public class IDiagramElementEditPartAdapterFactory implements IAdapterFactory {

  @SuppressWarnings("unchecked")
  @Override
  public <T> T getAdapter(Object adaptableObject, Class<T> adapterType) {
    if (adapterType == MyDomainElement.class) {
      Object model = ((IDiagramElementEditPart) adaptableObject).getModel();
      if (model instanceof View) {
        Object element = ((View)model).getElement();
        if (element instanceof DSemanticDecorator && adapterType.isInstance(((DSemanticDecorator)element).getTarget())) {
          return (T) ((DSemanticDecorator)element).getTarget();
        }
      }
    }
    return null;
  }

  @Override
  public Class<?>[] getAdapterList() {
    return new Class[] {
        MyDomainElement.class
    };
  }

}