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80 lines
3.2 KiB
Java
80 lines
3.2 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.common.base.Preconditions.checkArgument;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Ordering;
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import org.joda.time.DateTime;
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import org.joda.time.DateTimeZone;
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/** Utilities methods and constants related to Joda {@link DateTime} objects. */
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public class DateTimeUtils {
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/** The start of the epoch, in a convenient constant. */
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public static final DateTime START_OF_TIME = new DateTime(0, DateTimeZone.UTC);
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/**
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* A date in the far future that we can treat as infinity.
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*
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* <p>This value is (2^63-1)/1000 rounded down. AppEngine stores dates as 64 bit microseconds, but
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* Java uses milliseconds, so this is the largest representable date that will survive a
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* round-trip through the datastore.
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*/
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public static final DateTime END_OF_TIME = new DateTime(Long.MAX_VALUE / 1000, DateTimeZone.UTC);
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/** Returns the earliest of a number of given {@link DateTime} instances. */
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public static DateTime earliestOf(DateTime first, DateTime... rest) {
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return earliestOf(Lists.asList(first, rest));
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}
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/** Returns the earliest element in a {@link DateTime} iterable. */
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public static DateTime earliestOf(Iterable<DateTime> dates) {
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checkArgument(!Iterables.isEmpty(dates));
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return Ordering.<DateTime>natural().min(dates);
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}
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/** Returns the latest of a number of given {@link DateTime} instances. */
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public static DateTime latestOf(DateTime first, DateTime... rest) {
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return latestOf(Lists.asList(first, rest));
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}
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/** Returns the latest element in a {@link DateTime} iterable. */
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public static DateTime latestOf(Iterable<DateTime> dates) {
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checkArgument(!Iterables.isEmpty(dates));
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return Ordering.<DateTime>natural().max(dates);
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}
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/** Returns whether the first {@link DateTime} is equal to or earlier than the second. */
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public static boolean isBeforeOrAt(DateTime timeToCheck, DateTime timeToCompareTo) {
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return !timeToCheck.isAfter(timeToCompareTo);
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}
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/** Returns whether the first {@link DateTime} is equal to or later than the second. */
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public static boolean isAtOrAfter(DateTime timeToCheck, DateTime timeToCompareTo) {
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return !timeToCheck.isBefore(timeToCompareTo);
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}
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/**
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* Adds years to a date, in the {@code Duration} sense of semantic years. Use this instead of
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* {@link DateTime#plusYears} to ensure that we never end up on February 29.
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*/
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public static DateTime leapSafeAddYears(DateTime now, int years) {
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checkArgument(years >= 0);
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return years == 0 ? now : now.plusYears(1).plusYears(years - 1);
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}
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}
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