Bug 5699 Add ResourceTransfer to packages view
The packages view should add the ResoruceTransfer as a drag source to its list of transfers
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/SelectionTransferDropAdapter.java
private List fElements;
	private MoveRefactoring fMoveRefactoring;
	private int fCanMoveElements;
	private CopyRefactoring fCopyRefactoring;
	private int fCanCopyElements;
	public SelectionTransferDropAdapter(AbstractTreeViewer viewer) {
		super(viewer, SWT.NONE);
	}
	
	
	public Transfer getTransfer() {
		return LocalSelectionTransfer.getInstance();
	}
	
	
	public void dragEnter(DropTargetEvent event) {
		clear();
		super.dragEnter(event);
	}
	
	public void dragLeave(DropTargetEvent event) {
		clear();
		super.dragLeave(event);
	}
	
	private void clear() {
		fElements= null;
		fMoveRefactoring= null;
		fCanMoveElements= 0;