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
handleDropMove(target, event);
			} else if (event.detail == DND.DROP_COPY) {
				handleDropCopy(target, event);
			}
			
			
			
			
			event.detail= DND.DROP_NONE;
		} catch (JavaModelException e){
			ExceptionHandler.handle(e, "Drag'n'drop", "Unexpected exception. See log for details.");
		}	
	}
	
	private boolean handleValidateMove(Object target, DropTargetEvent event) throws JavaModelException{
		if (fMoveRefactoring == null){
			IDocumentProvider documentProvider= JavaPlugin.getDefault().getCompilationUnitDocumentProvider();
			ITextBufferChangeCreator changeCreator= new DocumentTextBufferChangeCreator(documentProvider);
			fMoveRefactoring= new MoveRefactoring(fElements, changeCreator);
		}	
		
		if (!canMoveElements())
			return false;	
		
		return fMoveRefactoring.isValidDestination(target);
	}
	
	private boolean canMoveElements() {
		if (fCanMoveElements == 0) {
			fCanMoveElements= 2;