1 /*
2  * Copyright (C) 2021 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 
17 package com.android.server.tare;
18 
19 import static android.app.tare.EconomyManager.CAKE_IN_ARC;
20 
21 import android.annotation.NonNull;
22 
23 import com.android.internal.annotations.VisibleForTesting;
24 
25 import java.time.Clock;
26 
27 class TareUtils {
28     @VisibleForTesting
29     static Clock sSystemClock = Clock.systemUTC();
30 
getCurrentTimeMillis()31     static long getCurrentTimeMillis() {
32         return sSystemClock.millis();
33     }
34 
cakeToArc(long cakes)35     static int cakeToArc(long cakes) {
36         return (int) (cakes / CAKE_IN_ARC);
37     }
38 
39     @NonNull
cakeToString(long cakes)40     static String cakeToString(long cakes) {
41         if (cakes == 0) {
42             return "0 ARCs";
43         }
44         final long sub = cakes % CAKE_IN_ARC;
45         final long arcs = cakeToArc(cakes);
46         if (arcs == 0) {
47             return sub == 1
48                     ? sub + " cake"
49                     : sub + " cakes";
50         }
51         StringBuilder sb = new StringBuilder();
52         sb.append(arcs);
53         if (sub != 0) {
54             sb.append(".").append(String.format("%03d", Math.abs(sub) / (CAKE_IN_ARC / 1000)));
55         }
56         sb.append(" ARC");
57         if (arcs != 1 || sub != 0) {
58             sb.append("s");
59         }
60         return sb.toString();
61     }
62 
63     /** Returns a standardized format for printing userId+pkgName combinations. */
64     @NonNull
appToString(int userId, String pkgName)65     static String appToString(int userId, String pkgName) {
66         return "<" + userId + ">" + pkgName;
67     }
68 }
69