ai_event.cpp

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00001 /* $Id: ai_event.cpp 17248 2009-08-21 20:21:05Z rubidium $ */
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 "ai_event_types.hpp"
00013 
00014 #include <queue>
00015 
00016 struct AIEventData {
00017   std::queue<AIEvent *> stack;
00018 };
00019 
00020 /* static */ void AIEventController::CreateEventPointer()
00021 {
00022   assert(AIObject::GetEventPointer() == NULL);
00023 
00024   AIObject::GetEventPointer() = new AIEventData();
00025 }
00026 
00027 /* static */ void AIEventController::FreeEventPointer()
00028 {
00029   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
00030 
00031   /* Free all waiting events (if any) */
00032   while (!data->stack.empty()) {
00033     AIEvent *e = data->stack.front();
00034     data->stack.pop();
00035     e->Release();
00036   }
00037 
00038   /* Now kill our data pointer */
00039   delete data;
00040 }
00041 
00042 /* static */ bool AIEventController::IsEventWaiting()
00043 {
00044   if (AIObject::GetEventPointer() == NULL) AIEventController::CreateEventPointer();
00045   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
00046 
00047   return !data->stack.empty();
00048 }
00049 
00050 /* static */ AIEvent *AIEventController::GetNextEvent()
00051 {
00052   if (AIObject::GetEventPointer() == NULL) AIEventController::CreateEventPointer();
00053   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
00054 
00055   if (data->stack.empty()) return NULL;
00056 
00057   AIEvent *e = data->stack.front();
00058   data->stack.pop();
00059   return e;
00060 }
00061 
00062 /* static */ void AIEventController::InsertEvent(AIEvent *event)
00063 {
00064   if (AIObject::GetEventPointer() == NULL) AIEventController::CreateEventPointer();
00065   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
00066 
00067   event->AddRef();
00068   data->stack.push(event);
00069 }
00070 

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