mirror of https://github.com/OpenTTD/OpenTTD.git
241 lines
8.0 KiB
C++
241 lines
8.0 KiB
C++
/*
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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 cargoaction.cpp Implementation of cargo actions. */
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#include "stdafx.h"
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#include "economy_base.h"
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#include "cargoaction.h"
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#include "station_base.h"
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#include "safeguards.h"
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/**
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* Decides if a packet needs to be split.
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* @param cp Packet to be either split or moved in one piece.
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* @return Either new packet if splitting was necessary or the given one
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* otherwise.
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*/
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template<class Tsource, class Tdest>
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CargoPacket *CargoMovement<Tsource, Tdest>::Preprocess(CargoPacket *cp)
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{
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if (this->max_move < cp->Count()) {
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cp = cp->Split(this->max_move);
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this->max_move = 0;
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} else {
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this->max_move -= cp->Count();
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}
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return cp;
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}
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/**
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* Determines the amount of cargo to be removed from a packet and removes that
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* from the metadata of the list.
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* @param cp Packet to be removed completely or partially.
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* @return Amount of cargo to be removed.
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*/
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template<class Tsource>
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uint CargoRemoval<Tsource>::Preprocess(CargoPacket *cp)
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{
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if (this->max_move >= cp->Count()) {
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this->max_move -= cp->Count();
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return cp->Count();
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} else {
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uint ret = this->max_move;
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this->max_move = 0;
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return ret;
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}
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}
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/**
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* Finalize cargo removal. Either delete the packet or reduce it.
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* @param cp Packet to be removed or reduced.
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* @param remove Amount of cargo to be removed.
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* @return True if the packet was deleted, False if it was reduced.
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*/
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template<class Tsource>
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bool CargoRemoval<Tsource>::Postprocess(CargoPacket *cp, uint remove)
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{
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if (remove == cp->Count()) {
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delete cp;
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return true;
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} else {
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cp->Reduce(remove);
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return false;
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}
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}
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/**
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* Removes some cargo from a StationCargoList.
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* @param cp Packet to be removed.
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* @return True if the packet was completely delivered, false if only part of
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* it was.
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*/
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template<>
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bool CargoRemoval<StationCargoList>::operator()(CargoPacket *cp)
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{
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uint remove = this->Preprocess(cp);
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this->source->RemoveFromCache(cp, remove);
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return this->Postprocess(cp, remove);
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}
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/**
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* Removes some cargo from a VehicleCargoList.
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* @param cp Packet to be removed.
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* @return True if the packet was completely delivered, false if only part of
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* it was.
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*/
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template<>
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bool CargoRemoval<VehicleCargoList>::operator()(CargoPacket *cp)
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{
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uint remove = this->Preprocess(cp);
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this->source->RemoveFromMeta(cp, VehicleCargoList::MTA_KEEP, remove);
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return this->Postprocess(cp, remove);
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}
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/**
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* Delivers some cargo.
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* @param cp Packet to be delivered.
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* @return True if the packet was completely delivered, false if only part of
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* it was.
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*/
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bool CargoDelivery::operator()(CargoPacket *cp)
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{
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uint remove = this->Preprocess(cp);
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this->source->RemoveFromMeta(cp, VehicleCargoList::MTA_DELIVER, remove);
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this->payment->PayFinalDelivery(cp, remove, this->current_tile);
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return this->Postprocess(cp, remove);
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}
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/**
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* Loads some cargo onto a vehicle.
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* @param cp Packet to be loaded.
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* @return True if the packet was completely loaded, false if part of it was.
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*/
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bool CargoLoad::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) return false;
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cp_new->UpdateLoadingTile(this->current_tile);
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this->source->RemoveFromCache(cp_new, cp_new->Count());
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this->destination->Append(cp_new, VehicleCargoList::MTA_KEEP);
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return cp_new == cp;
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}
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/**
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* Reserves some cargo for loading.
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* @param cp Packet to be reserved.
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* @return True if the packet was completely reserved, false if part of it was.
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*/
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bool CargoReservation::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) return false;
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cp_new->UpdateLoadingTile(this->current_tile);
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this->source->reserved_count += cp_new->Count();
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this->source->RemoveFromCache(cp_new, cp_new->Count());
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this->destination->Append(cp_new, VehicleCargoList::MTA_LOAD);
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return cp_new == cp;
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}
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/**
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* Returns some reserved cargo.
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* @param cp Packet to be returned.
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* @return True if the packet was completely returned, false if part of it was.
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*/
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bool CargoReturn::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) cp_new = cp;
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assert(cp_new->Count() <= this->destination->reserved_count);
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cp_new->UpdateUnloadingTile(this->current_tile);
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this->source->RemoveFromMeta(cp_new, VehicleCargoList::MTA_LOAD, cp_new->Count());
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this->destination->reserved_count -= cp_new->Count();
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this->destination->Append(cp_new, this->next);
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return cp_new == cp;
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}
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/**
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* Transfers some cargo from a vehicle to a station.
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* @param cp Packet to be transferred.
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* @return True if the packet was completely reserved, false if part of it was.
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*/
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bool CargoTransfer::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) return false;
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cp_new->UpdateUnloadingTile(this->current_tile);
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this->source->RemoveFromMeta(cp_new, VehicleCargoList::MTA_TRANSFER, cp_new->Count());
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/* No transfer credits here as they were already granted during Stage(). */
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this->destination->Append(cp_new, cp_new->GetNextHop());
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return cp_new == cp;
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}
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/**
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* Shifts some cargo from a vehicle to another one.
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* @param cp Packet to be shifted.
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* @return True if the packet was completely shifted, false if part of it was.
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*/
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bool CargoShift::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) cp_new = cp;
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this->source->RemoveFromMeta(cp_new, VehicleCargoList::MTA_KEEP, cp_new->Count());
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this->destination->Append(cp_new, VehicleCargoList::MTA_KEEP);
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return cp_new == cp;
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}
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/**
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* Reroutes some cargo from one Station sublist to another.
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* @param cp Packet to be rerouted.
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* @return True if the packet was completely rerouted, false if part of it was.
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*/
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bool StationCargoReroute::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) cp_new = cp;
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StationID next = this->ge->GetVia(cp_new->GetFirstStation(), this->avoid, this->avoid2);
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assert(next != this->avoid && next != this->avoid2);
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if (this->source != this->destination) {
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this->source->RemoveFromCache(cp_new, cp_new->Count());
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this->destination->AddToCache(cp_new);
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}
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/* Legal, as insert doesn't invalidate iterators in the MultiMap, however
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* this might insert the packet between range.first and range.second (which might be end())
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* This is why we check for GetKey above to avoid infinite loops. */
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this->destination->packets.Insert(next, cp_new);
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return cp_new == cp;
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}
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/**
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* Reroutes some cargo in a VehicleCargoList.
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* @param cp Packet to be rerouted.
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* @return True if the packet was completely rerouted, false if part of it was.
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*/
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bool VehicleCargoReroute::operator()(CargoPacket *cp)
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{
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CargoPacket *cp_new = this->Preprocess(cp);
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if (cp_new == nullptr) cp_new = cp;
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if (cp_new->GetNextHop() == this->avoid || cp_new->GetNextHop() == this->avoid2) {
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cp->SetNextHop(this->ge->GetVia(cp_new->GetFirstStation(), this->avoid, this->avoid2));
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}
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if (this->source != this->destination) {
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this->source->RemoveFromMeta(cp_new, VehicleCargoList::MTA_TRANSFER, cp_new->Count());
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this->destination->AddToMeta(cp_new, VehicleCargoList::MTA_TRANSFER);
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}
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/* Legal, as front pushing doesn't invalidate iterators in std::list. */
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this->destination->packets.push_front(cp_new);
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return cp_new == cp;
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}
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template uint CargoRemoval<VehicleCargoList>::Preprocess(CargoPacket *cp);
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template uint CargoRemoval<StationCargoList>::Preprocess(CargoPacket *cp);
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template bool CargoRemoval<VehicleCargoList>::Postprocess(CargoPacket *cp, uint remove);
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template bool CargoRemoval<StationCargoList>::Postprocess(CargoPacket *cp, uint remove);
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