1/*
2 * Copyright (C) 2016 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 com.android.documentsui.testing;
18
19import static junit.framework.Assert.assertEquals;
20import static junit.framework.Assert.assertTrue;
21
22import android.os.Parcel;
23import android.os.Parcelable;
24
25import java.util.function.BiPredicate;
26
27public class Parcelables {
28
29    private Parcelables() {}
30
31    public static <T extends Parcelable> void assertParcelable(T p, int flags) {
32        final T restored = parcel(p, flags);
33
34        assertEquals(p, restored);
35    }
36
37    public static <T extends Parcelable> void assertParcelable(
38            T p, int flags, BiPredicate<T, T> pred) {
39        T restored = parcel(p, flags);
40
41        assertTrue(pred.test(p, restored));
42    }
43
44    private static <T extends Parcelable> T parcel(T p, int flags) {
45        Parcel write = Parcel.obtain();
46        Parcel read = Parcel.obtain();
47        final T restored;
48        try {
49            write.writeParcelable(p, flags);
50            final byte[] data = write.marshall();
51
52            read.unmarshall(data, 0, data.length);
53            read.setDataPosition(0);
54            restored = read.readParcelable(p.getClass().getClassLoader());
55        } finally {
56            write.recycle();
57            read.recycle();
58        }
59
60        return restored;
61    }
62}
63