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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.android.systemui
import android.app.Activity
import android.app.Application
import android.app.Service
import android.content.BroadcastReceiver
import android.content.ContentProvider
import android.content.Context
import android.content.Intent
import android.util.Log
import androidx.core.app.AppComponentFactory
import com.android.systemui.dagger.ContextComponentHelper
import java.lang.reflect.InvocationTargetException
import java.util.concurrent.ExecutionException
import javax.inject.Inject
/**
* Implementation of AppComponentFactory that injects into constructors.
*
* This class sets up dependency injection when creating our application.
*
* Activities, Services, and BroadcastReceivers support dependency injection into
* their constructors.
*
* ContentProviders support injection into member variables - _not_ constructors.
*/
abstract class SystemUIAppComponentFactoryBase : AppComponentFactory() {
companion object {
private const val TAG = "AppComponentFactory"
// Must be static due to http://b/141008541.
var systemUIInitializer: SystemUIInitializer? = null
}
@set:Inject
lateinit var componentHelper: ContextComponentHelper
/**
* Returns a new [SystemUIInitializer].
*
* The returned implementation should be specific to your build.
*/
protected abstract fun createSystemUIInitializer(context: Context): SystemUIInitializer
private fun createSystemUIInitializerInternal(context: Context): SystemUIInitializer {
return systemUIInitializer ?: run {
val initializer = createSystemUIInitializer(context.applicationContext)
try {
initializer.init(false)
} catch (exception: ExecutionException) {
throw RuntimeException("Failed to initialize SysUI", exception)
} catch (exception: InterruptedException) {
throw RuntimeException("Failed to initialize SysUI", exception)
}
initializer.sysUIComponent.inject(
this@SystemUIAppComponentFactoryBase
)
systemUIInitializer = initializer
return initializer
}
}
override fun instantiateApplicationCompat(cl: ClassLoader, className: String): Application {
val app = super.instantiateApplicationCompat(cl, className)
if (app !is ContextInitializer) {
throw RuntimeException("App must implement ContextInitializer")
} else {
app.setContextAvailableCallback { context ->
createSystemUIInitializerInternal(context)
}
}
return app
}
override fun instantiateProviderCompat(cl: ClassLoader, className: String): ContentProvider {
val contentProvider = super.instantiateProviderCompat(cl, className)
if (contentProvider is ContextInitializer) {
contentProvider.setContextAvailableCallback { context ->
val initializer = createSystemUIInitializerInternal(context)
val rootComponent = initializer.sysUIComponent
try {
val injectMethod = rootComponent.javaClass
.getMethod("inject", contentProvider.javaClass)
injectMethod.invoke(rootComponent, contentProvider)
} catch (e: NoSuchMethodException) {
Log.w(TAG, "No injector for class: " + contentProvider.javaClass, e)
} catch (e: IllegalAccessException) {
Log.w(TAG, "No injector for class: " + contentProvider.javaClass, e)
} catch (e: InvocationTargetException) {
Log.w(TAG, "No injector for class: " + contentProvider.javaClass, e)
}
initializer
}
}
return contentProvider
}
override fun instantiateActivityCompat(
cl: ClassLoader,
className: String,
intent: Intent?
): Activity {
if (!this::componentHelper.isInitialized) {
// This shouldn't happen, but is seen on occasion.
// Bug filed against framework to take a look: http://b/141008541
systemUIInitializer?.sysUIComponent?.inject(this@SystemUIAppComponentFactoryBase)
}
return componentHelper.resolveActivity(className)
?: super.instantiateActivityCompat(cl, className, intent)
}
override fun instantiateServiceCompat(
cl: ClassLoader,
className: String,
intent: Intent?
): Service {
if (!this::componentHelper.isInitialized) {
// This shouldn't happen, but does when a device is freshly formatted.
// Bug filed against framework to take a look: http://b/141008541
systemUIInitializer?.sysUIComponent?.inject(this@SystemUIAppComponentFactoryBase)
}
return componentHelper.resolveService(className)
?: super.instantiateServiceCompat(cl, className, intent)
}
override fun instantiateReceiverCompat(
cl: ClassLoader,
className: String,
intent: Intent?
): BroadcastReceiver {
if (!this::componentHelper.isInitialized) {
// This shouldn't happen, but does when a device is freshly formatted.
// Bug filed against framework to take a look: http://b/141008541
systemUIInitializer?.sysUIComponent?.inject(this@SystemUIAppComponentFactoryBase)
}
return componentHelper.resolveBroadcastReceiver(className)
?: super.instantiateReceiverCompat(cl, className, intent)
}
/**
* An Interface for classes that can be notified when an Application Context becomes available.
*
* An instance of this will be passed to implementers of [ContextInitializer].
*/
fun interface ContextAvailableCallback {
/** Notifies when the Application Context is available. */
fun onContextAvailable(context: Context): SystemUIInitializer
}
/**
* Interface for classes that can be constructed by the system before a context is available.
*
* This is intended for [Application] and [ContentProvider] implementations that
* either may not have a Context until some point after construction or are themselves
* a [Context].
*
* Implementers will be passed a [ContextAvailableCallback] that they should call as soon
* as an Application Context is ready.
*/
interface ContextInitializer {
/**
* Called to supply the [ContextAvailableCallback] that should be called when an
* Application [Context] is available.
*/
fun setContextAvailableCallback(callback: ContextAvailableCallback)
}
}
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