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1 /*******************************************************************************
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2
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3 copyright: Copyright (c) 2005 John Chapman. All rights reserved
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4
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5 license: BSD style: $(LICENSE)
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6
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7 version: Mid 2005: Initial release
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8 Apr 2007: reshaped
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9
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10 author: John Chapman, Kris, snoyberg
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11
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12 ******************************************************************************/
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13
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14 module tango.time.chrono.Hebrew;
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15
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16 private import tango.core.Exception;
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17
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18 private import tango.time.chrono.Calendar;
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19
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20
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21
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22 /**
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23 * $(ANCHOR _Hebrew)
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24 * Represents the Hebrew calendar.
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25 */
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26 public class Hebrew : Calendar {
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27
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28 private const uint[14][7] MonthDays = [
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29 // month // year type
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30 [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ],
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31 [ 0, 30, 29, 29, 29, 30, 29, 0, 30, 29, 30, 29, 30, 29 ], // 1
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32 [ 0, 30, 29, 30, 29, 30, 29, 0, 30, 29, 30, 29, 30, 29 ], // 2
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33 [ 0, 30, 30, 30, 29, 30, 29, 0, 30, 29, 30, 29, 30, 29 ], // 3
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34 [ 0, 30, 29, 29, 29, 30, 30, 29, 30, 29, 30, 29, 30, 29 ], // 4
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35 [ 0, 30, 29, 30, 29, 30, 30, 29, 30, 29, 30, 29, 30, 29 ], // 5
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36 [ 0, 30, 30, 30, 29, 30, 30, 29, 30, 29, 30, 29, 30, 29 ] // 6
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37 ];
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38
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39 private const uint YearOfOneAD = 3760;
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40 private const uint DaysToOneAD = cast(int)(YearOfOneAD * 365.2735);
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41
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42 private const uint PartsPerHour = 1080;
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43 private const uint PartsPerDay = 24 * PartsPerHour;
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44 private const uint DaysPerMonth = 29;
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45 private const uint DaysPerMonthFraction = 12 * PartsPerHour + 793;
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46 private const uint PartsPerMonth = DaysPerMonth * PartsPerDay + DaysPerMonthFraction;
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47 private const uint FirstNewMoon = 11 * PartsPerHour + 204;
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48
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49 private uint minYear_ = YearOfOneAD + 1583;
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50 private uint maxYear_ = YearOfOneAD + 2240;
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51
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52 /**
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53 * Represents the current era.
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54 */
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55 public const uint HEBREW_ERA = 1;
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56
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57 /**
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58 * Overridden. Returns a Time value set to the specified date and time in the specified _era.
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59 * Params:
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60 * year = An integer representing the _year.
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61 * month = An integer representing the _month.
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62 * day = An integer representing the _day.
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63 * hour = An integer representing the _hour.
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64 * minute = An integer representing the _minute.
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65 * second = An integer representing the _second.
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66 * millisecond = An integer representing the _millisecond.
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67 * era = An integer representing the _era.
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68 * Returns: A Time set to the specified date and time.
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69 */
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70 public override Time toTime(uint year, uint month, uint day, uint hour, uint minute, uint second, uint millisecond, uint era) {
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71 checkYear(year, era);
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72 return getGregorianTime(year, month, day, hour, minute, second, millisecond);
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73 }
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74
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75 /**
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76 * Overridden. Returns the day of the week in the specified Time.
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77 * Params: time = A Time value.
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78 * Returns: A DayOfWeek value representing the day of the week of time.
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79 */
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80 public override DayOfWeek getDayOfWeek(Time time) {
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81 return cast(DayOfWeek) cast(uint) ((time.ticks / TimeSpan.TicksPerDay + 1) % 7);
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82 }
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83
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84 /**
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85 * Overridden. Returns the day of the month in the specified Time.
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86 * Params: time = A Time value.
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87 * Returns: An integer representing the day of the month of time.
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88 */
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89 public override uint getDayOfMonth(Time time) {
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90 auto year = getYear(time);
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91 auto yearType = getYearType(year);
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92 auto days = getStartOfYear(year) - DaysToOneAD;
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93 auto day = cast(int)(time.ticks / TimeSpan.TicksPerDay) - days;
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94 uint n;
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95 while (n < 12 && day >= MonthDays[yearType][n + 1]) {
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96 day -= MonthDays[yearType][n + 1];
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97 n++;
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98 }
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99 return day + 1;
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100 }
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101
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102 /**
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103 * Overridden. Returns the day of the year in the specified Time.
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104 * Params: time = A Time value.
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105 * Returns: An integer representing the day of the year of time.
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106 */
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107 public override uint getDayOfYear(Time time) {
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108 auto year = getYear(time);
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109 auto days = getStartOfYear(year) - DaysToOneAD;
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110 return (cast(uint)(time.ticks / TimeSpan.TicksPerDay) - days) + 1;
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111 }
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112
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113 /**
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114 * Overridden. Returns the month in the specified Time.
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115 * Params: time = A Time value.
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116 * Returns: An integer representing the month in time.
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117 */
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118 public override uint getMonth(Time time) {
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119 auto year = getYear(time);
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120 auto yearType = getYearType(year);
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121 auto days = getStartOfYear(year) - DaysToOneAD;
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122 auto day = cast(int)(time.ticks / TimeSpan.TicksPerDay) - days;
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123 uint n;
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124 while (n < 12 && day >= MonthDays[yearType][n + 1]) {
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125 day -= MonthDays[yearType][n + 1];
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126 n++;
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127 }
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128 return n + 1;
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129 }
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130
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131 /**
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132 * Overridden. Returns the year in the specified Time.
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133 * Params: time = A Time value.
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134 * Returns: An integer representing the year in time.
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135 */
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136 public override uint getYear(Time time) {
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137 auto day = cast(uint)(time.ticks / TimeSpan.TicksPerDay) + DaysToOneAD;
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138 auto low = minYear_, high = maxYear_;
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139 // Perform a binary search.
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140 while (low <= high) {
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141 auto mid = low + (high - low) / 2;
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142 auto startDay = getStartOfYear(mid);
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143 if (day < startDay)
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144 high = mid - 1;
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145 else if (day >= startDay && day < getStartOfYear(mid + 1))
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146 return mid;
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147 else
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148 low = mid + 1;
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149 }
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150 return low;
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151 }
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152
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153 /**
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154 * Overridden. Returns the era in the specified Time.
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155 * Params: time = A Time value.
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156 * Returns: An integer representing the ear in time.
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157 */
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158 public override uint getEra(Time time) {
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159 return HEBREW_ERA;
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160 }
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161
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162 /**
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163 * Overridden. Returns the number of days in the specified _year and _month of the specified _era.
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164 * Params:
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165 * year = An integer representing the _year.
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166 * month = An integer representing the _month.
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167 * era = An integer representing the _era.
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168 * Returns: The number of days in the specified _year and _month of the specified _era.
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169 */
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170 public override uint getDaysInMonth(uint year, uint month, uint era) {
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171 checkYear(year, era);
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172 return MonthDays[getYearType(year)][month];
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173 }
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174
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175 /**
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176 * Overridden. Returns the number of days in the specified _year of the specified _era.
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177 * Params:
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178 * year = An integer representing the _year.
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179 * era = An integer representing the _era.
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180 * Returns: The number of days in the specified _year in the specified _era.
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181 */
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182 public override uint getDaysInYear(uint year, uint era) {
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183 return getStartOfYear(year + 1) - getStartOfYear(year);
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184 }
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185
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186 /**
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187 * Overridden. Returns the number of months in the specified _year of the specified _era.
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188 * Params:
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189 * year = An integer representing the _year.
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190 * era = An integer representing the _era.
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191 * Returns: The number of months in the specified _year in the specified _era.
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192 */
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193 public override uint getMonthsInYear(uint year, uint era) {
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194 return isLeapYear(year, era) ? 13 : 12;
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195 }
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196
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197 /**
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198 * Overridden. Indicates whether the specified _year in the specified _era is a leap _year.
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199 * Params: year = An integer representing the _year.
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200 * Params: era = An integer representing the _era.
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201 * Returns: true is the specified _year is a leap _year; otherwise, false.
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202 */
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203 public override bool isLeapYear(uint year, uint era) {
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204 checkYear(year, era);
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205 // true if year % 19 == 0, 3, 6, 8, 11, 14, 17
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206 return ((7 * year + 1) % 19) < 7;
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207 }
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208
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209 /**
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210 * $(I Property.) Overridden. Retrieves the list of eras in the current calendar.
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211 * Returns: An integer array representing the eras in the current calendar.
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212 */
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213 public override uint[] eras() {
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214 auto tmp = [HEBREW_ERA];
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215 return tmp.dup;
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216 }
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217
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218 /**
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219 * $(I Property.) Overridden. Retrieves the identifier associated with the current calendar.
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220 * Returns: An integer representing the identifier of the current calendar.
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221 */
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222 public override uint id() {
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223 return HEBREW;
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224 }
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225
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226 private void checkYear(uint year, uint era) {
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227 if ((era != CURRENT_ERA && era != HEBREW_ERA) || (year > maxYear_ || year < minYear_))
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228 throw new IllegalArgumentException("Value was out of range.");
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229 }
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230
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231 private uint getYearType(uint year) {
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232 int yearLength = getStartOfYear(year + 1) - getStartOfYear(year);
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233 if (yearLength > 380)
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234 yearLength -= 30;
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235 switch (yearLength) {
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236 case 353:
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237 // "deficient"
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238 return 1;
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239 case 383:
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240 // "deficient" leap
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241 return 4;
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242 case 354:
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243 // "normal"
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244 return 2;
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245 case 384:
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246 // "normal" leap
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247 return 5;
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248 case 355:
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249 // "complete"
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250 return 3;
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251 case 385:
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252 // "complete" leap
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253 return 6;
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254 default:
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255 break;
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256 }
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257 // Satisfies -w
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258 throw new IllegalArgumentException("Value was not valid.");
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259 }
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260
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261 private uint getStartOfYear(uint year) {
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262 auto months = (235 * year - 234) / 19;
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263 auto fraction = months * DaysPerMonthFraction + FirstNewMoon;
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264 auto day = months * 29 + (fraction / PartsPerDay);
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265 fraction %= PartsPerDay;
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266
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267 auto dayOfWeek = day % 7;
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268 if (dayOfWeek == 2 || dayOfWeek == 4 || dayOfWeek == 6) {
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269 day++;
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270 dayOfWeek = day % 7;
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271 }
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272 if (dayOfWeek == 1 && fraction > 15 * PartsPerHour + 204 && !isLeapYear(year, CURRENT_ERA))
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273 day += 2;
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274 else if (dayOfWeek == 0 && fraction > 21 * PartsPerHour + 589 && isLeapYear(year, CURRENT_ERA))
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275 day++;
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276 return day;
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277 }
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278
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279 private Time getGregorianTime(uint year, uint month, uint day, uint hour, uint minute, uint second, uint millisecond) {
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280 auto yearType = getYearType(year);
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281 auto days = getStartOfYear(year) - DaysToOneAD + day - 1;
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282 for (int i = 1; i <= month; i++)
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283 days += MonthDays[yearType][i - 1];
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284 return Time((days * TimeSpan.TicksPerDay) + getTimeTicks(hour, minute, second)) + TimeSpan.millis(millisecond);
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285 }
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286
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287 }
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288
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