private void applyVariables( VehicleRoutingSolution inputSolution, VehicleRoutingSolution varSolution) { List<Vehicle> inputVehicleList = inputSolution.getVehicleList(); Map<Long, Vehicle> inputVehicleMap = new LinkedHashMap<Long, Vehicle>(inputVehicleList.size()); for (Vehicle vehicle : inputVehicleList) { inputVehicleMap.put(vehicle.getId(), vehicle); } List<Customer> inputCustomerList = inputSolution.getCustomerList(); Map<Long, Customer> inputCustomerMap = new LinkedHashMap<Long, Customer>(inputCustomerList.size()); for (Customer customer : inputCustomerList) { inputCustomerMap.put(customer.getId(), customer); } for (Vehicle varVehicle : varSolution.getVehicleList()) { Vehicle inputVehicle = inputVehicleMap.get(varVehicle.getId()); Customer varNext = varVehicle.getNextCustomer(); inputVehicle.setNextCustomer(varNext == null ? null : inputCustomerMap.get(varNext.getId())); } for (Customer varCustomer : varSolution.getCustomerList()) { Customer inputCustomer = inputCustomerMap.get(varCustomer.getId()); Standstill varPrevious = varCustomer.getPreviousStandstill(); inputCustomer.setPreviousStandstill( varPrevious == null ? null : varPrevious instanceof Vehicle ? inputVehicleMap.get(((Vehicle) varPrevious).getId()) : inputCustomerMap.get(((Customer) varPrevious).getId())); Customer varNext = varCustomer.getNextCustomer(); inputCustomer.setNextCustomer(varNext == null ? null : inputCustomerMap.get(varNext.getId())); } ScoreDirector scoreDirector = scoreDirectorFactory.buildScoreDirector(); scoreDirector.setWorkingSolution(inputSolution); scoreDirector.calculateScore(); }