Problem retrieving folders

I am using Domino java toolkit.I would like to retrieve all the folders containing mails

////////////////////////////////////////////////

Database mailDatabase = session.getDbDirectory(“”).openMailDatabase();

Vector views = this.mailDatabase.getViews();

Vector folderNames = new Vector()

for (int i = 0; i < views.size(); i++) {

View view = (View) views.get(i);

if (view.isFolder()) {

   folderNames.add(view.getName());

}

}

////////////////////////////////////////////////

I get some folders out of my demand, like

(Rules), ($Alarms), (Group Calendars)

Does anyone know which property can filter them properly.

Thanks a lot.