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 }