abstract public class AnInterfacePOA implements AnInterfaceOperations
{
  public AnInterface _this () { ... }
  ...
}

public class AnInterfacePOATie extends AnInterfacePOA
{
  private AnInterfaceOperations _delegate;

  public AnInterfacePOATie (AnInterfaceOperations delegate)
  { _delegate = delegate; }

  public AnInterfaceOperations _delegate ()
  { return (_delegate); }

  public void _delegate (AnInterfaceOperations delegate)
  { _delegate = delegate; }

  public ... AnOperation (...) { return (_delegate.AnOperation (...); }
}