1 /*
2 * Copyright (c) 2012, 2019, 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;
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
66 /**
67 * The shared serialization delegate for this package.
68 *
69 * @implNote
70 * This class wraps the object being serialized, and takes a byte representing the type of the class to
71 * be serialized. This byte can also be used for versioning the serialization format. In this case another
72 * byte flag would be used in order to specify an alternative version of the type format.
73 * For example {@code LOCAL_DATE_TYPE_VERSION_2 = 21}.
74 * <p>
75 * In order to serialize the object it writes its byte and then calls back to the appropriate class where
76 * the serialization is performed. In order to deserialize the object it read in the type byte, switching
77 * in order to select which class to call back into.
78 * <p>
79 * The serialization format is determined on a per class basis. In the case of field based classes each
80 * of the fields is written out with an appropriate size format in descending order of the field's size. For
81 * example in the case of {@link LocalDate} year is written before month. Composite classes, such as
82 * {@link LocalDateTime} are serialized as one object.
83 * <p>
84 * This class is mutable and should be created once per serialization.
85 *
86 * @serial include
87 * @since 1.8
88 */
89 final class Ser implements Externalizable {
90
91 /**
92 * Serialization version.
93 */
94 @java.io.Serial
95 private static final long serialVersionUID = -7683839454370182990L;
96
97 static final byte DURATION_TYPE = 1;
98 static final byte INSTANT_TYPE = 2;
99 static final byte LOCAL_DATE_TYPE = 3;
100 static final byte LOCAL_TIME_TYPE = 4;
101 static final byte LOCAL_DATE_TIME_TYPE = 5;
102 static final byte ZONE_DATE_TIME_TYPE = 6;
103 static final byte ZONE_REGION_TYPE = 7;
104 static final byte ZONE_OFFSET_TYPE = 8;
105 static final byte OFFSET_TIME_TYPE = 9;
106 static final byte OFFSET_DATE_TIME_TYPE = 10;
107 static final byte YEAR_TYPE = 11;
108 static final byte YEAR_MONTH_TYPE = 12;
109 static final byte MONTH_DAY_TYPE = 13;
110 static final byte PERIOD_TYPE = 14;
111
112 /** The type being serialized. */
113 private byte type;
114 /** The object being serialized. */
115 @SuppressWarnings("serial") // Not statically typed as Serializable
116 private Object object;
117
118 /**
119 * Constructor for deserialization.
120 */
121 public Ser() {
122 }
123
124 /**
125 * Creates an instance for serialization.
126 *
127 * @param type the type
128 * @param object the object
129 */
130 Ser(byte type, Object object) {
131 this.type = type;
132 this.object = object;
133 }
134
135 //-----------------------------------------------------------------------
136 /**
137 * Implements the {@code Externalizable} interface to write the object.
138 * @serialData
139 *
140 * Each serializable class is mapped to a type that is the first byte
141 * in the stream. Refer to each class {@code writeReplace}
142 * serialized form for the value of the type and sequence of values for the type.
143 * <ul>
144 * <li><a href="{@docRoot}/serialized-form.html#java.time.Duration">Duration.writeReplace</a>
145 * <li><a href="{@docRoot}/serialized-form.html#java.time.Instant">Instant.writeReplace</a>
146 * <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDate">LocalDate.writeReplace</a>
147 * <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDateTime">LocalDateTime.writeReplace</a>
148 * <li><a href="{@docRoot}/serialized-form.html#java.time.LocalTime">LocalTime.writeReplace</a>
149 * <li><a href="{@docRoot}/serialized-form.html#java.time.MonthDay">MonthDay.writeReplace</a>
150 * <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetTime">OffsetTime.writeReplace</a>
151 * <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetDateTime">OffsetDateTime.writeReplace</a>
152 * <li><a href="{@docRoot}/serialized-form.html#java.time.Period">Period.writeReplace</a>
153 * <li><a href="{@docRoot}/serialized-form.html#java.time.Year">Year.writeReplace</a>
154 * <li><a href="{@docRoot}/serialized-form.html#java.time.YearMonth">YearMonth.writeReplace</a>
155 * <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneId">ZoneId.writeReplace</a>
156 * <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneOffset">ZoneOffset.writeReplace</a>
157 * <li><a href="{@docRoot}/serialized-form.html#java.time.ZonedDateTime">ZonedDateTime.writeReplace</a>
158 * </ul>
159 *
160 * @param out the data stream to write to, not null
161 */
162 @Override
163 public void writeExternal(ObjectOutput out) throws IOException {
164 writeInternal(type, object, out);
165 }
166
167 static void writeInternal(byte type, Object object, ObjectOutput out) throws IOException {
168 out.writeByte(type);
169 switch (type) {
170 case DURATION_TYPE:
171 ((Duration) object).writeExternal(out);
172 break;
173 case INSTANT_TYPE:
174 ((Instant) object).writeExternal(out);
175 break;
176 case LOCAL_DATE_TYPE:
177 ((LocalDate) object).writeExternal(out);
178 break;
179 case LOCAL_DATE_TIME_TYPE:
180 ((LocalDateTime) object).writeExternal(out);
181 break;
182 case LOCAL_TIME_TYPE:
183 ((LocalTime) object).writeExternal(out);
184 break;
185 case ZONE_REGION_TYPE:
186 ((ZoneRegion) object).writeExternal(out);
187 break;
188 case ZONE_OFFSET_TYPE:
189 ((ZoneOffset) object).writeExternal(out);
190 break;
191 case ZONE_DATE_TIME_TYPE:
192 ((ZonedDateTime) object).writeExternal(out);
193 break;
194 case OFFSET_TIME_TYPE:
195 ((OffsetTime) object).writeExternal(out);
196 break;
197 case OFFSET_DATE_TIME_TYPE:
198 ((OffsetDateTime) object).writeExternal(out);
199 break;
200 case YEAR_TYPE:
201 ((Year) object).writeExternal(out);
202 break;
203 case YEAR_MONTH_TYPE:
204 ((YearMonth) object).writeExternal(out);
205 break;
206 case MONTH_DAY_TYPE:
207 ((MonthDay) object).writeExternal(out);
208 break;
209 case PERIOD_TYPE:
210 ((Period) object).writeExternal(out);
211 break;
212 default:
213 throw new InvalidClassException("Unknown serialized type");
214 }
215 }
216
217 //-----------------------------------------------------------------------
218 /**
219 * Implements the {@code Externalizable} interface to read the object.
220 * @serialData
221 *
222 * The streamed type and parameters defined by the type's {@code writeReplace}
223 * method are read and passed to the corresponding static factory for the type
224 * to create a new instance. That instance is returned as the de-serialized
225 * {@code Ser} object.
226 *
227 * <ul>
228 * <li><a href="{@docRoot}/serialized-form.html#java.time.Duration">Duration</a> - {@code Duration.ofSeconds(seconds, nanos);}
229 * <li><a href="{@docRoot}/serialized-form.html#java.time.Instant">Instant</a> - {@code Instant.ofEpochSecond(seconds, nanos);}
230 * <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDate">LocalDate</a> - {@code LocalDate.of(year, month, day);}
231 * <li><a href="{@docRoot}/serialized-form.html#java.time.LocalDateTime">LocalDateTime</a> - {@code LocalDateTime.of(date, time);}
232 * <li><a href="{@docRoot}/serialized-form.html#java.time.LocalTime">LocalTime</a> - {@code LocalTime.of(hour, minute, second, nano);}
233 * <li><a href="{@docRoot}/serialized-form.html#java.time.MonthDay">MonthDay</a> - {@code MonthDay.of(month, day);}
234 * <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetTime">OffsetTime</a> - {@code OffsetTime.of(time, offset);}
235 * <li><a href="{@docRoot}/serialized-form.html#java.time.OffsetDateTime">OffsetDateTime</a> - {@code OffsetDateTime.of(dateTime, offset);}
236 * <li><a href="{@docRoot}/serialized-form.html#java.time.Period">Period</a> - {@code Period.of(years, months, days);}
237 * <li><a href="{@docRoot}/serialized-form.html#java.time.Year">Year</a> - {@code Year.of(year);}
238 * <li><a href="{@docRoot}/serialized-form.html#java.time.YearMonth">YearMonth</a> - {@code YearMonth.of(year, month);}
239 * <li><a href="{@docRoot}/serialized-form.html#java.time.ZonedDateTime">ZonedDateTime</a> - {@code ZonedDateTime.ofLenient(dateTime, offset, zone);}
240 * <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneId">ZoneId</a> - {@code ZoneId.of(id);}
241 * <li><a href="{@docRoot}/serialized-form.html#java.time.ZoneOffset">ZoneOffset</a> - {@code (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));}
242 * </ul>
243 *
244 * @param in the data to read, not null
245 */
246 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
247 type = in.readByte();
248 object = readInternal(type, in);
249 }
250
251 static Object read(ObjectInput in) throws IOException, ClassNotFoundException {
252 byte type = in.readByte();
253 return readInternal(type, in);
254 }
255
256 private static Object readInternal(byte type, ObjectInput in) throws IOException, ClassNotFoundException {
257 switch (type) {
258 case DURATION_TYPE: return Duration.readExternal(in);
259 case INSTANT_TYPE: return Instant.readExternal(in);
260 case LOCAL_DATE_TYPE: return LocalDate.readExternal(in);
261 case LOCAL_DATE_TIME_TYPE: return LocalDateTime.readExternal(in);
262 case LOCAL_TIME_TYPE: return LocalTime.readExternal(in);
263 case ZONE_DATE_TIME_TYPE: return ZonedDateTime.readExternal(in);
264 case ZONE_OFFSET_TYPE: return ZoneOffset.readExternal(in);
265 case ZONE_REGION_TYPE: return ZoneRegion.readExternal(in);
266 case OFFSET_TIME_TYPE: return OffsetTime.readExternal(in);
267 case OFFSET_DATE_TIME_TYPE: return OffsetDateTime.readExternal(in);
268 case YEAR_TYPE: return Year.readExternal(in);
269 case YEAR_MONTH_TYPE: return YearMonth.readExternal(in);
270 case MONTH_DAY_TYPE: return MonthDay.readExternal(in);
271 case PERIOD_TYPE: return Period.readExternal(in);
272 default:
273 throw new StreamCorruptedException("Unknown serialized type");
274 }
275 }
276
277 /**
278 * Returns the object that will replace this one.
279 *
280 * @return the read object, should never be null
281 */
282 @java.io.Serial
283 private Object readResolve() {
284 return object;
285 }
286
287 }