/* * Java GPX Library (@__identifier__@). * Copyright (c) @__year__@ Franz Wilhelmstötter * * 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. * * Author: * Franz Wilhelmstötter ([email protected]) */ package io.jenetics.jpx; import java.io.DataInput; import java.io.DataOutput; import java.io.IOException; import java.time.Instant; import java.time.ZoneOffset; import java.time.ZonedDateTime; import java.time.temporal.ChronoUnit; import java.util.Objects; /** * @author <a href="mailto:[email protected]">Franz Wilhelmstötter</a> * @version 2.0 * @since 1.2 */ final class ZonedDateTimes { private ZonedDateTimes() { } static void write(final ZonedDateTime time, final DataOutput out) throws IOException { IO.writeLong(time.toEpochSecond(), out); writeZoneOffset(time.getOffset(), out); } private static void writeZoneOffset(final ZoneOffset os, final DataOutput out) throws IOException { final int offsetSecs = os.getTotalSeconds(); int offsetByte = offsetSecs%900 == 0 ? offsetSecs/900 : 127; out.writeByte(offsetByte); if (offsetByte == 127) { IO.writeInt(offsetSecs, out); } } static ZonedDateTime read(final DataInput in) throws IOException { final long seconds = IO.readLong(in); final ZoneOffset offset = readZoneOffset(in); return ZonedDateTime.ofInstant(Instant.ofEpochSecond(seconds), offset); } private static ZoneOffset readZoneOffset(final DataInput in) throws IOException { int offsetByte = in.readByte(); return offsetByte == 127 ? ZoneOffset.ofTotalSeconds(IO.readInt(in)) : ZoneOffset.ofTotalSeconds(offsetByte*900); } /** * Return the hash code of the given date time object. Actually the hash * code of its {@link Instant}, truncated to seconds, is returned. The * argument may be {@code null}. * * @param a the date time, for which the hash code is calculated * @return the <em>truncated</em> hash code */ static int hashCode(final ZonedDateTime a) { return Objects.hashCode(toInstant(a)); } private static Instant toInstant(final ZonedDateTime zdt) { return zdt != null ? zdt.toInstant().truncatedTo(ChronoUnit.SECONDS) : null; } /** * Tests if the given date times represents the same point on the time-line. * The used resolution for comparision is <em>seconds</em>. If two * {@link ZonedDateTime} objects are equal to its seconds, they are treated * as equal, even if the milli-second part is different. The argument may be * {@code null}. * * @param a the first date time * @param b the second date time * @return {@code true} if the two date times represents the same point on * the time-line, {@code false} otherwise */ static boolean equals(final ZonedDateTime a, final ZonedDateTime b) { return Objects.equals(toInstant(a), toInstant(b)); } }