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475 lines
18 KiB
Java
475 lines
18 KiB
Java
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of JSR-310 nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package build.tools.tzdb;
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import java.util.Objects;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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/**
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* A time-zone offset from Greenwich/UTC, such as {@code +02:00}.
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* <p>
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* A time-zone offset is the period of time that a time-zone differs from Greenwich/UTC.
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* This is usually a fixed number of hours and minutes.
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*
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* @since 1.8
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*/
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final class ZoneOffset implements Comparable<ZoneOffset> {
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/** Cache of time-zone offset by offset in seconds. */
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private static final ConcurrentMap<Integer, ZoneOffset> SECONDS_CACHE = new ConcurrentHashMap<>(16, 0.75f, 4);
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/** Cache of time-zone offset by ID. */
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private static final ConcurrentMap<String, ZoneOffset> ID_CACHE = new ConcurrentHashMap<>(16, 0.75f, 4);
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/**
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* The number of seconds per hour.
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*/
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private static final int SECONDS_PER_HOUR = 60 * 60;
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/**
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* The number of seconds per minute.
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*/
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private static final int SECONDS_PER_MINUTE = 60;
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/**
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* The number of minutes per hour.
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*/
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private static final int MINUTES_PER_HOUR = 60;
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/**
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* The abs maximum seconds.
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*/
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private static final int MAX_SECONDS = 18 * SECONDS_PER_HOUR;
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/**
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* Serialization version.
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*/
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private static final long serialVersionUID = 2357656521762053153L;
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/**
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* The time-zone offset for UTC, with an ID of 'Z'.
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*/
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public static final ZoneOffset UTC = ZoneOffset.ofTotalSeconds(0);
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/**
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* Constant for the maximum supported offset.
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*/
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public static final ZoneOffset MIN = ZoneOffset.ofTotalSeconds(-MAX_SECONDS);
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/**
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* Constant for the maximum supported offset.
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*/
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public static final ZoneOffset MAX = ZoneOffset.ofTotalSeconds(MAX_SECONDS);
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/**
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* The total offset in seconds.
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*/
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private final int totalSeconds;
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/**
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* The string form of the time-zone offset.
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*/
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private final transient String id;
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//-----------------------------------------------------------------------
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/**
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* Obtains an instance of {@code ZoneOffset} using the ID.
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* <p>
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* This method parses the string ID of a {@code ZoneOffset} to
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* return an instance. The parsing accepts all the formats generated by
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* {@link #getId()}, plus some additional formats:
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* <p><ul>
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* <li>{@code Z} - for UTC
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* <li>{@code +h}
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* <li>{@code +hh}
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* <li>{@code +hh:mm}
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* <li>{@code -hh:mm}
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* <li>{@code +hhmm}
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* <li>{@code -hhmm}
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* <li>{@code +hh:mm:ss}
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* <li>{@code -hh:mm:ss}
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* <li>{@code +hhmmss}
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* <li>{@code -hhmmss}
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* </ul><p>
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* Note that ± means either the plus or minus symbol.
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* <p>
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* The ID of the returned offset will be normalized to one of the formats
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* described by {@link #getId()}.
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* <p>
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* The maximum supported range is from +18:00 to -18:00 inclusive.
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*
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* @param offsetId the offset ID, not null
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* @return the zone-offset, not null
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* @throws DateTimeException if the offset ID is invalid
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*/
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@SuppressWarnings("fallthrough")
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public static ZoneOffset of(String offsetId) {
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Objects.requireNonNull(offsetId, "offsetId");
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// "Z" is always in the cache
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ZoneOffset offset = ID_CACHE.get(offsetId);
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if (offset != null) {
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return offset;
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}
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// parse - +h, +hh, +hhmm, +hh:mm, +hhmmss, +hh:mm:ss
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final int hours, minutes, seconds;
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switch (offsetId.length()) {
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case 2:
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offsetId = offsetId.charAt(0) + "0" + offsetId.charAt(1); // fallthru
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case 3:
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hours = parseNumber(offsetId, 1, false);
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minutes = 0;
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seconds = 0;
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break;
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case 5:
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hours = parseNumber(offsetId, 1, false);
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minutes = parseNumber(offsetId, 3, false);
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seconds = 0;
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break;
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case 6:
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hours = parseNumber(offsetId, 1, false);
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minutes = parseNumber(offsetId, 4, true);
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seconds = 0;
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break;
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case 7:
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hours = parseNumber(offsetId, 1, false);
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minutes = parseNumber(offsetId, 3, false);
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seconds = parseNumber(offsetId, 5, false);
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break;
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case 9:
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hours = parseNumber(offsetId, 1, false);
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minutes = parseNumber(offsetId, 4, true);
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seconds = parseNumber(offsetId, 7, true);
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break;
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default:
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throw new DateTimeException("Zone offset ID '" + offsetId + "' is invalid");
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}
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char first = offsetId.charAt(0);
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if (first != '+' && first != '-') {
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throw new DateTimeException("Zone offset ID '" + offsetId + "' is invalid: Plus/minus not found when expected");
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}
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if (first == '-') {
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return ofHoursMinutesSeconds(-hours, -minutes, -seconds);
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} else {
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return ofHoursMinutesSeconds(hours, minutes, seconds);
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}
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}
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/**
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* Parse a two digit zero-prefixed number.
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*
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* @param offsetId the offset ID, not null
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* @param pos the position to parse, valid
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* @param precededByColon should this number be prefixed by a precededByColon
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* @return the parsed number, from 0 to 99
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*/
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private static int parseNumber(CharSequence offsetId, int pos, boolean precededByColon) {
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if (precededByColon && offsetId.charAt(pos - 1) != ':') {
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throw new DateTimeException("Zone offset ID '" + offsetId + "' is invalid: Colon not found when expected");
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}
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char ch1 = offsetId.charAt(pos);
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char ch2 = offsetId.charAt(pos + 1);
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if (ch1 < '0' || ch1 > '9' || ch2 < '0' || ch2 > '9') {
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throw new DateTimeException("Zone offset ID '" + offsetId + "' is invalid: Non numeric characters found");
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}
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return (ch1 - 48) * 10 + (ch2 - 48);
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}
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//-----------------------------------------------------------------------
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/**
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* Obtains an instance of {@code ZoneOffset} using an offset in hours.
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*
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* @param hours the time-zone offset in hours, from -18 to +18
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* @return the zone-offset, not null
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* @throws DateTimeException if the offset is not in the required range
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*/
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public static ZoneOffset ofHours(int hours) {
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return ofHoursMinutesSeconds(hours, 0, 0);
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}
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/**
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* Obtains an instance of {@code ZoneOffset} using an offset in
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* hours and minutes.
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* <p>
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* The sign of the hours and minutes components must match.
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* Thus, if the hours is negative, the minutes must be negative or zero.
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* If the hours is zero, the minutes may be positive, negative or zero.
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*
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* @param hours the time-zone offset in hours, from -18 to +18
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* @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours
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* @return the zone-offset, not null
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* @throws DateTimeException if the offset is not in the required range
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*/
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public static ZoneOffset ofHoursMinutes(int hours, int minutes) {
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return ofHoursMinutesSeconds(hours, minutes, 0);
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}
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/**
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* Obtains an instance of {@code ZoneOffset} using an offset in
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* hours, minutes and seconds.
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* <p>
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* The sign of the hours, minutes and seconds components must match.
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* Thus, if the hours is negative, the minutes and seconds must be negative or zero.
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*
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* @param hours the time-zone offset in hours, from -18 to +18
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* @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours and seconds
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* @param seconds the time-zone offset in seconds, from 0 to ±59, sign matches hours and minutes
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* @return the zone-offset, not null
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* @throws DateTimeException if the offset is not in the required range
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*/
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public static ZoneOffset ofHoursMinutesSeconds(int hours, int minutes, int seconds) {
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validate(hours, minutes, seconds);
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int totalSeconds = totalSeconds(hours, minutes, seconds);
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return ofTotalSeconds(totalSeconds);
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}
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/**
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* Validates the offset fields.
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*
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* @param hours the time-zone offset in hours, from -18 to +18
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* @param minutes the time-zone offset in minutes, from 0 to ±59
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* @param seconds the time-zone offset in seconds, from 0 to ±59
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* @throws DateTimeException if the offset is not in the required range
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*/
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private static void validate(int hours, int minutes, int seconds) {
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if (hours < -18 || hours > 18) {
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throw new DateTimeException("Zone offset hours not in valid range: value " + hours +
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" is not in the range -18 to 18");
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}
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if (hours > 0) {
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if (minutes < 0 || seconds < 0) {
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throw new DateTimeException("Zone offset minutes and seconds must be positive because hours is positive");
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}
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} else if (hours < 0) {
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if (minutes > 0 || seconds > 0) {
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throw new DateTimeException("Zone offset minutes and seconds must be negative because hours is negative");
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}
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} else if ((minutes > 0 && seconds < 0) || (minutes < 0 && seconds > 0)) {
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throw new DateTimeException("Zone offset minutes and seconds must have the same sign");
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}
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if (Math.abs(minutes) > 59) {
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throw new DateTimeException("Zone offset minutes not in valid range: abs(value) " +
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Math.abs(minutes) + " is not in the range 0 to 59");
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}
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if (Math.abs(seconds) > 59) {
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throw new DateTimeException("Zone offset seconds not in valid range: abs(value) " +
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Math.abs(seconds) + " is not in the range 0 to 59");
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}
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if (Math.abs(hours) == 18 && (Math.abs(minutes) > 0 || Math.abs(seconds) > 0)) {
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throw new DateTimeException("Zone offset not in valid range: -18:00 to +18:00");
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}
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}
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/**
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* Calculates the total offset in seconds.
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*
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* @param hours the time-zone offset in hours, from -18 to +18
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* @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours and seconds
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* @param seconds the time-zone offset in seconds, from 0 to ±59, sign matches hours and minutes
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* @return the total in seconds
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*/
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private static int totalSeconds(int hours, int minutes, int seconds) {
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return hours * SECONDS_PER_HOUR + minutes * SECONDS_PER_MINUTE + seconds;
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}
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//-----------------------------------------------------------------------
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/**
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* Obtains an instance of {@code ZoneOffset} specifying the total offset in seconds
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* <p>
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* The offset must be in the range {@code -18:00} to {@code +18:00}, which corresponds to -64800 to +64800.
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*
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* @param totalSeconds the total time-zone offset in seconds, from -64800 to +64800
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* @return the ZoneOffset, not null
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* @throws DateTimeException if the offset is not in the required range
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*/
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public static ZoneOffset ofTotalSeconds(int totalSeconds) {
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if (Math.abs(totalSeconds) > MAX_SECONDS) {
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throw new DateTimeException("Zone offset not in valid range: -18:00 to +18:00");
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}
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if (totalSeconds % (15 * SECONDS_PER_MINUTE) == 0) {
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Integer totalSecs = totalSeconds;
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ZoneOffset result = SECONDS_CACHE.get(totalSecs);
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if (result == null) {
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result = new ZoneOffset(totalSeconds);
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SECONDS_CACHE.putIfAbsent(totalSecs, result);
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result = SECONDS_CACHE.get(totalSecs);
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ID_CACHE.putIfAbsent(result.getId(), result);
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}
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return result;
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} else {
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return new ZoneOffset(totalSeconds);
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}
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}
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/**
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* Constructor.
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*
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* @param totalSeconds the total time-zone offset in seconds, from -64800 to +64800
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*/
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private ZoneOffset(int totalSeconds) {
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super();
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this.totalSeconds = totalSeconds;
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id = buildId(totalSeconds);
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}
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private static String buildId(int totalSeconds) {
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if (totalSeconds == 0) {
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return "Z";
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} else {
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int absTotalSeconds = Math.abs(totalSeconds);
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StringBuilder buf = new StringBuilder();
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int absHours = absTotalSeconds / SECONDS_PER_HOUR;
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int absMinutes = (absTotalSeconds / SECONDS_PER_MINUTE) % MINUTES_PER_HOUR;
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buf.append(totalSeconds < 0 ? "-" : "+")
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.append(absHours < 10 ? "0" : "").append(absHours)
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.append(absMinutes < 10 ? ":0" : ":").append(absMinutes);
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int absSeconds = absTotalSeconds % SECONDS_PER_MINUTE;
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if (absSeconds != 0) {
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buf.append(absSeconds < 10 ? ":0" : ":").append(absSeconds);
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}
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return buf.toString();
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}
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}
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/**
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* Gets the total zone offset in seconds.
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* <p>
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* This is the primary way to access the offset amount.
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* It returns the total of the hours, minutes and seconds fields as a
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* single offset that can be added to a time.
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*
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* @return the total zone offset amount in seconds
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*/
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public int getTotalSeconds() {
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return totalSeconds;
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}
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/**
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* Gets the normalized zone offset ID.
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* <p>
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* The ID is minor variation to the standard ISO-8601 formatted string
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* for the offset. There are three formats:
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* <p><ul>
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* <li>{@code Z} - for UTC (ISO-8601)
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* <li>{@code +hh:mm} or {@code -hh:mm} - if the seconds are zero (ISO-8601)
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* <li>{@code +hh:mm:ss} or {@code -hh:mm:ss} - if the seconds are non-zero (not ISO-8601)
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* </ul><p>
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*
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* @return the zone offset ID, not null
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*/
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public String getId() {
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return id;
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}
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/**
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* Compares this offset to another offset in descending order.
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* <p>
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* The offsets are compared in the order that they occur for the same time
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* of day around the world. Thus, an offset of {@code +10:00} comes before an
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* offset of {@code +09:00} and so on down to {@code -18:00}.
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* <p>
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* The comparison is "consistent with equals", as defined by {@link Comparable}.
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*
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* @param other the other date to compare to, not null
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* @return the comparator value, negative if less, postive if greater
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* @throws NullPointerException if {@code other} is null
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*/
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@Override
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public int compareTo(ZoneOffset other) {
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return other.totalSeconds - totalSeconds;
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}
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/**
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* Checks if this offset is equal to another offset.
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* <p>
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* The comparison is based on the amount of the offset in seconds.
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* This is equivalent to a comparison by ID.
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*
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* @param obj the object to check, null returns false
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* @return true if this is equal to the other offset
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*/
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj instanceof ZoneOffset) {
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return totalSeconds == ((ZoneOffset) obj).totalSeconds;
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}
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return false;
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}
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/**
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* A hash code for this offset.
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*
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* @return a suitable hash code
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*/
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@Override
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public int hashCode() {
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return totalSeconds;
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}
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/**
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* Outputs this offset as a {@code String}, using the normalized ID.
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*
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* @return a string representation of this offset, not null
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*/
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@Override
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public String toString() {
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return id;
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}
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}
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