Aurimas Liutikas | 88c7ff1 | 2023-08-10 12:42:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 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.internal.telephony; |
| 18 | |
| 19 | import android.annotation.DurationMillisLong; |
| 20 | import android.annotation.ElapsedRealtimeLong; |
| 21 | import android.annotation.NonNull; |
| 22 | import android.app.time.UnixEpochTime; |
| 23 | |
| 24 | import java.time.Duration; |
| 25 | import java.util.Objects; |
| 26 | |
| 27 | /** NITZ information and associated metadata. */ |
| 28 | public final class NitzSignal { |
| 29 | |
| 30 | @ElapsedRealtimeLong private final long mReceiptElapsedMillis; |
| 31 | @NonNull private final NitzData mNitzData; |
| 32 | @DurationMillisLong private final long mAgeMillis; |
| 33 | |
| 34 | /** |
| 35 | * @param receiptElapsedMillis the time according to {@link |
| 36 | * android.os.SystemClock#elapsedRealtime()} when the NITZ signal was first received by |
| 37 | * the platform code |
| 38 | * @param nitzData the NITZ data |
| 39 | * @param ageMillis the age of the NITZ when it was passed to the platform, e.g. if it was |
| 40 | * cached by the modem for a period of time. Must not be negative. |
| 41 | */ |
| 42 | public NitzSignal( |
| 43 | @ElapsedRealtimeLong long receiptElapsedMillis, |
| 44 | @NonNull NitzData nitzData, |
| 45 | long ageMillis) { |
| 46 | mReceiptElapsedMillis = receiptElapsedMillis; |
| 47 | mNitzData = Objects.requireNonNull(nitzData); |
| 48 | if (ageMillis < 0) { |
| 49 | throw new IllegalArgumentException("ageMillis < 0"); |
| 50 | } |
| 51 | mAgeMillis = ageMillis; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns the time according to {@link android.os.SystemClock#elapsedRealtime()} when the NITZ |
| 56 | * signal was first received by the platform code. |
| 57 | */ |
| 58 | @ElapsedRealtimeLong |
| 59 | public long getReceiptElapsedRealtimeMillis() { |
| 60 | return mReceiptElapsedMillis; |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Returns the NITZ data. |
| 65 | */ |
| 66 | @NonNull |
| 67 | public NitzData getNitzData() { |
| 68 | return mNitzData; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Returns the age of the NITZ when it was passed to the platform, e.g. if it was cached by the |
| 73 | * modem for a period of time. Must not be negative. |
| 74 | */ |
| 75 | @DurationMillisLong |
| 76 | public long getAgeMillis() { |
| 77 | return mAgeMillis; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Returns a derived property of {@code receiptElapsedMillis - ageMillis}, i.e. the time |
| 82 | * according to the elapsed realtime clock when the NITZ signal was actually received by this |
| 83 | * device taking into time it was cached by layers before the RIL. |
| 84 | */ |
| 85 | @ElapsedRealtimeLong |
| 86 | public long getAgeAdjustedElapsedRealtimeMillis() { |
| 87 | return mReceiptElapsedMillis - mAgeMillis; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Creates a {@link UnixEpochTime} containing the UTC time as the number of milliseconds since |
| 92 | * the start of the Unix epoch. The reference time is the time according to the elapsed realtime |
| 93 | * clock when that would have been the time, accounting for receipt time and age. |
| 94 | */ |
| 95 | public UnixEpochTime createTimeSignal() { |
| 96 | return new UnixEpochTime( |
| 97 | getAgeAdjustedElapsedRealtimeMillis(), |
| 98 | getNitzData().getCurrentTimeInMillis()); |
| 99 | } |
| 100 | |
| 101 | @Override |
| 102 | public boolean equals(Object o) { |
| 103 | if (this == o) { |
| 104 | return true; |
| 105 | } |
| 106 | if (o == null || getClass() != o.getClass()) { |
| 107 | return false; |
| 108 | } |
| 109 | NitzSignal that = (NitzSignal) o; |
| 110 | return mReceiptElapsedMillis == that.mReceiptElapsedMillis |
| 111 | && mAgeMillis == that.mAgeMillis |
| 112 | && mNitzData.equals(that.mNitzData); |
| 113 | } |
| 114 | |
| 115 | @Override |
| 116 | public int hashCode() { |
| 117 | return Objects.hash(mReceiptElapsedMillis, mNitzData, mAgeMillis); |
| 118 | } |
| 119 | |
| 120 | @Override |
| 121 | public String toString() { |
| 122 | return "NitzSignal{" |
| 123 | + "mReceiptElapsedMillis=" + Duration.ofMillis(mReceiptElapsedMillis) |
| 124 | + ", mNitzData=" + mNitzData |
| 125 | + ", mAgeMillis=" + mAgeMillis |
| 126 | + '}'; |
| 127 | } |
| 128 | } |