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