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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
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11
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12 ******************************************************************************/
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13
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14 module tango.time.chrono.Hijri;
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15
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16 private import tango.time.chrono.Calendar;
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17
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18
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19 /**
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20 * $(ANCHOR _Hijri)
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21 * Represents the Hijri calendar.
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22 */
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23 public class Hijri : Calendar {
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24
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25 private static const uint[] DAYS_TO_MONTH = [ 0, 30, 59, 89, 118, 148, 177, 207, 236, 266, 295, 325, 355 ];
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26
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27 /**
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28 * Represents the current era.
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29 */
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30 public const uint HIJRI_ERA = 1;
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31
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32 /**
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33 * Overridden. Returns a Time value set to the specified date and time in the specified _era.
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34 * Params:
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35 * year = An integer representing the _year.
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36 * month = An integer representing the _month.
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37 * day = An integer representing the _day.
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38 * hour = An integer representing the _hour.
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39 * minute = An integer representing the _minute.
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40 * second = An integer representing the _second.
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41 * millisecond = An integer representing the _millisecond.
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42 * era = An integer representing the _era.
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43 * Returns: A Time set to the specified date and time.
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44 */
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45 public override Time toTime(uint year, uint month, uint day, uint hour, uint minute, uint second, uint millisecond, uint era) {
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46 return Time((daysSinceJan1(year, month, day) - 1) * TimeSpan.TicksPerDay + getTimeTicks(hour, minute, second)) + TimeSpan.millis(millisecond);
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47 }
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48
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49 /**
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50 * Overridden. Returns the day of the week in the specified Time.
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51 * Params: time = A Time value.
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52 * Returns: A DayOfWeek value representing the day of the week of time.
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53 */
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54 public override DayOfWeek getDayOfWeek(Time time) {
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55 return cast(DayOfWeek) (cast(uint) (time.ticks / TimeSpan.TicksPerDay + 1) % 7);
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56 }
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57
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58 /**
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59 * Overridden. Returns the day of the month in the specified Time.
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60 * Params: time = A Time value.
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61 * Returns: An integer representing the day of the month of time.
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62 */
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63 public override uint getDayOfMonth(Time time) {
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64 return extractPart(time.ticks, DatePart.Day);
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65 }
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66
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67 /**
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68 * Overridden. Returns the day of the year in the specified Time.
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69 * Params: time = A Time value.
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70 * Returns: An integer representing the day of the year of time.
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71 */
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72 public override uint getDayOfYear(Time time) {
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73 return extractPart(time.ticks, DatePart.DayOfYear);
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74 }
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75
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76 /**
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77 * Overridden. Returns the day of the year in the specified Time.
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78 * Params: time = A Time value.
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79 * Returns: An integer representing the day of the year of time.
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80 */
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81 public override uint getMonth(Time time) {
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82 return extractPart(time.ticks, DatePart.Month);
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83 }
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84
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85 /**
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86 * Overridden. Returns the year in the specified Time.
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87 * Params: time = A Time value.
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88 * Returns: An integer representing the year in time.
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89 */
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90 public override uint getYear(Time time) {
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91 return extractPart(time.ticks, DatePart.Year);
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92 }
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93
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94 /**
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95 * Overridden. Returns the era in the specified Time.
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96 * Params: time = A Time value.
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97 * Returns: An integer representing the ear in time.
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98 */
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99 public override uint getEra(Time time) {
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100 return HIJRI_ERA;
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101 }
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102
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103 /**
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104 * Overridden. Returns the number of days in the specified _year and _month of the specified _era.
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105 * Params:
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106 * year = An integer representing the _year.
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107 * month = An integer representing the _month.
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108 * era = An integer representing the _era.
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109 * Returns: The number of days in the specified _year and _month of the specified _era.
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110 */
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111 public override uint getDaysInMonth(uint year, uint month, uint era) {
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112 if (month == 12)
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113 return isLeapYear(year, CURRENT_ERA) ? 30 : 29;
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114 return (month % 2 == 1) ? 30 : 29;
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115 }
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116
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117 /**
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118 * Overridden. Returns the number of days in the specified _year of the specified _era.
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119 * Params:
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120 * year = An integer representing the _year.
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121 * era = An integer representing the _era.
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122 * Returns: The number of days in the specified _year in the specified _era.
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123 */
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124 public override uint getDaysInYear(uint year, uint era) {
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125 return isLeapYear(year, era) ? 355 : 354;
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126 }
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127
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128 /**
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129 * Overridden. Returns the number of months in the specified _year of the specified _era.
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130 * Params:
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131 * year = An integer representing the _year.
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132 * era = An integer representing the _era.
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133 * Returns: The number of months in the specified _year in the specified _era.
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134 */
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135 public override uint getMonthsInYear(uint year, uint era) {
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136 return 12;
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137 }
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138
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139 /**
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140 * Overridden. Indicates whether the specified _year in the specified _era is a leap _year.
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141 * Params: year = An integer representing the _year.
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142 * Params: era = An integer representing the _era.
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143 * Returns: true is the specified _year is a leap _year; otherwise, false.
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144 */
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145 public override bool isLeapYear(uint year, uint era) {
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146 return (14 + 11 * year) % 30 < 11;
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147 }
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148
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149 /**
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150 * $(I Property.) Overridden. Retrieves the list of eras in the current calendar.
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151 * Returns: An integer array representing the eras in the current calendar.
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152 */
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153 public override uint[] eras() {
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154 auto tmp = [HIJRI_ERA];
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155 return tmp.dup;
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156 }
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157
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158 /**
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159 * $(I Property.) Overridden. Retrieves the identifier associated with the current calendar.
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160 * Returns: An integer representing the identifier of the current calendar.
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161 */
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162 public override uint id() {
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163 return HIJRI;
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164 }
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165
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166 private long daysToYear(uint year) {
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167 int cycle = ((year - 1) / 30) * 30;
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168 int remaining = year - cycle - 1;
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169 long days = ((cycle * 10631L) / 30L) + 227013L;
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170 while (remaining > 0) {
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171 days += 354 + (isLeapYear(remaining, CURRENT_ERA) ? 1 : 0);
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172 remaining--;
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173 }
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174 return days;
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175 }
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176
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177 private long daysSinceJan1(uint year, uint month, uint day) {
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178 return cast(long)(daysToYear(year) + DAYS_TO_MONTH[month - 1] + day);
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179 }
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180
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181 private int extractPart(long ticks, DatePart part) {
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182 long days = TimeSpan(ticks).days + 1;
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183 int year = cast(int)(((days - 227013) * 30) / 10631) + 1;
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184 long daysUpToYear = daysToYear(year);
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185 long daysInYear = getDaysInYear(year, CURRENT_ERA);
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186 if (days < daysUpToYear) {
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187 daysUpToYear -= daysInYear;
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188 year--;
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189 }
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190 else if (days == daysUpToYear) {
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191 year--;
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192 daysUpToYear -= getDaysInYear(year, CURRENT_ERA);
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193 }
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194 else if (days > daysUpToYear + daysInYear) {
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195 daysUpToYear += daysInYear;
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196 year++;
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197 }
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198
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199 if (part == DatePart.Year)
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200 return year;
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201
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202 days -= daysUpToYear;
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203 if (part == DatePart.DayOfYear)
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204 return cast(int)days;
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205
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206 int month = 1;
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207 while (month <= 12 && days > DAYS_TO_MONTH[month - 1])
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208 month++;
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209 month--;
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210 if (part == DatePart.Month)
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211 return month;
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212
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213 return cast(int)(days - DAYS_TO_MONTH[month - 1]);
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214 }
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215
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216 }
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217
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