/*

 * 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.

 */

/*

 * 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;

    }

}