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/*
* Copyright (C) 2020 The Dagger Authors.
*
* 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 dagger.hilt.android.internal.lifecycle;
import android.app.Application;
import androidx.lifecycle.SavedStateViewModelFactory;
import androidx.lifecycle.ViewModelProvider;
import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.activity.ComponentActivity;
import androidx.savedstate.SavedStateRegistryOwner;
import dagger.Module;
import dagger.hilt.EntryPoint;
import dagger.hilt.EntryPoints;
import dagger.hilt.InstallIn;
import dagger.hilt.android.components.ActivityComponent;
import dagger.hilt.android.components.FragmentComponent;
import dagger.hilt.android.internal.builders.ViewModelComponentBuilder;
import dagger.multibindings.Multibinds;
import java.util.Set;
import javax.inject.Inject;
/**
* Modules and entry points for the default view model factory used by activities and fragments
* annotated with @AndroidEntryPoint.
*
* <p>Entry points are used to acquire the factory because injected fields in the generated
* activities and fragments are ignored by Dagger when using the transform due to the generated
* class not being part of the hierarchy during compile time.
*/
public final class DefaultViewModelFactories {
/**
* Retrieves the default view model factory for the activity.
*
* <p>Do not use except in Hilt generated code!
*/
public static ViewModelProvider.Factory getActivityFactory(ComponentActivity activity,
ViewModelProvider.Factory delegateFactory) {
return EntryPoints.get(activity, ActivityEntryPoint.class)
.getHiltInternalFactoryFactory()
.fromActivity(activity, delegateFactory);
}
/**
* Retrieves the default view model factory for the activity.
*
* <p>Do not use except in Hilt generated code!
*/
public static ViewModelProvider.Factory getFragmentFactory(
Fragment fragment, ViewModelProvider.Factory delegateFactory) {
return EntryPoints.get(fragment, FragmentEntryPoint.class)
.getHiltInternalFactoryFactory()
.fromFragment(fragment, delegateFactory);
}
/** Internal factory for the Hilt ViewModel Factory. */
public static final class InternalFactoryFactory {
private final Application application;
private final Set<String> keySet;
private final ViewModelComponentBuilder viewModelComponentBuilder;
@Inject
InternalFactoryFactory(
Application application,
@HiltViewModelMap.KeySet Set<String> keySet,
ViewModelComponentBuilder viewModelComponentBuilder) {
this.application = application;
this.keySet = keySet;
this.viewModelComponentBuilder = viewModelComponentBuilder;
}
ViewModelProvider.Factory fromActivity(
ComponentActivity activity, ViewModelProvider.Factory delegateFactory) {
return getHiltViewModelFactory(
activity,
activity.getIntent() != null ? activity.getIntent().getExtras() : null,
delegateFactory);
}
ViewModelProvider.Factory fromFragment(
Fragment fragment, ViewModelProvider.Factory delegateFactory) {
return getHiltViewModelFactory(fragment, fragment.getArguments(), delegateFactory);
}
private ViewModelProvider.Factory getHiltViewModelFactory(
SavedStateRegistryOwner owner,
@Nullable Bundle defaultArgs,
@Nullable ViewModelProvider.Factory extensionDelegate) {
ViewModelProvider.Factory delegate = extensionDelegate == null
? new SavedStateViewModelFactory(application, owner, defaultArgs)
: extensionDelegate;
return new HiltViewModelFactory(
owner, defaultArgs, keySet, delegate, viewModelComponentBuilder);
}
}
/** The activity module to declare the optional factories. */
@Module
@InstallIn(ActivityComponent.class)
interface ActivityModule {
@Multibinds
@HiltViewModelMap.KeySet
abstract Set<String> viewModelKeys();
}
/** The activity entry point to retrieve the factory. */
@EntryPoint
@InstallIn(ActivityComponent.class)
public interface ActivityEntryPoint {
InternalFactoryFactory getHiltInternalFactoryFactory();
}
/** The fragment entry point to retrieve the factory. */
@EntryPoint
@InstallIn(FragmentComponent.class)
public interface FragmentEntryPoint {
InternalFactoryFactory getHiltInternalFactoryFactory();
}
private DefaultViewModelFactories() {}
}
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