autoreplace.cpp

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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 
00018 EngineRenewPool _enginerenew_pool("EngineRenew");
00019 INSTANTIATE_POOL_METHODS(EngineRenew)
00020 
00021 
00025 static EngineRenew *GetEngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
00026 {
00027   EngineRenew *er = (EngineRenew *)erl;
00028 
00029   while (er) {
00030     if (er->from == engine && er->group_id == group) return er;
00031     er = er->next;
00032   }
00033   return NULL;
00034 }
00035 
00041 void RemoveAllEngineReplacement(EngineRenewList *erl)
00042 {
00043   EngineRenew *er = (EngineRenew *)(*erl);
00044   EngineRenew *next;
00045 
00046   while (er != NULL) {
00047     next = er->next;
00048     delete er;
00049     er = next;
00050   }
00051   *erl = NULL; // Empty list
00052 }
00053 
00062 EngineID EngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
00063 {
00064   const EngineRenew *er = GetEngineReplacement(erl, engine, group);
00065   if (er == NULL && (group == DEFAULT_GROUP || (Group::IsValidID(group) && !Group::Get(group)->replace_protection))) {
00066     /* We didn't find anything useful in the vehicle's own group so we will try ALL_GROUP */
00067     er = GetEngineReplacement(erl, engine, ALL_GROUP);
00068   }
00069   return er == NULL ? INVALID_ENGINE : er->to;
00070 }
00071 
00081 CommandCost AddEngineReplacement(EngineRenewList *erl, EngineID old_engine, EngineID new_engine, GroupID group, DoCommandFlag flags)
00082 {
00083   /* Check if the old vehicle is already in the list */
00084   EngineRenew *er = GetEngineReplacement(*erl, old_engine, group);
00085   if (er != NULL) {
00086     if (flags & DC_EXEC) er->to = new_engine;
00087     return CommandCost();
00088   }
00089 
00090   if (!EngineRenew::CanAllocateItem()) return CMD_ERROR;
00091 
00092   if (flags & DC_EXEC) {
00093     er = new EngineRenew(old_engine, new_engine);
00094     er->group_id = group;
00095 
00096     /* Insert before the first element */
00097     er->next = (EngineRenew *)(*erl);
00098     *erl = (EngineRenewList)er;
00099   }
00100 
00101   return CommandCost();
00102 }
00103 
00112 CommandCost RemoveEngineReplacement(EngineRenewList *erl, EngineID engine, GroupID group, DoCommandFlag flags)
00113 {
00114   EngineRenew *er = (EngineRenew *)(*erl);
00115   EngineRenew *prev = NULL;
00116 
00117   while (er) {
00118     if (er->from == engine && er->group_id == group) {
00119       if (flags & DC_EXEC) {
00120         if (prev == NULL) { // First element
00121           /* The second becomes the new first element */
00122           *erl = (EngineRenewList)er->next;
00123         } else {
00124           /* Cut this element out */
00125           prev->next = er->next;
00126         }
00127         delete er;
00128       }
00129       return CommandCost();
00130     }
00131     prev = er;
00132     er = er->next;
00133   }
00134 
00135   return CMD_ERROR;
00136 }
00137 
00138 void InitializeEngineRenews()
00139 {
00140   _enginerenew_pool.CleanPool();
00141 }

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