1 /*
2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /*
27 * Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos
28 *
29 * All rights reserved.
30 *
31 * Redistribution and use in source and binary forms, with or without
32 * modification, are permitted provided that the following conditions are met:
33 *
34 * * Redistributions of source code must retain the above copyright notice,
35 * this list of conditions and the following disclaimer.
36 *
37 * * Redistributions in binary form must reproduce the above copyright notice,
38 * this list of conditions and the following disclaimer in the documentation
39 * and/or other materials provided with the distribution.
40 *
41 * * Neither the name of JSR-310 nor the names of its contributors
42 * may be used to endorse or promote products derived from this software
43 * without specific prior written permission.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
46 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
47 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
48 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
49 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
50 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
51 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
52 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
53 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
54 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
55 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56 */
57 package java.time.chrono;
58
59 import java.io.Externalizable;
60 import java.io.IOException;
61 import java.io.InvalidClassException;
62 import java.io.ObjectInput;
63 import java.io.ObjectOutput;
64 import java.io.StreamCorruptedException;
65 import java.time.LocalDate;
66 import java.time.LocalDateTime;
67
68 /**
69 * The shared serialization delegate for this package.
70 *
71 * @implNote
72 * This class wraps the object being serialized, and takes a byte representing the type of the class to
73 * be serialized. This byte can also be used for versioning the serialization format. In this case another
74 * byte flag would be used in order to specify an alternative version of the type format.
75 * For example {@code CHRONO_TYPE_VERSION_2 = 21}
76 * <p>
77 * In order to serialize the object it writes its byte and then calls back to the appropriate class where
78 * the serialization is performed. In order to deserialize the object it read in the type byte, switching
79 * in order to select which class to call back into.
80 * <p>
81 * The serialization format is determined on a per class basis. In the case of field based classes each
82 * of the fields is written out with an appropriate size format in descending order of the field's size. For
83 * example in the case of {@link LocalDate} year is written before month. Composite classes, such as
84 * {@link LocalDateTime} are serialized as one object. Enum classes are serialized using the index of their
85 * element.
86 * <p>
87 * This class is mutable and should be created once per serialization.
88 *
89 * @serial include
90 * @since 1.8
91 */
92 final class Ser implements Externalizable {
93
94 /**
95 * Serialization version.
96 */
97 private static final long serialVersionUID = -6103370247208168577L;
98
99 static final byte CHRONO_TYPE = 1;
100 static final byte CHRONO_LOCAL_DATE_TIME_TYPE = 2;
101 static final byte CHRONO_ZONE_DATE_TIME_TYPE = 3;
102 static final byte JAPANESE_DATE_TYPE = 4;
103 static final byte JAPANESE_ERA_TYPE = 5;
104 static final byte HIJRAH_DATE_TYPE = 6;
105 static final byte MINGUO_DATE_TYPE = 7;
106 static final byte THAIBUDDHIST_DATE_TYPE = 8;
107 static final byte CHRONO_PERIOD_TYPE = 9;
108
109 /** The type being serialized. */
110 private byte type;
111 /** The object being serialized. */
112 private Object object;
113
114 /**
115 * Constructor for deserialization.
116 */
117 public Ser() {
118 }
119
120 /**
121 * Creates an instance for serialization.
122 *
123 * @param type the type
124 * @param object the object
125 */
126 Ser(byte type, Object object) {
127 this.type = type;
128 this.object = object;
129 }
130
131 //-----------------------------------------------------------------------
132 /**
133 * Implements the {@code Externalizable} interface to write the object.
134 * @serialData
135 * Each serializable class is mapped to a type that is the first byte
136 * in the stream. Refer to each class {@code writeReplace}
137 * serialized form for the value of the type and sequence of values for the type.
138 * <ul>
139 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.HijrahChronology">HijrahChronology.writeReplace</a>
140 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.IsoChronology">IsoChronology.writeReplace</a>
141 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.JapaneseChronology">JapaneseChronology.writeReplace</a>
142 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.MinguoChronology">MinguoChronology.writeReplace</a>
143 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ThaiBuddhistChronology">ThaiBuddhistChronology.writeReplace</a>
144 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ChronoLocalDateTimeImpl">ChronoLocalDateTime.writeReplace</a>
145 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ChronoZonedDateTimeImpl">ChronoZonedDateTime.writeReplace</a>
146 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.JapaneseDate">JapaneseDate.writeReplace</a>
147 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.JapaneseEra">JapaneseEra.writeReplace</a>
148 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.HijrahDate">HijrahDate.writeReplace</a>
149 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.MinguoDate">MinguoDate.writeReplace</a>
150 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ThaiBuddhistDate">ThaiBuddhistDate.writeReplace</a>
151 * </ul>
152 *
153 * @param out the data stream to write to, not null
154 */
155 @Override
156 public void writeExternal(ObjectOutput out) throws IOException {
157 writeInternal(type, object, out);
158 }
159
160 private static void writeInternal(byte type, Object object, ObjectOutput out) throws IOException {
161 out.writeByte(type);
162 switch (type) {
163 case CHRONO_TYPE:
164 ((AbstractChronology) object).writeExternal(out);
165 break;
166 case CHRONO_LOCAL_DATE_TIME_TYPE:
167 ((ChronoLocalDateTimeImpl<?>) object).writeExternal(out);
168 break;
169 case CHRONO_ZONE_DATE_TIME_TYPE:
170 ((ChronoZonedDateTimeImpl<?>) object).writeExternal(out);
171 break;
172 case JAPANESE_DATE_TYPE:
173 ((JapaneseDate) object).writeExternal(out);
174 break;
175 case JAPANESE_ERA_TYPE:
176 ((JapaneseEra) object).writeExternal(out);
177 break;
178 case HIJRAH_DATE_TYPE:
179 ((HijrahDate) object).writeExternal(out);
180 break;
181 case MINGUO_DATE_TYPE:
182 ((MinguoDate) object).writeExternal(out);
183 break;
184 case THAIBUDDHIST_DATE_TYPE:
185 ((ThaiBuddhistDate) object).writeExternal(out);
186 break;
187 case CHRONO_PERIOD_TYPE:
188 ((ChronoPeriodImpl) object).writeExternal(out);
189 break;
190 default:
191 throw new InvalidClassException("Unknown serialized type");
192 }
193 }
194
195 //-----------------------------------------------------------------------
196 /**
197 * Implements the {@code Externalizable} interface to read the object.
198 * @serialData
199 * The streamed type and parameters defined by the type's {@code writeReplace}
200 * method are read and passed to the corresponding static factory for the type
201 * to create a new instance. That instance is returned as the de-serialized
202 * {@code Ser} object.
203 *
204 * <ul>
205 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.HijrahChronology">HijrahChronology</a> - Chronology.of(id)
206 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.IsoChronology">IsoChronology</a> - Chronology.of(id)
207 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.JapaneseChronology">JapaneseChronology</a> - Chronology.of(id)
208 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.MinguoChronology">MinguoChronology</a> - Chronology.of(id)
209 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ThaiBuddhistChronology">ThaiBuddhistChronology</a> - Chronology.of(id)
210 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ChronoLocalDateTimeImpl">ChronoLocalDateTime</a> - date.atTime(time)
211 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ChronoZonedDateTimeImpl">ChronoZonedDateTime</a> - dateTime.atZone(offset).withZoneSameLocal(zone)
212 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.JapaneseDate">JapaneseDate</a> - JapaneseChronology.INSTANCE.date(year, month, dayOfMonth)
213 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.JapaneseEra">JapaneseEra</a> - JapaneseEra.of(eraValue)
214 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.HijrahDate">HijrahDate</a> - HijrahChronology chrono.date(year, month, dayOfMonth)
215 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.MinguoDate">MinguoDate</a> - MinguoChronology.INSTANCE.date(year, month, dayOfMonth)
216 * <li><a href="{@docRoot}/serialized-form.html#java.time.chrono.ThaiBuddhistDate">ThaiBuddhistDate</a> - ThaiBuddhistChronology.INSTANCE.date(year, month, dayOfMonth)
217 * </ul>
218 *
219 * @param in the data stream to read from, not null
220 */
221 @Override
222 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
223 type = in.readByte();
224 object = readInternal(type, in);
225 }
226
227 static Object read(ObjectInput in) throws IOException, ClassNotFoundException {
228 byte type = in.readByte();
229 return readInternal(type, in);
230 }
231
232 private static Object readInternal(byte type, ObjectInput in) throws IOException, ClassNotFoundException {
233 switch (type) {
234 case CHRONO_TYPE: return AbstractChronology.readExternal(in);
235 case CHRONO_LOCAL_DATE_TIME_TYPE: return ChronoLocalDateTimeImpl.readExternal(in);
236 case CHRONO_ZONE_DATE_TIME_TYPE: return ChronoZonedDateTimeImpl.readExternal(in);
237 case JAPANESE_DATE_TYPE: return JapaneseDate.readExternal(in);
238 case JAPANESE_ERA_TYPE: return JapaneseEra.readExternal(in);
239 case HIJRAH_DATE_TYPE: return HijrahDate.readExternal(in);
240 case MINGUO_DATE_TYPE: return MinguoDate.readExternal(in);
241 case THAIBUDDHIST_DATE_TYPE: return ThaiBuddhistDate.readExternal(in);
242 case CHRONO_PERIOD_TYPE: return ChronoPeriodImpl.readExternal(in);
243 default: throw new StreamCorruptedException("Unknown serialized type");
244 }
245 }
246
247 /**
248 * Returns the object that will replace this one.
249 *
250 * @return the read object, should never be null
251 */
252 private Object readResolve() {
253 return object;
254 }
255
256 }