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1 /* |
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 /* |
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27 * Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos |
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28 * |
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29 * All rights reserved. |
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30 * |
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31 * Redistribution and use in source and binary forms, with or without |
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32 * modification, are permitted provided that the following conditions are met: |
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33 * |
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34 * * Redistributions of source code must retain the above copyright notice, |
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35 * this list of conditions and the following disclaimer. |
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36 * |
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37 * * Redistributions in binary form must reproduce the above copyright notice, |
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38 * this list of conditions and the following disclaimer in the documentation |
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39 * and/or other materials provided with the distribution. |
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40 * |
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41 * * Neither the name of JSR-310 nor the names of its contributors |
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42 * may be used to endorse or promote products derived from this software |
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43 * without specific prior written permission. |
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44 * |
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45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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46 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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47 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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48 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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49 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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50 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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51 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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52 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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53 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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54 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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55 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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56 */ |
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57 package java.time.chrono; |
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58 |
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59 import java.io.Externalizable; |
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60 import java.io.IOException; |
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61 import java.io.InvalidClassException; |
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62 import java.io.ObjectInput; |
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63 import java.io.ObjectOutput; |
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64 import java.io.StreamCorruptedException; |
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65 import java.time.LocalDate; |
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66 import java.time.LocalDateTime; |
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67 |
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68 /** |
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69 * The shared serialization delegate for this package. |
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70 * |
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71 * <h3>Implementation notes</h3> |
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72 * This class wraps the object being serialized, and takes a byte representing the type of the class to |
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73 * be serialized. This byte can also be used for versioning the serialization format. In this case another |
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74 * byte flag would be used in order to specify an alternative version of the type format. |
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75 * For example {@code CHRONO_TYPE_VERSION_2 = 21} |
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76 * <p> |
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77 * In order to serialise the object it writes its byte and then calls back to the appropriate class where |
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78 * the serialisation is performed. In order to deserialise the object it read in the type byte, switching |
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79 * in order to select which class to call back into. |
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80 * <p> |
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81 * The serialisation format is determined on a per class basis. In the case of field based classes each |
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82 * of the fields is written out with an appropriate size format in descending order of the field's size. For |
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83 * example in the case of {@link LocalDate} year is written before month. Composite classes, such as |
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84 * {@link LocalDateTime} are serialised as one object. Enum classes are serialised using the index of their |
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85 * element. |
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86 * <p> |
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87 * This class is mutable and should be created once per serialization. |
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88 * |
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89 * @serial include |
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90 * @since 1.8 |
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91 */ |
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92 final class Ser implements Externalizable { |
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93 |
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94 /** |
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95 * Serialization version. |
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96 */ |
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97 private static final long serialVersionUID = -6103370247208168577L; |
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98 |
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99 static final byte CHRONO_TYPE = 1; |
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100 static final byte CHRONO_LOCAL_DATE_TIME_TYPE = 2; |
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101 static final byte CHRONO_ZONE_DATE_TIME_TYPE = 3; |
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102 static final byte JAPANESE_DATE_TYPE = 4; |
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103 static final byte JAPANESE_ERA_TYPE = 5; |
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104 static final byte HIJRAH_DATE_TYPE = 6; |
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105 static final byte HIJRAH_ERA_TYPE = 7; |
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106 static final byte MINGUO_DATE_TYPE = 8; |
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107 static final byte MINGUO_ERA_TYPE = 9; |
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108 static final byte THAIBUDDHIST_DATE_TYPE = 10; |
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109 static final byte THAIBUDDHIST_ERA_TYPE = 11; |
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110 |
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111 /** The type being serialized. */ |
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112 private byte type; |
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113 /** The object being serialized. */ |
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114 private Object object; |
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115 |
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116 /** |
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117 * Constructor for deserialization. |
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118 */ |
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119 public Ser() { |
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120 } |
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121 |
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122 /** |
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123 * Creates an instance for serialization. |
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124 * |
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125 * @param type the type |
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126 * @param object the object |
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127 */ |
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128 Ser(byte type, Object object) { |
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129 this.type = type; |
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130 this.object = object; |
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131 } |
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132 |
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133 //----------------------------------------------------------------------- |
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134 /** |
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135 * Implements the {@code Externalizable} interface to write the object. |
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136 * |
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137 * @param out the data stream to write to, not null |
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138 */ |
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139 @Override |
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140 public void writeExternal(ObjectOutput out) throws IOException { |
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141 writeInternal(type, object, out); |
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142 } |
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143 |
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144 private static void writeInternal(byte type, Object object, ObjectOutput out) throws IOException { |
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145 out.writeByte(type); |
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146 switch (type) { |
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147 case CHRONO_TYPE: |
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148 ((Chronology) object).writeExternal(out); |
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149 break; |
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150 case CHRONO_LOCAL_DATE_TIME_TYPE: |
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151 ((ChronoLocalDateTimeImpl<?>) object).writeExternal(out); |
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152 break; |
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153 case CHRONO_ZONE_DATE_TIME_TYPE: |
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154 ((ChronoZonedDateTimeImpl<?>) object).writeExternal(out); |
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155 break; |
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156 case JAPANESE_DATE_TYPE: |
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157 ((JapaneseDate) object).writeExternal(out); |
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158 break; |
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159 case JAPANESE_ERA_TYPE: |
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160 ((JapaneseEra) object).writeExternal(out); |
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161 break; |
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162 case HIJRAH_DATE_TYPE: |
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163 ((HijrahDate) object).writeExternal(out); |
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164 break; |
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165 case HIJRAH_ERA_TYPE: |
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166 ((HijrahEra) object).writeExternal(out); |
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167 break; |
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168 case MINGUO_DATE_TYPE: |
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169 ((MinguoDate) object).writeExternal(out); |
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170 break; |
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171 case MINGUO_ERA_TYPE: |
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172 ((MinguoEra) object).writeExternal(out); |
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173 break; |
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174 case THAIBUDDHIST_DATE_TYPE: |
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175 ((ThaiBuddhistDate) object).writeExternal(out); |
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176 break; |
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177 case THAIBUDDHIST_ERA_TYPE: |
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178 ((ThaiBuddhistEra) object).writeExternal(out); |
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179 break; |
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180 default: |
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181 throw new InvalidClassException("Unknown serialized type"); |
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182 } |
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183 } |
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184 |
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185 //----------------------------------------------------------------------- |
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186 /** |
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187 * Implements the {@code Externalizable} interface to read the object. |
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188 * |
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189 * @param in the data to read, not null |
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190 */ |
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191 @Override |
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192 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { |
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193 type = in.readByte(); |
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194 object = readInternal(type, in); |
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195 } |
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196 |
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197 static Object read(ObjectInput in) throws IOException, ClassNotFoundException { |
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198 byte type = in.readByte(); |
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199 return readInternal(type, in); |
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200 } |
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201 |
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202 private static Object readInternal(byte type, ObjectInput in) throws IOException, ClassNotFoundException { |
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203 switch (type) { |
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204 case CHRONO_TYPE: return Chronology.readExternal(in); |
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205 case CHRONO_LOCAL_DATE_TIME_TYPE: return ChronoLocalDateTimeImpl.readExternal(in); |
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206 case CHRONO_ZONE_DATE_TIME_TYPE: return ChronoZonedDateTimeImpl.readExternal(in); |
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207 case JAPANESE_DATE_TYPE: return JapaneseDate.readExternal(in); |
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208 case JAPANESE_ERA_TYPE: return JapaneseEra.readExternal(in); |
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209 case HIJRAH_DATE_TYPE: return HijrahDate.readExternal(in); |
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210 case HIJRAH_ERA_TYPE: return HijrahEra.readExternal(in); |
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211 case MINGUO_DATE_TYPE: return MinguoDate.readExternal(in); |
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212 case MINGUO_ERA_TYPE: return MinguoEra.readExternal(in); |
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213 case THAIBUDDHIST_DATE_TYPE: return ThaiBuddhistDate.readExternal(in); |
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214 case THAIBUDDHIST_ERA_TYPE: return ThaiBuddhistEra.readExternal(in); |
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215 default: throw new StreamCorruptedException("Unknown serialized type"); |
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216 } |
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217 } |
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218 |
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219 /** |
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220 * Returns the object that will replace this one. |
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221 * |
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222 * @return the read object, should never be null |
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223 */ |
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224 private Object readResolve() { |
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225 return object; |
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226 } |
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227 |
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228 } |