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:org.paxml.bean.excel.ReadExcelTag.java

/**
 * Do excel query.//from   w  w  w.jav  a 2s. co m
 * 
 * @param context
 * @return iterator if lazy, otherwise list.
 * @throws Exception
 */
private Iterator doQuery(Context context) throws Exception {

    return new Iterator() {
        private Connection con;
        private PreparedStatement s;
        private ResultSet rs;
        private String[] columns;

        @Override
        public void finalize() {
            end();
        }

        private void end() {
            closeQueryResource(con, s, rs);
        }

        private void start() {
            if (con != null) {
                return;
            }
            File f = file.getFile();
            con = getConnection(f);
            if (log.isDebugEnabled()) {
                log.debug("Opened excel file via odbc: " + f.getAbsolutePath());
                log.debug("Executing excel query: " + query);
            }
            try {
                s = getPreparedStatement(con);
                s.execute();
                rs = s.getResultSet();
                if (rs != null) {

                    ResultSetMetaData meta = rs.getMetaData();
                    columns = new String[meta.getColumnCount()];
                    for (int i = columns.length - 1; i >= 0; i--) {
                        columns[i] = meta.getColumnName(i);
                    }

                }
            } catch (Exception e) {
                end();
                throw new PaxmlRuntimeException("Cannot execute excel query: " + query);
            }
        }

        @Override
        public boolean hasNext() {
            start();
            try {
                boolean hasNext = rs != null && rs.next();
                if (!hasNext) {
                    end();
                }
                return hasNext;
            } catch (Exception e) {
                end();
                throw new PaxmlRuntimeException(e);
            }
        }

        @Override
        public Object next() {
            Map<String, Object> row = new LinkedHashMap<String, Object>(columns.length);
            try {

                for (int i = 1; i <= columns.length; i++) {
                    String column = columns[i];
                    Object value = rs.getObject(i);
                    row.put(column, value);
                }
            } catch (Exception e) {
                end();
                throw new PaxmlRuntimeException(e);
            }
            return row;
        }

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

    };

}

---

From source file:org.apache.cocoon.components.expression.jexl.JSIntrospector.java

public Iterator getIterator(Object obj, Info i) throws Exception {
    if (!(obj instanceof Scriptable)) {
        // support Enumeration
        /*// w ww.  j av  a  2 s .c  om
           Booth Enumeration and Iterator are supported in
           Uberspect. The only difference is that they emit a
           rather long warning message to commons logging, telling
           that Enumerations and Iterator not are resettable and
           cannot be reused.
        */
        if (obj instanceof Enumeration) {
            final Enumeration e = (Enumeration) obj;
            return new Iterator() {

                public boolean hasNext() {
                    return e.hasMoreElements();
                }

                public Object next() {
                    return e.nextElement();
                }

                public void remove() {
                    // no action
                }

            };
        }
        if (obj instanceof Iterator) {
            // support Iterator
            return (Iterator) obj;
        }
        return super.getIterator(obj, i);
    }
    if (obj instanceof NativeArray) {
        return new NativeArrayIterator((NativeArray) obj);
    }
    return new ScriptableIterator((Scriptable) obj);
}

---

From source file:com.skelril.aurora.jail.CSVJailCellDatabase.java

@Override
public Iterator<JailCell> iterator() {

    return new Iterator<JailCell>() {

        private final Iterator<JailCell> setIter = jailCells.iterator();
        private JailCell next;

        public boolean hasNext() {

            return setIter.hasNext();
        }//w  w  w. j a v  a  2  s. c o  m

        public JailCell next() {

            return next = setIter.next();
        }

        public void remove() {

            deleteJailCell(next.getPrisonName(), next.getCellName(), null);
        }
    };
}

---

From source file:com.norconex.collector.core.data.store.impl.mongo.MongoCrawlDataStore.java

@Override
public Iterator<ICrawlData> getCacheIterator() {
    final DBCursor cursor = collCached.find();
    return new Iterator<ICrawlData>() {
        @Override//w  w w . j a v a  2s .  c om
        public boolean hasNext() {
            return cursor.hasNext();
        }

        @Override
        public ICrawlData next() {
            return serializer.fromDBObject(cursor.next());
        }

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

---

From source file:com.github.fcannizzaro.prefs.Prefs.java

/**
 * Iterate a kind of values (String, Boolean , Integer ..)
 *//*from w  w w  . ja  v  a 2 s.  c  o m*/
public static <T> Iterator<Item<T>> iterator(Class c) {

    JSONObject obj = objects;

    if (c.equals(Integer.class))
        obj = integers;
    else if (c.equals(Float.class))
        obj = floats;
    else if (c.equals(Boolean.class))
        obj = booleans;
    else if (c.equals(String.class))
        obj = strings;
    else if (c.equals(Double.class))
        obj = doubles;

    final Iterator<String> keys = obj.keys();
    final JSONObject finalObj = obj;

    return new Iterator<Item<T>>() {

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

        @Override
        public Item<T> next() {
            String key = keys.next();
            return new Item(key, finalObj.get(key));
        }

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

---

From source file:jetbrains.exodus.entitystore.FileSystemBlobVaultOld.java

@Override
public BackupStrategy getBackupStrategy() {
    return new BackupStrategy() {

        @Override/*  w  w  w .j  a  v  a 2 s.c o m*/
        public Iterable<FileDescriptor> listFiles() {
            return new Iterable<FileDescriptor>() {
                @Override
                public Iterator<FileDescriptor> iterator() {
                    final Deque<FileDescriptor> queue = new LinkedList<>();
                    queue.add(new FileDescriptor(location, blobsDirectory + File.separator));
                    return new Iterator<FileDescriptor>() {
                        int i = 0;
                        int n = 0;
                        File[] files;
                        FileDescriptor next;
                        String currentPrefix;

                        @Override
                        public boolean hasNext() {
                            if (next != null) {
                                return true;
                            }
                            while (i < n) {
                                final File file = files[i++];
                                final String name = file.getName();
                                if (file.isDirectory()) {
                                    queue.push(new FileDescriptor(file,
                                            currentPrefix + file.getName() + File.separator));
                                } else if (file.isFile()) {
                                    final long fileSize = file.length();
                                    if (fileSize == 0)
                                        continue;
                                    if (name.endsWith(blobExtension) || name.equalsIgnoreCase(VERSION_FILE)) {
                                        next = new FileDescriptor(file, currentPrefix, fileSize);
                                        return true;
                                    }
                                } else {
                                    // something strange with filesystem
                                    throw new EntityStoreException(
                                            "File or directory expected: " + file.toString());
                                }
                            }
                            if (queue.isEmpty()) {
                                return false;
                            }
                            final FileDescriptor fd = queue.pop();
                            files = IOUtil.listFiles(fd.getFile());
                            currentPrefix = fd.getPath();
                            i = 0;
                            n = files.length;
                            next = fd;
                            return true;
                        }

                        @Override
                        public FileDescriptor next() {
                            if (!hasNext()) {
                                throw new NoSuchElementException();
                            }
                            final FileDescriptor result = next;
                            next = null;
                            return result;
                        }

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

---

From source file:com.skelril.aurora.jail.CSVInmateDatabase.java

public Iterator<Inmate> iterator() {

    return new Iterator<Inmate>() {

        private final Iterator<Map.Entry<UUID, Inmate>> setIter = UUIDInmate.entrySet().iterator();
        private Inmate next;

        public boolean hasNext() {
            return setIter.hasNext();
        }/*  w  w  w. j av a  2 s .  c  o m*/

        public Inmate next() {
            next = setIter.next().getValue();
            return next;
        }

        public void remove() {
            unjail(next.getID(), null, "Removed by iterator");
        }
    };
}

---

From source file:org.apache.hadoop.yarn.server.api.records.impl.pb.NodeStatusPBImpl.java

private synchronized void addKeepAliveApplicationsToProto() {
    maybeInitBuilder();//w w  w  . j a v a 2s .  c  o m
    builder.clearKeepAliveApplications();
    if (keepAliveApplications == null)
        return;
    Iterable<ApplicationIdProto> iterable = new Iterable<ApplicationIdProto>() {
        @Override
        public Iterator<ApplicationIdProto> iterator() {
            return new Iterator<ApplicationIdProto>() {

                Iterator<ApplicationId> iter = keepAliveApplications.iterator();

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

                @Override
                public ApplicationIdProto next() {
                    return convertToProtoFormat(iter.next());
                }

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

                }
            };

        }
    };
    builder.addAllKeepAliveApplications(iterable);
}

---

From source file:act.installer.brenda.SQLConnection.java

/**
 * Iterate over all BRENDA organisms./*w  ww . ja  v a 2 s.  co m*/
 * @return An iterator over all BRENDA organisms.
 * @throws SQLException
 */
public Iterator<BrendaSupportingEntries.Organism> getOrganisms() throws SQLException {
    final PreparedStatement stmt = brendaConn.prepareStatement(BrendaSupportingEntries.Organism.QUERY);
    final ResultSet results = stmt.executeQuery();

    return new Iterator<BrendaSupportingEntries.Organism>() {
        @Override
        public boolean hasNext() {
            return hasNextHelper(results, stmt);
        }

        @Override
        public BrendaSupportingEntries.Organism next() {
            try {
                results.next();
                return BrendaSupportingEntries.Organism.fromResultSet(results);
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
    };
}

---

From source file:sample.client.Application.java

<T> Iterable<T> toIterable(final Enumeration<T> enumeration) {
    return new Iterable<T>() {
        public Iterator<T> iterator() {
            return (enumeration == null ? Collections.<T>emptyIterator() : new Iterator<T>() {
                public boolean hasNext() {
                    return enumeration.hasMoreElements();
                }//  w ww  .j  ava  2 s  . co  m

                public T next() {
                    return enumeration.nextElement();
                }

                public void remove() {
                    throw new UnsupportedOperationException("Auto-generated method stub");
                }
            });
        }
    };
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• »