1 /*

     2  * Copyright 1996-2003 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.awt.motif;

    27 

    28 import java.awt.datatransfer.ClipboardOwner;

    29 import java.awt.datatransfer.Transferable;

    30 

    31 import java.io.IOException;

    32 

    33 import java.security.AccessController;

    34 

    35 import sun.awt.datatransfer.SunClipboard;

    36 import sun.awt.datatransfer.TransferableProxy;

    37 import sun.awt.datatransfer.DataTransferer;

    38 

    39 import sun.security.action.GetIntegerAction;

    40 

    41 

    42 /**

    43  * A class which interfaces with the X11 selection service in order to support

    44  * data transfer via Clipboard operations. Most of the work is provided by

    45  * sun.awt.datatransfer.DataTransferer.

    46  *

    47  * @author Amy Fowler

    48  * @author Roger Brinkley

    49  * @author Danila Sinopalnikov

    50  * @author Alexander Gerasimov

    51  *

    52  * @since JDK1.1

    53  */

    54 public class X11Clipboard extends SunClipboard implements X11SelectionHolder {

    55 

    56     private final X11Selection clipboardSelection;

    57 

    58     private static final Object classLock = new Object();

    59 

    60     private static final int defaultPollInterval = 200;

    61 

    62     private static int pollInterval;

    63 

    64     private static int listenedClipboardsCount;

    65 

    66     /**

    67      * Creates a system clipboard object.

    68      */

    69     public X11Clipboard(String name, String selectionName) {

    70         super(name);

    71         clipboardSelection = new X11Selection(selectionName, this);

    72     }

    73 

    74     protected void setContentsNative(Transferable contents) {

    75         if (!clipboardSelection.getSelectionOwnership(contents, this)) {

    76             // Need to figure out how to inform owner the request failed...

    77             this.owner = null;

    78             this.contents = null;

    79         }

    80     }

    81 

    82     public long getID() {

    83         return clipboardSelection.atom;

    84     }

    85 

    86     // NOTE: This method may be called by privileged threads.

    87     //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!

    88     public void lostSelectionOwnership() {

    89         lostOwnershipImpl();

    90     }

    91 

    92     protected void clearNativeContext() {

    93         clipboardSelection.clearNativeContext();

    94     }

    95 

    96     protected long[] getClipboardFormats() {

    97         return getClipboardFormats(getID());

    98     }

    99     private static native long[] getClipboardFormats(long clipboardID);

   100 

   101     protected byte[] getClipboardData(long format)

   102           throws IOException {

   103         return getClipboardData(getID(), format);

   104     }

   105     private static native byte[] getClipboardData(long clipboardID, long format)

   106             throws IOException;

   107 

   108 

   109     // Called on the toolkit thread under awtLock.

   110     public void checkChange(long[] formats) {

   111         if (!clipboardSelection.isOwner()) {

   112             super.checkChange(formats);

   113         }

   114     }

   115 

   116     void checkChangeHere(Transferable contents) {

   117         if (areFlavorListenersRegistered()) {

   118             super.checkChange(DataTransferer.getInstance().

   119                         getFormatsForTransferableAsArray(contents, flavorMap));

   120         }

   121     }

   122 

   123     protected void registerClipboardViewerChecked() {

   124         if (pollInterval <= 0) {

   125             pollInterval = ((Integer)AccessController.doPrivileged(

   126                     new GetIntegerAction("awt.datatransfer.clipboard.poll.interval",

   127                                          defaultPollInterval))).intValue();

   128             if (pollInterval <= 0) {

   129                 pollInterval = defaultPollInterval;

   130             }

   131         }

   132         synchronized (X11Clipboard.classLock) {

   133             if (listenedClipboardsCount++ == 0) {

   134                 registerClipboardViewer(pollInterval);

   135             }

   136         }

   137     }

   138 

   139     private native void registerClipboardViewer(int pollInterval);

   140 

   141     protected void unregisterClipboardViewerChecked() {

   142         synchronized (X11Clipboard.classLock) {

   143             if (--listenedClipboardsCount == 0) {

   144                 unregisterClipboardViewer();

   145             }

   146         }

   147     }

   148 

   149     private native void unregisterClipboardViewer();

   150 

   151 }