CountryCode to Resource Mapper

1-CountryProvider.kt

interface CountryProvider {
  fun getCountryCode(): String
}

2-ResourceProviderContainer.kt

abstract class ResourceProviderContainer<T>(private val countryProvider: CountryProvider) {
  private val map: Map<String, T> by lazy { getCountryToResourceProviderMap() }

  fun get() = map[countryProvider.getCountryCode()] ?: getDefault()
  protected abstract fun getCountryToResourceProviderMap(): Map<String, T>
  protected abstract fun getDefault(): T
}

3-SingleResourceSample.kt

class SingleResourceProviderContainer(countryProvider: CountryProvider) :
  ResourceProviderContainer<Int>(countryProvider) {

  override fun getCountryToResourceProviderMap() = mapOf(
    "MX" to R.string.title_mx,
    "CO" to R.string.title_co
  )

  override fun getDefault() = R.string.title_default
}

4-MultipleResourceSample.kt

interface MultipleResourceProvider {
  fun getSubtitle(): Int
  fun getDrawable(): Int
}

class MultipleResourceProviderContainer(countryProvider: CountryProvider) :
  ResourceProviderContainer<MultipleResourceProvider>(countryProvider) {

  override fun getCountryToResourceProviderMap() = mapOf(
    "MX" to object : MultipleResourceProvider {
      override fun getSubtitle() = R.string.subtitle_mx
      override fun getDrawable() = R.drawable.ic_drawable_mx
    },
    "CO" to object : MultipleResourceProvider {
      override fun getSubtitle() = R.string.subtitle_co
      override fun getDrawable() = R.drawable.ic_drawable_co
    }
  )

  override fun getDefault() = object : MultipleResourceProvider {
    override fun getSubtitle() = R.string.subtitle_default
    override fun getDrawable() = R.drawable.ic_drawable_default
  }
}

5-UsageSample.kt

val countryProvider: CountryProvider // Should be injected
val singleResourceProvider: ResourceProviderContainer<Int> // Should be injected as SingleResourceProviderContainer
val multipleResourceProvider: ResourceProviderContainer<MultipleResourceProvider> // Should be injected as MultipleResourceProviderContainer

...

val title = singleResourceProvider.get()
val subtitle = multipleResourceProvider.get().getSubtitle()
val drawable = multipleResourceProvider.get().getDrawable()