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.launcher3.util;
18
19import android.os.Looper;
20
21import com.android.launcher3.LauncherModel;
22import com.android.launcher3.config.ProviderConfig;
23
24/**
25 * A set of utility methods for thread verification.
26 */
27public class Preconditions {
28
29    public static void assertNotNull(Object o) {
30        if (ProviderConfig.IS_DOGFOOD_BUILD && o == null) {
31            throw new IllegalStateException();
32        }
33    }
34
35    public static void assertWorkerThread() {
36        if (ProviderConfig.IS_DOGFOOD_BUILD && !isSameLooper(LauncherModel.getWorkerLooper())) {
37            throw new IllegalStateException();
38        }
39    }
40
41    public static void assertUIThread() {
42        if (ProviderConfig.IS_DOGFOOD_BUILD && !isSameLooper(Looper.getMainLooper())) {
43            throw new IllegalStateException();
44        }
45    }
46
47    public static void assertNonUiThread() {
48        if (ProviderConfig.IS_DOGFOOD_BUILD && isSameLooper(Looper.getMainLooper())) {
49            throw new IllegalStateException();
50        }
51    }
52
53    private static boolean isSameLooper(Looper looper) {
54        return Looper.myLooper() == looper;
55    }
56}
57