autoreplace.cpp

Go to the documentation of this file.
00001 /* $Id$ */
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 "stdafx.h"
00013 #include "command_func.h"
00014 #include "group.h"
00015 #include "autoreplace_base.h"
00016 #include "core/pool_func.hpp"
00017 
00019 EngineRenewPool _enginerenew_pool("EngineRenew");
00020 INSTANTIATE_POOL_METHODS(EngineRenew)
00021 
00022 
00026 static EngineRenew *GetEngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
00027 {
00028   EngineRenew *er = (EngineRenew *)erl;
00029 
00030   while (er != NULL) {
00031     if (er->from == engine && er->group_id == group) return er;
00032     er = er->next;
00033   }
00034   return NULL;
00035 }
00036 
00042 void RemoveAllEngineReplacement(EngineRenewList *erl)
00043 {
00044   EngineRenew *er = (EngineRenew *)(*erl);
00045   EngineRenew *next;
00046 
00047   while (er != NULL) {
00048     next = er->next;
00049     delete er;
00050     er = next;
00051   }
00052   *erl = NULL; // Empty list
00053 }
00054 
00063 EngineID EngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
00064 {
00065   const EngineRenew *er = GetEngineReplacement(erl, engine, group);
00066   if (er == NULL && (group == DEFAULT_GROUP || (Group::IsValidID(group) && !Group::Get(group)->replace_protection))) {
00067     /* We didn't find anything useful in the vehicle's own group so we will try ALL_GROUP */
00068     er = GetEngineReplacement(erl, engine, ALL_GROUP);
00069   }
00070   return er == NULL ? INVALID_ENGINE : er->to;
00071 }
00072 
00082 CommandCost AddEngineReplacement(EngineRenewList *erl, EngineID old_engine, EngineID new_engine, GroupID group, DoCommandFlag flags)
00083 {
00084   /* Check if the old vehicle is already in the list */
00085   EngineRenew *er = GetEngineReplacement(*erl, old_engine, group);
00086   if (er != NULL) {
00087     if (flags & DC_EXEC) er->to = new_engine;
00088     return CommandCost();
00089   }
00090 
00091   if (!EngineRenew::CanAllocateItem()) return CMD_ERROR;
00092 
00093   if (flags & DC_EXEC) {
00094     er = new EngineRenew(old_engine, new_engine);
00095     er->group_id = group;
00096 
00097     /* Insert before the first element */
00098     er->next = (EngineRenew *)(*erl);
00099     *erl = (EngineRenewList)er;
00100   }
00101 
00102   return CommandCost();
00103 }
00104 
00113 CommandCost RemoveEngineReplacement(EngineRenewList *erl, EngineID engine, GroupID group, DoCommandFlag flags)
00114 {
00115   EngineRenew *er = (EngineRenew *)(*erl);
00116   EngineRenew *prev = NULL;
00117 
00118   while (er != NULL) {
00119     if (er->from == engine && er->group_id == group) {
00120       if (flags & DC_EXEC) {
00121         if (prev == NULL) { // First element
00122           /* The second becomes the new first element */
00123           *erl = (EngineRenewList)er->next;
00124         } else {
00125           /* Cut this element out */
00126           prev->next = er->next;
00127         }
00128         delete er;
00129       }
00130       return CommandCost();
00131     }
00132     prev = er;
00133     er = er->next;
00134   }
00135 
00136   return CMD_ERROR;
00137 }

Generated on Sun May 8 07:30:10 2011 for OpenTTD by  doxygen 1.6.1