/**
* Cancels the command, undoing the effects of any {@link #preview()} calls. For this method to do
* anything, the command must implement the {@link Previewable} interface.
*/
@Override
public void cancel() {
if (!(command instanceof Previewable)) return; // nothing to cancel
final Previewable previewPlugin = (Previewable) command;
previewPlugin.cancel();
}
/**
* Computes a preview of the command's results. For this method to do anything, the command must
* implement the {@link Previewable} interface.
*/
@Override
public void preview() {
if (!(command instanceof Previewable)) return; // cannot preview
final Previewable previewPlugin = (Previewable) command;
previewPlugin.preview();
}