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/*
* Copyright (c) 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.ui.transfer;
import org.eclipse.emf.cdo.eresource.CDOResourceNode;
import org.eclipse.emf.cdo.view.CDOView;
import org.eclipse.emf.cdo.view.CDOViewRegistry;
import org.eclipse.net4j.util.io.ExtendedDataOutputStream;
import org.eclipse.net4j.util.io.IORuntimeException;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.ui.part.PluginTransfer;
import org.eclipse.ui.part.PluginTransferData;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Iterator;
/**
* @author Eike Stepper
*/
public class RepositoryTransferDragListener extends DragSourceAdapter
{
private static final Transfer[] TRANSFERS = { PluginTransfer.getInstance(), FileTransfer.getInstance() };
private StructuredViewer viewer;
protected RepositoryTransferDragListener(StructuredViewer viewer)
{
this.viewer = viewer;
}
@Override
public void dragStart(DragSourceEvent event)
{
IStructuredSelection selection = (IStructuredSelection)viewer.getSelection();
event.doit = !selection.isEmpty(); // TODO Check that only resource nodes are selected?
}
@Override
public void dragSetData(DragSourceEvent event)
{
IStructuredSelection selection = (IStructuredSelection)viewer.getSelection();
for (Transfer transfer : TRANSFERS)
{
if (transfer.isSupportedType(event.dataType))
{
event.data = getObject(selection, transfer);
break;
}
}
}
protected Object getObject(IStructuredSelection selection, Transfer transfer)
{
try
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
@SuppressWarnings("resource")
ExtendedDataOutputStream out = new ExtendedDataOutputStream(baos);
CDOView view = null;
for (Iterator<?> it = selection.iterator(); it.hasNext();)
{
Object object = it.next();
if (object instanceof CDOResourceNode)
{
CDOResourceNode node = (CDOResourceNode)object;
CDOView nodeView = node.cdoView();
if (view == null)
{
view = nodeView;
int viewID = CDOViewRegistry.INSTANCE.getID(view);
out.writeInt(viewID);
}
else if (view != nodeView)
{
continue;
}
out.writeString(node.getPath());
}
}
out.writeString(null);
byte[] data = baos.toByteArray();
return new PluginTransferData(RepositoryPluginDropAdapter.DROP_ACTION_ID, data);
}
catch (IOException ex)
{
throw new IORuntimeException(ex);
}
}
public static RepositoryTransferDragListener support(StructuredViewer viewer)
{
RepositoryTransferDragListener dragListener = new RepositoryTransferDragListener(viewer);
viewer.addDragSupport(DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_DEFAULT, TRANSFERS, dragListener);
return dragListener;
}
}
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