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	/*
	* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos
	*
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* * Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* * Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* * Neither the name of JSR-310 nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package java.time.zone;

	import java.io.DataInput;
	import java.io.DataOutput;
	import java.io.Externalizable;
	import java.io.IOException;
	import java.io.InvalidClassException;
	import java.io.ObjectInput;
	import java.io.ObjectOutput;
	import java.io.StreamCorruptedException;
	import java.time.ZoneOffset;

	/**
	* The shared serialization delegate for this package.
	*
	* @implNote
	* This class is mutable and should be created once per serialization.
	*
	* @serial include
	* @since 1.8
	*/
	final class Ser implements Externalizable {

	/**
	* Serialization version.
	*/
	private static final long serialVersionUID = -8885321777449118786L;

	/** Type for ZoneRules. */
	static final byte ZRULES = 1;
	/** Type for ZoneOffsetTransition. */
	static final byte ZOT = 2;
	/** Type for ZoneOffsetTransition. */
	static final byte ZOTRULE = 3;

	/** The type being serialized. */
	private byte type;
	/** The object being serialized. */
	private Object object;

	/**
	* Constructor for deserialization.
	*/
	public Ser() {
	}

	/**
	* Creates an instance for serialization.
	*
	* @param type the type
	* @param object the object
	*/
	Ser(byte type, Object object) {
	this.type = type;
	this.object = object;
	}

	//-----------------------------------------------------------------------
	/**
	* Implements the {@code Externalizable} interface to write the object.
	* @serialData
	* Each serializable class is mapped to a type that is the first byte
	* in the stream. Refer to each class {@code writeReplace}
	* serialized form for the value of the type and sequence of values for the type.
	*
	* <ul>
	* <li><a href="../../../serialized-form.html#java.time.zone.ZoneRules">ZoneRules.writeReplace</a>
	* <li><a href="../../../serialized-form.html#java.time.zone.ZoneOffsetTransition">ZoneOffsetTransition.writeReplace</a>
	* <li><a href="../../../serialized-form.html#java.time.zone.ZoneOffsetTransitionRule">ZoneOffsetTransitionRule.writeReplace</a>
	* </ul>
	*
	* @param out the data stream to write to, not null
	*/
	@Override
	public void writeExternal(ObjectOutput out) throws IOException {
	writeInternal(type, object, out);
	}

	static void write(Object object, DataOutput out) throws IOException {
	writeInternal(ZRULES, object, out);
	}

	private static void writeInternal(byte type, Object object, DataOutput out) throws IOException {
	out.writeByte(type);
	switch (type) {
	case ZRULES:
	((ZoneRules) object).writeExternal(out);
	break;
	case ZOT:
	((ZoneOffsetTransition) object).writeExternal(out);
	break;
	case ZOTRULE:
	((ZoneOffsetTransitionRule) object).writeExternal(out);
	break;
	default:
	throw new InvalidClassException("Unknown serialized type");
	}
	}

	//-----------------------------------------------------------------------
	/**
	* Implements the {@code Externalizable} interface to read the object.
	* @serialData
	* The streamed type and parameters defined by the type's {@code writeReplace}
	* method are read and passed to the corresponding static factory for the type
	* to create a new instance. That instance is returned as the de-serialized
	* {@code Ser} object.
	*
	* <ul>
	* <li><a href="../../../serialized-form.html#java.time.zone.ZoneRules">ZoneRules</a>
	* - {@code ZoneRules.of(standardTransitions, standardOffsets, savingsInstantTransitions, wallOffsets, lastRules);}
	* <li><a href="../../../serialized-form.html#java.time.zone.ZoneOffsetTransition">ZoneOffsetTransition</a>
	* - {@code ZoneOffsetTransition of(LocalDateTime.ofEpochSecond(epochSecond), offsetBefore, offsetAfter);}
	* <li><a href="../../../serialized-form.html#java.time.zone.ZoneOffsetTransitionRule">ZoneOffsetTransitionRule</a>
	* - {@code ZoneOffsetTransitionRule.of(month, dom, dow, time, timeEndOfDay, timeDefinition, standardOffset, offsetBefore, offsetAfter);}
	* </ul>
	* @param in the data to read, not null
	*/
	@Override
	public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
	type = in.readByte();
	object = readInternal(type, in);
	}

	static Object read(DataInput in) throws IOException, ClassNotFoundException {
	byte type = in.readByte();
	return readInternal(type, in);
	}

	private static Object readInternal(byte type, DataInput in) throws IOException, ClassNotFoundException {
	switch (type) {
	case ZRULES:
	return ZoneRules.readExternal(in);
	case ZOT:
	return ZoneOffsetTransition.readExternal(in);
	case ZOTRULE:
	return ZoneOffsetTransitionRule.readExternal(in);
	default:
	throw new StreamCorruptedException("Unknown serialized type");
	}
	}

	/**
	* Returns the object that will replace this one.
	*
	* @return the read object, should never be null
	*/
	private Object readResolve() {
	return object;
	}

	//-----------------------------------------------------------------------
	/**
	* Writes the state to the stream.
	*
	* @param offset the offset, not null
	* @param out the output stream, not null
	* @throws IOException if an error occurs
	*/
	static void writeOffset(ZoneOffset offset, DataOutput out) throws IOException {
	final int offsetSecs = offset.getTotalSeconds();
	int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127; // compress to -72 to +72
	out.writeByte(offsetByte);
	if (offsetByte == 127) {
	out.writeInt(offsetSecs);
	}
	}

	/**
	* Reads the state from the stream.
	*
	* @param in the input stream, not null
	* @return the created object, not null
	* @throws IOException if an error occurs
	*/
	static ZoneOffset readOffset(DataInput in) throws IOException {
	int offsetByte = in.readByte();
	return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));
	}

	//-----------------------------------------------------------------------
	/**
	* Writes the state to the stream.
	*
	* @param epochSec the epoch seconds, not null
	* @param out the output stream, not null
	* @throws IOException if an error occurs
	*/
	static void writeEpochSec(long epochSec, DataOutput out) throws IOException {
	if (epochSec >= -4575744000L && epochSec < 10413792000L && epochSec % 900 == 0) { // quarter hours between 1825 and 2300
	int store = (int) ((epochSec + 4575744000L) / 900);
	out.writeByte((store >>> 16) & 255);
	out.writeByte((store >>> 8) & 255);
	out.writeByte(store & 255);
	} else {
	out.writeByte(255);
	out.writeLong(epochSec);
	}
	}

	/**
	* Reads the state from the stream.
	*
	* @param in the input stream, not null
	* @return the epoch seconds, not null
	* @throws IOException if an error occurs
	*/
	static long readEpochSec(DataInput in) throws IOException {
	int hiByte = in.readByte() & 255;
	if (hiByte == 255) {
	return in.readLong();
	} else {
	int midByte = in.readByte() & 255;
	int loByte = in.readByte() & 255;
	long tot = ((hiByte << 16) + (midByte << 8) + loByte);
	return (tot * 900) - 4575744000L;
	}
	}

	}

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