206                                           Object attachment)

   206                                           Object attachment)

   207     {

   207     {

   208         if (!(ch instanceof SelChImpl))

   208         if (!(ch instanceof SelChImpl))

   209             throw new IllegalSelectorException();

   209             throw new IllegalSelectorException();

   210         SelectionKeyImpl k = new SelectionKeyImpl((SelChImpl)ch, this);

   210         SelectionKeyImpl k = new SelectionKeyImpl((SelChImpl)ch, this);

   212 

   213 

   213         // register (if needed) before adding to key set

   214         // register (if needed) before adding to key set

   214         implRegister(k);

   215         implRegister(k);

   215 

   216 

   216         // add to the selector's key set, removing it immediately if the selector

   217         // add to the selector's key set, removing it immediately if the selector