@Override
public void doHandle(final PerformContext performContext) throws ScenarioBoundValueException {
final ObjectAdapter onAdapter = performContext.getOnAdapter();
final ObjectMember nakedObjectMember = performContext.getObjectMember();
final CellBinding onMemberBinding = performContext.getPeer().getOnMemberBinding();
final OneToManyAssociation otma = (OneToManyAssociation) nakedObjectMember;
final CollectionAddToFacet addToFacet = nakedObjectMember.getFacet(CollectionAddToFacet.class);
if (addToFacet == null) {
throw ScenarioBoundValueException.current(onMemberBinding, "(cannot add to collection)");
}
// safe since guaranteed by superclass
final CellBinding arg0Binding = performContext.getPeer().getArg0Binding();
final ScenarioCell arg0Cell = arg0Binding.getCurrentCell();
final String toAddAlias = arg0Cell.getText();
final ObjectAdapter toAddAdapter = performContext.getPeer().getAliasRegistry().getAliased(toAddAlias);
if (toAddAdapter == null) {
throw ScenarioBoundValueException.current(arg0Binding, "(unknown alias)");