code: public void setExtends(String superType) {
  		if (!Strings.isEmpty(superType)) {
  			JvmParameterizedTypeReference superTypeRef = newTypeRef(this.container, superType);
  			this.sarlClass.setExtends(superTypeRef);
  			return;
  		}
  		this.sarlClass.setExtends(null);
  	}
docs: Change the super type.
  @param superType the qualified name of the super type,
  or <code>null</code> if the default type.