304 lines
14 KiB
Java
304 lines
14 KiB
Java
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/*
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* Copyright (c) 2012, 2019, 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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* 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;
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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.Serializable;
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import java.io.StreamCorruptedException;
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/**
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* The shared serialization delegate for this package.
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*
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* @implNote
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* This class wraps the object being serialized, and takes a byte representing the type of the class to
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* be serialized. This byte can also be used for versioning the serialization format. In this case another
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* byte flag would be used in order to specify an alternative version of the type format.
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* For example {@code LOCAL_DATE_TYPE_VERSION_2 = 21}.
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* <p>
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* In order to serialize the object it writes its byte and then calls back to the appropriate class where
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* the serialization is performed. In order to deserialize the object it read in the type byte, switching
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* in order to select which class to call back into.
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* <p>
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* The serialization format is determined on a per class basis. In the case of field based classes each
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* of the fields is written out with an appropriate size format in descending order of the field's size. For
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* example in the case of {@link LocalDate} year is written before month. Composite classes, such as
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* {@link LocalDateTime} are serialized as one object.
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* <p>
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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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@java.io.Serial
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private static final long serialVersionUID = -7683839454370182990L;
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static final byte DURATION_TYPE = 1;
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static final byte INSTANT_TYPE = 2;
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static final byte LOCAL_DATE_TYPE = 3;
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static final byte LOCAL_TIME_TYPE = 4;
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static final byte LOCAL_DATE_TIME_TYPE = 5;
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static final byte ZONE_DATE_TIME_TYPE = 6;
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static final byte ZONE_REGION_TYPE = 7;
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static final byte ZONE_OFFSET_TYPE = 8;
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static final byte OFFSET_TIME_TYPE = 9;
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static final byte OFFSET_DATE_TIME_TYPE = 10;
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static final byte YEAR_TYPE = 11;
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static final byte YEAR_MONTH_TYPE = 12;
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static final byte MONTH_DAY_TYPE = 13;
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static final byte PERIOD_TYPE = 14;
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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 Serializable 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, Serializable 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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* @serialData
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*
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* Each serializable class is mapped to a type that is the first byte
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* in the stream. Refer to each class {@code writeReplace}
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* serialized form for the value of the type and sequence of values for the type.
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* <ul>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Duration">Duration.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Instant">Instant.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDate">LocalDate.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDateTime">LocalDateTime.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.LocalTime">LocalTime.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.MonthDay">MonthDay.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetTime">OffsetTime.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetDateTime">OffsetDateTime.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Period">Period.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Year">Year.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.YearMonth">YearMonth.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneId">ZoneId.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneOffset">ZoneOffset.writeReplace</a>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.ZonedDateTime">ZonedDateTime.writeReplace</a>
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* </ul>
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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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@Override
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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 writeInternal(byte type, Object object, ObjectOutput out) throws IOException {
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out.writeByte(type);
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switch (type) {
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case DURATION_TYPE:
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((Duration) object).writeExternal(out);
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break;
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case INSTANT_TYPE:
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((Instant) object).writeExternal(out);
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break;
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case LOCAL_DATE_TYPE:
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((LocalDate) object).writeExternal(out);
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break;
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case LOCAL_DATE_TIME_TYPE:
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((LocalDateTime) object).writeExternal(out);
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break;
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case LOCAL_TIME_TYPE:
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((LocalTime) object).writeExternal(out);
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break;
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case ZONE_REGION_TYPE:
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((ZoneRegion) object).writeExternal(out);
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break;
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case ZONE_OFFSET_TYPE:
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((ZoneOffset) object).writeExternal(out);
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break;
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case ZONE_DATE_TIME_TYPE:
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((ZonedDateTime) object).writeExternal(out);
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break;
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case OFFSET_TIME_TYPE:
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((OffsetTime) object).writeExternal(out);
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break;
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case OFFSET_DATE_TIME_TYPE:
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((OffsetDateTime) object).writeExternal(out);
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break;
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case YEAR_TYPE:
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((Year) object).writeExternal(out);
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break;
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case YEAR_MONTH_TYPE:
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((YearMonth) object).writeExternal(out);
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break;
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case MONTH_DAY_TYPE:
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((MonthDay) object).writeExternal(out);
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break;
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case PERIOD_TYPE:
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((Period) 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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* @serialData
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*
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* The streamed type and parameters defined by the type's {@code writeReplace}
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* method are read and passed to the corresponding static factory for the type
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* to create a new instance. That instance is returned as the de-serialized
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* {@code Ser} object.
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*
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* <ul>
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Duration">Duration</a> -
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* {@code Duration.ofSeconds(seconds, nanos);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Instant">Instant</a> -
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* {@code Instant.ofEpochSecond(seconds, nanos);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDate">LocalDate</a> -
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* {@code LocalDate.of(year, month, day);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDateTime">LocalDateTime</a> -
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* {@code LocalDateTime.of(date, time);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.LocalTime">LocalTime</a> -
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* {@code LocalTime.of(hour, minute, second, nano);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.MonthDay">MonthDay</a> -
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* {@code MonthDay.of(month, day);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetTime">OffsetTime</a> -
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* {@code OffsetTime.of(time, offset);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetDateTime">OffsetDateTime</a> -
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* {@code OffsetDateTime.of(dateTime, offset);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Period">Period</a> -
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* {@code Period.of(years, months, days);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.Year">Year</a> -
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* {@code Year.of(year);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.YearMonth">YearMonth</a> -
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* {@code YearMonth.of(year, month);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.ZonedDateTime">ZonedDateTime</a> -
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* {@code ZonedDateTime.ofLenient(dateTime, offset, zone);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneId">ZoneId</a> -
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* {@code ZoneId.of(id);}
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* <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneOffset">ZoneOffset</a> -
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* {@code (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) :
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* ZoneOffset.ofTotalSeconds(offsetByte * 900));}
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* </ul>
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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 Serializable read(ObjectInput 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 Serializable readInternal(byte type, ObjectInput in)
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throws IOException, ClassNotFoundException {
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switch (type) {
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case DURATION_TYPE: return Duration.readExternal(in);
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case INSTANT_TYPE: return Instant.readExternal(in);
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case LOCAL_DATE_TYPE: return LocalDate.readExternal(in);
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case LOCAL_DATE_TIME_TYPE: return LocalDateTime.readExternal(in);
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case LOCAL_TIME_TYPE: return LocalTime.readExternal(in);
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case ZONE_DATE_TIME_TYPE: return ZonedDateTime.readExternal(in);
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case ZONE_OFFSET_TYPE: return ZoneOffset.readExternal(in);
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case ZONE_REGION_TYPE: return ZoneRegion.readExternal(in);
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case OFFSET_TIME_TYPE: return OffsetTime.readExternal(in);
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case OFFSET_DATE_TIME_TYPE: return OffsetDateTime.readExternal(in);
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case YEAR_TYPE: return Year.readExternal(in);
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case YEAR_MONTH_TYPE: return YearMonth.readExternal(in);
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case MONTH_DAY_TYPE: return MonthDay.readExternal(in);
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case PERIOD_TYPE: return Period.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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@java.io.Serial
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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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