Bug 126658 [CommonNavigator] [DND] Complete definition of DND API
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonDropAdapterAssistant.java
* @return True if the operation completed.
	 */
	public abstract boolean handleDrop(DropTargetEvent aDropTargetEvent,
			Object aTarget);
	/**
	 * When a drop opportunity presents itself, the available TransferData types
	 * will be supplied in the event. The DropAdapter must select one of these
	 * TransferData types for the DragAdapter to provide. By default the Common
	 * Navigator supports {@link LocalSelectionTransfer} and
	 * {@link PluginTransfer}. Clients are required to indicate if they support
	 * other TransferData types using this method.
	 * 
	 * <p>
	 * If none of the given TransferData types are supported, return null.
	 * </p>
	 * 
	 * @param theAvailableTransferData
	 * @return The supported TransferData from the set.
	 */
	public abstract TransferData findSupportedTransferData(
			TransferData[] theAvailableTransferData);
	/**
	 * 
	 * @return The associated content service.
	 */
	protected INavigatorContentService getContentService() {
		return contentService;
	}
}