ReplicaIsland ported to the KotlinIsland.

[Jim Andreas]

Hi All,

I have completed a preliminary port of ReplicaIsland to the Island of Kotlin.

Link:

https://github.com/jimandreas/ReplicaIslandKotlin

Still working on getting the last few Lint errors worked out.   But the game builds and plays just fine.

Jim A

[Chris Pruett]

Hi Jim,

This is awesome, thanks for sharing!

I don’t know a ton about Kotlin beyond that it is intended to be interoperable with Java and comparatively concise.  What was the port work like?  Mostly syntactical or did you need to change the way things worked anywhere?

Cheers,

Chris

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[Jim Andreas]

Hi Chris,

First of all - Thank *you* and the Islanders for creating ReplicaIsland and sharing the code with the world.   And for explaining its design and function in numerous talks and posts.   It is a great volume of work to study.

The port of the Java code to Kotlin was relatively straightforward.  It involved a lot of "Control-Alt-Shift-K" certainly, fixing up minor confusions from the conversion process and play-testing.   The last part was fun!   There was one tricky bit in the ObjectManager module - the findByClass() type-casting operation needed a bit of help.  My solution is shown below.   And there were some unusual differences in byte processing that needed workarounds.   In terms of time, I estimate that I spent about equal hours cleaning up lint complaints and play testing.   The structure of the Java code was "resilient" - in other words I didn't break it too often :-).

ObjectManager.kt:

/**
 * Finds a child object by its type. Note that this may invoke the class loader and therefore
 * may be slow.
 * @param classObject The class type to search for (e.g. BaseObject.class).
 */
fun <T> findByClass(classObject: Class<T>): T? {
  val count = mObjects.count
  for (i in 0 until count) {
    val currentObject = mObjects[i]

    if (currentObject!!.javaClass == classObject) {
       return currentObject as T
    }
  }
  return null
}