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