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.zextras.modules.chat.server.history.HistoryMailManager.java

private Iterator<Item> buildQueryResultsIterator(final QueryResults queryResults) {
    return new Iterator<Item>() {
        @Override//from www .  j  a v a2 s. c  o  m
        public boolean hasNext() {
            return queryResults.hasNext();
        }

        @Override
        public Item next() {
            return queryResults.getNext().getMailItem();
        }

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

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From source file:CircularQueue.java

public Iterator iterator() {
    return new Iterator() {
        private final int ci = consumerIndex;
        private final int pi = producerIndex;
        private int s = size;
        private int i = ci;

        public boolean hasNext() {
            checkForModification();//from w  ww .j  a va  2s .  c o m
            return s > 0;
        }

        public Object next() {
            checkForModification();
            if (s == 0)
                throw new NoSuchElementException();

            s--;
            Object r = q[i];
            i = (i + 1) & bitmask;

            return r;
        }

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

        private void checkForModification() {
            if (ci != consumerIndex)
                throw new ConcurrentModificationException();
            if (pi != producerIndex)
                throw new ConcurrentModificationException();
        }
    };
}

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From source file:com.github.nukesparrow.htmlunit.HUQueryElements.java

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

        int index = -1;

        @Override//  w ww . j  a  v  a  2 s.  co  m
        public boolean hasNext() {
            return index + 1 < elements.size();
        }

        @Override
        public HUQueryElements<Elem> next() {
            index++;
            return new HUQueryElements(w, elements.get(index));
        }
    };
}

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From source file:act.installer.GenbankInstaller.java

public static void main(String[] args) throws Exception {
    Options opts = new Options();
    for (Option.Builder b : OPTION_BUILDERS) {
        opts.addOption(b.build());/*ww  w  . ja v a 2 s  .  c om*/
    }

    CommandLine cl = null;
    try {
        CommandLineParser parser = new DefaultParser();
        cl = parser.parse(opts, args);
    } catch (ParseException e) {
        LOGGER.error("Argument parsing failed: %s", e.getMessage());
        HELP_FORMATTER.printHelp(GenbankInstaller.class.getCanonicalName(), HELP_MESSAGE, opts, null, true);
        System.exit(1);
    }

    if (cl.hasOption("help")) {
        HELP_FORMATTER.printHelp(GenbankInstaller.class.getCanonicalName(), HELP_MESSAGE, opts, null, true);
        System.exit(1);
    }

    File genbankFile = new File(cl.getOptionValue(OPTION_GENBANK_PATH));
    String dbName = cl.getOptionValue(OPTION_DB_NAME);
    String seqType = cl.getOptionValue(OPTION_SEQ_TYPE);

    if (!genbankFile.exists()) {
        String msg = String.format("Genbank file path is null");
        LOGGER.error(msg);
        throw new RuntimeException(msg);
    } else {
        MongoDB db = new MongoDB("localhost", 27017, dbName);

        DBIterator iter = db.getDbIteratorOverOrgs();

        Iterator<Organism> orgIterator = new Iterator<Organism>() {
            @Override
            public boolean hasNext() {
                boolean hasNext = iter.hasNext();
                if (!hasNext)
                    iter.close();
                return hasNext;
            }

            @Override
            public Organism next() {
                DBObject o = iter.next();
                return db.convertDBObjectToOrg(o);
            }

        };

        OrgMinimalPrefixGenerator prefixGenerator = new OrgMinimalPrefixGenerator(orgIterator);
        Map<String, String> minimalPrefixMapping = prefixGenerator.getMinimalPrefixMapping();

        GenbankInstaller installer = new GenbankInstaller(genbankFile, seqType, db, minimalPrefixMapping);
        installer.init();
    }

}

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From source file:org.apache.pig.tools.pigstats.OutputStats.java

public Iterator<Tuple> iterator() throws IOException {
    final LoadFunc p;
    PigContext pigContext = ScriptState.get().getPigContext();
    if (pigContext == null || store == null) {
        throw new IllegalArgumentException();
    }//from  w  w  w  .  j a  v a  2 s  .co  m
    try {
        LoadFunc originalLoadFunc = (LoadFunc) PigContext
                .instantiateFuncFromSpec(store.getSFile().getFuncSpec());

        p = (LoadFunc) new ReadToEndLoader(originalLoadFunc,
                ConfigurationUtil.toConfiguration(pigContext.getProperties()), store.getSFile().getFileName(),
                0);

    } catch (Exception e) {
        int errCode = 2088;
        String msg = "Unable to get results for: " + store.getSFile();
        throw new ExecException(msg, errCode, PigException.BUG, e);
    }

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

        @Override
        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;
                throw new Error(e);
            }
            return !atEnd;
        }

        @Override
        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;
        }

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

    };
}

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From source file:org.paxml.bean.excel.ReadExcelTag.java

private Iterator doBasic(Context context) throws Exception {

    return new Iterator() {
        private Iterator<Row> it;
        private int index;
        private Map<Integer, String> headers = new HashMap<Integer, String>();

        private void start() {

            boolean ok = false;
            try {

                Sheet s = getExcelSheet(false);

                it = s.iterator();/*from   w ww .j  a  v  a  2  s.  c  o m*/
                // find the start row
                if (log.isDebugEnabled()) {
                    log.debug("Start reading from row " + Math.max(1, firstRow) + " of sheet: "
                            + s.getSheetName());
                }

                for (int i = 1; i < firstRow && it.hasNext(); i++) {
                    it.next();
                    index++;
                }

                ok = true;
            } finally {
                if (!ok) {
                    end();
                }
            }
        }

        private void end() {
            it = null;
            file.close();
        }

        @Override
        public boolean hasNext() {
            if (it == null) {
                start();
            }
            if (lastRow > 0 && index > lastRow - 1) {
                end();
                return false;
            }
            try {
                boolean has = it.hasNext();
                if (!has) {
                    end();
                }
                return has;
            } catch (Exception e) {
                end();
                throw new PaxmlRuntimeException(e);
            }
        }

        @Override
        public Object next() {
            try {
                Row row = it.next();
                Object r = readRow(row);
                index++;
                return r;
            } catch (Exception e) {
                end();
                throw new PaxmlRuntimeException(e);
            }
        }

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

        private Map<Object, Object> readRow(Row row) {

            final int firstCell = Math.max(row.getFirstCellNum(), _firstColumn);
            final int lastCell = _lastColumn < 0 ? row.getLastCellNum() - 1
                    : Math.min(row.getLastCellNum() - 1, _lastColumn);

            if (log.isDebugEnabled()) {
                log.debug("Reading cells: " + new CellReference(index, firstCell).formatAsString() + ":"
                        + new CellReference(index, lastCell).formatAsString());
            }

            Map<Object, Object> result = new LinkedHashMap<Object, Object>();
            for (int i = firstCell; i <= lastCell; i++) {
                Cell cell = row.getCell(i);
                if (cell != null) {
                    Object value = file.getCellValue(cell);
                    // dual keys for the same value
                    result.put(i, value);
                    String key = headers.get(i);
                    if (key == null) {
                        key = new CellReference(-1, i).formatAsString();
                        headers.put(i, key);
                    }
                    result.put(key, value);
                }
            }
            return result;
        }

    };

}

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From source file:com.wrmsr.kleist.util.Itertools.java

public static <T> Iterator<T> lazyIterator(Supplier<? extends T> supplier) {
    return new Iterator<T>() {
        private boolean done;

        @Override//from  w ww .j a  v a2  s  . c  om
        public boolean hasNext() {
            return !done;
        }

        @Override
        public T next() {
            if (done) {
                throw new IllegalStateException();
            }
            done = true;
            return supplier.get();
        }
    };
}

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From source file:org.libreplan.business.planner.limiting.entities.DateAndHour.java

/**
 * Creates an {@link Iterable} that returns a lazy iterator. If
 * <code>end</code> is <code>null</code> it will not stop and will keep on
 * producing days forever/*from w ww . j ava  2 s. c  om*/
 */
public Iterable<LocalDate> daysUntil(final DateAndHour end) {
    Validate.isTrue(end == null || end.isAfter(this));
    return new Iterable<LocalDate>() {
        @Override
        public Iterator<LocalDate> iterator() {
            return new Iterator<LocalDate>() {

                private LocalDate current = getDate();

                @Override
                public boolean hasNext() {
                    return end == null || end.isAfter(current);
                }

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

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

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From source file:org.apache.sling.discovery.impl.setup.MockedResourceResolver.java

public Iterator<Resource> listChildren(Resource parent) {
    try {/*from ww w . java 2 s .  c o  m*/
        Node node = parent.adaptTo(Node.class);
        final NodeIterator nodes = node.getNodes();
        return new Iterator<Resource>() {

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

            public Resource next() {
                Node next = nodes.nextNode();
                try {
                    return new MockedResource(MockedResourceResolver.this, next.getPath(), "nt:unstructured");
                } catch (RepositoryException e) {
                    throw new RuntimeException("RepositoryException: " + e, e);
                }
            }

            public boolean hasNext() {
                return nodes.hasNext();
            }
        };
    } catch (RepositoryException e) {
        throw new RuntimeException("RepositoryException: " + e, e);
    }
}

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From source file:org.apache.apex.malhar.lib.state.spillable.SpillableSetImpl.java

@Override
public Iterator<T> iterator() {
    return new Iterator<T>() {
        T cur = head;//from  w  ww .j a  va2 s.  c o  m
        T prev = null;

        @Override
        public boolean hasNext() {
            while (cur != null) {
                ListNode<T> node = map.get(cur);
                if (node.valid) {
                    return true;
                }
                if (cur.equals(node.next)) {
                    break;
                } else {
                    cur = node.next;
                }
            }
            return false;
        }

        @Override
        public T next() {
            while (cur != null) {
                ListNode<T> node = map.get(cur);
                try {
                    if (node.valid) {
                        prev = cur;
                        return prev;
                    }
                } finally {
                    if (cur.equals(node.next)) {
                        cur = null;
                    } else {
                        cur = node.next;
                    }
                }
            }
            throw new NoSuchElementException();
        }

        @Override
        public void remove() {
            ListNode<T> node = map.get(prev);
            node.valid = false;
            map.put(prev, node);
            size--;
        }
    };
}

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