Konvert

Konvert is like Mapstruct for Kotlin. It is a kotlin compiler plugin using KSP API to generate kotlin code to map one class to another. It is open-source and available on GitHub.

There are three different ways to use Konvert:

1. Using @KonvertTo on source class:

   @KonvertTo(PersonDto::class)
   class Person(val firstName: String, val lastName: String)
   class PersonDto(val firstName: String, val lastName: String)
   

   This will generate the following extension function

   fun Person.toPersonDto(): PersonDto =
      PersonDto(firstName = firstName, lastName = lastName)
   

2. Using @KonvertFrom on target class (especially useful, if you cannot change the code of the source class)

   class Person(val firstName: String, val lastName: String) {
      @KonvertFrom(PersonDto::class)
      companion object
   }
   class PersonDto(val firstName: String, val lastName: String)
   

   This will generate the following extension function

   fun Person.Companion.fromPersonDto(personDto: PersonDto): Person =
     Person(firstName = personDto.firstName, lastName = personDto.lastName)
   

3. Using @Konverter on interfaces:

   class Person(val firstName: String, val lastName: String)
   class PersonDto(val firstName: String, val lastName: String)
      
   @Konverter
   interface PersonMapper {
     fun toDto(person: Person): PersonDto
   }
   

   This will generate the following object

   object PersonMapperImpl: PersonMapper {
     override fun toDto(person: Person): PersonDto
       = PersonDto(firstName = person.firstName, lastName = person.lastName)
   }
   

More information

See the documentation: https://mcarleio.github.io/konvert/