CODEWITHSUNDEEP
javamapstruct
vcmkrtchyan
vcmkrtchyan

Reputation: 2626

How to do parameterized mapping using MapStruct in Java?

I have following entity class

public class Company {

    private Map<Locale, String> name;

    /* Other fields, getters, setters */
}

And the following DTO class

public class CompanyHeader {

    private String name;

    /* Other fields, getters, setters */
}

So, my entity contains names for different languages, and I want to map it for a given Locale

Here's my mapper class

@Mapper
public interface CompanyMapper {

    CompanyHeader entityToHeader(Company company, Locale locale);

    @Named("getByLocale")
    default String getValueByLocale(Map<Locale, String> map, Locale locale) {
        return map.get(locale);
    }
}

And now my question is, how should I annotate my mapping method so that it understands company as my source object, getValueByLocale method as a mapping method for name field, and locale as a parameter for getValueByLocale method?

Here's how I use my mapping method from outside

public Page<CompanyHeader> getCompanies(CompanyFilter companyFilter, Locale locale) {
    Page<Company> companies = getCompanies(companyFilter);
    Page<CompanyHeader> headers = companies.map(company -> companyMapper.entityToHeader(company, locale));

    return headers;
}

Upvotes: 2

Views: 1851

Answers (1)

Filip
Filip

Reputation: 21471

What you are trying to solve seems like a good usage for @Context.

If you define your mapper like

@Mapper
public interface CompanyMapper {

    CompanyHeader entityToHeader(Company company, @Coontext Locale locale);

    default String getValueByLocale(Map<Locale, String> map, @Context Locale locale) {
        return map.get(locale);
    }
}

By using @Context you are telling MapStrut that this object should not be seen as a mapping object and that it can be passed to other objects. With this method you are going to be able to map all Map<Locale, String> properties into a String.

You can read more about @Context in the Passing context or state objects to custom methods

Upvotes: 1

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