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diff --git a/libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java b/libjava/classpath/gnu/java/awt/peer/gtk/GtkClipboard.java
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+/* GtkClipboard.java
+   Copyright (C) 1999, 2005, 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.awt.peer.gtk;
+
+import gnu.java.lang.CPStringBuilder;
+
+import java.awt.Image;
+
+import java.awt.datatransfer.Clipboard;
+import java.awt.datatransfer.ClipboardOwner;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.StringSelection;
+import java.awt.datatransfer.Transferable;
+import java.awt.datatransfer.UnsupportedFlavorException;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.Reader;
+import java.io.Serializable;
+import java.io.UnsupportedEncodingException;
+
+import java.util.List;
+import java.util.Iterator;
+
+public class GtkClipboard extends Clipboard
+{
+  /**
+   * The one and only gtk+ clipboard instance for the CLIPBOARD selection.
+   */
+  final static GtkClipboard clipboard = new GtkClipboard("System Clipboard");
+
+  /**
+   * The one and only gtk+ clipboard instance for the PRIMARY selection.
+   */
+  final static GtkClipboard selection = new GtkClipboard("System Selection");
+
+  // Given to the native side so it can signal special targets that
+  // can be converted to one of the special predefined DataFlavors.
+  static final String stringMimeType
+    = DataFlavor.stringFlavor.getMimeType();
+  static final String imageMimeType
+    = DataFlavor.imageFlavor.getMimeType();
+  static final String filesMimeType
+    = DataFlavor.javaFileListFlavor.getMimeType();
+
+  // Indicates whether the results of the clipboard selection can be
+  // cached by GtkSelection. True if
+  // gdk_display_supports_selection_notification.
+  static final boolean canCache = initNativeState(clipboard, selection,
+                                                  stringMimeType,
+                                                  imageMimeType,
+                                                  filesMimeType);
+
+  /**
+   * Creates the clipboard and sets the initial contents to the
+   * current gtk+ selection.
+   */
+  private GtkClipboard(String name)
+  {
+    super(name);
+    setContents(new GtkSelection(this), null);
+  }
+
+  /**
+   * Returns the one and only GtkClipboard instance for the CLIPBOARD
+   * selection.
+   */
+  static GtkClipboard getClipboardInstance()
+  {
+    return clipboard;
+  }
+
+  /**
+   * Returns the one and only GtkClipboard instance for the PRIMARY
+   * selection.
+   */
+  static GtkClipboard getSelectionInstance()
+  {
+    return selection;
+  }
+
+  /**
+   * Sets the GtkSelection facade as new contents of the clipboard.
+   * Called from gtk+ when another application grabs the clipboard and
+   * we loose ownership.
+   *
+   * @param cleared If true this is a clear event (someone takes the
+   * clipboard from us) otherwise it is an owner changed event.
+   */
+  private synchronized void setSystemContents(boolean cleared)
+  {
+    // We need to notify clipboard owner listeners when we were the
+    // owner (the selection was explictly set) and someone takes the
+    // clipboard away from us and asks us the clear any held storage,
+    // or if we weren't the owner of the clipboard to begin with, but
+    // the clipboard contents changed. We could refine this and check
+    // whether the actual available formats did in fact change, but we
+    // assume listeners will check for that anyway (and if possible we
+    // ask to cache the available formats so even if multiple
+    // listeners check after a notification the overhead should be
+    // minimal).
+    boolean owner = ! (contents instanceof GtkSelection);
+    boolean needNotification = (cleared && owner) || (! cleared && ! owner);
+    if (needNotification)
+      GtkClipboardNotifier.announce(this);
+  }
+
+  /**
+   * Sets the new contents and advertises the available flavors to the
+   * gtk+ clipboard.
+   */
+  public synchronized void setContents(Transferable contents,
+                                       ClipboardOwner owner)
+  {
+    super.setContents(contents, owner);
+
+    if (contents == null)
+      {
+        advertiseContent(null, false, false, false);
+        return;
+      }
+
+    // We don't need to do anything for a GtkSelection facade.
+    if (contents instanceof GtkSelection)
+      return;
+
+    boolean text = false;
+    boolean images = false;
+    boolean files = false;
+
+    if (contents instanceof StringSelection
+        || contents.isDataFlavorSupported(DataFlavor.stringFlavor)
+        || contents.isDataFlavorSupported(DataFlavor.plainTextFlavor)
+        || contents.isDataFlavorSupported(DataFlavor.getTextPlainUnicodeFlavor()))
+      text = true;
+
+    DataFlavor[] flavors = contents.getTransferDataFlavors();
+    String[] mimeTargets = new String[flavors.length];
+    for (int i = 0; i < flavors.length; i++)
+      {
+        DataFlavor flavor = flavors[i];
+        String mimeType = flavor.getMimeType();
+        mimeTargets[i] = mimeType;
+
+        if (! text)
+          if ("text".equals(flavor.getPrimaryType())
+              || flavor.isRepresentationClassReader())
+            text = true;
+
+        if (! images && flavors[i].equals(DataFlavor.imageFlavor))
+          {
+            try
+              {
+                Object o = contents.getTransferData(DataFlavor.imageFlavor);
+                if (o instanceof Image)
+                  images = true;
+              }
+            catch (UnsupportedFlavorException ufe)
+              {
+              }
+            catch (IOException ioe)
+              {
+              }
+            catch (ClassCastException cce)
+              {
+              }
+          }
+
+        if (flavors[i].equals(DataFlavor.javaFileListFlavor))
+          files = true;
+      }
+
+    advertiseContent(mimeTargets, text, images, files);
+  }
+
+  /**
+   * Advertises new contents to the gtk+ clipboard given a string
+   * array of (mime-type) targets. When the boolean flags text, images
+   * and/or files are set then gtk+ is asked to also advertise the
+   * availability of any text, image or uri/file content types it
+   * supports. If targets is null (and all flags false) then the
+   * selection has explicitly been erased.
+   */
+  private native void advertiseContent(String[] targets,
+                                       boolean text,
+                                       boolean images,
+                                       boolean files);
+
+  /**
+   * Called by the gtk+ clipboard when an application has requested
+   * text.  Return a string representing the current clipboard
+   * contents or null when no text can be provided.
+   */
+  private String provideText()
+  {
+    Transferable contents = this.contents;
+    if (contents == null || contents instanceof GtkSelection)
+      return null;
+
+    // Handle StringSelection special since that is just pure text.
+    if (contents instanceof StringSelection)
+      {
+        try
+          {
+            return (String) contents.getTransferData(DataFlavor.stringFlavor);
+          }
+        catch (UnsupportedFlavorException ufe)
+          {
+          }
+        catch (IOException ioe)
+          {
+          }
+        catch (ClassCastException cce)
+          {
+          }
+      }
+
+    // Try to get a plain text reader for the current contents and
+    // turn the result into a string.
+    try
+      {
+        DataFlavor plainText = DataFlavor.getTextPlainUnicodeFlavor();
+        Reader r = plainText.getReaderForText(contents);
+        if (r != null)
+          {
+            CPStringBuilder sb = new CPStringBuilder();
+            char[] cs = new char[1024];
+            int l = r.read(cs);
+            while (l != -1)
+              {
+                sb.append(cs, 0, l);
+                l = r.read(cs);
+              }
+            return sb.toString();
+          }
+      }
+    catch (IllegalArgumentException iae)
+      {
+      }
+    catch (UnsupportedEncodingException iee)
+      {
+      }
+    catch (UnsupportedFlavorException ufe)
+      {
+      }
+    catch (IOException ioe)
+      {
+      }
+
+    return null;
+  }
+
+  /**
+   * Called by the gtk+ clipboard when an application has requested an
+   * image.  Returns a GtkImage representing the current clipboard
+   * contents or null when no image can be provided.
+   */
+  private GtkImage provideImage()
+  {
+    Transferable contents = this.contents;
+    if (contents == null || contents instanceof GtkSelection)
+      return null;
+
+    try
+      {
+        Object o = contents.getTransferData(DataFlavor.imageFlavor);
+        if( o instanceof GtkImage )
+          return (GtkImage) o;
+        else
+          return new GtkImage(((Image)o).getSource());
+      }
+    catch (UnsupportedFlavorException ufe)
+      {
+      }
+    catch (IOException ioe)
+      {
+      }
+    catch (ClassCastException cce)
+      {
+      }
+
+    return null;
+  }
+
+  /**
+   * Called by the gtk+ clipboard when an application has requested a
+   * uri-list.  Return a string array containing the URIs representing
+   * the current clipboard contents or null when no URIs can be
+   * provided.
+   */
+  private String[] provideURIs()
+  {
+    Transferable contents = this.contents;
+    if (contents == null || contents instanceof GtkSelection)
+      return null;
+
+    try
+      {
+        List list = (List) contents.getTransferData(DataFlavor.javaFileListFlavor);
+        String[] uris = new String[list.size()];
+        int u = 0;
+        Iterator it = list.iterator();
+        while (it.hasNext())
+          uris[u++] = ((File) it.next()).toURI().toString();
+        return uris;
+      }
+    catch (UnsupportedFlavorException ufe)
+      {
+      }
+    catch (IOException ioe)
+      {
+      }
+    catch (ClassCastException cce)
+      {
+      }
+
+    return null;
+  }
+
+  /**
+   * Called by gtk+ clipboard when an application requests the given
+   * target mime-type. Returns a byte array containing the requested
+   * data, or null when the contents cannot be provided in the
+   * requested target mime-type. Only called after any explicit text,
+   * image or file/uri requests have been handled earlier and failed.
+   */
+  private byte[] provideContent(String target)
+  {
+    // Sanity check. The callback could be triggered just after we
+    // changed the clipboard.
+    Transferable contents = this.contents;
+    if (contents == null || contents instanceof GtkSelection)
+      return null;
+
+    // XXX - We are being called from a gtk+ callback. Which means we
+    // should return as soon as possible and not call arbitrary code
+    // that could deadlock or go bonkers. But we don't really know
+    // what DataTransfer contents object we are dealing with. Same for
+    // the other provideXXX() methods.
+    try
+      {
+        DataFlavor flavor = new DataFlavor(target);
+        Object o = contents.getTransferData(flavor);
+
+        if (o instanceof byte[])
+          return (byte[]) o;
+
+        if (o instanceof InputStream)
+          {
+            InputStream is = (InputStream) o;
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            byte[] bs = new byte[1024];
+            int l = is.read(bs);
+            while (l != -1)
+              {
+                baos.write(bs, 0, l);
+                l = is.read(bs);
+              }
+            return baos.toByteArray();
+          }
+
+        if (o instanceof Serializable)
+          {
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            ObjectOutputStream oos = new ObjectOutputStream(baos);
+            oos.writeObject(o);
+            oos.close();
+            return baos.toByteArray();
+          }
+      }
+    catch (ClassNotFoundException cnfe)
+      {
+      }
+    catch (UnsupportedFlavorException ufe)
+      {
+      }
+    catch (IOException ioe)
+      {
+      }
+    catch (ClassCastException cce)
+      {
+      }
+
+    return null;
+  }
+
+  /**
+   * Initializes the gtk+ clipboards and caches any native side
+   * structures needed. Returns whether or not the contents of the
+   * Clipboard can be cached (gdk_display_supports_selection_notification).
+   */
+  private static native boolean initNativeState(GtkClipboard clipboard,
+                                                GtkClipboard selection,
+                                                String stringTarget,
+                                                String imageTarget,
+                                                String filesTarget);
+}