TestNavigatorProvider.kt
/*
* Copyright 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 androidx.navigation.testing
import androidx.navigation.NavDestination
import androidx.navigation.NavGraphNavigator
import androidx.navigation.Navigator
import androidx.navigation.NavigatorProvider
import java.lang.IllegalStateException
/**
* A [NavigatorProvider] for testing that only parses
* [navigation graphs][androidx.navigation.NavGraph] and [destinations][NavDestination].
*/
internal class TestNavigatorProvider : NavigatorProvider() {
/**
* A [Navigator] that only supports creating destinations.
*/
private val navigator = object : Navigator<NavDestination>() {
override fun createDestination() = NavDestination("test")
}
init {
addNavigator(NavGraphNavigator(this))
addNavigator("test", navigator)
}
override fun <T : Navigator<out NavDestination>> getNavigator(name: String): T {
return try {
super.getNavigator(name)
} catch (e: IllegalStateException) {
@Suppress("UNCHECKED_CAST")
navigator as T
}
}
}