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