ViewModelFactory

viewModelFactory.kt

class ViewModelFactory private constructor(
    private val githubRepository: GithubRepository
) :
    ViewModelProvider.NewInstanceFactory() {

    @Suppress("UNCHECKED_CAST")
    override fun <T : ViewModel> create(modelClass: Class<T>): T {
        if (modelClass.isAssignableFrom(DetailViewModel::class.java)) {
            return DetailViewModel(githubRepository) as T
        }
        throw IllegalArgumentException("Unknown ViewModel class: " + modelClass.name)
    }

    companion object {
        @Volatile
        private var instance: ViewModelFactory? = null
        fun getInstance(context: Context): ViewModelFactory =
            instance ?: synchronized(this) {
                instance ?: ViewModelFactory(
                    Injection.provideRepository(context)
                )
            }.also { instance = it }
    }
}