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JavaTimeConversions.java
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JavaTimeConversions.java
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/*
* Copyright 2021 Google LLC
*
* 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.cloud.logging;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.math.LongMath.checkedAdd;
import static com.google.common.math.LongMath.checkedSubtract;
import com.google.protobuf.Timestamp;
import com.google.protobuf.util.Timestamps;
import java.time.Instant;
/**
* A utility class that provides conversions between:
*
* <ul>
* <li>Protobuf's {@link Timestamp} and {@link java.time.Instant}
* </ul>
*
* The class complements convertion methods that are currently not supported in the published
* protobuf-java-util. After migrating protobuf-java-util to Java 8 this class can be removed.
*
* @see <a href=
* "https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java-util">protobuf-java-util</a>
*/
class JavaTimeConversions {
static final long NANOS_PER_SECOND = 1000000000;
private JavaTimeConversions() {}
/**
* Converts a protobuf {@link Timestamp} to a {@link java.time.Instant}.
*
* @throws IllegalArgumentException if the given {@link Timestamp} is not valid. See {@link
* Timestamps#isValid}.
*/
public static Instant toJavaInstant(Timestamp timestamp) {
checkNotNull(timestamp);
timestamp = normalizedTimestamp(timestamp.getSeconds(), timestamp.getNanos());
return Instant.ofEpochSecond(timestamp.getSeconds(), timestamp.getNanos());
}
/**
* Converts a {@link java.time.Instant} to a protobuf {@link Timestamp}.
*
* @throws IllegalArgumentException if the given {@link java.time.Instant} cannot legally fit into
* a {@link Timestamp}. See {@link Timestamps#isValid}.
*/
public static Timestamp toProtoTimestamp(Instant instant) {
checkNotNull(instant);
return normalizedTimestamp(instant.getEpochSecond(), instant.getNano());
}
/** Exposes {@link Timestamps#normalizedTimestamp} internal method. */
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 Timestamps.checkValid(timestamp);
}
}