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Diffstat (limited to 'libjava/classpath/java/awt/datatransfer/Clipboard.java')
-rw-r--r-- | libjava/classpath/java/awt/datatransfer/Clipboard.java | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/datatransfer/Clipboard.java b/libjava/classpath/java/awt/datatransfer/Clipboard.java new file mode 100644 index 000000000..d0a1d3a3f --- /dev/null +++ b/libjava/classpath/java/awt/datatransfer/Clipboard.java @@ -0,0 +1,213 @@ +/* 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()]); + } + } +} |