Provide an API to set TypeVariableName bounds lazily

[yigit]

Currently, there is no way to set bounds of a TypeVariableName after it is constructed (which makes sense as they are designed to be immutable).

Unfortunately, creating TypeName for self referencing types becomes impossible without it (class SelfReferencing<T : SelfReferencing<T>>)

JavaPoet solves this problem internally by using a private constructor: https://github.com/square/javapoet/blame/master/src/main/java/com/squareup/javapoet/TypeVariableName.java#L108

Would it be possible to open up a builder that receives a List (and keeps it as is) so we can implement the same workaround for KSP ?

For reference, here is the WIP CL in Room where we are trying to workaround this issue. Unfortunately, the only solution we have is reflection which does not feel great.

[tbroyer]

You can use a TypeVariableName.get(name) to reference the "outer" type variable, it doesn't have to represent the recursion.

$ jshell --class-path ~/.m2/repository/com/squareup/javapoet/1.13.0/javapoet-1.13.0.jar
|  Welcome to JShell -- Version 11.0.11
|  For an introduction type: /help intro

jshell> import com.squareup.javapoet.*;

jshell> JavaFile.builder("pkg",
   ...>   TypeSpec.classBuilder("Cls")
   ...>    .addTypeVariable(TypeVariableName.get("T", ParameterizedTypeName.get(ClassName.get("pkg", "Cls"), TypeVariableName.get("T"))))
   ...>    .build()).build()
$2 ==> package pkg;

class Cls<T extends Cls<T>> {
}

jshell> 

[yigit]

Thanks for the tip.

Unfortunately, this happens at a lower layer. We have some wrapper around KSP - KSType (kotlin symbol processing) and JavaAP-TypeMirror both of which provide an API to get a typeName. I'm trying to make sure they return the exactly same TypeName for the same type.