public void changeMaping(Employee employee, Equipment equipment) {
   Mapping mapping =
       database
           .find(Mapping.class)
           .add(MobeelizerRestrictions.eq("equipment", equipment.getGuid()))
           .uniqueResult();
   mapping.setEmployee(employee.getGuid());
   mapping.setCreationDate(new Date());
   mapping.setCreatedBy(Engine.getInstance().getUserIdentyfication().getCurrentUser().getId());
   database.save(mapping);
 }
  public void map(Place place, Employee employee) {
    List<Mapping> mappings =
        database
            .find(Mapping.class)
            .add(MobeelizerRestrictions.eq("employee", employee.getGuid()))
            .list();
    for (int i = 0; i < mappings.size(); ++i) {
      if (mappings.get(i).getPlace() != null) {
        database.delete(Mapping.class, mappings.get(i).getGuid());
      }
    }

    Mapping mapping = new Mapping();
    mapping.setEmployee(employee.getGuid());
    mapping.setPlace(place.getGuid());
    mapping.setCreatedBy(Engine.getInstance().getUserIdentyfication().getCurrentUser().getId());
    mapping.setCreationDate(new Date());
    database.save(mapping);
  }
 public void removeMapping(Mapping mapping) {
   database.delete(Mapping.class, mapping.getGuid());
   Log.i("Mapper", "mapping deleted");
 }