I have a longish question so please bear with me: ...

# android

[ayan]

I have a longish question so please bear with me: I have a doSomething() (inside a class) that does some work. This doSomething() works with data of RealDatatypeA that implements the builder pattern. This doSomething() is called from a different randomFunction() that passes into it the data of datatypeA. I have a similar randomFunction2() that works with datatypeB which also implements the builder. In effect, both functions do identical tasks but work with different data types and have different call sites. I want to consolidate the 2 operations so that instead of having 2 copies of similar looking functions, i can have just one.

To do this, I made an interface interface TheThing<T>.

interface TheThing<T> {
  fun setSomeProperty(id): T
}

This interface is implemented as shown below and the implementation needs to mirror all the builder functions to the original data type (RealDatatypeA) as shown below

class Impl: TheThing<RealDatatypeA.Builder> {
  override fun setSomeProperty(id: String): RealDatatypeA.Builder {
    return pp.setSomeProperty(id)
  }
}

I use this interface in doSomething() as a param

class SomeClass @Inject constructor(
  private val notImportant: NotImportant
){
fun <P:TheThing<P>> doSomething(dataA: P)
...

Now I need to call doSomething() from another function someClass.doSomething() like this:

fun randomFunction() {
  someClass.doSomething(datatypeA)

This datatypeA can also be datatypeB (depending on when this gets called). So here are the 2 questions:
1. In the Impl, how do I actually pass on the interface builder calls to the real builder calls?
2. In randomFunction() , I can’t call doSomething(datatypeA) just like this. I see an error that says Required: TheThing<TypeVariable(P)> Found: RealDatatypeA
How do I solve for this?