author | rriggs |
Tue, 22 Oct 2013 15:03:12 -0400 | |
changeset 21331 | 8ee181e7e48b |
parent 19841 | 15c8e97d6a14 |
child 22081 | 86eb26ff8f2b |
permissions | -rw-r--r-- |
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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) 2009-2012, 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.zone; |
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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.Serializable; |
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import java.time.Duration; |
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import java.time.Instant; |
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import java.time.LocalDateTime; |
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import java.time.ZoneOffset; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.Objects; |
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/** |
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* A transition between two offsets caused by a discontinuity in the local time-line. |
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* <p> |
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* A transition between two offsets is normally the result of a daylight savings cutover. |
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* The discontinuity is normally a gap in spring and an overlap in autumn. |
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* {@code ZoneOffsetTransition} models the transition between the two offsets. |
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* <p> |
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* Gaps occur where there are local date-times that simply do not not exist. |
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* An example would be when the offset changes from {@code +03:00} to {@code +04:00}. |
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* This might be described as 'the clocks will move forward one hour tonight at 1am'. |
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* <p> |
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* Overlaps occur where there are local date-times that exist twice. |
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* An example would be when the offset changes from {@code +04:00} to {@code +03:00}. |
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* This might be described as 'the clocks will move back one hour tonight at 2am'. |
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* |
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* @implSpec |
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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 ZoneOffsetTransition |
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implements Comparable<ZoneOffsetTransition>, Serializable { |
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/** |
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* Serialization version. |
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*/ |
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private static final long serialVersionUID = -6946044323557704546L; |
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/** |
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* The local transition date-time at the transition. |
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*/ |
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private final LocalDateTime transition; |
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/** |
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* The offset before transition. |
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*/ |
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private final ZoneOffset offsetBefore; |
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/** |
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* The offset after transition. |
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*/ |
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private final ZoneOffset offsetAfter; |
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//----------------------------------------------------------------------- |
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/** |
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* Obtains an instance defining a transition between two offsets. |
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* <p> |
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* Applications should normally obtain an instance from {@link ZoneRules}. |
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* This factory is only intended for use when creating {@link ZoneRules}. |
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* |
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* @param transition the transition date-time at the transition, which never |
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* actually occurs, expressed local to the before offset, not null |
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* @param offsetBefore the offset before the transition, not null |
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* @param offsetAfter the offset at and after the transition, not null |
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* @return the transition, not null |
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* @throws IllegalArgumentException if {@code offsetBefore} and {@code offsetAfter} |
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* are equal, or {@code transition.getNano()} returns non-zero value |
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*/ |
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public static ZoneOffsetTransition of(LocalDateTime transition, ZoneOffset offsetBefore, ZoneOffset offsetAfter) { |
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Objects.requireNonNull(transition, "transition"); |
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Objects.requireNonNull(offsetBefore, "offsetBefore"); |
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Objects.requireNonNull(offsetAfter, "offsetAfter"); |
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if (offsetBefore.equals(offsetAfter)) { |
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throw new IllegalArgumentException("Offsets must not be equal"); |
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} |
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if (transition.getNano() != 0) { |
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throw new IllegalArgumentException("Nano-of-second must be zero"); |
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} |
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return new ZoneOffsetTransition(transition, offsetBefore, offsetAfter); |
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} |
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/** |
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* Creates an instance defining a transition between two offsets. |
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* |
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* @param transition the transition date-time with the offset before the transition, not null |
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* @param offsetBefore the offset before the transition, not null |
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* @param offsetAfter the offset at and after the transition, not null |
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*/ |
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ZoneOffsetTransition(LocalDateTime transition, ZoneOffset offsetBefore, ZoneOffset offsetAfter) { |
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this.transition = transition; |
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this.offsetBefore = offsetBefore; |
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this.offsetAfter = offsetAfter; |
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} |
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/** |
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* Creates an instance from epoch-second and offsets. |
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* |
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* @param epochSecond the transition epoch-second |
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* @param offsetBefore the offset before the transition, not null |
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* @param offsetAfter the offset at and after the transition, not null |
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*/ |
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ZoneOffsetTransition(long epochSecond, ZoneOffset offsetBefore, ZoneOffset offsetAfter) { |
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this.transition = LocalDateTime.ofEpochSecond(epochSecond, 0, offsetBefore); |
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this.offsetBefore = offsetBefore; |
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this.offsetAfter = offsetAfter; |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Defend against malicious streams. |
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* @return never |
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* @throws InvalidObjectException always |
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*/ |
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private Object readResolve() throws InvalidObjectException { |
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throw new InvalidObjectException("Deserialization via serialization delegate"); |
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} |
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/** |
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* Writes the object using a |
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* <a href="../../../serialized-form.html#java.time.zone.Ser">dedicated serialized form</a>. |
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* @serialData |
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* Refer to the serialized form of |
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* <a href="../../../serialized-form.html#java.time.zone.ZoneRules">ZoneRules.writeReplace</a> |
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* for the encoding of epoch seconds and offsets. |
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* <pre style="font-size:1.0em">{@code |
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* |
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* out.writeByte(2); // identifies a ZoneOffsetTransition |
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* out.writeEpochSec(toEpochSecond); |
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* out.writeOffset(offsetBefore); |
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* out.writeOffset(offsetAfter); |
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* } |
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* </pre> |
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* @return the replacing object, not null |
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*/ |
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private Object writeReplace() { |
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return new Ser(Ser.ZOT, this); |
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} |
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/** |
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* Writes the state to the stream. |
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* |
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* @param out the output stream, not null |
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* @throws IOException if an error occurs |
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*/ |
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void writeExternal(DataOutput out) throws IOException { |
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Ser.writeEpochSec(toEpochSecond(), out); |
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Ser.writeOffset(offsetBefore, out); |
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Ser.writeOffset(offsetAfter, out); |
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} |
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/** |
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* Reads the state from the stream. |
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* |
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* @param in the input stream, not null |
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* @return the created object, not null |
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* @throws IOException if an error occurs |
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*/ |
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static ZoneOffsetTransition readExternal(DataInput in) throws IOException { |
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long epochSecond = Ser.readEpochSec(in); |
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ZoneOffset before = Ser.readOffset(in); |
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ZoneOffset after = Ser.readOffset(in); |
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if (before.equals(after)) { |
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throw new IllegalArgumentException("Offsets must not be equal"); |
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} |
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return new ZoneOffsetTransition(epochSecond, before, after); |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Gets the transition instant. |
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* <p> |
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* This is the instant of the discontinuity, which is defined as the first |
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* instant that the 'after' offset applies. |
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* <p> |
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* The methods {@link #getInstant()}, {@link #getDateTimeBefore()} and {@link #getDateTimeAfter()} |
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* all represent the same instant. |
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* |
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* @return the transition instant, not null |
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*/ |
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public Instant getInstant() { |
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return transition.toInstant(offsetBefore); |
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} |
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/** |
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* Gets the transition instant as an epoch second. |
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* |
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* @return the transition epoch second |
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*/ |
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public long toEpochSecond() { |
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return transition.toEpochSecond(offsetBefore); |
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} |
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//------------------------------------------------------------------------- |
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/** |
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* Gets the local transition date-time, as would be expressed with the 'before' offset. |
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* <p> |
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* This is the date-time where the discontinuity begins expressed with the 'before' offset. |
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* At this instant, the 'after' offset is actually used, therefore the combination of this |
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* date-time and the 'before' offset will never occur. |
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* <p> |
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* The combination of the 'before' date-time and offset represents the same instant |
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* as the 'after' date-time and offset. |
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* |
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* @return the transition date-time expressed with the before offset, not null |
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*/ |
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public LocalDateTime getDateTimeBefore() { |
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return transition; |
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} |
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/** |
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* Gets the local transition date-time, as would be expressed with the 'after' offset. |
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* <p> |
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* This is the first date-time after the discontinuity, when the new offset applies. |
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* <p> |
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* The combination of the 'before' date-time and offset represents the same instant |
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* as the 'after' date-time and offset. |
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* |
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* @return the transition date-time expressed with the after offset, not null |
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*/ |
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public LocalDateTime getDateTimeAfter() { |
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return transition.plusSeconds(getDurationSeconds()); |
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} |
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/** |
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* Gets the offset before the transition. |
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* <p> |
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* This is the offset in use before the instant of the transition. |
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* |
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* @return the offset before the transition, not null |
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*/ |
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public ZoneOffset getOffsetBefore() { |
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return offsetBefore; |
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} |
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/** |
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* Gets the offset after the transition. |
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* <p> |
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* This is the offset in use on and after the instant of the transition. |
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* |
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* @return the offset after the transition, not null |
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*/ |
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public ZoneOffset getOffsetAfter() { |
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return offsetAfter; |
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} |
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/** |
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* Gets the duration of the transition. |
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* <p> |
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* In most cases, the transition duration is one hour, however this is not always the case. |
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* The duration will be positive for a gap and negative for an overlap. |
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* Time-zones are second-based, so the nanosecond part of the duration will be zero. |
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* |
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* @return the duration of the transition, positive for gaps, negative for overlaps |
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*/ |
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public Duration getDuration() { |
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return Duration.ofSeconds(getDurationSeconds()); |
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} |
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/** |
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* Gets the duration of the transition in seconds. |
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* |
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* @return the duration in seconds |
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*/ |
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private int getDurationSeconds() { |
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return getOffsetAfter().getTotalSeconds() - getOffsetBefore().getTotalSeconds(); |
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} |
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/** |
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* Does this transition represent a gap in the local time-line. |
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* <p> |
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* Gaps occur where there are local date-times that simply do not not exist. |
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* An example would be when the offset changes from {@code +01:00} to {@code +02:00}. |
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* This might be described as 'the clocks will move forward one hour tonight at 1am'. |
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* |
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* @return true if this transition is a gap, false if it is an overlap |
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*/ |
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public boolean isGap() { |
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return getOffsetAfter().getTotalSeconds() > getOffsetBefore().getTotalSeconds(); |
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} |
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/** |
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* Does this transition represent an overlap in the local time-line. |
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* <p> |
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* Overlaps occur where there are local date-times that exist twice. |
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* An example would be when the offset changes from {@code +02:00} to {@code +01:00}. |
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* This might be described as 'the clocks will move back one hour tonight at 2am'. |
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* |
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* @return true if this transition is an overlap, false if it is a gap |
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*/ |
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public boolean isOverlap() { |
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return getOffsetAfter().getTotalSeconds() < getOffsetBefore().getTotalSeconds(); |
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} |
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/** |
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* Checks if the specified offset is valid during this transition. |
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* <p> |
|
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* This checks to see if the given offset will be valid at some point in the transition. |
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* A gap will always return false. |
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* An overlap will return true if the offset is either the before or after offset. |
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* |
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* @param offset the offset to check, null returns false |
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* @return true if the offset is valid during the transition |
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*/ |
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public boolean isValidOffset(ZoneOffset offset) { |
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return isGap() ? false : (getOffsetBefore().equals(offset) || getOffsetAfter().equals(offset)); |
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} |
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/** |
|
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* Gets the valid offsets during this transition. |
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* <p> |
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* A gap will return an empty list, while an overlap will return both offsets. |
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* |
|
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* @return the list of valid offsets |
|
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*/ |
|
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List<ZoneOffset> getValidOffsets() { |
|
380 |
if (isGap()) { |
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return Collections.emptyList(); |
|
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} |
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return Arrays.asList(getOffsetBefore(), getOffsetAfter()); |
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} |
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//----------------------------------------------------------------------- |
|
387 |
/** |
|
388 |
* Compares this transition to another based on the transition instant. |
|
389 |
* <p> |
|
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* This compares the instants of each transition. |
|
391 |
* The offsets are ignored, making this order inconsistent with equals. |
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* |
|
393 |
* @param transition the transition to compare to, not null |
|
394 |
* @return the comparator value, negative if less, positive if greater |
|
395 |
*/ |
|
396 |
@Override |
|
397 |
public int compareTo(ZoneOffsetTransition transition) { |
|
398 |
return this.getInstant().compareTo(transition.getInstant()); |
|
399 |
} |
|
400 |
||
401 |
//----------------------------------------------------------------------- |
|
402 |
/** |
|
403 |
* Checks if this object equals another. |
|
404 |
* <p> |
|
405 |
* The entire state of the object is compared. |
|
406 |
* |
|
407 |
* @param other the other object to compare to, null returns false |
|
408 |
* @return true if equal |
|
409 |
*/ |
|
410 |
@Override |
|
411 |
public boolean equals(Object other) { |
|
412 |
if (other == this) { |
|
413 |
return true; |
|
414 |
} |
|
415 |
if (other instanceof ZoneOffsetTransition) { |
|
416 |
ZoneOffsetTransition d = (ZoneOffsetTransition) other; |
|
417 |
return transition.equals(d.transition) && |
|
418 |
offsetBefore.equals(d.offsetBefore) && offsetAfter.equals(d.offsetAfter); |
|
419 |
} |
|
420 |
return false; |
|
421 |
} |
|
422 |
||
423 |
/** |
|
424 |
* Returns a suitable hash code. |
|
425 |
* |
|
426 |
* @return the hash code |
|
427 |
*/ |
|
428 |
@Override |
|
429 |
public int hashCode() { |
|
430 |
return transition.hashCode() ^ offsetBefore.hashCode() ^ Integer.rotateLeft(offsetAfter.hashCode(), 16); |
|
431 |
} |
|
432 |
||
433 |
//----------------------------------------------------------------------- |
|
434 |
/** |
|
435 |
* Returns a string describing this object. |
|
436 |
* |
|
437 |
* @return a string for debugging, not null |
|
438 |
*/ |
|
439 |
@Override |
|
440 |
public String toString() { |
|
441 |
StringBuilder buf = new StringBuilder(); |
|
442 |
buf.append("Transition[") |
|
443 |
.append(isGap() ? "Gap" : "Overlap") |
|
444 |
.append(" at ") |
|
445 |
.append(transition) |
|
446 |
.append(offsetBefore) |
|
447 |
.append(" to ") |
|
448 |
.append(offsetAfter) |
|
449 |
.append(']'); |
|
450 |
return buf.toString(); |
|
451 |
} |
|
452 |
||
453 |
} |