How to reach destination object in ModelMapper's AbstractConverter.convert() method

Question

I would like to map fields from source into the existing object dest via custom Converter. Could you please suggest a canonical way to reach out dest object from AbstractConverter#convert()

Please find the code below:

Source source = new Source(xxx);
Dest dest = new Dest(yyy);

modelMapper.addConverter(new AbstractConverter<Source, Dest>() {
  @Override
  protected Dest convert(Source source) {
      // here I need to access 'dest' object in order to manually map fields from 'source'
  });

modelMapper.map(source, dest);

Answer 1

If you want to access the destination object you should not use AbstractConverter, but an anonymous Converter:

modelMapper.addConverter(new Converter<Source, Dest>() {
    public Dest convert(MappingContext<Source, Dest> context) {
         Source s = context.getSource();
         Dest d = context.getDestination();
         d.setYyy(s.getXxx() + d.getYyy()); // example of using dest's existing field
         return d;
     }
});