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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) 2011-2012, 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.Externalizable;
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import java.io.IOException;
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import java.io.InvalidClassException;
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import java.io.ObjectInput;
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import java.io.ObjectOutput;
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import java.io.StreamCorruptedException;
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import java.time.ZoneOffset;
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/**
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* The shared serialization delegate for this package.
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*
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* <h3>Implementation notes</h3>
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* This class is mutable and should be created once per serialization.
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*
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* @serial include
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* @since 1.8
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*/
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final class Ser implements Externalizable {
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/**
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* Serialization version.
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*/
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private static final long serialVersionUID = -8885321777449118786L;
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/** Type for ZoneRules. */
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static final byte ZRULES = 1;
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/** Type for ZoneOffsetTransition. */
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static final byte ZOT = 2;
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/** Type for ZoneOffsetTransition. */
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static final byte ZOTRULE = 3;
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/** The type being serialized. */
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private byte type;
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/** The object being serialized. */
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private Object object;
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/**
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* Constructor for deserialization.
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*/
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public Ser() {
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}
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/**
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* Creates an instance for serialization.
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*
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* @param type the type
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* @param object the object
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*/
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Ser(byte type, Object object) {
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this.type = type;
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this.object = object;
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}
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//-----------------------------------------------------------------------
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/**
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* Implements the {@code Externalizable} interface to write the object.
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*
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* @param out the data stream to write to, not null
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*/
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public void writeExternal(ObjectOutput out) throws IOException {
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writeInternal(type, object, out);
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}
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static void write(Object object, DataOutput out) throws IOException {
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writeInternal(ZRULES, object, out);
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}
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private static void writeInternal(byte type, Object object, DataOutput out) throws IOException {
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out.writeByte(type);
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switch (type) {
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case ZRULES:
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((ZoneRules) object).writeExternal(out);
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break;
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case ZOT:
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((ZoneOffsetTransition) object).writeExternal(out);
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break;
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case ZOTRULE:
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((ZoneOffsetTransitionRule) object).writeExternal(out);
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break;
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default:
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throw new InvalidClassException("Unknown serialized type");
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}
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}
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//-----------------------------------------------------------------------
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/**
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* Implements the {@code Externalizable} interface to read the object.
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*
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* @param in the data to read, not null
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*/
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public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
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type = in.readByte();
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object = readInternal(type, in);
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}
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static Object read(DataInput in) throws IOException, ClassNotFoundException {
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byte type = in.readByte();
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return readInternal(type, in);
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}
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private static Object readInternal(byte type, DataInput in) throws IOException, ClassNotFoundException {
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switch (type) {
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case ZRULES:
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return ZoneRules.readExternal(in);
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case ZOT:
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return ZoneOffsetTransition.readExternal(in);
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case ZOTRULE:
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return ZoneOffsetTransitionRule.readExternal(in);
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default:
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throw new StreamCorruptedException("Unknown serialized type");
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}
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}
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/**
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* Returns the object that will replace this one.
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*
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* @return the read object, should never be null
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*/
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private Object readResolve() {
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return object;
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}
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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 offset the offset, not null
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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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static void writeOffset(ZoneOffset offset, DataOutput out) throws IOException {
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final int offsetSecs = offset.getTotalSeconds();
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int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127; // compress to -72 to +72
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out.writeByte(offsetByte);
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if (offsetByte == 127) {
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out.writeInt(offsetSecs);
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}
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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 ZoneOffset readOffset(DataInput in) throws IOException {
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int offsetByte = in.readByte();
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return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));
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}
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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 epochSec the epoch seconds, not null
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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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static void writeEpochSec(long epochSec, DataOutput out) throws IOException {
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if (epochSec >= -4575744000L && epochSec < 10413792000L && epochSec % 900 == 0) { // quarter hours between 1825 and 2300
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int store = (int) ((epochSec + 4575744000L) / 900);
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out.writeByte((store >>> 16) & 255);
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out.writeByte((store >>> 8) & 255);
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out.writeByte(store & 255);
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} else {
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out.writeByte(255);
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out.writeLong(epochSec);
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}
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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 epoch seconds, not null
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* @throws IOException if an error occurs
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*/
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static long readEpochSec(DataInput in) throws IOException {
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int hiByte = in.readByte() & 255;
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if (hiByte == 255) {
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return in.readLong();
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} else {
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int midByte = in.readByte() & 255;
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int loByte = in.readByte() & 255;
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long tot = ((hiByte << 16) + (midByte << 8) + loByte);
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return (tot * 900) - 4575744000L;
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}
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}
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}
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