Kotlin reflect package and get all classes

Question

How it is possible to reflect a package and list all classes as KClass<*>?

fun listAllClassesInPackage(pack: String): List<KClass<*>> = ...
fun main(args: Array<String>) {
    val classes: List<KClass<*>> = listAllClassesInPackage("com.example")
    classes.forEach { k ->
        println(k)
    }
}

This might help: https://stackoverflow.com/questions/520328/can-you-find-all-classes-in-a-package-using-reflection — Tenfour04, Jan 27 '20 at 18:58
@Tenfour04 Not really because is just for java classes. I want the class description as KClass object. — Jayser, Jan 27 '20 at 19:50
You can convert a Java Class to a KClass. `myJavaClass.kotlin` — Tenfour04, Jan 27 '20 at 19:53

score 2 · Answer 1 · answered Jan 28 '20 at 18:38

Here's my solution.

package com.example

import org.reflections.Reflections
import org.reflections.scanners.ResourcesScanner
import org.reflections.scanners.SubTypesScanner
import org.reflections.util.ClasspathHelper
import org.reflections.util.ConfigurationBuilder
import org.reflections.util.FilterBuilder

class Test1

fun op1() = ""

fun main(args: Array<String>) {
    val packagePath = "com.example"
    val reflections =
        Reflections(
            ConfigurationBuilder()
                .filterInputsBy(FilterBuilder().includePackage(packagePath))
                .setUrls(ClasspathHelper.forPackage(packagePath))
                .setScanners(SubTypesScanner(false))
        )
    val typeList = reflections.getSubTypesOf(Object::class.java)
    typeList.forEach { c ->
        println(c.kotlin)
    }
}

I got it to work with a specific base class, but Object::class.java doesn't return anything for me — FailedUnitTest, May 19 '22 at 16:52

uglibubla · Answer 2 · 2023-05-11T14:11:15.590

1

You should check out the kotlin reflekt plugin, though it isn't actively maintained anymore there is a working version for up to kotlin 1.7.0.

It allows you to simply call

Reflekt.classes().withSupertype<Any>().toSet().filter {
    it.kClass.java.package.name.startsWith("com.example")
}

edited May 11 '23 at 14:11

answered May 09 '23 at 11:27

uglibubla

83
11

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Kotlin reflect package and get all classes

2 Answers2