MapStruct QualifiedByName with multiple parameters

Currently MapStruct does not support mapping methods with multiple source properties.

However, in your case you can use the @Context from 1.2.0. From what I understand the projId and the code are there just as helper of the mapping, and they are not used to map target properties from.

So you can do something like (It should work in theory):

@Mapper
public interface OneMapper {

    @Mapping(target="id", source="one.id")
    @Mapping(target="qualified", qualifiedByName="checkQualifiedNamed")
    OneDto createOne (One one, @Context Integer projId, @Context String code);

    @Named("checkQualifiedNamed")
    default Boolean checkQualified (One one, @Context Integer projId, @Context String code) {
        if(one.getProjectId() == projId && one.getCode().equalsIgnoreCase(code)) {
            return Boolean.TRUE;
        }
        return Boolean.FALSE;                   
    }
}

Another alternative would be to extract all those properties into a separate class and pass that along (this would allow for multiple parameters of the same type).

The class would look like:

public class Filter {

    private final Integer projId;
    private final Integer val;
    private final String code;

    public Filter (Integer projId, Integer val, String code) {
        this.projId = projId;
        this.val = val;
        this.code = code;
    }

    //getters
}

Your mapper will then look like:

@Mapper
public interface OneMapper {

    @Mapping(target="id", source="one.id")
    @Mapping(target="qualified", qualifiedByName="checkQualifiedNamed")
    OneDto createOne (One one, @Context Filter filter);

    @Named("checkQualifiedNamed")
    default Boolean checkQualified (One one, @Context Filter filter) {
        if(one.getProjectId() == filter.getProjId() && one.getVal() == filter.getVal() && one.getCode().equalsIgnoreCase(filter.getCode())) {
            return Boolean.TRUE;
        }
        return Boolean.FALSE;                   
    }
}

You can then call the mapper like: mapper.createOne(one, new Filter(projId, val, code));