ai_order.cpp

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00001 /* $Id: ai_order.cpp 18667 2009-12-30 18:07:28Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "ai_vehicle.hpp"
00013 #include "../ai_instance.hpp"
00014 #include "../../debug.h"
00015 #include "../../vehicle_base.h"
00016 #include "../../roadstop_base.h"
00017 #include "../../depot_base.h"
00018 #include "../../station_base.h"
00019 #include "../../waypoint_base.h"
00020 
00026 static OrderType GetOrderTypeByTile(TileIndex t)
00027 {
00028   if (!::IsValidTile(t)) return OT_END;
00029 
00030   switch (::GetTileType(t)) {
00031     default: break;
00032     case MP_STATION:
00033       if (IsBuoy(t) || IsRailWaypoint(t)) return OT_GOTO_WAYPOINT;
00034       if (IsHangar(t)) return OT_GOTO_DEPOT;
00035       return OT_GOTO_STATION;
00036       break;
00037     case MP_WATER:   if (::IsShipDepot(t)) return OT_GOTO_DEPOT; break;
00038     case MP_ROAD:    if (::GetRoadTileType(t) == ROAD_TILE_DEPOT) return OT_GOTO_DEPOT; break;
00039     case MP_RAILWAY:
00040       if (IsRailDepot(t)) return OT_GOTO_DEPOT;
00041       break;
00042   }
00043 
00044   return OT_END;
00045 }
00046 
00047 /* static */ bool AIOrder::IsValidVehicleOrder(VehicleID vehicle_id, OrderPosition order_position)
00048 {
00049   return AIVehicle::IsValidVehicle(vehicle_id) && order_position >= 0 && (order_position < ::Vehicle::Get(vehicle_id)->GetNumOrders() || order_position == ORDER_CURRENT);
00050 }
00051 
00057 static const Order *ResolveOrder(VehicleID vehicle_id, AIOrder::OrderPosition order_position)
00058 {
00059   const Vehicle *v = ::Vehicle::Get(vehicle_id);
00060   if (order_position == AIOrder::ORDER_CURRENT) {
00061     const Order *order = &v->current_order;
00062     if (order->GetType() == OT_GOTO_DEPOT && !(order->GetDepotOrderType() & ODTFB_PART_OF_ORDERS)) return order;
00063     order_position = AIOrder::ResolveOrderPosition(vehicle_id, order_position);
00064     if (order_position == AIOrder::ORDER_INVALID) return NULL;
00065   }
00066   return v->GetOrder(order_position);
00067 }
00068 
00069 /* static */ bool AIOrder::IsGotoStationOrder(VehicleID vehicle_id, OrderPosition order_position)
00070 {
00071   if (!IsValidVehicleOrder(vehicle_id, order_position)) return false;
00072 
00073   const Order *order = ::ResolveOrder(vehicle_id, order_position);
00074   return order != NULL && order->GetType() == OT_GOTO_STATION;
00075 }
00076 
00077 /* static */ bool AIOrder::IsGotoDepotOrder(VehicleID vehicle_id, OrderPosition order_position)
00078 {
00079   if (!IsValidVehicleOrder(vehicle_id, order_position)) return false;
00080 
00081   const Order *order = ::ResolveOrder(vehicle_id, order_position);
00082   return order != NULL && order->GetType() == OT_GOTO_DEPOT;
00083 }
00084 
00085 /* static */ bool AIOrder::IsGotoWaypointOrder(VehicleID vehicle_id, OrderPosition order_position)
00086 {
00087   if (!IsValidVehicleOrder(vehicle_id, order_position)) return false;
00088 
00089   const Order *order = ::ResolveOrder(vehicle_id, order_position);
00090   return order != NULL && order->GetType() == OT_GOTO_WAYPOINT;
00091 }
00092 
00093 /* static */ bool AIOrder::IsConditionalOrder(VehicleID vehicle_id, OrderPosition order_position)
00094 {
00095   if (order_position == ORDER_CURRENT) return false;
00096   if (!IsValidVehicleOrder(vehicle_id, order_position)) return false;
00097 
00098   const Order *order = Vehicle::Get(vehicle_id)->GetOrder(order_position);
00099   return order->GetType() == OT_CONDITIONAL;
00100 }
00101 
00102 /* static */ bool AIOrder::IsCurrentOrderPartOfOrderList(VehicleID vehicle_id)
00103 {
00104   if (AIVehicle::IsValidVehicle(vehicle_id)) return false;
00105   if (GetOrderCount(vehicle_id) == 0) return false;
00106 
00107   const Order *order = &::Vehicle::Get(vehicle_id)->current_order;
00108   if (order->GetType() != OT_GOTO_DEPOT) return true;
00109   return (order->GetDepotOrderType() & ODTFB_PART_OF_ORDERS) != 0;
00110 }
00111 
00112 /* static */ AIOrder::OrderPosition AIOrder::ResolveOrderPosition(VehicleID vehicle_id, OrderPosition order_position)
00113 {
00114   if (!AIVehicle::IsValidVehicle(vehicle_id)) return ORDER_INVALID;
00115 
00116   if (order_position == ORDER_CURRENT) return (AIOrder::OrderPosition)::Vehicle::Get(vehicle_id)->cur_order_index;
00117   return (order_position >= 0 && order_position < ::Vehicle::Get(vehicle_id)->GetNumOrders()) ? order_position : ORDER_INVALID;
00118 }
00119 
00120 
00121 /* static */ bool AIOrder::AreOrderFlagsValid(TileIndex destination, AIOrderFlags order_flags)
00122 {
00123   OrderType ot = (order_flags & AIOF_GOTO_NEAREST_DEPOT) ? OT_GOTO_DEPOT : ::GetOrderTypeByTile(destination);
00124   switch (ot) {
00125     case OT_GOTO_STATION:
00126       return (order_flags & ~(AIOF_NON_STOP_FLAGS | AIOF_UNLOAD_FLAGS | AIOF_LOAD_FLAGS)) == 0 &&
00127           /* Test the different mutual exclusive flags. */
00128           ((order_flags & AIOF_TRANSFER)      == 0 || (order_flags & AIOF_UNLOAD)    == 0) &&
00129           ((order_flags & AIOF_TRANSFER)      == 0 || (order_flags & AIOF_NO_UNLOAD) == 0) &&
00130           ((order_flags & AIOF_UNLOAD)        == 0 || (order_flags & AIOF_NO_UNLOAD) == 0) &&
00131           ((order_flags & AIOF_UNLOAD)        == 0 || (order_flags & AIOF_NO_UNLOAD) == 0) &&
00132           ((order_flags & AIOF_NO_UNLOAD)     == 0 || (order_flags & AIOF_NO_LOAD)   == 0) &&
00133           ((order_flags & AIOF_FULL_LOAD_ANY) == 0 || (order_flags & AIOF_NO_LOAD)   == 0);
00134 
00135     case OT_GOTO_DEPOT:
00136       return (order_flags & ~(AIOF_NON_STOP_FLAGS | AIOF_DEPOT_FLAGS)) == 0 &&
00137           ((order_flags & AIOF_SERVICE_IF_NEEDED) == 0 || (order_flags & AIOF_STOP_IN_DEPOT) == 0);
00138 
00139     case OT_GOTO_WAYPOINT: return (order_flags & ~(AIOF_NON_STOP_FLAGS)) == 0;
00140     default:               return false;
00141   }
00142 }
00143 
00144 /* static */ bool AIOrder::IsValidConditionalOrder(OrderCondition condition, CompareFunction compare)
00145 {
00146   switch (condition) {
00147     case OC_LOAD_PERCENTAGE:
00148     case OC_RELIABILITY:
00149     case OC_MAX_SPEED:
00150     case OC_AGE:
00151       return compare >= CF_EQUALS && compare <= CF_MORE_EQUALS;
00152 
00153     case OC_REQUIRES_SERVICE:
00154       return compare == CF_IS_TRUE || compare == CF_IS_FALSE;
00155 
00156     case OC_UNCONDITIONALLY:
00157       return true;
00158 
00159     default: return false;
00160   }
00161 }
00162 
00163 /* static */ int32 AIOrder::GetOrderCount(VehicleID vehicle_id)
00164 {
00165   return AIVehicle::IsValidVehicle(vehicle_id) ? ::Vehicle::Get(vehicle_id)->GetNumOrders() : -1;
00166 }
00167 
00168 /* static */ TileIndex AIOrder::GetOrderDestination(VehicleID vehicle_id, OrderPosition order_position)
00169 {
00170   if (!IsValidVehicleOrder(vehicle_id, order_position)) return INVALID_TILE;
00171 
00172   const Order *order = ::ResolveOrder(vehicle_id, order_position);
00173   if (order == NULL || order->GetType() == OT_CONDITIONAL) return INVALID_TILE;
00174   const Vehicle *v = ::Vehicle::Get(vehicle_id);
00175 
00176   switch (order->GetType()) {
00177     case OT_GOTO_DEPOT: {
00178       /* We don't know where the nearest depot is... (yet) */
00179       if (order->GetDepotActionType() & ODATFB_NEAREST_DEPOT) return INVALID_TILE;
00180 
00181       if (v->type != VEH_AIRCRAFT) return ::Depot::Get(order->GetDestination())->xy;
00182       /* Aircraft's hangars are referenced by StationID, not DepotID */
00183       const Station *st = ::Station::Get(order->GetDestination());
00184       const AirportFTAClass *airport = st->Airport();
00185       if (airport == NULL || airport->nof_depots == 0) return INVALID_TILE;
00186       return st->airport_tile + ::ToTileIndexDiff(st->Airport()->airport_depots[0]);
00187     }
00188 
00189     case OT_GOTO_STATION: {
00190       const Station *st = ::Station::Get(order->GetDestination());
00191       if (st->train_station.tile != INVALID_TILE) {
00192         for (uint i = 0; i < st->train_station.w; i++) {
00193           TileIndex t = st->train_station.tile + TileDiffXY(i, 0);
00194           if (st->TileBelongsToRailStation(t)) return t;
00195         }
00196       } else if (st->dock_tile != INVALID_TILE) {
00197         return st->dock_tile;
00198       } else if (st->bus_stops != NULL) {
00199         return st->bus_stops->xy;
00200       } else if (st->truck_stops != NULL) {
00201         return st->truck_stops->xy;
00202       } else if (st->airport_tile != INVALID_TILE) {
00203         const AirportFTAClass *fta = st->Airport();
00204         TILE_LOOP(tile, fta->size_x, fta->size_y, st->airport_tile) {
00205           if (!::IsHangar(tile)) return tile;
00206         }
00207       }
00208       return INVALID_TILE;
00209     }
00210     case OT_GOTO_WAYPOINT: return ::Waypoint::Get(order->GetDestination())->xy;
00211     default:               return INVALID_TILE;
00212   }
00213 }
00214 
00215 /* static */ AIOrder::AIOrderFlags AIOrder::GetOrderFlags(VehicleID vehicle_id, OrderPosition order_position)
00216 {
00217   if (!IsValidVehicleOrder(vehicle_id, order_position)) return AIOF_INVALID;
00218 
00219   const Order *order = ::ResolveOrder(vehicle_id, order_position);
00220   if (order == NULL || order->GetType() == OT_CONDITIONAL) return AIOF_INVALID;
00221 
00222   AIOrderFlags order_flags = AIOF_NONE;
00223   order_flags |= (AIOrderFlags)order->GetNonStopType();
00224   switch (order->GetType()) {
00225     case OT_GOTO_DEPOT:
00226       if (order->GetDepotOrderType() & ODTFB_SERVICE) order_flags |= AIOF_SERVICE_IF_NEEDED;
00227       if (order->GetDepotActionType() & ODATFB_HALT) order_flags |= AIOF_STOP_IN_DEPOT;
00228       if (order->GetDepotActionType() & ODATFB_NEAREST_DEPOT) order_flags |= AIOF_GOTO_NEAREST_DEPOT;
00229       break;
00230 
00231     case OT_GOTO_STATION:
00232       order_flags |= (AIOrderFlags)(order->GetLoadType()   << 5);
00233       order_flags |= (AIOrderFlags)(order->GetUnloadType() << 2);
00234       break;
00235 
00236     default: break;
00237   }
00238 
00239   return order_flags;
00240 }
00241 
00242 /* static */ AIOrder::OrderPosition AIOrder::GetOrderJumpTo(VehicleID vehicle_id, OrderPosition order_position)
00243 {
00244   if (!IsValidVehicleOrder(vehicle_id, order_position)) return ORDER_INVALID;
00245   if (order_position == ORDER_CURRENT || !IsConditionalOrder(vehicle_id, order_position)) return ORDER_INVALID;
00246 
00247   const Order *order = Vehicle::Get(vehicle_id)->GetOrder(order_position);
00248   return (OrderPosition)order->GetConditionSkipToOrder();
00249 }
00250 
00251 /* static */ AIOrder::OrderCondition AIOrder::GetOrderCondition(VehicleID vehicle_id, OrderPosition order_position)
00252 {
00253   if (!IsValidVehicleOrder(vehicle_id, order_position)) return OC_INVALID;
00254   if (order_position == ORDER_CURRENT || !IsConditionalOrder(vehicle_id, order_position)) return OC_INVALID;
00255 
00256   const Order *order = Vehicle::Get(vehicle_id)->GetOrder(order_position);
00257   return (OrderCondition)order->GetConditionVariable();
00258 }
00259 
00260 /* static */ AIOrder::CompareFunction AIOrder::GetOrderCompareFunction(VehicleID vehicle_id, OrderPosition order_position)
00261 {
00262   if (!IsValidVehicleOrder(vehicle_id, order_position)) return CF_INVALID;
00263   if (order_position == ORDER_CURRENT || !IsConditionalOrder(vehicle_id, order_position)) return CF_INVALID;
00264 
00265   const Order *order = Vehicle::Get(vehicle_id)->GetOrder(order_position);
00266   return (CompareFunction)order->GetConditionComparator();
00267 }
00268 
00269 /* static */ int32 AIOrder::GetOrderCompareValue(VehicleID vehicle_id, OrderPosition order_position)
00270 {
00271   if (!IsValidVehicleOrder(vehicle_id, order_position)) return -1;
00272   if (order_position == ORDER_CURRENT || !IsConditionalOrder(vehicle_id, order_position)) return -1;
00273 
00274   const Order *order = Vehicle::Get(vehicle_id)->GetOrder(order_position);
00275   int32 value = order->GetConditionValue();
00276   if (order->GetConditionVariable() == OCV_MAX_SPEED) value = value * 16 / 10;
00277   return value;
00278 }
00279 
00280 /* static */ bool AIOrder::SetOrderJumpTo(VehicleID vehicle_id, OrderPosition order_position, OrderPosition jump_to)
00281 {
00282   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position));
00283   EnforcePrecondition(false, order_position != ORDER_CURRENT && IsConditionalOrder(vehicle_id, order_position));
00284   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, jump_to) && jump_to != ORDER_CURRENT);
00285 
00286   return AIObject::DoCommand(0, vehicle_id | (order_position << 16), MOF_COND_DESTINATION | (jump_to << 4), CMD_MODIFY_ORDER);
00287 }
00288 
00289 /* static */ bool AIOrder::SetOrderCondition(VehicleID vehicle_id, OrderPosition order_position, OrderCondition condition)
00290 {
00291   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position));
00292   EnforcePrecondition(false, order_position != ORDER_CURRENT && IsConditionalOrder(vehicle_id, order_position));
00293   EnforcePrecondition(false, condition >= OC_LOAD_PERCENTAGE && condition <= OC_UNCONDITIONALLY);
00294 
00295   return AIObject::DoCommand(0, vehicle_id | (order_position << 16), MOF_COND_VARIABLE | (condition << 4), CMD_MODIFY_ORDER);
00296 }
00297 
00298 /* static */ bool AIOrder::SetOrderCompareFunction(VehicleID vehicle_id, OrderPosition order_position, CompareFunction compare)
00299 {
00300   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position));
00301   EnforcePrecondition(false, order_position != ORDER_CURRENT && IsConditionalOrder(vehicle_id, order_position));
00302   EnforcePrecondition(false, compare >= CF_EQUALS && compare <= CF_IS_FALSE);
00303 
00304   return AIObject::DoCommand(0, vehicle_id | (order_position << 16), MOF_COND_COMPARATOR | (compare << 4), CMD_MODIFY_ORDER);
00305 }
00306 
00307 /* static */ bool AIOrder::SetOrderCompareValue(VehicleID vehicle_id, OrderPosition order_position, int32 value)
00308 {
00309   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position));
00310   EnforcePrecondition(false, order_position != ORDER_CURRENT && IsConditionalOrder(vehicle_id, order_position));
00311   EnforcePrecondition(false, value >= 0 && value < 2048);
00312   if (GetOrderCondition(vehicle_id, order_position) == OC_MAX_SPEED) value = value * 10 / 16;
00313 
00314   return AIObject::DoCommand(0, vehicle_id | (order_position << 16), MOF_COND_VALUE | (value << 4), CMD_MODIFY_ORDER);
00315 }
00316 
00317 /* static */ bool AIOrder::AppendOrder(VehicleID vehicle_id, TileIndex destination, AIOrderFlags order_flags)
00318 {
00319   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00320   EnforcePrecondition(false, AreOrderFlagsValid(destination, order_flags));
00321 
00322   return InsertOrder(vehicle_id, (AIOrder::OrderPosition)::Vehicle::Get(vehicle_id)->GetNumOrders(), destination, order_flags);
00323 }
00324 
00325 /* static */ bool AIOrder::AppendConditionalOrder(VehicleID vehicle_id, OrderPosition jump_to)
00326 {
00327   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00328   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, jump_to));
00329 
00330   return InsertConditionalOrder(vehicle_id, (AIOrder::OrderPosition)::Vehicle::Get(vehicle_id)->GetNumOrders(), jump_to);
00331 }
00332 
00333 /* static */ bool AIOrder::InsertOrder(VehicleID vehicle_id, OrderPosition order_position, TileIndex destination, AIOrder::AIOrderFlags order_flags)
00334 {
00335   /* IsValidVehicleOrder is not good enough because it does not allow appending. */
00336   if (order_position == ORDER_CURRENT) order_position = AIOrder::ResolveOrderPosition(vehicle_id, order_position);
00337 
00338   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00339   EnforcePrecondition(false, order_position >= 0 && order_position <= ::Vehicle::Get(vehicle_id)->GetNumOrders());
00340   EnforcePrecondition(false, AreOrderFlagsValid(destination, order_flags));
00341 
00342   Order order;
00343   OrderType ot = (order_flags & AIOF_GOTO_NEAREST_DEPOT) ? OT_GOTO_DEPOT : ::GetOrderTypeByTile(destination);
00344   switch (ot) {
00345     case OT_GOTO_DEPOT: {
00346       OrderDepotTypeFlags odtf = (OrderDepotTypeFlags)(ODTFB_PART_OF_ORDERS | ((order_flags & AIOF_SERVICE_IF_NEEDED) ? ODTFB_SERVICE : 0));
00347       OrderDepotActionFlags odaf = (OrderDepotActionFlags)(ODATF_SERVICE_ONLY | ((order_flags & AIOF_STOP_IN_DEPOT) ? ODATFB_HALT : 0));
00348       if (order_flags & AIOF_GOTO_NEAREST_DEPOT) odaf |= ODATFB_NEAREST_DEPOT;
00349       OrderNonStopFlags onsf = (OrderNonStopFlags)((order_flags & AIOF_NON_STOP_INTERMEDIATE) ? ONSF_NO_STOP_AT_INTERMEDIATE_STATIONS : ONSF_STOP_EVERYWHERE);
00350       if (order_flags & AIOF_GOTO_NEAREST_DEPOT) {
00351         order.MakeGoToDepot(0, odtf, onsf, odaf);
00352       } else {
00353         /* Check explicitly if the order is to a station (for aircraft) or
00354          * to a depot (other vehicle types). */
00355         if (::Vehicle::Get(vehicle_id)->type == VEH_AIRCRAFT) {
00356           if (!::IsTileType(destination, MP_STATION)) return false;
00357           order.MakeGoToDepot(::GetStationIndex(destination), odtf, onsf, odaf);
00358         } else {
00359           if (::IsTileType(destination, MP_STATION)) return false;
00360           order.MakeGoToDepot(::GetDepotIndex(destination), odtf, onsf, odaf);
00361         }
00362       }
00363       break;
00364     }
00365 
00366     case OT_GOTO_STATION:
00367       order.MakeGoToStation(::GetStationIndex(destination));
00368       order.SetLoadType((OrderLoadFlags)GB(order_flags, 5, 3));
00369       order.SetUnloadType((OrderUnloadFlags)GB(order_flags, 2, 3));
00370       order.SetStopLocation(OSL_PLATFORM_FAR_END);
00371       break;
00372 
00373     case OT_GOTO_WAYPOINT:
00374       order.MakeGoToWaypoint(::GetStationIndex(destination));
00375       break;
00376 
00377     default:
00378       return false;
00379   }
00380 
00381   order.SetNonStopType((OrderNonStopFlags)GB(order_flags, 0, 2));
00382 
00383   return AIObject::DoCommand(0, vehicle_id | (order_position << 16), order.Pack(), CMD_INSERT_ORDER);
00384 }
00385 
00386 /* static */ bool AIOrder::InsertConditionalOrder(VehicleID vehicle_id, OrderPosition order_position, OrderPosition jump_to)
00387 {
00388   /* IsValidVehicleOrder is not good enough because it does not allow appending. */
00389   if (order_position == ORDER_CURRENT) order_position = AIOrder::ResolveOrderPosition(vehicle_id, order_position);
00390 
00391   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00392   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, jump_to));
00393 
00394   Order order;
00395   order.MakeConditional(jump_to);
00396 
00397   return AIObject::DoCommand(0, vehicle_id | (order_position << 16), order.Pack(), CMD_INSERT_ORDER);
00398 }
00399 
00400 /* static */ bool AIOrder::RemoveOrder(VehicleID vehicle_id, OrderPosition order_position)
00401 {
00402   order_position = AIOrder::ResolveOrderPosition(vehicle_id, order_position);
00403 
00404   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position));
00405 
00406   return AIObject::DoCommand(0, vehicle_id, order_position, CMD_DELETE_ORDER);
00407 }
00408 
00409 /* static */ bool AIOrder::SkipToOrder(VehicleID vehicle_id, OrderPosition next_order)
00410 {
00411   next_order = AIOrder::ResolveOrderPosition(vehicle_id, next_order);
00412 
00413   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, next_order));
00414 
00415   return AIObject::DoCommand(0, vehicle_id, next_order, CMD_SKIP_TO_ORDER);
00416 }
00417 
00426 static void _DoCommandReturnSetOrderFlags(class AIInstance *instance)
00427 {
00428   AIObject::SetLastCommandRes(AIOrder::_SetOrderFlags());
00429   AIInstance::DoCommandReturn(instance);
00430 }
00431 
00432 /* static */ bool AIOrder::_SetOrderFlags()
00433 {
00434   /* Make sure we don't go into an infinite loop */
00435   int retry = AIObject::GetCallbackVariable(3) - 1;
00436   if (retry < 0) {
00437     DEBUG(ai, 0, "Possible infinite loop in SetOrderFlags() detected");
00438     return false;
00439   }
00440   AIObject::SetCallbackVariable(3, retry);
00441 
00442   VehicleID vehicle_id = (VehicleID)AIObject::GetCallbackVariable(0);
00443   OrderPosition order_position = (OrderPosition)AIObject::GetCallbackVariable(1);
00444   AIOrderFlags order_flags = (AIOrderFlags)AIObject::GetCallbackVariable(2);
00445 
00446   order_position = AIOrder::ResolveOrderPosition(vehicle_id, order_position);
00447 
00448   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position));
00449   EnforcePrecondition(false, AreOrderFlagsValid(GetOrderDestination(vehicle_id, order_position), order_flags));
00450 
00451   const Order *order = Vehicle::Get(vehicle_id)->GetOrder(order_position);
00452 
00453   AIOrderFlags current = GetOrderFlags(vehicle_id, order_position);
00454 
00455   if ((current & AIOF_NON_STOP_FLAGS) != (order_flags & AIOF_NON_STOP_FLAGS)) {
00456     return AIObject::DoCommand(0, vehicle_id | (order_position << 16), (order_flags & AIOF_NON_STOP_FLAGS) << 4 | MOF_NON_STOP, CMD_MODIFY_ORDER, NULL, &_DoCommandReturnSetOrderFlags);
00457   }
00458 
00459   switch (order->GetType()) {
00460     case OT_GOTO_DEPOT:
00461       if ((current & AIOF_DEPOT_FLAGS) != (order_flags & AIOF_DEPOT_FLAGS)) {
00462         uint data = DA_ALWAYS_GO;
00463         if (order_flags & AIOF_SERVICE_IF_NEEDED) data = DA_SERVICE;
00464         if (order_flags & AIOF_STOP_IN_DEPOT) data = DA_STOP;
00465         return AIObject::DoCommand(0, vehicle_id | (order_position << 16), (data << 4) | MOF_DEPOT_ACTION, CMD_MODIFY_ORDER, NULL, &_DoCommandReturnSetOrderFlags);
00466       }
00467       break;
00468 
00469     case OT_GOTO_STATION:
00470       if ((current & AIOF_UNLOAD_FLAGS) != (order_flags & AIOF_UNLOAD_FLAGS)) {
00471         return AIObject::DoCommand(0, vehicle_id | (order_position << 16), (order_flags & AIOF_UNLOAD_FLAGS) << 2 | MOF_UNLOAD, CMD_MODIFY_ORDER, NULL, &_DoCommandReturnSetOrderFlags);
00472       }
00473       if ((current & AIOF_LOAD_FLAGS) != (order_flags & AIOF_LOAD_FLAGS)) {
00474         return AIObject::DoCommand(0, vehicle_id | (order_position << 16), (order_flags & AIOF_LOAD_FLAGS) >> 1 | MOF_LOAD, CMD_MODIFY_ORDER, NULL, &_DoCommandReturnSetOrderFlags);
00475       }
00476       break;
00477 
00478     default: break;
00479   }
00480 
00481   assert(GetOrderFlags(vehicle_id, order_position) == order_flags);
00482 
00483   return true;
00484 }
00485 
00486 /* static */ bool AIOrder::SetOrderFlags(VehicleID vehicle_id, OrderPosition order_position, AIOrder::AIOrderFlags order_flags)
00487 {
00488   AIObject::SetCallbackVariable(0, vehicle_id);
00489   AIObject::SetCallbackVariable(1, order_position);
00490   AIObject::SetCallbackVariable(2, order_flags);
00491   /* In case another client(s) change orders at the same time we could
00492    * end in an infinite loop. This stops that from happening ever. */
00493   AIObject::SetCallbackVariable(3, 8);
00494   return AIOrder::_SetOrderFlags();
00495 }
00496 
00497 /* static */ bool AIOrder::MoveOrder(VehicleID vehicle_id, OrderPosition order_position_move, OrderPosition order_position_target)
00498 {
00499   order_position_move   = AIOrder::ResolveOrderPosition(vehicle_id, order_position_move);
00500   order_position_target = AIOrder::ResolveOrderPosition(vehicle_id, order_position_target);
00501 
00502   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position_move));
00503   EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position_target));
00504 
00505   return AIObject::DoCommand(0, vehicle_id, order_position_move | (order_position_target << 16), CMD_MOVE_ORDER);
00506 }
00507 
00508 /* static */ bool AIOrder::CopyOrders(VehicleID vehicle_id, VehicleID main_vehicle_id)
00509 {
00510   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00511   EnforcePrecondition(false, AIVehicle::IsValidVehicle(main_vehicle_id));
00512 
00513   return AIObject::DoCommand(0, vehicle_id | (main_vehicle_id << 16), CO_COPY, CMD_CLONE_ORDER);
00514 }
00515 
00516 /* static */ bool AIOrder::ShareOrders(VehicleID vehicle_id, VehicleID main_vehicle_id)
00517 {
00518   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00519   EnforcePrecondition(false, AIVehicle::IsValidVehicle(main_vehicle_id));
00520 
00521   return AIObject::DoCommand(0, vehicle_id | (main_vehicle_id << 16), CO_SHARE, CMD_CLONE_ORDER);
00522 }
00523 
00524 /* static */ bool AIOrder::UnshareOrders(VehicleID vehicle_id)
00525 {
00526   EnforcePrecondition(false, AIVehicle::IsValidVehicle(vehicle_id));
00527 
00528   return AIObject::DoCommand(0, vehicle_id, CO_UNSHARE, CMD_CLONE_ORDER);
00529 }

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