/************************************************************************* * * $RCSfile: ViewContainer.java,v $ * * $Revision: 1.2 $ * * last change: $Author: vg $ $Date: 2003-06-10 10:31:38 $ * * The Contents of this file are made available subject to the terms of * either of the following licenses * * - GNU Lesser General Public License Version 2.1 * - Sun Industry Standards Source License Version 1.1 * * Sun Microsystems Inc., October, 2000 * * GNU Lesser General Public License Version 2.1 * ============================================= * Copyright 2000 by Sun Microsystems, Inc. * 901 San Antonio Road, Palo Alto, CA 94303, USA * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License version 2.1, as published by the Free Software Foundation. * * This library 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. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * * * Sun Industry Standards Source License Version 1.1 * ================================================= * The contents of this file are subject to the Sun Industry Standards * Source License Version 1.1 (the "License"); You may not use this file * except in compliance with the License. You may obtain a copy of the * License at http://www.openoffice.org/license.html. * * Software provided under this License is provided on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, * WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS, * MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING. * See the License for the specific provisions governing your rights and * obligations concerning the Software. * * The Initial Developer of the Original Code is: Sun Microsystems, Inc. * * Copyright: 2000 by Sun Microsystems, Inc. * * All Rights Reserved. * * Contributor(s): _______________________________________ * * ************************************************************************/ package OfficeDev.samples.DesktopEnvironment; // __________ Imports __________ // interfaces // helper import com.sun.star.uno.UnoRuntime; // UI classes // events // base classes import java.lang.*; import java.util.*; // __________ Implementation __________ /** * It's implement a static container which hold * all opened documents and her views alive. * It's possible to register/deregister such views, * to get information about these and it provides * some global functionality - like termination of * this demo application. * * @author Andreas Schlüns * @created 01.03.2002 08:42 */ public class ViewContainer extends Thread { // ____________________ /** * provides a singleton view container * Neccessary for terminate(9 functionality to be able * to call Runtime.runFinilization(). * * @return a reference to the singleton ViewContainer instance */ public static synchronized ViewContainer getGlobalContainer() { if (maSingleton==null) maSingleton=new ViewContainer(); return maSingleton; } // ____________________ /** * ctor * It's private - because nobody should create any instance * expect the only global one, which wil be created by ourself! */ private ViewContainer() { mlViews = new Vector(); mlListener = new Vector(); mbShutdownActive = false ; Runtime.getRuntime().addShutdownHook(this); } // ____________________ /** * This register a new view inside this global container * (if it doesnt already exist). * * @param aView view which whish to be registered inside this container */ public void addView(Object aView) { synchronized(mlViews) { if(mlViews.contains(aView)==false) mlViews.add(aView); } } // ____________________ /** * This deregister a view from this global container. * Normaly it should be the last reference to the view * and her finalize() method should be called. * If last view will be closed here - we terminate these * java application too. Because there is no further * visible frame anymore. * * @param aView * view object which wish to be deregistered */ public void removeView(Object aView) { int nViewCount = 0; synchronized(mlViews) { if(mlViews.contains(aView)==true) mlViews.remove(aView); nViewCount = mlViews.size(); if (nViewCount<1) mlViews = null; } // If this view is a registered shutdown listener on this view container // too, we must call his interface and forget him as possible listener. // It's neccessary to guarantee his dead ... boolean bShutdownView = false; synchronized(mlListener) { bShutdownView = mlListener.contains(aView); if (bShutdownView==true) mlListener.remove(aView); } if (bShutdownView==true) ((IShutdownListener)aView).shutdown(); // We use a system.exit() to finish the whole application. // And further we have registered THIS instance as a possible shutdown // hook at the runtime class. So our run() method will be called. // Teh our view container should be empty - but // our listener container can include some references. // These objects wich to be informed then and release e.g. some // remote references. if (nViewCount<1) { boolean bNeccessary = false; synchronized(this) { bNeccessary = ! mbShutdownActive; } if (bNeccessary==true) { System.out.println("call exit(0)!"); System.exit(0); } } } // ____________________ /** * add/remove listener for possibe shutdown events */ public void addListener( IShutdownListener rListener ) { synchronized(mlListener) { if ( ! mlListener.contains(rListener) ) mlListener.add(rListener); } } // ____________________ public void removeListener( IShutdownListener rListener ) { synchronized(mlListener) { if ( mlListener.contains(rListener) ) mlListener.remove(rListener); } } // ____________________ /** * Is called from current runtime system of the java machine * on shutdown. We inform all current registered listener and * views. They should deinitialize her internal things then. */ public void run() { synchronized(this) { if (mbShutdownActive) return; mbShutdownActive=true; } while( true ) { IShutdownListener aListener = null; synchronized(mlListener) { try{ aListener = (IShutdownListener)mlListener.firstElement(); } catch(java.util.NoSuchElementException exEmpty) {} } if (aListener==null) break; aListener.shutdown(); // May this listener has dergeistered himself. // But if not we must do it for him. Our own // method "removeListener()" ignore requests for // already gone listener objects. removeListener(aListener); } if (mlViews!=null) { synchronized(mlViews) { mlViews.clear(); mlViews = null; } } if (mlListener!=null) { synchronized(mlListener) { mlListener.clear(); mlListener = null; } } } // ____________________ /** * @const BASICNAME it's used to create uinque names for all regieterd views */ private static final String BASICNAME = "Document View "; // ____________________ /** * @member mbInplace indicates using of inplace office frames instead of outplace ones * @member maSingleton singleton instance of this view container * @member mlViews list of all currently registered document views * @member mlListener list of all currently registered shutdown listener * @member mbShutdownActive if this shutdown hook already was started it's not a good idea to * call System.exit() again for other conditions. * We supress it by using this variable! */ public static boolean mbInplace = false ; private static ViewContainer maSingleton = null ; private Vector mlViews ; private Vector mlListener ; private boolean mbShutdownActive ; }