArray>() {

        @Override
        public Iterator<JsonArray> iterator() {
            final Iterator<JsonElement> iterator = parent.iterator();
            return new Iterator<JsonArray>() {

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

                @Override
                public JsonArray next() {
                    return iterator.next().asArray();
                }

                @Override
                public void remove() {
                    iterator.remove();
                }
            };
        }
    };
}

---

From source file:edu.jhuapl.openessence.datasource.jdbc.JdbcOeDataSource.java

protected <T> Collection<T> getAccumulation(final Collection<DimensionBean> beans, final DimBeanExec<T> ctr) {
    return new AbstractCollection<T>() {

        @Override//ww w.  j  av a2s . c  o  m
        public Iterator<T> iterator() {
            return new Iterator<T>() {
                private Iterator<DimensionBean> beanIt = beans.iterator();

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

                @Override
                public T next() {
                    return ctr.exec(beanIt.next());
                }

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

        @Override
        public int size() {
            return beans.size();
        }
    };
}

---

From source file:gobblin.couchbase.writer.CouchbaseWriterTest.java

@Test
public void testMultiTupleDocumentWrite()
        throws IOException, DataConversionException, ExecutionException, InterruptedException {
    CouchbaseWriter writer = new CouchbaseWriter(_couchbaseEnvironment, ConfigFactory.empty());
    try {// w w  w.jav  a2  s. com

        final Schema dataRecordSchema = SchemaBuilder.record("Data").fields().name("data").type().bytesType()
                .noDefault().name("flags").type().intType().noDefault().endRecord();

        final Schema schema = SchemaBuilder.record("TestRecord").fields().name("key").type().stringType()
                .noDefault().name("data").type(dataRecordSchema).noDefault().endRecord();

        final int numRecords = 1000;
        int outstandingRequests = 99;

        Iterator<GenericRecord> recordIterator = new Iterator<GenericRecord>() {
            private int currentIndex;

            @Override
            public void remove() {
            }

            @Override
            public boolean hasNext() {
                return (currentIndex < numRecords);
            }

            @Override
            public GenericRecord next() {
                GenericData.Record testRecord = new GenericData.Record(schema);

                String testContent = "hello world" + currentIndex;
                GenericData.Record dataRecord = new GenericData.Record(dataRecordSchema);
                dataRecord.put("data", ByteBuffer.wrap(testContent.getBytes(Charset.forName("UTF-8"))));
                dataRecord.put("flags", 0);

                testRecord.put("key", "hello" + currentIndex);
                testRecord.put("data", dataRecord);
                currentIndex++;
                return testRecord;
            }
        };

        long kvTimeout = 10000;
        TimeUnit kvTimeoutUnit = TimeUnit.MILLISECONDS;
        writeRecords(new TupleDocumentIterator(recordIterator), writer, outstandingRequests, kvTimeout,
                kvTimeoutUnit);
    } finally {
        writer.close();
    }
}

---

From source file:org.apache.solr.handler.dataimport.processor.XPathEntityProcessor.java

private Iterator<Map<String, Object>> getRowIterator(final Reader data, final String s) {
    //nothing atomic about it. I just needed a StongReference
    final AtomicReference<Exception> exp = new AtomicReference<Exception>();
    final BlockingQueue<Map<String, Object>> blockingQueue = new ArrayBlockingQueue<Map<String, Object>>(
            blockingQueueSize);/* w w  w  .  j  a  va 2 s  . co  m*/
    final AtomicBoolean isEnd = new AtomicBoolean(false);
    final AtomicBoolean throwExp = new AtomicBoolean(true);
    publisherThread = new Thread() {
        @Override
        public void run() {
            try {
                xpathReader.streamRecords(data, new XPathRecordReader.Handler() {
                    @Override
                    @SuppressWarnings("unchecked")
                    public void handle(Map<String, Object> record, String xpath) {
                        if (isEnd.get()) {
                            throwExp.set(false);
                            //To end the streaming . otherwise the parsing will go on forever
                            //though consumer has gone away
                            throw new RuntimeException("BREAK");
                        }
                        Map<String, Object> row;
                        try {
                            row = readRow(record, xpath);
                        } catch (final Exception e) {
                            isEnd.set(true);
                            return;
                        }
                        offer(row);
                    }
                });
            } catch (final Exception e) {
                if (throwExp.get())
                    exp.set(e);
            } finally {
                closeIt(data);
                if (!isEnd.get()) {
                    offer(END_MARKER);
                }
            }
        }

        private void offer(Map<String, Object> row) {
            try {
                while (!blockingQueue.offer(row, blockingQueueTimeOut, blockingQueueTimeOutUnits)) {
                    if (isEnd.get())
                        return;
                    LOG.debug("Timeout elapsed writing records.  Perhaps buffer size should be increased.");
                }
            } catch (final InterruptedException e) {
                return;
            } finally {
                synchronized (this) {
                    notifyAll();
                }
            }
        }
    };

    publisherThread.start();

    return new Iterator<Map<String, Object>>() {
        private Map<String, Object> lastRow;
        int count = 0;

        @Override
        public boolean hasNext() {
            return !isEnd.get();
        }

        @Override
        public Map<String, Object> next() {
            Map<String, Object> row;

            do {
                try {
                    row = blockingQueue.poll(blockingQueueTimeOut, blockingQueueTimeOutUnits);
                    if (row == null) {
                        LOG.debug("Timeout elapsed reading records.");
                    }
                } catch (final InterruptedException e) {
                    LOG.debug("Caught InterruptedException while waiting for row.  Aborting.");
                    isEnd.set(true);
                    return null;
                }
            } while (row == null);

            if (row == END_MARKER) {
                isEnd.set(true);
                if (exp.get() != null) {
                    String msg = "Parsing failed for xml, url:" + s + " rows processed in this xml:" + count;
                    if (lastRow != null)
                        msg += " last row in this xml:" + lastRow;
                    if (ABORT.equals(onError)) {
                        wrapAndThrow(SEVERE, exp.get(), msg);
                    } else if (SKIP.equals(onError)) {
                        wrapAndThrow(DataImportHandlerException.SKIP, exp.get());
                    } else {
                        LOG.warn(msg, exp.get());
                    }
                }
                return null;
            }
            count++;
            return lastRow = row;
        }

        @Override
        public void remove() {
            /*no op*/
        }
    };

}

---

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