Mapstrukt

This project aims to improve the support of Mapstruct to Kotlin. This is a simple code generator that works beside the Mapstruct code generation, in order to add some extension functions to entities converted using Mapstruct.

So, you can use the converter method you definied, already on the source entity:

val person = Person("Samuel", "Jackson", "0123 334466", LocalDate.of(1948, 12, 21))
val personDto = person.convertToDto

instead of:

val person = Person("Samuel", "Jackson", "0123 334466", LocalDate.of(1948, 12, 21))
val converter = Mappers.getMapper(PersonConverter::class.java)
val personDto = converter.convertToDto(person)

Under the hood what the generator does is to generate a Kotlin Object with some extension function, for instance, in the example above the generator creates:

package com.github.jesty

import org.mapstruct.example.kotlin.dto.PersonDto
import org.mapstruct.example.kotlin.model.Person

object Mapstrukt {
    fun org.mapstruct.example.kotlin.model.Person.convertToDto(): PersonDto = org.mapstruct.factory.Mappers.getMapper(org.mapstruct.example.kotlin.converter.PersonConverter::class.java).convertToDto(this)

}

The example project in mapstrukt-example folder is copied from https://github.com/mapstruct/mapstruct-examples/tree/master/mapstruct-kotlin-gradle.

Code generator setup

The generator isn’t available in any Maven repository, so you need to install it locally running in mapstrukt folder:

./gradlew build

After you can configure your plugin as shown below:

build.gradle.kts

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    kotlin("jvm") version "1.2.71"
    kotlin("kapt") version "1.2.71"
}

group = "org.mapstruct.examples"
version = "1.0.0-SNAPSHOT"
repositories {
    mavenLocal()
    mavenCentral()
}

dependencies {
    compile(kotlin("stdlib-jdk8"))
    compile("org.mapstruct:mapstruct:1.3.0.Final")
    kapt("org.mapstruct:mapstruct-processor:1.3.0.Final")
    kapt("com.github.jesty:mapstrukt:1.0.0-SNAPSHOT")

    testCompile("org.junit.jupiter:junit-jupiter-api:5.3.1")
    testCompile("org.junit.jupiter:junit-jupiter-engine:5.3.1")
    testCompile("org.assertj:assertj-core:3.11.1")
}

tasks.withType<KotlinCompile> {
    kotlinOptions.jvmTarget = "1.8"
}

val test by tasks.getting(Test::class) {
    useJUnitPlatform { }
}