Warning Work in progress.
Kotlin FIR+IR plugin for generating a class builder.
import com.bnorm.piecemeal.Piecemeal
@Piecemeal
class Person(
val name: String,
val nickname: String? = name,
val age: Int = 0,
)The above example will generate the following
@Piecemeal
class Person private constructor(
val name: String,
val nickname: String? = name,
val age: Int = 0,
) {
fun newBuilder(): Builder {
val builder = Builder()
builder.name = name
builder.nickname = nickname
builder.age = age
return builder
}
class Builder {
@set:JvmSynthetic // Hide 'void' setter from Java.
var name: String? = null
@set:JvmSynthetic // Hide 'void' setter from Java.
var nickname: String? = null
@set:JvmSynthetic // Hide 'void' setter from Java.
var age: Int? = null
fun setName(name: String?): Builder {
this.name = name
return this
}
fun setNickname(nickname: String?): Builder {
this.nickname = nickname
return this
}
fun setAge(age: Int): Builder {
this.age = age
return this
}
fun build(): Person {
val name = name ?: throw IllegalStateException("Missing required parameter 'name'.")
val nickname = nickname ?: name
val age = age ?: 0
return Person(
name = name,
nickname = nickname ?: name,
age = age,
)
}
}
}
@JvmSynthetic // Hide from Java callers who should use Builder.
fun Person(builder: Person.Builder.() -> Unit): Person {
return Person.Builder().apply(builder).build()
}