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:net.javacoding.queue.DiskQueue.java

/**
 * @see org.archive.queue.Queue#getIterator(boolean)
 * @return iterator/* ww w. jav  a 2 s .c o  m*/
 */
public Iterator getIterator(boolean inCacheOnly) {
    // There are no levels of storage so we will return all items.
    Iterator it = null;

    if (isInitialized) {
        try {
            it = new DiskQueueIterator(bytes.getReadAllInputStream(), length);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    if (it == null) {
        it = new Iterator() {
            public void remove() {
                throw new UnsupportedOperationException();
            }

            public boolean hasNext() {
                return false;
            }

            public Object next() {
                throw new NoSuchElementException();
            }
        };
    }

    return it;
}

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From source file:org.kie.commons.java.nio.base.AbstractPath.java

@Override
public Iterator<Path> iterator() {
    return new Iterator<Path>() {
        private int i = 0;

        @Override// w w  w .j a va  2  s  .c o  m
        public boolean hasNext() {
            return i < getNameCount();
        }

        @Override
        public Path next() {
            if (i < getNameCount()) {
                Path result = getName(i);
                i++;
                return result;
            } else {
                throw new NoSuchElementException();
            }
        }

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

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From source file:org.apache.accumulo.core.util.Merge.java

protected Iterator<Size> getSizeIterator(Connector conn, String tablename, Text start, Text end)
        throws MergeException {
    // open up metatadata, walk through the tablets.
    String tableId;/*  ww  w .  j  a va 2  s  .  co  m*/
    Scanner scanner;
    try {
        tableId = Tables.getTableId(conn.getInstance(), tablename);
        scanner = conn.createScanner(MetadataTable.NAME, Authorizations.EMPTY);
    } catch (Exception e) {
        throw new MergeException(e);
    }
    scanner.setRange(new KeyExtent(new Text(tableId), end, start).toMetadataRange());
    scanner.fetchColumnFamily(DataFileColumnFamily.NAME);
    TabletsSection.TabletColumnFamily.PREV_ROW_COLUMN.fetch(scanner);
    final Iterator<Entry<Key, Value>> iterator = scanner.iterator();

    Iterator<Size> result = new Iterator<Size>() {
        Size next = fetch();

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

        private Size fetch() {
            long tabletSize = 0;
            while (iterator.hasNext()) {
                Entry<Key, Value> entry = iterator.next();
                Key key = entry.getKey();
                if (key.getColumnFamily().equals(DataFileColumnFamily.NAME)) {
                    String[] sizeEntries = new String(entry.getValue().get(), Constants.UTF8).split(",");
                    if (sizeEntries.length == 2) {
                        tabletSize += Long.parseLong(sizeEntries[0]);
                    }
                } else if (TabletsSection.TabletColumnFamily.PREV_ROW_COLUMN.hasColumns(key)) {
                    KeyExtent extent = new KeyExtent(key.getRow(), entry.getValue());
                    return new Size(extent, tabletSize);
                }
            }
            return null;
        }

        @Override
        public Size next() {
            Size result = next;
            next = fetch();
            return result;
        }

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

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From source file:net.jcreate.xkins.XkinsLoader.java

/**
 * Devuelve un Iterator con URL de cada configuration file
 * @return//from   w w w  .  j  ava 2s .com
 */
private Iterator getConfigFiles() {
    return new Iterator() {
        StringTokenizer st = new StringTokenizer(XkinsLoader.getConfig(), ",");

        public boolean hasNext() {
            return st.hasMoreTokens();
        }

        public Object next() {
            //tries to look for the file in the WEB-INF directory
            String configFile = st.nextToken().trim();
            URL url = null;
            try {
                if (servletContext != null) {//?web??,?
                    url = servletContext.getResource(configFile);
                }
                if (url == null) {
                    url = XkinsLoader.this.getClass().getResource(configFile);
                }
            } catch (MalformedURLException e) {
                url = XkinsLoader.this.getClass().getResource(configFile);
            }
            return url;
        }

        public void remove() {
        }
    };
}

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From source file:aarddict.Volume.java

Iterator<Entry> lookup(final LookupWord lookupWord, final Comparator<Entry> comparator) {
    if (lookupWord.isEmpty()) {
        return EMPTY_ITERATOR;
    }/*  www  .j  ava2 s.com*/

    final String section = lookupWord.section;
    final Entry lookupEntry = new Entry(this.getId(), lookupWord.word);
    final int initialIndex = binarySearch(this, lookupEntry, comparator);
    Iterator<Entry> iterator = new Iterator<Entry>() {

        int index = initialIndex;
        Entry nextEntry;

        {
            prepareNext();
        }

        private void prepareNext() {
            if (index < header.indexCount) {
                Entry matchedEntry = get(index);
                nextEntry = (0 == comparator.compare(matchedEntry, lookupEntry)) ? matchedEntry : null;
                index++;
            } else {
                nextEntry = null;
            }
        }

        public boolean hasNext() {
            return nextEntry != null;
        }

        public Entry next() {
            Entry current = nextEntry;
            current.section = section;
            prepareNext();
            return current;
        }

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

    return iterator;
}

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From source file:edu.ku.brc.specify.tasks.subpane.qb.ERTICaptionInfoTreeLevelGrp.java

/**
 * @param value/*from   w ww. j a va  2s.c om*/
 * @throws SQLException
 */
@SuppressWarnings("unchecked")
protected Object[] newValue(final Object value) throws SQLException {
    Object[] currentRanks = null;
    //synchronized(currentRanks) 
    //{
    if (useCache) {
        Object[] lookedUp = (Object[]) lookupCache.lookupKey((Integer) value);
        //AtomicReferenceArray<Object[]> lookedUp = (AtomicReferenceArray<Object[]>)lookupCache.lookupKey((Integer )value);
        if (lookedUp != null) {
            currentRanks = lookedUp;
            return currentRanks;
        }
    }
    if (currentRanks == null) {
        currentRanks = new Object[members.size()];
        //currentRanks = new AtomicReferenceArray<Object[]>(members.size());
        for (int r = 0; r < members.size(); r++) {
            currentRanks[r] = null;
            //currentRanks.set(r, null);
        }
    }
    //}
    ResultSet ancestorRows = null;
    Iterator<Object> ancestors = null;
    Pair<Integer, String[]> ancestor = null;
    Statement statement = null;
    if (useHibernate) {
        query.setParameter("descendantArg", value);
        ancestors = (Iterator<Object>) query.list().iterator();
    } else {
        String sql = setupQuery(value);
        statement = DBConnection.getInstance().getConnection().createStatement();
        final ResultSet rows = statement.executeQuery(sql);
        ancestorRows = rows;
        ancestors = new Iterator<Object>() {

            @Override
            public boolean hasNext() {
                try {
                    return rows.next();
                } catch (SQLException ex) {
                    return false;
                }
            }

            @Override
            public Object next() {
                try {
                    int arraySize = fieldsToRetrieve == null ? 2 : fieldsToRetrieve.size() + 1;
                    Object[] result = new Object[arraySize];
                    for (int c = 0; c < arraySize - 1; c++) {
                        result[c] = rows.getString(c + 1);
                    }
                    result[arraySize - 1] = Integer.valueOf(rows.getString(arraySize));
                    return result;
                } catch (SQLException ex) {
                    return null;
                }
            }

            @Override
            public void remove() {
                // ignore               
            }

        };

    }

    //XXX using a pair for ancestor will not work when fieldsToRetrieve is non null
    ancestor = ancestors.hasNext() ? getAncestorInfo(ancestors.next()) : null;
    //members are ordered by rank
    for (ERTICaptionInfoTreeLevel member : members) {
        //if (ancestor != null) System.out.println(ancestor.getFirst() + " " + member.getRank());
        while (ancestor != null && ancestor.getFirst() < member.getRank()) {
            ancestor = ancestors.hasNext() ? getAncestorInfo(ancestors.next()) : null;
        }
        if (ancestor != null && ancestor.getFirst() == member.getRank()) {
            currentRanks[member.getRankIdx()] = ancestor.getSecond();
            //currentRanks.
        } else {
            currentRanks[member.getRankIdx()] = null;
        }
    }
    if (ancestorRows != null) {
        ancestorRows.close();
    }
    if (statement != null) {
        statement.close();
    }

    //        if (useCache)
    //        {
    //            lookupCache.addKey((Integer )value, currentRanks);
    //        }
    return currentRanks;
}

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From source file:com.spotify.heroic.metric.astyanax.AstyanaxBackend.java

@Override
public Iterable<BackendEntry> listEntries() {
    final Borrowed<Context> ctx = context.borrow();

    final OperationResult<Rows<MetricsRowKey, Integer>> result;

    try {/*  www .  j a v  a  2s  .  c om*/
        result = ctx.get().client.prepareQuery(METRICS_CF).getAllRows().execute();
    } catch (final ConnectionException e) {
        throw new RuntimeException("Request failed", e);
    }

    return new Iterable<BackendEntry>() {
        @Override
        public Iterator<BackendEntry> iterator() {
            final Iterator<Row<MetricsRowKey, Integer>> iterator = result.getResult().iterator();

            return new Iterator<BackendEntry>() {
                @Override
                public boolean hasNext() {
                    final boolean next = iterator.hasNext();

                    if (!next) {
                        ctx.release();
                    }

                    return next;
                }

                @Override
                public BackendEntry next() {
                    final Row<MetricsRowKey, Integer> entry = iterator.next();
                    final MetricsRowKey rowKey = entry.getKey();
                    final Series series = rowKey.getSeries();

                    final List<Point> points = rowKey.buildPoints(entry.getColumns());
                    return new BackendEntry(series, MetricCollection.points(points));
                }

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

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From source file:com.quinsoft.zeidon.standardoe.ViewImpl.java

@Override
public Iterable<EntityInstance> getHierEntityList(boolean includeRoot, String entityName) {
    EntityDef entityDef = null;/*from ww w.  ja v  a  2  s  .  co  m*/
    if (!StringUtils.isBlank(entityName))
        entityDef = getLodDef().getEntityDef(entityName);

    ObjectInstance oi = viewCursor.getObjectInstance();
    final EntityIterator<EntityInstanceImpl> iter = new IteratorBuilder(getObjectInstance()).withOiScoping(oi)
            .forEntityDef(entityDef).setLazyLoad(true).build();

    // Skip the root?
    if (!includeRoot)
        iter.next();

    // We have to create an iterator so that we can set the cursor in next().
    return new Iterable<EntityInstance>() {
        @Override
        public Iterator<EntityInstance> iterator() {
            return new Iterator<EntityInstance>() {
                @Override
                public boolean hasNext() {
                    return iter.hasNext();
                }

                @Override
                public EntityInstance next() {
                    EntityInstanceImpl ei = iter.next();
                    EntityDef entityDef = ei.getEntityDef();
                    EntityCursorImpl entityCursor = viewCursor.getEntityCursor(entityDef);
                    entityCursor.setCursor(ei);
                    return entityCursor.getEntityInstance();
                }

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

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From source file:com.vaushell.superpipes.tools.scribe.linkedin.LinkedInClient.java

/**
 * Iterate a LinkedIn Feed.//from  w  ww. j  ava 2  s  .com
 *
 * @param forcedTarget Target's ID. Could be null to use login target.
 * @param count Max status by call. Could be null to use default.
 * @return a status iterator.
 */
public Iterator<LNK_Status> iteratorFeed(final String forcedTarget, final Integer count) {
    if (LOGGER.isTraceEnabled()) {
        LOGGER.trace("[" + getClass().getSimpleName() + "] iteratorFeed() : forcedTarget=" + forcedTarget
                + " / count=" + count);
    }

    return new Iterator<LNK_Status>() {
        @Override
        public boolean hasNext() {
            try {
                if (bufferCursor < buffer.size()) {
                    return true;
                } else {
                    buffer.clear();
                    bufferCursor = 0;

                    final String url;
                    final Properties properties = new Properties();
                    properties.setProperty("scope", "self");
                    properties.setProperty("type", "SHAR");
                    properties.setProperty("format", "json");
                    if (count != null) {
                        properties.setProperty("count", Integer.toString(count));
                    }

                    if (forcedTarget == null) {
                        url = "http://api.linkedin.com/v1/people/~/network/updates";
                    } else {
                        url = "http://api.linkedin.com/v1/people/id=" + forcedTarget + "/network/updates";
                    }

                    if (lastTimestamp != null) {
                        properties.setProperty("before", Long.toString(lastTimestamp.getMillis() - 1L));
                    }

                    final List<LNK_Status> posts = readFeedImpl(url, properties);
                    if (posts.isEmpty()) {
                        return false;
                    } else {
                        lastTimestamp = posts.get(posts.size() - 1).getTimestamp();

                        buffer.addAll(posts);

                        return true;
                    }
                }
            } catch (final LinkedInException | IOException ex) {
                throw new RuntimeException(ex);
            }
        }

        @Override
        public LNK_Status next() {
            return buffer.get(bufferCursor++);
        }

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

        // PRIVATE
        private final List<LNK_Status> buffer = new ArrayList<>();
        private int bufferCursor;
        private DateTime lastTimestamp;
    };
}

---

From source file:oculus.aperture.common.JSONProperties.java

@Override
public Iterable<Integer> getIntegers(String key) {
    try {/*from  w ww.  j  a  v  a2  s  . co m*/
        final JSONArray array = obj.getJSONArray(key);

        return new Iterable<Integer>() {
            @Override
            public Iterator<Integer> iterator() {
                return new Iterator<Integer>() {
                    private final int n = array.length();
                    private int i = 0;

                    @Override
                    public boolean hasNext() {
                        return n > i;
                    }

                    @Override
                    public Integer next() {
                        try {
                            return (n > i) ? array.getInt(i++) : null;
                        } catch (JSONException e) {
                            return null;
                        }
                    }

                    @Override
                    public void remove() {
                        throw new UnsupportedOperationException();
                    }
                };
            }
        };
    } catch (JSONException e) {
        return EmptyIterable.instance();
    }
}

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