Examples of com.mongodb.DBCursor

com.mongodb.DBCursor
An iterator over database results. Doing a find() query on a collection returns a DBCursor thus
```
 DBCursor cursor = collection.find( query ); if( cursor.hasNext() ) DBObject obj = cursor.next(); 
```
Warning: Calling toArray or length on a DBCursor will irrevocably turn it into an array. This means that, if the cursor was iterating over ten million results (which it was lazily fetching from the database), suddenly there will be a ten-million element array in memory. Before converting to an array, make sure that there are a reasonable number of results using skip() and limit().
For example, to get an array of the 1000-1100th elements of a cursor, use
```
 List obj = collection.find( query ).skip( 1000 ).limit( 100 ).toArray(); 
```
@dochub cursors

    }


    @Override
    public List<Center> getCentersByName(String name) {
        List<Center> centers = null;
        DBCursor cursor = coll.find(new BasicDBObject(CenterKeys.name, name.toUpperCase()));
        if(cursor.hasNext()) centers = new FastList<Center>();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            if (obj.get(CenterKeys.name).equals(name)) {
                centers.add(factory.createCenter(obj.toMap()));
            }
        }
        return centers != null? centers : Collections.EMPTY_LIST;

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    }


    @Override
    public List<String> getCentersNames() {
        List<String> names = null;
        DBCursor cursor = coll.find();
        if(cursor.hasNext()) names = new FastList<String>();
        while (cursor.hasNext()) {
            names.add(cursor.next().get(CenterKeys.name).toString());
        }
        return names != null ? names : Collections.EMPTY_LIST;
    }

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            filter = FrameworkUtil.createFilter(filterValue);
        }


        DBCollection coll = getCollection();


        DBCursor cursor = coll.find();
        try {
            while (cursor.hasNext()) {
                // Hmm, there might be a more clever way of doing this...
                Role role = m_helper.deserialize(cursor.next());
                if ((filter == null) || filter.match(role.getProperties())) {
                    roles.add(role);
                }
            }
        } finally {
            cursor.close();
        }


        return roles.toArray(new Role[roles.size()]);
    }

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    @Override
    public Role getRole(String name) {
        DBCollection coll = getCollection();


        DBCursor cursor = coll.find(getTemplateObject(name));
        try {
            if (cursor.hasNext()) {
                return m_helper.deserialize(cursor.next());
            }
        } finally {
            cursor.close();
        }


        return null;
    }

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    if (matcher == null) {
      return;
    }
    JsonObject sort = message.body.getObject("sort");
    DBCollection coll = db.getCollection(collection);
    DBCursor cursor = coll.find(jsonToDBObject(matcher));
    if (limit != -1) {
      cursor.limit(limit);
    }
    if (sort != null) {
      cursor.sort(jsonToDBObject(sort));
    }
    sendBatch(message, cursor, batchSize);
  }

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            queryBuilder.greaterThanEquals(startValue);
        }
        DBObject query = queryBuilder.get();
        long start = start();
        try {
            DBCursor cursor = dbCollection.find(query).sort(BY_ID_ASC);
            List<T> list = new ArrayList<T>();
            for (int i = 0; i < limit && cursor.hasNext(); i++) {
                DBObject o = cursor.next();
                T doc = convertFromDBObject(collection, o);
                if (collection == Collection.NODES && doc != null) {
                    doc.seal();
                    String id = doc.getId();
                    Lock lock = getAndLock(id);

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      query.put("topicGuid", topicGuid);


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("publishedTimestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp).skip(offset).limit(limit);
      List<Message> docs = new ArrayList<Message>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        docs.add(deserialise(next, Message.class, true));
      }
      return docs;
    }
    catch(Exception e)

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      BasicDBObject query = new BasicDBObject();


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("publishedTimestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp).skip(offset).limit(limit);


      List<Message> docs = new ArrayList<Message>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        docs.add(deserialise(next, Message.class, true));
      }
      return docs;
    }
    catch(Exception e)

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      query.put("publishedTimestamp", new BasicDBObject("$gt", afterTimestamp));


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("publishedTimestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp);


      List<Message> docs = new ArrayList<Message>();
      long lastTimestamp = Long.MIN_VALUE;
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        Message message = deserialise(next, Message.class, true);


        if (docs.size() >= preferredLimit &&
            lastTimestamp != message.getPublishedTimestamp())
        {

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      keys.put("guid", 1);


      BasicDBObject byTimestamp = new BasicDBObject();
      byTimestamp.put("publishedTimestamp", 1);


      DBCursor cursor = collection.find(query).sort(byTimestamp);


      List<String> ids = new ArrayList<String>();
      while (cursor.hasNext())
      {
        DBObject next = cursor.next();
        String messageGuid = (String) next.get("guid");
        ids.add(messageGuid);;
      }
      return ids;
    }

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