# ai_event.cpp

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    00001 /* $Id$ */
    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 "../../stdafx.h"
    00013 #include "ai_event_types.hpp"
    00014
    00015 #include <queue>
    00016
    00018 struct AIEventData {
    00019   std::queue<AIEvent *> stack;
    00020 };
    00021
    00022 /* static */ void AIEventController::CreateEventPointer()
    00023 {
    00024   assert(AIObject::GetEventPointer() == NULL);
    00025
    00026   AIObject::GetEventPointer() = new AIEventData();
    00027 }
    00028
    00029 /* static */ void AIEventController::FreeEventPointer()
    00030 {
    00031   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
    00032
    00033   /* Free all waiting events (if any) */
    00034   while (!data->stack.empty()) {
    00035     AIEvent *e = data->stack.front();
    00036     data->stack.pop();
    00037     e->Release();
    00038   }
    00039
    00040   /* Now kill our data pointer */
    00041   delete data;
    00042 }
    00043
    00044 /* static */ bool AIEventController::IsEventWaiting()
    00045 {
    00046   if (AIObject::GetEventPointer() == NULL) AIEventController::CreateEventPointer();
    00047   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
    00048
    00049   return !data->stack.empty();
    00050 }
    00051
    00052 /* static */ AIEvent *AIEventController::GetNextEvent()
    00053 {
    00054   if (AIObject::GetEventPointer() == NULL) AIEventController::CreateEventPointer();
    00055   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
    00056
    00057   if (data->stack.empty()) return NULL;
    00058
    00059   AIEvent *e = data->stack.front();
    00060   data->stack.pop();
    00061   return e;
    00062 }
    00063
    00064 /* static */ void AIEventController::InsertEvent(AIEvent *event)
    00065 {
    00066   if (AIObject::GetEventPointer() == NULL) AIEventController::CreateEventPointer();
    00067   AIEventData *data = (AIEventData *)AIObject::GetEventPointer();
    00068
    00069   event->AddRef();
    00070   data->stack.push(event);
    00071 }
    00072