DoubleTriggerLiveData to use multiple transformation on an object

DoubleTriggerLiveData.kt

import androidx.lifecycle.LiveData
import androidx.lifecycle.MediatorLiveData

/**
 * DoubleTriggerLiveData to use multiple transformation on an object
 * */
class DoubleTriggerLiveData<A, B>(a: LiveData<A>, b: LiveData<B>) : MediatorLiveData<Pair<A?, B?>>() {
    init {
        addSource(a) { value = it to b.value }
        addSource(b) { value = a.value to it }
    }
}

ExampleViewModel.kt

// If each searchQuery or forceToRefresh value changed, getProducts() will be call

class ExampleViewModel : ViewModel() { 

    val isLoading = MutableLiveData<Boolean>()
    var searchQuery = MutableLiveData<String>().apply { value = "" }
    
    private val forceToRefresh = MutableLiveData<Boolean>().apply { value = true }

    private val doubleTriggerLiveData = DoubleTriggerLiveData(searchQuery, forceToRefresh)
    
    val catalogList: MutableLiveData<List<CatalogUIModel>>
        get() = _catalogList as MutableLiveData<List<CatalogUIModel>>
    
    private var _catalogList: LiveData<List<CatalogUIModel>> = doubleTriggerLiveData.switchMap {
        isLoading.value = true
        getProducts()
    }
}