PropertyAcess : Define condition values for label in PropertyAcess

I have a model called Field which has id and label.

I have defined PropertyAcess as below and it works. I would like to change it in such a way that I can show label based on condition ie if field.getLabel() is null, use field.getId() as label else use field.getLabel() as label. How can I acheieve that

interface FieldProperties extends PropertyAccess<Field> {    ModelKeyProvider<Field> id();      LabelProvider<Field> label();      @Path("label")    ValueProvider<Field, String> labelProp();   }  

Thanks

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