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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.architecture.blueprints.todoapp.di
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import dagger.Binds
import dagger.MapKey
import dagger.Module
import javax.inject.Inject
import javax.inject.Provider
import kotlin.reflect.KClass
/**
* ViewModelFactory which uses Dagger to create the instances.
*/
class TodoViewModelFactory @Inject constructor(
private val creators: @JvmSuppressWildcards Map<Class<out ViewModel>, Provider<ViewModel>>
) : ViewModelProvider.Factory {
override fun <T : ViewModel> create(modelClass: Class<T>): T {
var creator: Provider<out ViewModel>? = creators[modelClass]
if (creator == null) {
for ((key, value) in creators) {
if (modelClass.isAssignableFrom(key)) {
creator = value
break
}
}
}
if (creator == null) {
throw IllegalArgumentException("Unknown model class: $modelClass")
}
try {
@Suppress("UNCHECKED_CAST")
return creator.get() as T
} catch (e: Exception) {
throw RuntimeException(e)
}
}
}
@Module
internal abstract class ViewModelBuilder {
@Binds
internal abstract fun bindViewModelFactory(
factory: TodoViewModelFactory
): ViewModelProvider.Factory
}
@Target(
AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER
)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
annotation class ViewModelKey(val value: KClass<out ViewModel>)