1/* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package androidx.navigation; 18 19import android.os.Bundle; 20import android.support.annotation.NonNull; 21import android.support.annotation.Nullable; 22 23/** 24 * An empty {@link Navigator} used to test {@link SimpleNavigatorProvider}. 25 */ 26@Navigator.Name(EmptyNavigator.NAME) 27class EmptyNavigator extends Navigator<NavDestination> { 28 static final String NAME = "empty"; 29 30 @NonNull 31 @Override 32 public NavDestination createDestination() { 33 return new NavDestination(this); 34 } 35 36 @Override 37 public void navigate(@NonNull NavDestination destination, @Nullable Bundle args, 38 @Nullable NavOptions navOptions) { 39 throw new IllegalStateException("navigate is not supported"); 40 } 41 42 @Override 43 public boolean popBackStack() { 44 throw new IllegalStateException("popBackStack is not supported"); 45 } 46} 47