001/* DropTargetContext.java --
002   Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038package java.awt.dnd;
039
040import java.awt.Component;
041import java.awt.datatransfer.DataFlavor;
042import java.awt.datatransfer.Transferable;
043import java.awt.datatransfer.UnsupportedFlavorException;
044import java.awt.dnd.peer.DropTargetContextPeer;
045import java.io.IOException;
046import java.io.Serializable;
047import java.util.Arrays;
048import java.util.List;
049
050/**
051 * @author Michael Koch (konqueror@gmx.de)
052 * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
053 * @since 1.2
054 */
055public class DropTargetContext implements Serializable
056{
057  static final long serialVersionUID = -634158968993743371L;
058
059  protected class TransferableProxy implements Transferable
060  {
061    protected boolean isLocal;
062    protected Transferable transferable;
063
064    TransferableProxy(Transferable t, boolean local)
065    {
066      this.transferable = t;
067      this.isLocal = local;
068    }
069    
070    public DataFlavor[] getTransferDataFlavors()
071    {
072      return transferable.getTransferDataFlavors();
073    }
074
075    public boolean isDataFlavorSupported(DataFlavor flavor)
076    {
077      return transferable.isDataFlavorSupported(flavor);
078    }
079
080    public Object getTransferData(DataFlavor flavor)
081      throws UnsupportedFlavorException, IOException
082    {
083      return transferable.getTransferData (flavor);
084    }
085  }
086
087  private DropTarget dropTarget;
088  private int targetActions;
089  private DropTargetContextPeer dtcp;
090
091  // package private
092  DropTargetContext(DropTarget dropTarget)
093  {
094    this.dropTarget = dropTarget;
095  }
096
097  public DropTarget getDropTarget()
098  {
099    return dropTarget;
100  }
101
102  public Component getComponent()
103  {
104    return dropTarget.getComponent();
105  }
106
107  public void addNotify(DropTargetContextPeer dtcp)
108  {
109    this.dtcp = dtcp;
110  }
111
112  public void removeNotify()
113  {
114    this.dtcp = null;
115  }
116
117  protected void setTargetActions(int actions)
118  {
119    targetActions = actions;
120  }
121
122  protected int getTargetActions()
123  {
124    return targetActions;
125  }
126
127  /**
128   * Signals that the drop is completed.
129   *
130   * @exception InvalidDnDOperationException If a drop is not outstanding.
131   */
132  public void dropComplete (boolean success)
133  {
134    if (dtcp != null)
135      dtcp.dropComplete(success);
136  }
137
138  protected void acceptDrag (int dragOperation)
139  {
140    if (dtcp != null)
141      dtcp.acceptDrag(dragOperation);
142  }
143
144  protected void rejectDrag ()
145  {
146    if (dtcp != null)
147      dtcp.rejectDrag();
148  }
149
150  protected void acceptDrop (int dropOperation)
151  {
152    if (dtcp != null)
153      dtcp.acceptDrop(dropOperation);
154  }
155
156  protected void rejectDrop ()
157  {
158    if (dtcp != null)
159      dtcp.rejectDrop();    
160  }
161
162  protected DataFlavor[] getCurrentDataFlavors ()
163  {
164    if (dtcp != null)
165      dtcp.getTransferDataFlavors();
166    return null;
167  }
168
169  protected List<DataFlavor> getCurrentDataFlavorsAsList ()
170  {
171    return Arrays.asList(getCurrentDataFlavors ());
172  }
173
174  protected boolean isDataFlavorSupported (DataFlavor flavor)
175  {
176    return getCurrentDataFlavorsAsList().contains (flavor);
177  }
178
179  /**
180   * Return the <code>Transferable</code> operandof this operation.
181   *
182   * @exception InvalidDnDOperationException If a drag is not outstanding.
183   */
184  protected Transferable getTransferable() 
185    throws InvalidDnDOperationException
186  {
187    // FIXME: Implement this
188    if (dtcp != null)
189      return dtcp.getTransferable();
190    return null;
191  }
192
193  protected Transferable createTransferableProxy(Transferable t, boolean local)
194  {
195    return new TransferableProxy(t, local);
196  }
197} // class DropTargetContext