1/*
2 * Copyright 2018 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.media;
18
19import android.media.AudioAttributes;
20import android.util.Log;
21
22import androidx.annotation.NonNull;
23import androidx.annotation.RequiresApi;
24
25import java.lang.reflect.InvocationTargetException;
26import java.lang.reflect.Method;
27
28@RequiresApi(21)
29class AudioAttributesCompatApi21 {
30    private static final String TAG = "AudioAttributesCompat";
31
32    // used to introspect AudioAttributes @hidden API
33    // I'm sorry, CheckStyle, but this is much more readable
34    private static Method sAudioAttributesToLegacyStreamType;
35
36    public static int toLegacyStreamType(Wrapper aaWrap) {
37        final AudioAttributes aaObject = aaWrap.unwrap();
38        try {
39            if (sAudioAttributesToLegacyStreamType == null) {
40                sAudioAttributesToLegacyStreamType = AudioAttributes.class.getMethod(
41                        "toLegacyStreamType", AudioAttributes.class);
42            }
43            Object result = sAudioAttributesToLegacyStreamType.invoke(
44                    null, aaObject);
45            return (Integer) result;
46        } catch (NoSuchMethodException | InvocationTargetException
47                | IllegalAccessException | ClassCastException e) {
48            Log.w(TAG, "getLegacyStreamType() failed on API21+", e);
49            return -1; // AudioSystem.STREAM_DEFAULT
50        }
51    }
52
53    static final class Wrapper {
54        private AudioAttributes mWrapped;
55        private Wrapper(AudioAttributes obj) {
56            mWrapped = obj;
57        }
58        public static Wrapper wrap(@NonNull AudioAttributes obj) {
59            if (obj == null) {
60                throw new IllegalArgumentException("AudioAttributesApi21.Wrapper cannot wrap null");
61            }
62            return new Wrapper(obj);
63        }
64        public AudioAttributes unwrap() {
65            return mWrapped;
66        }
67    }
68
69    private AudioAttributesCompatApi21() {
70    }
71}
72