Kotlin - generate toString() for a non-data class

Question

Situation:

I have a class with lateinit fields, so they are not present in the constructor:

class ConfirmRequest() {
           


        

Answer 1

This is what I endup doing.

Create extension function on Any class

fun Any.toStringByReflection(exclude: List = listOf(), mask: List = listOf()): String {
    val propsString = this::class.memberProperties
            .filter { exclude.isEmpty() || !exclude.contains(it.name) }
            .joinToString(", ") {
                val value = if (!mask.isEmpty() && mask.contains(it.name)) "****" else it.getter.call(this).toString()
                "${it.name}=${value}"
            };

    return "${this::class.simpleName} [${propsString}]"
}

Then you can call this method from individual type.

override fun toString(): String {
    return this.toStringByReflection()
}

It generates string below

Table [colums=[], name=pg_aggregate_fnoid_index, schema=pg_catalog, type=SYSTEM INDEX]

With name field masked:

override fun toString(): String {
    return this.toStringByReflection(mask= listOf("name"))
}

It generates,

Table [colums=[], name=****, schema=pg_catalog, type=SYSTEM INDEX]