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:com.datasayer.meerkat.MeerJobRunner.java

@SuppressWarnings("unchecked")
@Override//  w w w .jav a  2s.  c  o m
public void bsp(final BSPPeer<Writable, Writable, Writable, Writable, Writable> peer)
        throws IOException, SyncException, InterruptedException {

    while (true) {
        try {
            long currentTime = System.currentTimeMillis();
            FileSystem fs = FileSystem.get(conf);
            if (!fs.isFile(logPath)) {
                System.out.println("can not read input file");
                return;
            }
            RandomAccessFile file = new RandomAccessFile(logPath.toString(), "r");
            long fileLength = file.length();

            if (fileLength > filePointer) {
                file.seek(filePointer);
                String line = null;
                while (file.length() > file.getFilePointer()) {
                    line = file.readLine();
                    line = new String(line.getBytes("8859_1"), "utf-8");
                    guardMeer.observe(line);
                }
                filePointer = file.getFilePointer();
            } else {
                // nothing to do
            }
            file.close();

            long timeDiff = currentTime - this.lastAggregatedTime;
            if (timeDiff >= this.aggregationInterval) {

                peer.sync();

                if (peer.getPeerName().equals(masterName)) {
                    bossMeer.masterCompute(new Iterator<Writable>() {

                        private final int producedMessages = peer.getNumCurrentMessages();
                        private int consumedMessages = 0;

                        @Override
                        public boolean hasNext() {
                            return producedMessages > consumedMessages;
                        }

                        @Override
                        public Writable next() throws NoSuchElementException {
                            if (consumedMessages >= producedMessages) {
                                throw new NoSuchElementException();
                            }

                            try {
                                consumedMessages++;
                                return peer.getCurrentMessage();
                            } catch (IOException e) {
                                throw new NoSuchElementException();
                            }
                        }

                        @Override
                        public void remove() {
                            // BSPPeer.getCurrentMessage originally deletes a message.
                            // Thus, it doesn't need to throw exception.
                            // throw new UnsupportedOperationException();
                        }

                    }, signalMeer);
                    this.lastAggregatedTime = currentTime;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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From source file:org.apache.hadoop.hbase.io.encoding.EncodedDataBlock.java

/**
 * Provides access to compressed value./*from   w w w .  j a  v  a 2 s  .  c  o  m*/
 * @param headerSize header size of the block.
 * @return Forwards sequential iterator.
 */
public Iterator<Cell> getIterator(int headerSize) {
    final int rawSize = rawKVs.length;
    byte[] encodedDataWithHeader = getEncodedData();
    int bytesToSkip = headerSize + Bytes.SIZEOF_SHORT;
    ByteArrayInputStream bais = new ByteArrayInputStream(encodedDataWithHeader, bytesToSkip,
            encodedDataWithHeader.length - bytesToSkip);
    final DataInputStream dis = new DataInputStream(bais);

    return new Iterator<Cell>() {
        private ByteBuffer decompressedData = null;

        @Override
        public boolean hasNext() {
            if (decompressedData == null) {
                return rawSize > 0;
            }
            return decompressedData.hasRemaining();
        }

        @Override
        public Cell next() {
            if (decompressedData == null) {
                try {
                    decompressedData = dataBlockEncoder.decodeKeyValues(dis,
                            dataBlockEncoder.newDataBlockDecodingContext(meta));
                } catch (IOException e) {
                    throw new RuntimeException("Problem with data block encoder, "
                            + "most likely it requested more bytes than are available.", e);
                }
                decompressedData.rewind();
            }
            int offset = decompressedData.position();
            int klen = decompressedData.getInt();
            int vlen = decompressedData.getInt();
            short tagsLen = 0;
            ByteBufferUtils.skip(decompressedData, klen + vlen);
            // Read the tag length in case when steam contain tags
            if (meta.isIncludesTags()) {
                tagsLen = decompressedData.getShort();
                ByteBufferUtils.skip(decompressedData, tagsLen);
            }
            KeyValue kv = new KeyValue(decompressedData.array(), offset,
                    (int) KeyValue.getKeyValueDataStructureSize(klen, vlen, tagsLen));
            if (meta.isIncludesMvcc()) {
                long mvccVersion = ByteBufferUtils.readVLong(decompressedData);
                kv.setMvccVersion(mvccVersion);
            }
            return kv;
        }

        @Override
        public void remove() {
            throw new NotImplementedException("remove() is not supported!");
        }

        @Override
        public String toString() {
            return "Iterator of: " + dataBlockEncoder.getClass().getName();
        }

    };
}

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From source file:com.android.messaging.datamodel.data.ConversationParticipantsData.java

@Override
public Iterator<ParticipantData> iterator() {
    return new Iterator<ParticipantData>() {
        private int mCurrentIndex = -1;

        @Override//from w  w  w  . j  av  a2s . co  m
        public boolean hasNext() {
            return mCurrentIndex < mConversationParticipantsMap.size() - 1;
        }

        @Override
        public ParticipantData next() {
            mCurrentIndex++;
            if (mCurrentIndex >= mConversationParticipantsMap.size()) {
                throw new NoSuchElementException();
            }
            return mConversationParticipantsMap.valueAt(mCurrentIndex);
        }

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

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From source file:org.jboss.dashboard.ui.taglib.formatter.ForFormatter.java

public void service(HttpServletRequest request, HttpServletResponse response) throws FormatterException {
    log.debug("Servicing ForFormatter.");
    Object array = getParameter("array");
    if (array == null) {
        Object componentName = getParameter("factoryElement");
        Object propertyName = getParameter("property");
        if (componentName != null) {
            Object component = Factory.lookup((String) componentName);
            array = component;/* ww w.  jav a2  s  .  c o m*/
            if (propertyName != null) {
                JXPathContext ctx = JXPathContext.newContext(component);
                try {
                    array = ctx.getValue((String) propertyName);
                } catch (Exception e) {
                    log.debug("Error:", e);
                }
            }
        }
    }
    String sortProperties = (String) getParameter("sortProperties");

    Iterator iterator = null;
    if (array == null) {
        renderFragment("empty");
        return;
    }

    if (array instanceof Collection) {
        iterator = ((Collection) array).iterator();
    } else if (array.getClass().isArray()) {
        final Object theArray = array;
        iterator = new Iterator() {
            int index = 0;

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

            public boolean hasNext() {
                return Array.getLength(theArray) > index;
            }

            public Object next() {
                return Array.get(theArray, index++);
            }
        };
    } else if (array instanceof Iterator) {
        iterator = (Iterator) array;
    } else if (array instanceof Enumeration) {
        List l = new ArrayList();
        while (((Enumeration) array).hasMoreElements()) {
            l.add(((Enumeration) array).nextElement());
        }
        iterator = l.iterator();
    }

    if (sortProperties != null) {
        iterator = getSortedIterator(iterator, sortProperties);
    }

    if (iterator != null && iterator.hasNext()) {
        renderFragment("outputStart");
        int i = 0;
        while (iterator.hasNext()) {
            Object o = iterator.next();
            setAttribute("index", new Integer(i));
            setAttribute("count", new Integer(++i));
            if (o != null)
                setAttribute("element", o);
            else
                setAttribute("element", getParameter("nullValue"));
            renderFragment("output");
        }
        renderFragment("outputEnd");
    } else {
        renderFragment("empty");
    }
}

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From source file:de.speexx.csv.table.CsvReader.java

@Override
public Iterator<Row> iterator() {
    return new Iterator<Row>() {
        @Override/*from ww  w  .  j  a va  2 s .com*/
        public boolean hasNext() {
            return CsvReader.this.itr.hasNext();
        }

        @Override
        public Row next() {
            final CSVRecord record = CsvReader.this.itr.next();
            final List<Entry> entries = new ArrayList<>();

            CsvReader.this.descriptors.stream().forEach((desc) -> {
                final String value = record.get(desc.getName());
                final SimpleEntry<String> entry = new SimpleEntry<>(value, desc);
                entries.add(entry);
            });

            return new SimpleRow(entries);
        }
    };
}

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From source file:com.px100systems.util.CsvParser.java

/**
 * Parsing into a list of maps of fields (requires header)
 *
 * @param is imput stream/*from w  w w. ja v a2  s.c  om*/
 * @return List of maps of {field, value} pairs
 */
public Iterator<Map<String, String>> parseAsMap(InputStream is) {
    final CSVParser parser = new CSVParser(new BufferedReader(new InputStreamReader(is)), csvStrategy);
    try {
        header = parser.getLine();
        return new Iterator<Map<String, String>>() {
            @Override
            public boolean hasNext() {
                try {
                    currentLine = parser.getLine();
                    return currentLine != null;
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }

            @Override
            public Map<String, String> next() {
                Map<String, String> row = new HashMap<String, String>();
                for (int i = 0; i < header.length; i++)
                    row.put(header[i], currentLine[i]);
                return row;
            }
        };
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:FileSerializeCollection.java

public Iterator<Type> iterator() {
    try {//  w  w w .  ja  v  a 2  s  .  c o  m
        oos.flush();
        return new Iterator<Type>() {

            private Type next = null;

            private final ObjectInputStream ois = new ObjectInputStream(
                    new BufferedInputStream(new FileInputStream(file)));

            @SuppressWarnings("unchecked")
            public boolean hasNext() {
                try {
                    if (next == null) {
                        next = (Type) ois.readObject();
                    }
                } catch (final EOFException eof) {
                    // do not report exception
                } catch (final Exception e) {
                    System.err.println(e);
                }

                try {
                    if (next == null) {
                        ois.close();
                    }
                } catch (final IOException io) {
                    System.err.println(io);
                }

                return (next != null);
            }

            public Type next() {
                if (hasNext()) {
                    final Type ret = next;
                    next = null;
                    return ret;
                }
                throw new NoSuchElementException("No more elements");
            }

            public void remove() {
                throw new UnsupportedOperationException("remove not supported in DumpSet$iterator()");
            }
        };
    } catch (final IOException io) {
        System.err.println(io);
    }
    return null;
}

---

From source file:org.apache.sling.nosql.generic.simple.provider.SimpleNoSqlAdapter.java

public Iterator<NoSqlData> query(String query, String language) {
    // implement simple dummy query
    if (StringUtils.equals(language, "simple") && StringUtils.equals(query, "all")) {
        final Iterator<Entry<String, Map<String, Object>>> entries = store.entrySet().iterator();
        return new Iterator<NoSqlData>() {
            public boolean hasNext() {
                return entries.hasNext();
            }/*from w w w  .j  a  v a  2 s.  c o  m*/

            public NoSqlData next() {
                Entry<String, Map<String, Object>> entry = entries.next();
                return new NoSqlData(entry.getKey(), entry.getValue());
            }

            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    }
    return Collections.<NoSqlData>emptyList().iterator();
}

---

From source file:org.jboss.dashboard.ui.formatters.ForFormatter.java

public void service(HttpServletRequest request, HttpServletResponse response) throws FormatterException {
    log.debug("Servicing ForFormatter.");
    Object array = getParameter("array");
    if (array == null) {
        Object componentName = getParameter("factoryElement");
        Object propertyName = getParameter("property");
        if (componentName != null) {
            Object component = CDIBeanLocator.getBeanByNameOrType((String) componentName);
            array = component;//from  ww  w .j  a v a 2s .c  o m
            if (propertyName != null) {
                JXPathContext ctx = JXPathContext.newContext(component);
                try {
                    array = ctx.getValue((String) propertyName);
                } catch (Exception e) {
                    log.debug("Error:", e);
                }
            }
        }
    }
    String sortProperties = (String) getParameter("sortProperties");

    Iterator iterator = null;
    if (array == null) {
        renderFragment("empty");
        return;
    }

    if (array instanceof Collection) {
        iterator = ((Collection) array).iterator();
    } else if (array.getClass().isArray()) {
        final Object theArray = array;
        iterator = new Iterator() {
            int index = 0;

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

            public boolean hasNext() {
                return Array.getLength(theArray) > index;
            }

            public Object next() {
                return Array.get(theArray, index++);
            }
        };
    } else if (array instanceof Iterator) {
        iterator = (Iterator) array;
    } else if (array instanceof Enumeration) {
        List l = new ArrayList();
        while (((Enumeration) array).hasMoreElements()) {
            l.add(((Enumeration) array).nextElement());
        }
        iterator = l.iterator();
    }

    if (sortProperties != null) {
        iterator = getSortedIterator(iterator, sortProperties);
    }

    if (iterator != null && iterator.hasNext()) {
        renderFragment("outputStart");
        int i = 0;
        while (iterator.hasNext()) {
            Object o = iterator.next();
            setAttribute("index", new Integer(i));
            setAttribute("count", new Integer(++i));
            if (o != null)
                setAttribute("element", o);
            else
                setAttribute("element", getParameter("nullValue"));
            renderFragment("output");
        }
        renderFragment("outputEnd");
    } else {
        renderFragment("empty");
    }
}

---

From source file:jetbrains.exodus.util.BackupBean.java

@Override
public BackupStrategy getBackupStrategy() {
    final int targetsCount = targets.length;
    final BackupStrategy[] wrapped = new BackupStrategy[targetsCount];
    for (int i = 0; i < targetsCount; i++) {
        wrapped[i] = targets[i].getBackupStrategy();
    }//  ww  w  .j av  a  2s  .  com
    return new BackupStrategy() {
        @Override
        public void beforeBackup() throws Exception {
            backupStartTicks = System.currentTimeMillis();
            log.info("Backing up database...");
            for (final BackupStrategy strategy : wrapped) {
                strategy.beforeBackup();
            }
        }

        @Override
        public Iterable<FileDescriptor> listFiles() {
            return new Iterable<FileDescriptor>() {
                @Override
                public Iterator<FileDescriptor> iterator() {
                    return new Iterator<FileDescriptor>() {

                        @Nullable
                        private FileDescriptor next = null;
                        private int i = 0;
                        @NotNull
                        private Iterator<FileDescriptor> it = EMPTY.listFiles().iterator();

                        @Override
                        public boolean hasNext() {
                            return getNext() != null;
                        }

                        @Override
                        public FileDescriptor next() {
                            try {
                                return getNext();
                            } finally {
                                next = null;
                            }
                        }

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

                        private FileDescriptor getNext() {
                            if (next == null) {
                                while (!it.hasNext()) {
                                    if (i >= targetsCount) {
                                        return next;
                                    }
                                    it = wrapped[i++].listFiles().iterator();
                                }
                                next = it.next();
                            }
                            return next;
                        }
                    };
                }
            };
        }

        @Override
        public void afterBackup() throws Exception {
            try {
                for (final BackupStrategy strategy : wrapped) {
                    strategy.afterBackup();
                }
            } finally {
                backupStartTicks = 0;
            }
            if (commandAfterBackup != null) {
                log.info("Executing \"" + commandAfterBackup + "\"...");
                //noinspection CallToRuntimeExecWithNonConstantString,CallToRuntimeExec
                Runtime.getRuntime().exec(commandAfterBackup);
            }
            log.info("Backup finished.");
        }

        @Override
        public void onError(Throwable t) {
            backupException = t;
        }
    };
}

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