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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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/**
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* \file
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* \brief Target platform dependent Java module for Symbian.
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*
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*/
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package com.nokia.microedition.m2g;
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import javax.microedition.lcdui.Graphics;
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import javax.microedition.lcdui.Image;
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import org.eclipse.swt.widgets.Display;
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import com.nokia.mj.impl.nokialcdui.LCDUIInvoker;
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import org.eclipse.swt.internal.extension.DisplayExtension;
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import org.eclipse.swt.internal.extension.Toolkit;
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/**
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* Implements platform-dependent functionality. At the moment, this
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* includes native finalization and some helper methods for
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* synchronizing 2D and 3D rendering.
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*/
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class Platform
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{
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/**
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* eSWT display for ui thread access
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*/
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private static Display display = null;
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private static boolean libraryLoaded = false;
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//------------------------------------------------------------------
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// Package private methods
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//------------------------------------------------------------------
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/**
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* Executes given runnable in UI thread if caller thread is not UI thread
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*/
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static void executeInUIThread(M2GRunnableQt obj)
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{
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if (display == null)
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{
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if (!uiThreadAvailable())
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{
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throw new Error("Ui thread not available");
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}
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}
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if (display.isDisposed())
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{
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throw new Error("Display already disposed");
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}
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if (obj != null)
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{
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// If we are not in UI thread use display
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if (Thread.currentThread() != display.getThread())
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{
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display.syncExec(obj);
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}
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else
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{
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// In this case we are in UI thread so just execute directly
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obj.run();
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}
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// Check if any exceptions occured in execution
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// and throw forward in caller thread
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obj.checkAndThrow();
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}
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}
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/**
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* Check the UI thread / toolkit init status and store display if it is available
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* @return true if either lcdui or eswt toolkit is initialized and ui thread is accessible
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* otherwise false
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*/
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static boolean uiThreadAvailable()
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{
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if (display != null)
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{
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return true;
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}
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else
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{
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//display = DisplayExtension.getDisplayInstance();
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//As now the thread is always available we are taking it from Toolkit.
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display = Toolkit. getInternalDisplay();
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if (display == null)
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{
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return false;
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}
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else
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{
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// UI thread is available, so load native library if not already loaded
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if (!libraryLoaded)
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{
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com.nokia.mj.impl.rt.support.Jvm.loadSystemLibrary("javam2g");
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libraryLoaded = true;
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}
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return true;
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}
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}
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}
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static final void finalizeObject(int handle)
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{
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try
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{
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final int finalHandle = handle;
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executeInUIThread(
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new M2GRunnableQt()
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{
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void doRun()
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{
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_finalizeObject(finalHandle);
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}
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});
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}
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catch (Exception e)
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{
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// do nothing
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}
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}
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//------------------------------------------------------------------
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// Private methods
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//------------------------------------------------------------------
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/**
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* Trigger GC if minimum free memory limit has been exceeded in the native side
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*/
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static final void heuristicGC()
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{
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}
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private static final native void _finalizeObject(int handle);
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}
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