112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file autoreplace.cpp Management of replacement lists. */
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#include "stdafx.h"
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#include "command_func.h"
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#include "group.h"
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#include "autoreplace_base.h"
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#include "core/pool_func.hpp"
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EngineRenewPool _enginerenew_pool("EngineRenew");
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INSTANTIATE_POOL_METHODS(EngineRenew)
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/**
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* Retrieves the EngineRenew that specifies the replacement of the given
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* engine type from the given renewlist
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*/
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static EngineRenew *GetEngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
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{
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EngineRenew *er = (EngineRenew *)erl;
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while (er) {
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if (er->from == engine && er->group_id == group) return er;
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er = er->next;
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}
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return NULL;
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}
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void RemoveAllEngineReplacement(EngineRenewList *erl)
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{
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EngineRenew *er = (EngineRenew *)(*erl);
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EngineRenew *next;
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while (er != NULL) {
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next = er->next;
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delete er;
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er = next;
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}
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*erl = NULL; // Empty list
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}
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EngineID EngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
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{
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const EngineRenew *er = GetEngineReplacement(erl, engine, group);
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if (er == NULL && (group == DEFAULT_GROUP || (Group::IsValidID(group) && !Group::Get(group)->replace_protection))) {
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/* We didn't find anything useful in the vehicle's own group so we will try ALL_GROUP */
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er = GetEngineReplacement(erl, engine, ALL_GROUP);
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}
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return er == NULL ? INVALID_ENGINE : er->to;
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}
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CommandCost AddEngineReplacement(EngineRenewList *erl, EngineID old_engine, EngineID new_engine, GroupID group, DoCommandFlag flags)
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{
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/* Check if the old vehicle is already in the list */
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EngineRenew *er = GetEngineReplacement(*erl, old_engine, group);
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if (er != NULL) {
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if (flags & DC_EXEC) er->to = new_engine;
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return CommandCost();
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}
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if (!EngineRenew::CanAllocateItem()) return CMD_ERROR;
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if (flags & DC_EXEC) {
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er = new EngineRenew(old_engine, new_engine);
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er->group_id = group;
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/* Insert before the first element */
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er->next = (EngineRenew *)(*erl);
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*erl = (EngineRenewList)er;
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}
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return CommandCost();
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}
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CommandCost RemoveEngineReplacement(EngineRenewList *erl, EngineID engine, GroupID group, DoCommandFlag flags)
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{
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EngineRenew *er = (EngineRenew *)(*erl);
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EngineRenew *prev = NULL;
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while (er) {
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if (er->from == engine && er->group_id == group) {
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if (flags & DC_EXEC) {
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if (prev == NULL) { // First element
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/* The second becomes the new first element */
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*erl = (EngineRenewList)er->next;
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} else {
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/* Cut this element out */
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prev->next = er->next;
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}
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delete er;
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}
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return CommandCost();
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}
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prev = er;
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er = er->next;
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}
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return CMD_ERROR;
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}
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void InitializeEngineRenews()
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{
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_enginerenew_pool.CleanPool();
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}
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