1 /*
2 * Copyright (c) 2012, 2013, 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 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos
33 *
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions are met:
38 *
39 * * Redistributions of source code must retain the above copyright notice,
40 * this list of conditions and the following disclaimer.
41 *
42 * * Redistributions in binary form must reproduce the above copyright notice,
43 * this list of conditions and the following disclaimer in the documentation
44 * and/or other materials provided with the distribution.
45 *
46 * * Neither the name of JSR-310 nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
54 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
55 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
56 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
59 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
60 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 package java.time.zone;
63
64 import java.io.DataInput;
65 import java.io.DataOutput;
66 import java.io.Externalizable;
67 import java.io.IOException;
68 import java.io.InvalidClassException;
69 import java.io.ObjectInput;
70 import java.io.ObjectOutput;
71 import java.io.StreamCorruptedException;
72 import java.time.ZoneOffset;
73
74 /**
75 * The shared serialization delegate for this package.
76 *
77 * <h3>Implementation notes</h3>
78 * This class is mutable and should be created once per serialization.
79 *
80 * @serial include
81 * @since 1.8
82 */
83 final class Ser implements Externalizable {
84
85 /**
86 * Serialization version.
87 */
88 private static final long serialVersionUID = -8885321777449118786L;
89
90 /** Type for ZoneRules. */
91 static final byte ZRULES = 1;
92 /** Type for ZoneOffsetTransition. */
93 static final byte ZOT = 2;
94 /** Type for ZoneOffsetTransition. */
95 static final byte ZOTRULE = 3;
96
97 /** The type being serialized. */
98 private byte type;
99 /** The object being serialized. */
100 private Object object;
101
102 /**
103 * Constructor for deserialization.
104 */
105 public Ser() {
106 }
107
108 /**
109 * Creates an instance for serialization.
110 *
111 * @param type the type
112 * @param object the object
113 */
114 Ser(byte type, Object object) {
115 this.type = type;
116 this.object = object;
117 }
118
119 //-----------------------------------------------------------------------
120 /**
121 * Implements the {@code Externalizable} interface to write the object.
122 *
123 * @param out the data stream to write to, not null
124 */
125 public void writeExternal(ObjectOutput out) throws IOException {
126 writeInternal(type, object, out);
127 }
128
129 static void write(Object object, DataOutput out) throws IOException {
130 writeInternal(ZRULES, object, out);
131 }
132
133 private static void writeInternal(byte type, Object object, DataOutput out) throws IOException {
134 out.writeByte(type);
135 switch (type) {
136 case ZRULES:
137 ((ZoneRules) object).writeExternal(out);
138 break;
139 case ZOT:
140 ((ZoneOffsetTransition) object).writeExternal(out);
141 break;
142 case ZOTRULE:
143 ((ZoneOffsetTransitionRule) object).writeExternal(out);
144 break;
145 default:
146 throw new InvalidClassException("Unknown serialized type");
147 }
148 }
149
150 //-----------------------------------------------------------------------
151 /**
152 * Implements the {@code Externalizable} interface to read the object.
153 *
154 * @param in the data to read, not null
155 */
156 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
157 type = in.readByte();
158 object = readInternal(type, in);
159 }
160
161 static Object read(DataInput in) throws IOException, ClassNotFoundException {
162 byte type = in.readByte();
163 return readInternal(type, in);
164 }
165
166 private static Object readInternal(byte type, DataInput in) throws IOException, ClassNotFoundException {
167 switch (type) {
168 case ZRULES:
169 return ZoneRules.readExternal(in);
170 case ZOT:
171 return ZoneOffsetTransition.readExternal(in);
172 case ZOTRULE:
173 return ZoneOffsetTransitionRule.readExternal(in);
174 default:
175 throw new StreamCorruptedException("Unknown serialized type");
176 }
177 }
178
179 /**
180 * Returns the object that will replace this one.
181 *
182 * @return the read object, should never be null
183 */
184 private Object readResolve() {
185 return object;
186 }
187
188 //-----------------------------------------------------------------------
189 /**
190 * Writes the state to the stream.
191 *
192 * @param offset the offset, not null
193 * @param out the output stream, not null
194 * @throws IOException if an error occurs
195 */
196 static void writeOffset(ZoneOffset offset, DataOutput out) throws IOException {
197 final int offsetSecs = offset.getTotalSeconds();
198 int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127; // compress to -72 to +72
199 out.writeByte(offsetByte);
200 if (offsetByte == 127) {
201 out.writeInt(offsetSecs);
202 }
203 }
204
205 /**
206 * Reads the state from the stream.
207 *
208 * @param in the input stream, not null
209 * @return the created object, not null
210 * @throws IOException if an error occurs
211 */
212 static ZoneOffset readOffset(DataInput in) throws IOException {
213 int offsetByte = in.readByte();
214 return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));
215 }
216
217 //-----------------------------------------------------------------------
218 /**
219 * Writes the state to the stream.
220 *
221 * @param epochSec the epoch seconds, not null
222 * @param out the output stream, not null
223 * @throws IOException if an error occurs
224 */
225 static void writeEpochSec(long epochSec, DataOutput out) throws IOException {
226 if (epochSec >= -4575744000L && epochSec < 10413792000L && epochSec % 900 == 0) { // quarter hours between 1825 and 2300
227 int store = (int) ((epochSec + 4575744000L) / 900);
228 out.writeByte((store >>> 16) & 255);
229 out.writeByte((store >>> 8) & 255);
230 out.writeByte(store & 255);
231 } else {
232 out.writeByte(255);
233 out.writeLong(epochSec);
234 }
235 }
236
237 /**
238 * Reads the state from the stream.
239 *
240 * @param in the input stream, not null
241 * @return the epoch seconds, not null
242 * @throws IOException if an error occurs
243 */
244 static long readEpochSec(DataInput in) throws IOException {
245 int hiByte = in.readByte() & 255;
246 if (hiByte == 255) {
247 return in.readLong();
248 } else {
249 int midByte = in.readByte() & 255;
250 int loByte = in.readByte() & 255;
251 long tot = ((hiByte << 16) + (midByte << 8) + loByte);
252 return (tot * 900) - 4575744000L;
253 }
254 }
255
256 }