javauis/m2g_qt/javasrc/com/nokia/microedition/m2g/Platform.java
author hgs
Fri, 15 Oct 2010 12:29:39 +0300
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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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    /**
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     * Load Library if not already loaded
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     * 
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    static void loadLibarary()
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    {
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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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    }*/
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    /**
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     * Registers an Object3D in the global handle-to-object map. The
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     * handle of the object must already be set at this point!
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     */
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//    static final void registerFinalizer(Object3D obj)
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//    {
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//        //heuristicGC();
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//    }
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//
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//    /**
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//     * Registers a Graphics3D object (not derived from Object3D) for
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//     * finalization.
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//     */
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//    static final void registerFinalizer(Graphics3D g3d)
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//    {
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//        //heuristicGC();
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//    }
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//
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//    /**
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//     * Registers an Interface object for finalization
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//     */
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//    static final void registerFinalizer(Interface m2G)
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//    {
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//    }
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//
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//    /**
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//     * Registers a Loader object for finalization
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//     */
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//    static final void registerFinalizer(Loader loader)
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//    {
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//    }
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//
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//    /**
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//     * Flushes all pending rendering to a Graphics context and blocks
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//     * until finished
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//     */
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//    static final void sync(Graphics g)
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//    {
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//        //ToolkitInvoker invoker = ToolkitInvoker.getToolkitInvoker();
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//        //invoker.toolkitSync(invoker.getToolkit());
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//    }
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//
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//    /**
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//     * Flushes all pending rendering to an Image object
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//     */
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//    static final void sync(Image img)
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//    {
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//        //ToolkitInvoker invoker = ToolkitInvoker.getToolkitInvoker();
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//        //invoker.toolkitSync(invoker.getToolkit());
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//    }
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//
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//    /**
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//     * Finalizes the native peer of an interface
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//     */
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//    static final native void finalizeInterface(int handle);
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//
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//    /**
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//     * Finalizes the native peer of an object
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//     * JCF: added this wrapper method so we could pass the toolkit handle to the native method.
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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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     * Finalizes the native peer of an object associated with
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     * given Interface instance
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     */
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//    static final void finalizeObject(int handle, Interface aInterface)
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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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//                public 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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