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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.libraries.mobiledatadownload.internal.logging;
import static com.google.common.math.LongMath.checkedAdd;
import static com.google.common.math.LongMath.checkedMultiply;
import static com.google.common.math.LongMath.checkedSubtract;
import com.google.protobuf.Timestamp;
/**
* Utilities to help create/manipulate {@code protobuf/timestamp.proto}.
*/
public class TimestampsUtil {
// Timestamp for "0001-01-01T00:00:00Z"
static final long TIMESTAMP_SECONDS_MIN = -62135596800L;
// Timestamp for "9999-12-31T23:59:59Z"
static final long TIMESTAMP_SECONDS_MAX = 253402300799L;
static final int NANOS_PER_SECOND = 1000000000;
static final int NANOS_PER_MILLISECOND = 1000000;
static final int NANOS_PER_MICROSECOND = 1000;
static final int MILLIS_PER_SECOND = 1000;
static final int MICROS_PER_SECOND = 1000000;
@SuppressWarnings("GoodTime") // this is a legacy conversion API
public static long toMillis(Timestamp timestamp) {
checkValid(timestamp);
return checkedAdd(
checkedMultiply(timestamp.getSeconds(), MILLIS_PER_SECOND),
timestamp.getNanos() / NANOS_PER_MILLISECOND);
}
/** Create a Timestamp from the number of milliseconds elapsed from the epoch. */
@SuppressWarnings("GoodTime") // this is a legacy conversion API
public static Timestamp fromMillis(long milliseconds) {
return normalizedTimestamp(
milliseconds / MILLIS_PER_SECOND,
(int) (milliseconds % MILLIS_PER_SECOND * NANOS_PER_MILLISECOND));
}
public static Timestamp checkValid(Timestamp timestamp) {
long seconds = timestamp.getSeconds();
int nanos = timestamp.getNanos();
if (!isValid(seconds, nanos)) {
throw new IllegalArgumentException(
String.format(
"Timestamp is not valid. See proto definition for valid values. "
+ "Seconds (%s) must be in range [-62,135,596,800, +253,402,"
+ "300,799]. "
+ "Nanos (%s) must be in range [0, +999,999,999].",
seconds, nanos));
}
return timestamp;
}
/**
* Returns true if the given number of seconds and nanos is a valid {@link Timestamp}. The
* {@code
* seconds} value must be in the range [-62,135,596,800, +253,402,300,799] (i.e., between
* 0001-01-01T00:00:00Z and 9999-12-31T23:59:59Z). The {@code nanos} value must be in the range
* [0, +999,999,999].
*
* <p><b>Note:</b> Negative second values with fractional seconds must still have non-negative
* nanos values that count forward in time.
*/
@SuppressWarnings("GoodTime") // this is a legacy conversion API
public static boolean isValid(long seconds, int nanos) {
if (seconds < TIMESTAMP_SECONDS_MIN || seconds > TIMESTAMP_SECONDS_MAX) {
return false;
}
if (nanos < 0 || nanos >= NANOS_PER_SECOND) {
return false;
}
return true;
}
static Timestamp normalizedTimestamp(long seconds, int nanos) {
if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) {
seconds = checkedAdd(seconds, nanos / NANOS_PER_SECOND);
nanos = (int) (nanos % NANOS_PER_SECOND);
}
if (nanos < 0) {
nanos =
(int)
(nanos
+ NANOS_PER_SECOND); // no overflow since nanos is negative
// (and we're adding)
seconds = checkedSubtract(seconds, 1);
}
Timestamp timestamp = Timestamp.newBuilder().setSeconds(seconds).setNanos(nanos).build();
return checkValid(timestamp);
}
}
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