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 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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/*
 * 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;

import java.io.Externalizable;
import java.io.IOException;
import java.io.InvalidClassException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.StreamCorruptedException;

/**
 * The shared serialization delegate for this package.
 *
 * @implNote
 * This class wraps the object being serialized, and takes a byte representing the type of the class to
 * be serialized. This byte can also be used for versioning the serialization format. In this case another
 * byte flag would be used in order to specify an alternative version of the type format.
 * For example {@code LOCAL_DATE_TYPE_VERSION_2 = 21}.
 * <p>
 * In order to serialize the object it writes its byte and then calls back to the appropriate class where
 * the serialization is performed. In order to deserialize the object it read in the type byte, switching
 * in order to select which class to call back into.
 * <p>
 * The serialization format is determined on a per class basis. In the case of field based classes each
 * of the fields is written out with an appropriate size format in descending order of the field's size. For
 * example in the case of {@link LocalDate} year is written before month. Composite classes, such as
 * {@link LocalDateTime} are serialized as one object.
 * <p>
 * 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 = -7683839454370182990L;

 static final byte DURATION_TYPE = 1;
 static final byte INSTANT_TYPE = 2;
 static final byte LOCAL_DATE_TYPE = 3;
 static final byte LOCAL_TIME_TYPE = 4;
 static final byte LOCAL_DATE_TIME_TYPE = 5;
 static final byte ZONE_DATE_TIME_TYPE = 6;
 static final byte ZONE_REGION_TYPE = 7;
 static final byte ZONE_OFFSET_TYPE = 8;
 static final byte OFFSET_TIME_TYPE = 9;
 static final byte OFFSET_DATE_TIME_TYPE = 10;
 static final byte YEAR_TYPE = 11;
 static final byte YEAR_MONTH_TYPE = 12;
 static final byte MONTH_DAY_TYPE = 13;
 static final byte PERIOD_TYPE = 14;

 /** 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.Duration">Duration.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.Instant">Instant.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.LocalDate">LocalDate.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.LocalDateTime">LocalDateTime.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.LocalTime">LocalTime.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.MonthDay">MonthDay.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.OffsetTime">OffsetTime.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.OffsetDateTime">OffsetDateTime.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.Period">Period.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.Year">Year.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.YearMonth">YearMonth.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.ZoneId">ZoneId.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.ZoneOffset">ZoneOffset.writeReplace</a>
 * <li><a href="../../serialized-form.html#java.time.ZonedDateTime">ZonedDateTime.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 writeInternal(byte type, Object object, ObjectOutput out) throws IOException {
 out.writeByte(type);
 switch (type) {
 case DURATION_TYPE:
 ((Duration) object).writeExternal(out);
 break;
 case INSTANT_TYPE:
 ((Instant) object).writeExternal(out);
 break;
 case LOCAL_DATE_TYPE:
 ((LocalDate) object).writeExternal(out);
 break;
 case LOCAL_DATE_TIME_TYPE:
 ((LocalDateTime) object).writeExternal(out);
 break;
 case LOCAL_TIME_TYPE:
 ((LocalTime) object).writeExternal(out);
 break;
 case ZONE_REGION_TYPE:
 ((ZoneRegion) object).writeExternal(out);
 break;
 case ZONE_OFFSET_TYPE:
 ((ZoneOffset) object).writeExternal(out);
 break;
 case ZONE_DATE_TIME_TYPE:
 ((ZonedDateTime) object).writeExternal(out);
 break;
 case OFFSET_TIME_TYPE:
 ((OffsetTime) object).writeExternal(out);
 break;
 case OFFSET_DATE_TIME_TYPE:
 ((OffsetDateTime) object).writeExternal(out);
 break;
 case YEAR_TYPE:
 ((Year) object).writeExternal(out);
 break;
 case YEAR_MONTH_TYPE:
 ((YearMonth) object).writeExternal(out);
 break;
 case MONTH_DAY_TYPE:
 ((MonthDay) object).writeExternal(out);
 break;
 case PERIOD_TYPE:
 ((Period) 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.Duration">Duration</a> - {@code Duration.ofSeconds(seconds, nanos);}
 * <li><a href="../../serialized-form.html#java.time.Instant">Instant</a> - {@code Instant.ofEpochSecond(seconds, nanos);}
 * <li><a href="../../serialized-form.html#java.time.LocalDate">LocalDate</a> - {@code LocalDate.of(year, month, day);}
 * <li><a href="../../serialized-form.html#java.time.LocalDateTime">LocalDateTime</a> - {@code LocalDateTime.of(date, time);}
 * <li><a href="../../serialized-form.html#java.time.LocalTime">LocalTime</a> - {@code LocalTime.of(hour, minute, second, nano);}
 * <li><a href="../../serialized-form.html#java.time.MonthDay">MonthDay</a> - {@code MonthDay.of(month, day);}
 * <li><a href="../../serialized-form.html#java.time.OffsetTime">OffsetTime</a> - {@code OffsetTime.of(time, offset);}
 * <li><a href="../../serialized-form.html#java.time.OffsetDateTime">OffsetDateTime</a> - {@code OffsetDateTime.of(dateTime, offset);}
 * <li><a href="../../serialized-form.html#java.time.Period">Period</a> - {@code Period.of(years, months, days);}
 * <li><a href="../../serialized-form.html#java.time.Year">Year</a> - {@code Year.of(year);}
 * <li><a href="../../serialized-form.html#java.time.YearMonth">YearMonth</a> - {@code YearMonth.of(year, month);}
 * <li><a href="../../serialized-form.html#java.time.ZonedDateTime">ZonedDateTime</a> - {@code ZonedDateTime.ofLenient(dateTime, offset, zone);}
 * <li><a href="../../serialized-form.html#java.time.ZoneId">ZoneId</a> - {@code ZoneId.of(id);}
 * <li><a href="../../serialized-form.html#java.time.ZoneOffset">ZoneOffset</a> - {@code (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));}
 * </ul>
 *
 * @param in the data to read, not null
 */
 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
 type = in.readByte();
 object = readInternal(type, in);
 }

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

 private static Object readInternal(byte type, ObjectInput in) throws IOException, ClassNotFoundException {
 switch (type) {
 case DURATION_TYPE: return Duration.readExternal(in);
 case INSTANT_TYPE: return Instant.readExternal(in);
 case LOCAL_DATE_TYPE: return LocalDate.readExternal(in);
 case LOCAL_DATE_TIME_TYPE: return LocalDateTime.readExternal(in);
 case LOCAL_TIME_TYPE: return LocalTime.readExternal(in);
 case ZONE_DATE_TIME_TYPE: return ZonedDateTime.readExternal(in);
 case ZONE_OFFSET_TYPE: return ZoneOffset.readExternal(in);
 case ZONE_REGION_TYPE: return ZoneRegion.readExternal(in);
 case OFFSET_TIME_TYPE: return OffsetTime.readExternal(in);
 case OFFSET_DATE_TIME_TYPE: return OffsetDateTime.readExternal(in);
 case YEAR_TYPE: return Year.readExternal(in);
 case YEAR_MONTH_TYPE: return YearMonth.readExternal(in);
 case MONTH_DAY_TYPE: return MonthDay.readExternal(in);
 case PERIOD_TYPE: return Period.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;
 }

}