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/* $Id$ */
/** @file autoreplace.cpp Management of replacement lists. */
#include "stdafx.h"
#include "command_func.h"
#include "group.h"
#include "autoreplace_base.h"
#include "oldpool_func.h"
DEFINE_OLD_POOL_GENERIC(EngineRenew, EngineRenew)
/**
* Retrieves the EngineRenew that specifies the replacement of the given
* engine type from the given renewlist */
static EngineRenew *GetEngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
{
EngineRenew *er = (EngineRenew *)erl;
while (er) {
if (er->from == engine && er->group_id == group) return er;
er = er->next;
}
return NULL;
}
void RemoveAllEngineReplacement(EngineRenewList *erl)
{
EngineRenew *er = (EngineRenew *)(*erl);
EngineRenew *next;
while (er != NULL) {
next = er->next;
delete er;
er = next;
}
*erl = NULL; // Empty list
}
EngineID EngineReplacement(EngineRenewList erl, EngineID engine, GroupID group)
{
const EngineRenew *er = GetEngineReplacement(erl, engine, group);
if (er == NULL && (group == DEFAULT_GROUP || (IsValidGroupID(group) && !GetGroup(group)->replace_protection))) {
/* We didn't find anything useful in the vehicle's own group so we will try ALL_GROUP */
er = GetEngineReplacement(erl, engine, ALL_GROUP);
}
return er == NULL ? INVALID_ENGINE : er->to;
}
CommandCost AddEngineReplacement(EngineRenewList *erl, EngineID old_engine, EngineID new_engine, GroupID group, DoCommandFlag flags)
{
EngineRenew *er;
/* Check if the old vehicle is already in the list */
er = GetEngineReplacement(*erl, old_engine, group);
if (er != NULL) {
if (flags & DC_EXEC) er->to = new_engine;
return CommandCost();
}
if (!EngineRenew::CanAllocateItem()) return CMD_ERROR;
if (flags & DC_EXEC) {
er = new EngineRenew(old_engine, new_engine);
er->group_id = group;
/* Insert before the first element */
er->next = (EngineRenew *)(*erl);
*erl = (EngineRenewList)er;
}
return CommandCost();
}
CommandCost RemoveEngineReplacement(EngineRenewList *erl, EngineID engine, GroupID group, DoCommandFlag flags)
{
EngineRenew *er = (EngineRenew *)(*erl);
EngineRenew *prev = NULL;
while (er)
{
if (er->from == engine && er->group_id == group) {
if (flags & DC_EXEC) {
if (prev == NULL) { // First element
/* The second becomes the new first element */
*erl = (EngineRenewList)er->next;
} else {
/* Cut this element out */
prev->next = er->next;
}
delete er;
}
return CommandCost();
}
prev = er;
er = er->next;
}
return CMD_ERROR;
}
void InitializeEngineRenews()
{
/* Clean the engine renew pool and create 1 block in it */
_EngineRenew_pool.CleanPool();
_EngineRenew_pool.AddBlockToPool();
}
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