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) 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.calendar; |
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58 |
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59 import static java.time.temporal.ChronoField.DAY_OF_MONTH; |
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60 import static java.time.temporal.ChronoField.MONTH_OF_YEAR; |
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61 import static java.time.temporal.ChronoField.YEAR; |
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62 |
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63 import java.io.DataInput; |
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64 import java.io.DataOutput; |
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65 import java.io.IOException; |
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66 import java.io.ObjectInputStream; |
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67 import java.io.Serializable; |
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68 import java.time.DateTimeException; |
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69 import java.time.LocalDate; |
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70 import java.time.temporal.ChronoField; |
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71 import java.time.temporal.ChronoLocalDate; |
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72 import java.time.temporal.TemporalField; |
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73 import java.time.temporal.ValueRange; |
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74 import java.util.Calendar; |
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75 import java.util.Objects; |
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76 |
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77 import sun.util.calendar.LocalGregorianCalendar; |
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78 |
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79 /** |
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80 * A date in the Japanese Imperial calendar system. |
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81 * <p> |
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82 * This implements {@code ChronoLocalDate} for the |
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83 * {@linkplain JapaneseChrono Japanese Imperial calendar}. |
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84 * |
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85 * <h3>Specification for implementors</h3> |
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86 * This class is immutable and thread-safe. |
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87 * |
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88 * @since 1.8 |
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89 */ |
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90 final class JapaneseDate |
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91 extends ChronoDateImpl<JapaneseChrono> |
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92 implements ChronoLocalDate<JapaneseChrono>, Serializable { |
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93 // this class is package-scoped so that future conversion to public |
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94 // would not change serialization |
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95 |
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96 /** |
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97 * Serialization version. |
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98 */ |
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99 private static final long serialVersionUID = -305327627230580483L; |
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100 |
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101 /** |
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102 * The underlying ISO local date. |
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103 */ |
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104 private transient final LocalDate isoDate; |
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105 /** |
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106 * The JapaneseEra of this date. |
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107 */ |
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108 private transient JapaneseEra era; |
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109 /** |
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110 * The Japanese imperial calendar year of this date. |
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111 */ |
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112 private transient int yearOfEra; |
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113 |
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114 /** |
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115 * Obtains an instance of {@code JapaneseDate} from the era, year-of-era, |
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116 * month-of-year and day-of-month. |
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117 * |
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118 * @param era the era to represent, not null |
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119 * @param yearOfEra the year-of-era to represent |
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120 * @param month the month-of-year to represent |
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121 * @param dayOfMonth the day-of-month to represent, from 1 to 31 |
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122 * @return the Japanese date, never null |
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123 * @throws DateTimeException if the value of any field is out of range, or |
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124 * if the day-of-month is invalid for the month-year |
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125 */ |
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126 static JapaneseDate of(JapaneseEra era, int yearOfEra, int month, int dayOfMonth) { |
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127 Objects.requireNonNull(era, "era"); |
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128 LocalGregorianCalendar.Date jdate = JapaneseChrono.JCAL.newCalendarDate(null); |
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129 jdate.setEra(era.getPrivateEra()).setDate(yearOfEra, month, dayOfMonth); |
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130 if (!JapaneseChrono.JCAL.validate(jdate)) { |
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131 throw new IllegalArgumentException(); |
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132 } |
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133 LocalDate date = LocalDate.of(jdate.getNormalizedYear(), month, dayOfMonth); |
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134 return new JapaneseDate(era, yearOfEra, date); |
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135 } |
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136 |
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137 //----------------------------------------------------------------------- |
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138 /** |
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139 * Creates an instance from an ISO date. |
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140 * |
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141 * @param isoDate the standard local date, validated not null |
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142 */ |
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143 JapaneseDate(LocalDate isoDate) { |
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144 LocalGregorianCalendar.Date jdate = toPrivateJapaneseDate(isoDate); |
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145 this.era = JapaneseEra.toJapaneseEra(jdate.getEra()); |
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146 this.yearOfEra = jdate.getYear(); |
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147 this.isoDate = isoDate; |
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148 } |
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149 |
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150 /** |
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151 * Constructs a {@code JapaneseDate}. This constructor does NOT validate the given parameters, |
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152 * and {@code era} and {@code year} must agree with {@code isoDate}. |
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153 * |
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154 * @param era the era, validated not null |
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155 * @param year the year-of-era, validated |
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156 * @param isoDate the standard local date, validated not null |
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157 */ |
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158 JapaneseDate(JapaneseEra era, int year, LocalDate isoDate) { |
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159 this.era = era; |
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160 this.yearOfEra = year; |
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161 this.isoDate = isoDate; |
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162 } |
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163 |
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164 //----------------------------------------------------------------------- |
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165 @Override |
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166 public JapaneseChrono getChrono() { |
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167 return JapaneseChrono.INSTANCE; |
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168 } |
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169 |
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170 @Override |
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171 public int lengthOfMonth() { |
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172 return isoDate.lengthOfMonth(); |
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173 } |
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174 |
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175 @Override |
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176 public ValueRange range(TemporalField field) { |
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177 if (field instanceof ChronoField) { |
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178 if (isSupported(field)) { |
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179 ChronoField f = (ChronoField) field; |
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180 switch (f) { |
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181 case DAY_OF_YEAR: |
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182 return actualRange(Calendar.DAY_OF_YEAR); |
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183 case YEAR_OF_ERA: |
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184 return actualRange(Calendar.YEAR); |
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185 } |
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186 return getChrono().range(f); |
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187 } |
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188 throw new DateTimeException("Unsupported field: " + field.getName()); |
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189 } |
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190 return field.doRange(this); |
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191 } |
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192 |
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193 private ValueRange actualRange(int calendarField) { |
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194 Calendar jcal = Calendar.getInstance(JapaneseChrono.LOCALE); |
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195 jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET); |
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196 jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth()); |
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197 return ValueRange.of(jcal.getActualMinimum(calendarField), |
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198 jcal.getActualMaximum(calendarField)); |
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199 } |
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200 |
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201 @Override |
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202 public long getLong(TemporalField field) { |
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203 if (field instanceof ChronoField) { |
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204 switch ((ChronoField) field) { |
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205 case YEAR_OF_ERA: |
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206 return yearOfEra; |
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207 case ERA: |
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208 return era.getValue(); |
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209 case DAY_OF_YEAR: { |
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210 LocalGregorianCalendar.Date jdate = toPrivateJapaneseDate(isoDate); |
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211 return JapaneseChrono.JCAL.getDayOfYear(jdate); |
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212 } |
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213 } |
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214 // TODO: review other fields |
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215 return isoDate.getLong(field); |
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216 } |
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217 return field.doGet(this); |
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218 } |
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219 |
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220 /** |
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221 * Returns a {@code LocalGregorianCalendar.Date} converted from the given {@code isoDate}. |
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222 * |
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223 * @param isoDate the local date, not null |
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224 * @return a {@code LocalGregorianCalendar.Date}, not null |
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225 */ |
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226 private static LocalGregorianCalendar.Date toPrivateJapaneseDate(LocalDate isoDate) { |
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227 LocalGregorianCalendar.Date jdate = JapaneseChrono.JCAL.newCalendarDate(null); |
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228 sun.util.calendar.Era sunEra = JapaneseEra.privateEraFrom(isoDate); |
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229 int year = isoDate.getYear(); |
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230 if (sunEra != null) { |
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231 year -= sunEra.getSinceDate().getYear() - 1; |
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232 } |
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233 jdate.setEra(sunEra).setYear(year).setMonth(isoDate.getMonthValue()).setDayOfMonth(isoDate.getDayOfMonth()); |
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234 JapaneseChrono.JCAL.normalize(jdate); |
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235 return jdate; |
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236 } |
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237 |
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238 //----------------------------------------------------------------------- |
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239 @Override |
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240 public JapaneseDate with(TemporalField field, long newValue) { |
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241 if (field instanceof ChronoField) { |
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242 ChronoField f = (ChronoField) field; |
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243 if (getLong(f) == newValue) { |
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244 return this; |
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245 } |
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246 switch (f) { |
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247 case YEAR_OF_ERA: |
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248 case YEAR: |
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249 case ERA: { |
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250 f.checkValidValue(newValue); |
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251 int nvalue = (int) newValue; |
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252 switch (f) { |
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253 case YEAR_OF_ERA: |
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254 return this.withYear(nvalue); |
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255 case YEAR: |
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256 return with(isoDate.withYear(nvalue)); |
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257 case ERA: { |
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258 return this.withYear(JapaneseEra.of(nvalue), yearOfEra); |
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259 } |
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260 } |
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261 } |
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262 } |
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263 // TODO: review other fields, such as WEEK_OF_YEAR |
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264 return with(isoDate.with(field, newValue)); |
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265 } |
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266 return (JapaneseDate) ChronoLocalDate.super.with(field, newValue); |
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267 } |
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268 |
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269 //----------------------------------------------------------------------- |
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270 /** |
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271 * Returns a copy of this date with the year altered. |
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272 * <p> |
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273 * This method changes the year of the date. |
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274 * If the month-day is invalid for the year, then the previous valid day |
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275 * will be selected instead. |
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276 * <p> |
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277 * This instance is immutable and unaffected by this method call. |
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278 * |
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279 * @param era the era to set in the result, not null |
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280 * @param yearOfEra the year-of-era to set in the returned date |
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281 * @return a {@code JapaneseDate} based on this date with the requested year, never null |
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282 * @throws DateTimeException if {@code year} is invalid |
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283 */ |
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284 private JapaneseDate withYear(JapaneseEra era, int yearOfEra) { |
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285 int year = JapaneseChrono.INSTANCE.prolepticYear(era, yearOfEra); |
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286 return with(isoDate.withYear(year)); |
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287 } |
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288 |
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289 /** |
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290 * Returns a copy of this date with the year-of-era altered. |
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291 * <p> |
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292 * This method changes the year-of-era of the date. |
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293 * If the month-day is invalid for the year, then the previous valid day |
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294 * will be selected instead. |
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295 * <p> |
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296 * This instance is immutable and unaffected by this method call. |
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297 * |
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298 * @param year the year to set in the returned date |
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299 * @return a {@code JapaneseDate} based on this date with the requested year-of-era, never null |
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300 * @throws DateTimeException if {@code year} is invalid |
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301 */ |
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302 private JapaneseDate withYear(int year) { |
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303 return withYear((JapaneseEra) getEra(), year); |
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304 } |
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305 |
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306 //----------------------------------------------------------------------- |
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307 @Override |
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308 JapaneseDate plusYears(long years) { |
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309 return with(isoDate.plusYears(years)); |
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310 } |
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311 |
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312 @Override |
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313 JapaneseDate plusMonths(long months) { |
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314 return with(isoDate.plusMonths(months)); |
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315 } |
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316 |
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317 @Override |
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318 JapaneseDate plusDays(long days) { |
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319 return with(isoDate.plusDays(days)); |
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320 } |
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321 |
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322 private JapaneseDate with(LocalDate newDate) { |
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323 return (newDate.equals(isoDate) ? this : new JapaneseDate(newDate)); |
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324 } |
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325 |
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326 @Override // override for performance |
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327 public long toEpochDay() { |
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328 return isoDate.toEpochDay(); |
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329 } |
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330 |
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331 //------------------------------------------------------------------------- |
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332 @Override // override for performance |
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333 public boolean equals(Object obj) { |
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334 if (this == obj) { |
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335 return true; |
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336 } |
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337 if (obj instanceof JapaneseDate) { |
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338 JapaneseDate otherDate = (JapaneseDate) obj; |
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339 return this.isoDate.equals(otherDate.isoDate); |
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340 } |
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341 return false; |
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342 } |
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343 |
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344 @Override // override for performance |
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345 public int hashCode() { |
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346 return getChrono().getId().hashCode() ^ isoDate.hashCode(); |
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347 } |
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348 |
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349 @Override |
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350 public String toString() { |
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351 if (era == JapaneseEra.SEIREKI) { |
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352 return getChrono().getId() + " " + isoDate.toString(); |
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353 } |
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354 return super.toString(); |
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355 } |
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356 |
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357 //----------------------------------------------------------------------- |
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358 private Object writeReplace() { |
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359 return new Ser(Ser.JAPANESE_DATE_TYPE, this); |
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360 } |
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361 |
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362 void writeExternal(DataOutput out) throws IOException { |
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363 // JapaneseChrono is implicit in the JAPANESE_DATE_TYPE |
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364 out.writeInt(get(YEAR)); |
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365 out.writeByte(get(MONTH_OF_YEAR)); |
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366 out.writeByte(get(DAY_OF_MONTH)); |
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367 } |
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368 |
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369 static ChronoLocalDate<JapaneseChrono> readExternal(DataInput in) throws IOException { |
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370 int year = in.readInt(); |
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371 int month = in.readByte(); |
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372 int dayOfMonth = in.readByte(); |
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373 return JapaneseChrono.INSTANCE.date(year, month, dayOfMonth); |
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374 } |
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375 |
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376 |
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377 } |
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