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/*
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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 java.time;
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import java.time.temporal.UnsupportedTemporalTypeException;
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import static java.time.LocalTime.MINUTES_PER_HOUR;
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import static java.time.LocalTime.SECONDS_PER_HOUR;
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import static java.time.LocalTime.SECONDS_PER_MINUTE;
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import static java.time.temporal.ChronoField.OFFSET_SECONDS;
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import java.io.DataInput;
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import java.io.DataOutput;
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import java.io.IOException;
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import java.io.InvalidObjectException;
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import java.io.ObjectStreamException;
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import java.io.Serializable;
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import java.time.temporal.ChronoField;
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import java.time.temporal.Temporal;
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import java.time.temporal.TemporalAccessor;
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import java.time.temporal.TemporalAdjuster;
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import java.time.temporal.TemporalField;
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import java.time.temporal.TemporalQuery;
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import java.time.temporal.ValueRange;
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import java.time.zone.ZoneRules;
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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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* <p>
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* Different parts of the world have different time-zone offsets.
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* The rules for how offsets vary by place and time of year are captured in the
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* {@link ZoneId} class.
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* <p>
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* For example, Paris is one hour ahead of Greenwich/UTC in winter and two hours
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* ahead in summer. The {@code ZoneId} instance for Paris will reference two
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* {@code ZoneOffset} instances - a {@code +01:00} instance for winter,
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* and a {@code +02:00} instance for summer.
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* <p>
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* In 2008, time-zone offsets around the world extended from -12:00 to +14:00.
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* To prevent any problems with that range being extended, yet still provide
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* validation, the range of offsets is restricted to -18:00 to 18:00 inclusive.
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* <p>
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* This class is designed for use with the ISO calendar system.
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* The fields of hours, minutes and seconds make assumptions that are valid for the
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* standard ISO definitions of those fields. This class may be used with other
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* calendar systems providing the definition of the time fields matches those
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* of the ISO calendar system.
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* <p>
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* Instances of {@code ZoneOffset} must be compared using {@link #equals}.
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* Implementations may choose to cache certain common offsets, however
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* applications must not rely on such caching.
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*
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* <h3>Specification for implementors</h3>
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* This class is immutable and thread-safe.
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*
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* @since 1.8
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*/
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public final class ZoneOffset
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extends ZoneId
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implements TemporalAccessor, TemporalAdjuster, Comparable<ZoneOffset>, Serializable {
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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 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("Invalid ID for ZoneOffset, invalid format: " + offsetId);
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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("Invalid ID for ZoneOffset, plus/minus not found when expected: " + offsetId);
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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("Invalid ID for ZoneOffset, colon not found when expected: " + offsetId);
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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("Invalid ID for ZoneOffset, non numeric characters found: " + offsetId);
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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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/**
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* Obtains an instance of {@code ZoneOffset} from a temporal object.
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* <p>
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* This obtains an offset based on the specified temporal.
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* A {@code TemporalAccessor} represents an arbitrary set of date and time information,
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* which this factory converts to an instance of {@code ZoneOffset}.
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* <p>
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* A {@code TemporalAccessor} represents some form of date and time information.
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* This factory converts the arbitrary temporal object to an instance of {@code ZoneOffset}.
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* <p>
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* The conversion uses the {@link TemporalQuery#offset()} query, which relies
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* on extracting the {@link ChronoField#OFFSET_SECONDS OFFSET_SECONDS} field.
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* <p>
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* This method matches the signature of the functional interface {@link TemporalQuery}
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* allowing it to be used in queries via method reference, {@code ZoneOffset::from}.
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*
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* @param temporal the temporal object to convert, not null
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* @return the zone-offset, not null
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* @throws DateTimeException if unable to convert to an {@code ZoneOffset}
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*/
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public static ZoneOffset from(TemporalAccessor temporal) {
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ZoneOffset offset = temporal.query(TemporalQuery.offset());
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if (offset == null) {
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throw new DateTimeException("Unable to obtain ZoneOffset from TemporalAccessor: " + temporal.getClass());
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}
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return offset;
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}
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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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372 |
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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|
376 |
if (Math.abs(hours) == 18 && (Math.abs(minutes) > 0 || Math.abs(seconds) > 0)) {
|
|
377 |
throw new DateTimeException("Zone offset not in valid range: -18:00 to +18:00");
|
|
378 |
}
|
|
379 |
}
|
|
380 |
|
|
381 |
/**
|
|
382 |
* Calculates the total offset in seconds.
|
|
383 |
*
|
|
384 |
* @param hours the time-zone offset in hours, from -18 to +18
|
|
385 |
* @param minutes the time-zone offset in minutes, from 0 to ±59, sign matches hours and seconds
|
|
386 |
* @param seconds the time-zone offset in seconds, from 0 to ±59, sign matches hours and minutes
|
|
387 |
* @return the total in seconds
|
|
388 |
*/
|
|
389 |
private static int totalSeconds(int hours, int minutes, int seconds) {
|
|
390 |
return hours * SECONDS_PER_HOUR + minutes * SECONDS_PER_MINUTE + seconds;
|
|
391 |
}
|
|
392 |
|
|
393 |
//-----------------------------------------------------------------------
|
|
394 |
/**
|
|
395 |
* Obtains an instance of {@code ZoneOffset} specifying the total offset in seconds
|
|
396 |
* <p>
|
|
397 |
* The offset must be in the range {@code -18:00} to {@code +18:00}, which corresponds to -64800 to +64800.
|
|
398 |
*
|
|
399 |
* @param totalSeconds the total time-zone offset in seconds, from -64800 to +64800
|
|
400 |
* @return the ZoneOffset, not null
|
|
401 |
* @throws DateTimeException if the offset is not in the required range
|
|
402 |
*/
|
|
403 |
public static ZoneOffset ofTotalSeconds(int totalSeconds) {
|
|
404 |
if (Math.abs(totalSeconds) > MAX_SECONDS) {
|
|
405 |
throw new DateTimeException("Zone offset not in valid range: -18:00 to +18:00");
|
|
406 |
}
|
|
407 |
if (totalSeconds % (15 * SECONDS_PER_MINUTE) == 0) {
|
|
408 |
Integer totalSecs = totalSeconds;
|
|
409 |
ZoneOffset result = SECONDS_CACHE.get(totalSecs);
|
|
410 |
if (result == null) {
|
|
411 |
result = new ZoneOffset(totalSeconds);
|
|
412 |
SECONDS_CACHE.putIfAbsent(totalSecs, result);
|
|
413 |
result = SECONDS_CACHE.get(totalSecs);
|
|
414 |
ID_CACHE.putIfAbsent(result.getId(), result);
|
|
415 |
}
|
|
416 |
return result;
|
|
417 |
} else {
|
|
418 |
return new ZoneOffset(totalSeconds);
|
|
419 |
}
|
|
420 |
}
|
|
421 |
|
|
422 |
//-----------------------------------------------------------------------
|
|
423 |
/**
|
|
424 |
* Constructor.
|
|
425 |
*
|
|
426 |
* @param totalSeconds the total time-zone offset in seconds, from -64800 to +64800
|
|
427 |
*/
|
|
428 |
private ZoneOffset(int totalSeconds) {
|
|
429 |
super();
|
|
430 |
this.totalSeconds = totalSeconds;
|
|
431 |
id = buildId(totalSeconds);
|
|
432 |
}
|
|
433 |
|
|
434 |
private static String buildId(int totalSeconds) {
|
|
435 |
if (totalSeconds == 0) {
|
|
436 |
return "Z";
|
|
437 |
} else {
|
|
438 |
int absTotalSeconds = Math.abs(totalSeconds);
|
|
439 |
StringBuilder buf = new StringBuilder();
|
|
440 |
int absHours = absTotalSeconds / SECONDS_PER_HOUR;
|
|
441 |
int absMinutes = (absTotalSeconds / SECONDS_PER_MINUTE) % MINUTES_PER_HOUR;
|
|
442 |
buf.append(totalSeconds < 0 ? "-" : "+")
|
|
443 |
.append(absHours < 10 ? "0" : "").append(absHours)
|
|
444 |
.append(absMinutes < 10 ? ":0" : ":").append(absMinutes);
|
|
445 |
int absSeconds = absTotalSeconds % SECONDS_PER_MINUTE;
|
|
446 |
if (absSeconds != 0) {
|
|
447 |
buf.append(absSeconds < 10 ? ":0" : ":").append(absSeconds);
|
|
448 |
}
|
|
449 |
return buf.toString();
|
|
450 |
}
|
|
451 |
}
|
|
452 |
|
|
453 |
//-----------------------------------------------------------------------
|
|
454 |
/**
|
|
455 |
* Gets the total zone offset in seconds.
|
|
456 |
* <p>
|
|
457 |
* This is the primary way to access the offset amount.
|
|
458 |
* It returns the total of the hours, minutes and seconds fields as a
|
|
459 |
* single offset that can be added to a time.
|
|
460 |
*
|
|
461 |
* @return the total zone offset amount in seconds
|
|
462 |
*/
|
|
463 |
public int getTotalSeconds() {
|
|
464 |
return totalSeconds;
|
|
465 |
}
|
|
466 |
|
|
467 |
/**
|
|
468 |
* Gets the normalized zone offset ID.
|
|
469 |
* <p>
|
|
470 |
* The ID is minor variation to the standard ISO-8601 formatted string
|
|
471 |
* for the offset. There are three formats:
|
|
472 |
* <p><ul>
|
|
473 |
* <li>{@code Z} - for UTC (ISO-8601)
|
|
474 |
* <li>{@code +hh:mm} or {@code -hh:mm} - if the seconds are zero (ISO-8601)
|
|
475 |
* <li>{@code +hh:mm:ss} or {@code -hh:mm:ss} - if the seconds are non-zero (not ISO-8601)
|
|
476 |
* </ul><p>
|
|
477 |
*
|
|
478 |
* @return the zone offset ID, not null
|
|
479 |
*/
|
|
480 |
@Override
|
|
481 |
public String getId() {
|
|
482 |
return id;
|
|
483 |
}
|
|
484 |
|
|
485 |
/**
|
|
486 |
* Gets the associated time-zone rules.
|
|
487 |
* <p>
|
|
488 |
* The rules will always return this offset when queried.
|
|
489 |
* The implementation class is immutable, thread-safe and serializable.
|
|
490 |
*
|
|
491 |
* @return the rules, not null
|
|
492 |
*/
|
|
493 |
@Override
|
|
494 |
public ZoneRules getRules() {
|
|
495 |
return ZoneRules.of(this);
|
|
496 |
}
|
|
497 |
|
|
498 |
//-----------------------------------------------------------------------
|
|
499 |
/**
|
|
500 |
* Checks if the specified field is supported.
|
|
501 |
* <p>
|
|
502 |
* This checks if this offset can be queried for the specified field.
|
|
503 |
* If false, then calling the {@link #range(TemporalField) range} and
|
|
504 |
* {@link #get(TemporalField) get} methods will throw an exception.
|
|
505 |
* <p>
|
|
506 |
* If the field is a {@link ChronoField} then the query is implemented here.
|
|
507 |
* The {@code OFFSET_SECONDS} field returns true.
|
|
508 |
* All other {@code ChronoField} instances will return false.
|
|
509 |
* <p>
|
|
510 |
* If the field is not a {@code ChronoField}, then the result of this method
|
15658
|
511 |
* is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
|
15289
|
512 |
* passing {@code this} as the argument.
|
|
513 |
* Whether the field is supported is determined by the field.
|
|
514 |
*
|
|
515 |
* @param field the field to check, null returns false
|
|
516 |
* @return true if the field is supported on this offset, false if not
|
|
517 |
*/
|
|
518 |
@Override
|
|
519 |
public boolean isSupported(TemporalField field) {
|
|
520 |
if (field instanceof ChronoField) {
|
|
521 |
return field == OFFSET_SECONDS;
|
|
522 |
}
|
15658
|
523 |
return field != null && field.isSupportedBy(this);
|
15289
|
524 |
}
|
|
525 |
|
|
526 |
/**
|
|
527 |
* Gets the range of valid values for the specified field.
|
|
528 |
* <p>
|
|
529 |
* The range object expresses the minimum and maximum valid values for a field.
|
|
530 |
* This offset is used to enhance the accuracy of the returned range.
|
|
531 |
* If it is not possible to return the range, because the field is not supported
|
|
532 |
* or for some other reason, an exception is thrown.
|
|
533 |
* <p>
|
|
534 |
* If the field is a {@link ChronoField} then the query is implemented here.
|
|
535 |
* The {@link #isSupported(TemporalField) supported fields} will return
|
|
536 |
* appropriate range instances.
|
16852
|
537 |
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
|
15289
|
538 |
* <p>
|
|
539 |
* If the field is not a {@code ChronoField}, then the result of this method
|
15658
|
540 |
* is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
|
15289
|
541 |
* passing {@code this} as the argument.
|
|
542 |
* Whether the range can be obtained is determined by the field.
|
|
543 |
*
|
|
544 |
* @param field the field to query the range for, not null
|
|
545 |
* @return the range of valid values for the field, not null
|
|
546 |
* @throws DateTimeException if the range for the field cannot be obtained
|
16852
|
547 |
* @throws UnsupportedTemporalTypeException if the field is not supported
|
15289
|
548 |
*/
|
|
549 |
@Override // override for Javadoc
|
|
550 |
public ValueRange range(TemporalField field) {
|
|
551 |
return TemporalAccessor.super.range(field);
|
|
552 |
}
|
|
553 |
|
|
554 |
/**
|
|
555 |
* Gets the value of the specified field from this offset as an {@code int}.
|
|
556 |
* <p>
|
|
557 |
* This queries this offset for the value for the specified field.
|
|
558 |
* The returned value will always be within the valid range of values for the field.
|
|
559 |
* If it is not possible to return the value, because the field is not supported
|
|
560 |
* or for some other reason, an exception is thrown.
|
|
561 |
* <p>
|
|
562 |
* If the field is a {@link ChronoField} then the query is implemented here.
|
|
563 |
* The {@code OFFSET_SECONDS} field returns the value of the offset.
|
16852
|
564 |
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
|
15289
|
565 |
* <p>
|
|
566 |
* If the field is not a {@code ChronoField}, then the result of this method
|
15658
|
567 |
* is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
|
15289
|
568 |
* passing {@code this} as the argument. Whether the value can be obtained,
|
|
569 |
* and what the value represents, is determined by the field.
|
|
570 |
*
|
|
571 |
* @param field the field to get, not null
|
|
572 |
* @return the value for the field
|
16852
|
573 |
* @throws DateTimeException if a value for the field cannot be obtained or
|
|
574 |
* the value is outside the range of valid values for the field
|
|
575 |
* @throws UnsupportedTemporalTypeException if the field is not supported or
|
|
576 |
* the range of values exceeds an {@code int}
|
15289
|
577 |
* @throws ArithmeticException if numeric overflow occurs
|
|
578 |
*/
|
|
579 |
@Override // override for Javadoc and performance
|
|
580 |
public int get(TemporalField field) {
|
|
581 |
if (field == OFFSET_SECONDS) {
|
|
582 |
return totalSeconds;
|
|
583 |
} else if (field instanceof ChronoField) {
|
16852
|
584 |
throw new UnsupportedTemporalTypeException("Unsupported field: " + field.getName());
|
15289
|
585 |
}
|
|
586 |
return range(field).checkValidIntValue(getLong(field), field);
|
|
587 |
}
|
|
588 |
|
|
589 |
/**
|
|
590 |
* Gets the value of the specified field from this offset as a {@code long}.
|
|
591 |
* <p>
|
|
592 |
* This queries this offset for the value for the specified field.
|
|
593 |
* If it is not possible to return the value, because the field is not supported
|
|
594 |
* or for some other reason, an exception is thrown.
|
|
595 |
* <p>
|
|
596 |
* If the field is a {@link ChronoField} then the query is implemented here.
|
|
597 |
* The {@code OFFSET_SECONDS} field returns the value of the offset.
|
16852
|
598 |
* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
|
15289
|
599 |
* <p>
|
|
600 |
* If the field is not a {@code ChronoField}, then the result of this method
|
15658
|
601 |
* is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
|
15289
|
602 |
* passing {@code this} as the argument. Whether the value can be obtained,
|
|
603 |
* and what the value represents, is determined by the field.
|
|
604 |
*
|
|
605 |
* @param field the field to get, not null
|
|
606 |
* @return the value for the field
|
|
607 |
* @throws DateTimeException if a value for the field cannot be obtained
|
16852
|
608 |
* @throws UnsupportedTemporalTypeException if the field is not supported
|
15289
|
609 |
* @throws ArithmeticException if numeric overflow occurs
|
|
610 |
*/
|
|
611 |
@Override
|
|
612 |
public long getLong(TemporalField field) {
|
|
613 |
if (field == OFFSET_SECONDS) {
|
|
614 |
return totalSeconds;
|
|
615 |
} else if (field instanceof ChronoField) {
|
16852
|
616 |
throw new UnsupportedTemporalTypeException("Unsupported field: " + field.getName());
|
15289
|
617 |
}
|
15658
|
618 |
return field.getFrom(this);
|
15289
|
619 |
}
|
|
620 |
|
|
621 |
//-----------------------------------------------------------------------
|
|
622 |
/**
|
|
623 |
* Queries this offset using the specified query.
|
|
624 |
* <p>
|
|
625 |
* This queries this offset using the specified query strategy object.
|
|
626 |
* The {@code TemporalQuery} object defines the logic to be used to
|
|
627 |
* obtain the result. Read the documentation of the query to understand
|
|
628 |
* what the result of this method will be.
|
|
629 |
* <p>
|
|
630 |
* The result of this method is obtained by invoking the
|
|
631 |
* {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
|
|
632 |
* specified query passing {@code this} as the argument.
|
|
633 |
*
|
|
634 |
* @param <R> the type of the result
|
|
635 |
* @param query the query to invoke, not null
|
|
636 |
* @return the query result, null may be returned (defined by the query)
|
|
637 |
* @throws DateTimeException if unable to query (defined by the query)
|
|
638 |
* @throws ArithmeticException if numeric overflow occurs (defined by the query)
|
|
639 |
*/
|
|
640 |
@SuppressWarnings("unchecked")
|
|
641 |
@Override
|
|
642 |
public <R> R query(TemporalQuery<R> query) {
|
16852
|
643 |
if (query == TemporalQuery.offset() || query == TemporalQuery.zone()) {
|
15289
|
644 |
return (R) this;
|
|
645 |
}
|
|
646 |
return TemporalAccessor.super.query(query);
|
|
647 |
}
|
|
648 |
|
|
649 |
/**
|
|
650 |
* Adjusts the specified temporal object to have the same offset as this object.
|
|
651 |
* <p>
|
|
652 |
* This returns a temporal object of the same observable type as the input
|
|
653 |
* with the offset changed to be the same as this.
|
|
654 |
* <p>
|
|
655 |
* The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
|
|
656 |
* passing {@link ChronoField#OFFSET_SECONDS} as the field.
|
|
657 |
* <p>
|
|
658 |
* In most cases, it is clearer to reverse the calling pattern by using
|
|
659 |
* {@link Temporal#with(TemporalAdjuster)}:
|
|
660 |
* <pre>
|
|
661 |
* // these two lines are equivalent, but the second approach is recommended
|
|
662 |
* temporal = thisOffset.adjustInto(temporal);
|
|
663 |
* temporal = temporal.with(thisOffset);
|
|
664 |
* </pre>
|
|
665 |
* <p>
|
|
666 |
* This instance is immutable and unaffected by this method call.
|
|
667 |
*
|
|
668 |
* @param temporal the target object to be adjusted, not null
|
|
669 |
* @return the adjusted object, not null
|
|
670 |
* @throws DateTimeException if unable to make the adjustment
|
|
671 |
* @throws ArithmeticException if numeric overflow occurs
|
|
672 |
*/
|
|
673 |
@Override
|
|
674 |
public Temporal adjustInto(Temporal temporal) {
|
|
675 |
return temporal.with(OFFSET_SECONDS, totalSeconds);
|
|
676 |
}
|
|
677 |
|
|
678 |
//-----------------------------------------------------------------------
|
|
679 |
/**
|
|
680 |
* Compares this offset to another offset in descending order.
|
|
681 |
* <p>
|
|
682 |
* The offsets are compared in the order that they occur for the same time
|
|
683 |
* of day around the world. Thus, an offset of {@code +10:00} comes before an
|
|
684 |
* offset of {@code +09:00} and so on down to {@code -18:00}.
|
|
685 |
* <p>
|
|
686 |
* The comparison is "consistent with equals", as defined by {@link Comparable}.
|
|
687 |
*
|
|
688 |
* @param other the other date to compare to, not null
|
|
689 |
* @return the comparator value, negative if less, postive if greater
|
|
690 |
* @throws NullPointerException if {@code other} is null
|
|
691 |
*/
|
|
692 |
@Override
|
|
693 |
public int compareTo(ZoneOffset other) {
|
|
694 |
return other.totalSeconds - totalSeconds;
|
|
695 |
}
|
|
696 |
|
|
697 |
//-----------------------------------------------------------------------
|
|
698 |
/**
|
|
699 |
* Checks if this offset is equal to another offset.
|
|
700 |
* <p>
|
|
701 |
* The comparison is based on the amount of the offset in seconds.
|
|
702 |
* This is equivalent to a comparison by ID.
|
|
703 |
*
|
|
704 |
* @param obj the object to check, null returns false
|
|
705 |
* @return true if this is equal to the other offset
|
|
706 |
*/
|
|
707 |
@Override
|
|
708 |
public boolean equals(Object obj) {
|
|
709 |
if (this == obj) {
|
|
710 |
return true;
|
|
711 |
}
|
|
712 |
if (obj instanceof ZoneOffset) {
|
|
713 |
return totalSeconds == ((ZoneOffset) obj).totalSeconds;
|
|
714 |
}
|
|
715 |
return false;
|
|
716 |
}
|
|
717 |
|
|
718 |
/**
|
|
719 |
* A hash code for this offset.
|
|
720 |
*
|
|
721 |
* @return a suitable hash code
|
|
722 |
*/
|
|
723 |
@Override
|
|
724 |
public int hashCode() {
|
|
725 |
return totalSeconds;
|
|
726 |
}
|
|
727 |
|
|
728 |
//-----------------------------------------------------------------------
|
|
729 |
/**
|
|
730 |
* Outputs this offset as a {@code String}, using the normalized ID.
|
|
731 |
*
|
|
732 |
* @return a string representation of this offset, not null
|
|
733 |
*/
|
|
734 |
@Override
|
|
735 |
public String toString() {
|
|
736 |
return id;
|
|
737 |
}
|
|
738 |
|
|
739 |
// -----------------------------------------------------------------------
|
|
740 |
/**
|
|
741 |
* Writes the object using a
|
|
742 |
* <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
|
|
743 |
* <pre>
|
|
744 |
* out.writeByte(8); // identifies this as a ZoneOffset
|
|
745 |
* int offsetByte = totalSeconds % 900 == 0 ? totalSeconds / 900 : 127;
|
|
746 |
* out.writeByte(offsetByte);
|
|
747 |
* if (offsetByte == 127) {
|
|
748 |
* out.writeInt(totalSeconds);
|
|
749 |
* }
|
|
750 |
* </pre>
|
|
751 |
*
|
|
752 |
* @return the instance of {@code Ser}, not null
|
|
753 |
*/
|
|
754 |
private Object writeReplace() {
|
|
755 |
return new Ser(Ser.ZONE_OFFSET_TYPE, this);
|
|
756 |
}
|
|
757 |
|
|
758 |
/**
|
|
759 |
* Defend against malicious streams.
|
|
760 |
* @return never
|
|
761 |
* @throws InvalidObjectException always
|
|
762 |
*/
|
|
763 |
private Object readResolve() throws ObjectStreamException {
|
|
764 |
throw new InvalidObjectException("Deserialization via serialization delegate");
|
|
765 |
}
|
|
766 |
|
|
767 |
@Override
|
|
768 |
void write(DataOutput out) throws IOException {
|
|
769 |
out.writeByte(Ser.ZONE_OFFSET_TYPE);
|
|
770 |
writeExternal(out);
|
|
771 |
}
|
|
772 |
|
|
773 |
void writeExternal(DataOutput out) throws IOException {
|
|
774 |
final int offsetSecs = totalSeconds;
|
|
775 |
int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127; // compress to -72 to +72
|
|
776 |
out.writeByte(offsetByte);
|
|
777 |
if (offsetByte == 127) {
|
|
778 |
out.writeInt(offsetSecs);
|
|
779 |
}
|
|
780 |
}
|
|
781 |
|
|
782 |
static ZoneOffset readExternal(DataInput in) throws IOException {
|
|
783 |
int offsetByte = in.readByte();
|
|
784 |
return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));
|
|
785 |
}
|
|
786 |
|
|
787 |
}
|