| /* Clipboard.java -- Class for transferring data via cut and paste. |
| Copyright (C) 1999, 2001, 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 java.awt.datatransfer; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| /** |
| * This class allows data to be transferred using a cut and paste type |
| * mechanism. |
| * |
| * @author Aaron M. Renn (arenn@urbanophile.com) |
| * @author Mark J. Wielaard (mark@klomp.org) |
| */ |
| public class Clipboard |
| { |
| /** |
| * The data currently on this clipboard. For use by |
| * subclasses. Also returned by the public method getContents(). |
| */ |
| protected Transferable contents; |
| |
| /** |
| * The owner of this clipboard. |
| */ |
| protected ClipboardOwner owner; |
| |
| // The clipboard name |
| private final String name; |
| |
| // The flavor listeners (most likely small). |
| private final ArrayList listeners = new ArrayList(3); |
| |
| /** |
| * Initializes a new instance of <code>Clipboard</code> with the |
| * specified name. |
| * |
| * @param name The clipboard name. |
| */ |
| public Clipboard(String name) |
| { |
| this.name = name; |
| } |
| |
| /** |
| * Returns the name of the clipboard. |
| */ |
| public String getName() |
| { |
| return name; |
| } |
| |
| /** |
| * Returns the contents of the clipboard. |
| * |
| * @param requestor The object requesting the contents. This |
| * implementation ignores this parameter. |
| * |
| * @exception IllegalStateException If the clipboard is currently unavailable |
| */ |
| public synchronized Transferable getContents(Object requestor) |
| { |
| return contents; |
| } |
| |
| /** |
| * Sets the content and owner of this clipboard. If the given owner |
| * is different from the current owner then <code>lostOwnership()</code> |
| * is called on the current owner with the old contents of the given |
| * clipboard. |
| * |
| * @param contents The new clipboard contents. |
| * @param owner The new clipboard owner |
| * |
| * @exception IllegalStateException If the clipboard is currently unavailable |
| */ |
| public synchronized void setContents(Transferable contents, |
| ClipboardOwner owner) |
| { |
| Transferable oldContents = getContents(null); |
| this.contents = contents; |
| if (this.owner != owner) |
| { |
| ClipboardOwner oldOwner = this.owner; |
| this.owner = owner; |
| if (oldOwner != null) |
| oldOwner.lostOwnership(this, oldContents); |
| } |
| |
| FlavorListener[] fs = getFlavorListeners(); |
| if (fs.length > 0) |
| { |
| // We are a bit optimistic here. We assume DataFlavors will be |
| // given in the same order. If the number of flavors is |
| // different or the order of the DataFlavors in the list then |
| // fire a change event. |
| boolean newFlavors = ((contents != null && oldContents == null) |
| || (contents == null && oldContents != null)); |
| if (!newFlavors && contents != null && oldContents != null) |
| { |
| DataFlavor[] df1 = contents.getTransferDataFlavors(); |
| DataFlavor[] df2 = oldContents.getTransferDataFlavors(); |
| newFlavors = df1.length != df2.length; |
| |
| for (int i = 0; !newFlavors && i < df1.length; i++) |
| newFlavors = !df1[i].equals(df2[i]); |
| } |
| |
| if (newFlavors) |
| { |
| FlavorEvent e = new FlavorEvent(this); |
| for (int i = 0; i < fs.length; i++) |
| fs[i].flavorsChanged(e); |
| } |
| } |
| } |
| |
| public DataFlavor[] getAvailableDataFlavors() |
| { |
| Transferable c = getContents(null); |
| if (c == null) |
| return new DataFlavor[0]; |
| else |
| return c.getTransferDataFlavors(); |
| } |
| |
| public boolean isDataFlavorAvailable(DataFlavor flavor) |
| { |
| DataFlavor[] fs = getAvailableDataFlavors(); |
| for (int i = 0; i < fs.length; i++) |
| if (flavor.equals(fs[i])) |
| return true; |
| |
| return false; |
| } |
| |
| public Object getData(DataFlavor flavor) |
| throws UnsupportedFlavorException, IOException |
| { |
| Transferable c = getContents(null); |
| if (c == null) |
| throw new UnsupportedFlavorException(flavor); |
| else |
| return c.getTransferData(flavor); |
| } |
| |
| public void addFlavorListener(FlavorListener listener) |
| { |
| if (listener == null) |
| return; |
| |
| synchronized(listeners) |
| { |
| listeners.add(listener); |
| } |
| } |
| |
| public void removeFlavorListener(FlavorListener listener) |
| { |
| if (listener == null) |
| return; |
| |
| synchronized(listeners) |
| { |
| listeners.remove(listener); |
| } |
| } |
| |
| public FlavorListener[] getFlavorListeners() |
| { |
| synchronized(listeners) |
| { |
| return (FlavorListener[]) |
| listeners.toArray(new FlavorListener[listeners.size()]); |
| } |
| } |
| } |