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

        }
        return result;
    }


    public boolean deleteCenterUsers(String centerId) {
        DBCursor cursor = coll.find(BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get());
        boolean result = false;
        if (cursor.count() > 0) {
            coll.remove(cursor.next());
            result = true;
        }
        return result;
    }

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        List<DBObject> objects = coll.find(BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get()).skip(offset * page).limit(offset).toArray();
        return objects.isEmpty() ? Collections.EMPTY_LIST : dbObjectsToCenterUsers(objects);
    }


    public Collection<CenterUser> getCenterUsersForReport(String centerId) {
        DBCursor cursor = coll.find(BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get());
        List<DBObject> objects = new ArrayList<DBObject>();
        while (cursor.hasNext()) {
            objects.add(cursor.next());
        }
        return objects.isEmpty() ? Collections.EMPTY_LIST : dbObjectsToCenterUsers(objects);
    }

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        }
        return objects.isEmpty() ? Collections.EMPTY_LIST : dbObjectsToCenterUsers(objects);
    }


    public Collection<String> getCenterUsersMail(String centerId) {
        DBCursor cursor = coll.find(BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get(), BasicDBObjectBuilder.start().add(CenterUserKeys.email, "").get());
        List<String> mails = new ArrayList<String>();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            mails.add(obj.get(CenterUserKeys.email).toString());
        }
        return mails;
    }

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        }
        return mails;
    }


    public Collection<String> getCenterUsersMobile(String centerId) {
        DBCursor cursor = coll.find(new BasicDBObject(), BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get());
        List<String> mobile = new ArrayList<String>();
        while (cursor.hasNext()) {
            mobile.add(cursor.next().get(CenterUserKeys.mobile).toString());
        }
        return mobile;
    }

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            coll.insert(new BasicDBObject(centerUser.toMap()));
        }
    }


    public void updateCenterUsers(Collection<String> ids, String groupId, String centerId) {
        DBCursor cursor = coll.find(BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get());
        while (cursor.hasNext()) {
            coll.update(cursor.next(), new BasicDBObject("$set", new BasicDBObject(CenterUserKeys.groupId, groupId)), false, false);
        }
    }

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            coll.update(cursor.next(), new BasicDBObject("$set", new BasicDBObject(CenterUserKeys.groupId, groupId)), false, false);
        }
    }


    public void updateDeleteGroup(String centerId, String groupId) {
        DBCursor cursor = coll.find(BasicDBObjectBuilder.start().add(CenterUserKeys.centerId, centerId).get());
        while (cursor.hasNext()) {
            coll.update(cursor.next(), new BasicDBObject("$set", new BasicDBObject(CenterUserKeys.groupId, "")), false, false);
        }
    }

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        List<String> emails = Collections.EMPTY_LIST;
        List<String> groups = extractGroups(listeWithSeparator, separator);
        if (!groups.isEmpty()) {
            emails = new FastList<String>();
            for (String current : groups) {
                DBCursor cursor = coll.find(new BasicDBObject(CenterUserKeys.groupId, current));
                while (cursor.hasNext()) {
                    emails.add(cursor.next().get(CenterUserKeys.email).toString());
                }
            }
        }
        return emails;
    }

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    }


    @Override
    public boolean deleteAllGroupsCenter(String centerId) throws DataAccessException {
        boolean result = false;
        DBCursor cursor = coll.find(new BasicDBObject(GroupKeys.centerId, centerId));
        if (cursor.hasNext()) {
            DBObject obj = cursor.next();
            coll.remove(obj);
            result = true;
        }
        return result;
    }

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    }


    @Override
    public List<CenterGroup> getGroupsCenter(String id) throws DataAccessException {
        List groups = null;
        DBCursor cursor = coll.find(new BasicDBObject(GroupKeys.centerId, id));
        if (cursor.hasNext())
            groups = new FastList<CenterGroup>();
        if (cursor.hasNext()) {
            groups.add(factory.createCenterGroup(cursor.next().toMap()));
        }
        return groups != null ? groups : Collections.EMPTY_LIST;
    }

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    @Override
    public List<String> getGroupsName() {
        List<String> names = null;
        DBCursor cursor = coll.find();
        if (cursor.hasNext())
            names = new FastList<String>();
        while (cursor.hasNext()) {
            names.add(cursor.next().get(GroupKeys.name).toString());
        }
        return null;
    }

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