1 | /**
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2 | * @copyright (c) 2016, Philipp Thürwächter & Pattrick Hüper
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3 | * @copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
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4 | * @license BSD-3-Clause (see LICENSE in the root directory of this source tree)
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5 | */
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6 |
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7 | import {MathUtil} from '../MathUtil';
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8 |
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9 | import {Duration} from '../Duration';
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10 | import {YearConstants} from '../YearConstants';
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11 | import {TemporalUnit} from './TemporalUnit';
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12 |
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13 | /**
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14 | * A standard set of date periods units.
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15 | *
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16 | * This set of units provide unit-based access to manipulate a date, time or date-time.
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17 | * The standard set of units can be extended by implementing {@link TemporalUnit}.
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18 | *
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19 | * These units are intended to be applicable in multiple calendar systems.
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20 | * For example, most non-ISO calendar systems define units of years, months and days,
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21 | * just with slightly different rules.
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22 | * The documentation of each unit explains how it operates.
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23 | *
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24 | * ### Static properties:
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25 | *
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26 | * - `ChronoUnit.CENTURIES`: Unit that represents the concept of a century. For the ISO calendar
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27 | * system, it is equal to 100 years.
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28 | *
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29 | * - `ChronoUnit.DAYS`: Unit that represents the concept of a day. For the ISO calendar system, it
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30 | * is the standard day from midnight to midnight. The estimated duration of a day is 24 Hours.
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31 | *
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32 | * - `ChronoUnit.DECADES`: Unit that represents the concept of a decade. For the ISO calendar system,
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33 | * it is equal to 10 years.
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34 | *
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35 | * - `ChronoUnit.ERAS`: Unit that represents the concept of an era. The ISO calendar system doesn't
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36 | * have eras thus it is impossible to add an era to a date or date-time. The estimated duration of the
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37 | * era is artificially defined as 1,000,000,000 Years.
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38 | *
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39 | * - `ChronoUnit.FOREVER`: Artificial unit that represents the concept of forever. This is primarily
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40 | * used with {@link TemporalField} to represent unbounded fields such as the year or era. The
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41 | * estimated duration of the era is artificially defined as the largest duration supported by
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42 | * {@link Duration}.
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43 | *
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44 | * - `ChronoUnit.HALF_DAYS`: Unit that represents the concept of half a day, as used in AM/PM. For
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45 | * the ISO calendar system, it is equal to 12 hours.
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46 | *
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47 | * - `ChronoUnit.HOURS`: Unit that represents the concept of an hour. For the ISO calendar system,
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48 | * it is equal to 60 minutes.
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49 | *
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50 | * - `ChronoUnit.MICROS`: Unit that represents the concept of a microsecond. For the ISO calendar
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51 | * system, it is equal to the 1,000,000th part of the second unit.
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52 | *
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53 | * - `ChronoUnit.MILLENNIA`: Unit that represents the concept of a millennium. For the ISO calendar
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54 | * system, it is equal to 1,000 years.
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55 | *
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56 | * - `ChronoUnit.MILLIS`: Unit that represents the concept of a millisecond. For the ISO calendar
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57 | * system, it is equal to the 1000th part of the second unit.
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58 | *
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59 | * - `ChronoUnit.MINUTES`: Unit that represents the concept of a minute. For the ISO calendar system,
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60 | * it is equal to 60 seconds.
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61 | *
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62 | * - `ChronoUnit.MONTHS`: Unit that represents the concept of a month. For the ISO calendar system,
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63 | * the length of the month varies by month-of-year. The estimated duration of a month is one twelfth
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64 | * of 365.2425 Days.
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65 | *
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66 | * - `ChronoUnit.NANOS`: Unit that represents the concept of a nanosecond, the smallest supported unit
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67 | * of time. For the ISO calendar system, it is equal to the 1,000,000,000th part of the second unit.
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68 | *
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69 | * - `ChronoUnit.SECONDS`: Unit that represents the concept of a second. For the ISO calendar system,
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70 | * it is equal to the second in the SI system of units, except around a leap-second.
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71 | *
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72 | * - `ChronoUnit.WEEKS`: Unit that represents the concept of a week. For the ISO calendar system,
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73 | * it is equal to 7 Days.
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74 | *
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75 | * - `ChronoUnit.YEARS`: Unit that represents the concept of a year. For the ISO calendar system, it
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76 | * is equal to 12 months. The estimated duration of a year is 365.2425 Days.
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77 | */
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78 | export class ChronoUnit extends TemporalUnit {
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79 |
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80 | /**
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81 | *
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82 | * @param {String} name
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83 | * @param {Duration} estimatedDuration
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84 | * @private
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85 | */
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86 | constructor (name, estimatedDuration) {
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87 | super();
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88 | this._name = name;
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89 | this._duration = estimatedDuration;
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90 | }
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91 |
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92 | //-----------------------------------------------------------------------
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93 | /**
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94 | * @return {Duration} the duration of this unit, which may be an estimate.
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95 | */
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96 | duration() {
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97 | return this._duration;
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98 | }
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99 |
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100 | /**
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101 | * @return {boolean} `true` if the duration is estimated, `false` if accurate.
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102 | */
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103 | isDurationEstimated() {
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104 | return this.isDateBased() || this === ChronoUnit.FOREVER;
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105 | }
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106 |
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107 | //-----------------------------------------------------------------------
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108 | /**
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109 | * @return {boolean} `true` if date unit, `false` if a time unit.
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110 | */
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111 | isDateBased() {
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112 | return this.compareTo(ChronoUnit.DAYS) >= 0 && this !== ChronoUnit.FOREVER;
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113 | }
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114 |
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115 | /**
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116 | * Checks if this unit is a time unit.
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117 | *
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118 | * @return {boolean} `true` if time unit, `false` if a date unit.
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119 | */
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120 | isTimeBased() {
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121 | return this.compareTo(ChronoUnit.DAYS) < 0;
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122 | }
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123 |
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124 | //-----------------------------------------------------------------------
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125 | /**
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126 | * @param {!Temporal} temporal the temporal object to check.
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127 | * @return {boolean} `true` if the unit is supported.
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128 | */
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129 | isSupportedBy(temporal) {
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130 | if (this === ChronoUnit.FOREVER) {
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131 | return false;
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132 | }
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133 | /* TODO: classes not implemented yet */
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134 | /*
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135 | if (temporal instanceof ChronoLocalDate) {
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136 | return isDateBased();
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137 | }
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138 | if (temporal instanceof ChronoLocalDateTime || temporal instanceof ChronoZonedDateTime) {
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139 | return true;
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140 | }
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141 | */
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142 | try {
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143 | temporal.plus(1, this);
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144 | return true;
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145 | } catch (e) {
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146 | try {
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147 | temporal.plus(-1, this);
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148 | return true;
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149 | } catch (e2) {
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150 | return false;
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151 | }
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152 | }
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153 | }
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154 |
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155 | /**
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156 | * @param {!Temporal} dateTime the temporal object to adjust.
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157 | * @param {number} periodToAdd the period of this unit to add, positive or negative.
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158 | * @return {Temporal} the adjusted temporal object.
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159 | * @throws DateTimeException if the period cannot be added.
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160 | */
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161 | addTo(temporal, amount) {
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162 | return temporal.plus(amount, this);
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163 | }
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164 |
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165 | //-----------------------------------------------------------------------
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166 | /**
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167 | * @param {!Temporal} temporal1 the base temporal object.
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168 | * @param {!Temporal} temporal2 the other temporal object.
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169 | * @return {number} the period between temporal1 and temporal2 in terms of this unit;
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170 | * positive if temporal2 is later than temporal1, negative if earlier.
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171 | * @throws DateTimeException if the period cannot be calculated.
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172 | * @throws ArithmeticException if numeric overflow occurs.
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173 | */
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174 | between(temporal1, temporal2) {
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175 | return temporal1.until(temporal2, this);
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176 | }
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177 |
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178 | //-----------------------------------------------------------------------
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179 | toString() {
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180 | return this._name;
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181 | }
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182 |
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183 | /**
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184 | * Compares this ChronoUnit to the specified {@link TemporalUnit}.
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185 | *
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186 | * The comparison is based on the total length of the durations.
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187 | *
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188 | * @param {!TemporalUnit} other the other unit to compare to.
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189 | * @return the comparator value, negative if less, positive if greater.
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190 | */
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191 | compareTo(other) {
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192 | return this.duration().compareTo(other.duration());
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193 | }
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194 |
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195 | }
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196 |
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197 | export function _init() {
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198 | /**
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199 | * Unit that represents the concept of a nanosecond, the smallest supported unit of time.
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200 | * For the ISO calendar system, it is equal to the 1,000,000,000th part of the second unit.
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201 | */
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202 | ChronoUnit.NANOS = new ChronoUnit('Nanos', Duration.ofNanos(1));
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203 | /**
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204 | * Unit that represents the concept of a microsecond.
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205 | * For the ISO calendar system, it is equal to the 1,000,000th part of the second unit.
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206 | */
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207 | ChronoUnit.MICROS = new ChronoUnit('Micros', Duration.ofNanos(1000));
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208 | /**
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209 | * Unit that represents the concept of a millisecond.
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210 | * For the ISO calendar system, it is equal to the 1000th part of the second unit.
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211 | */
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212 | ChronoUnit.MILLIS = new ChronoUnit('Millis', Duration.ofNanos(1000000));
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213 | /**
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214 | * Unit that represents the concept of a second.
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215 | * For the ISO calendar system, it is equal to the second in the SI system
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216 | * of units, except around a leap-second.
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217 | */
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218 | ChronoUnit.SECONDS = new ChronoUnit('Seconds', Duration.ofSeconds(1));
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219 | /**
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220 | * Unit that represents the concept of a minute.
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221 | * For the ISO calendar system, it is equal to 60 seconds.
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222 | */
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223 | ChronoUnit.MINUTES = new ChronoUnit('Minutes', Duration.ofSeconds(60));
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224 | /**
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225 | * Unit that represents the concept of an hour.
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226 | * For the ISO calendar system, it is equal to 60 minutes.
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227 | */
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228 | ChronoUnit.HOURS = new ChronoUnit('Hours', Duration.ofSeconds(3600));
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229 | /**
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230 | * Unit that represents the concept of half a day, as used in AM/PM.
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231 | * For the ISO calendar system, it is equal to 12 hours.
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232 | */
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233 | ChronoUnit.HALF_DAYS = new ChronoUnit('HalfDays', Duration.ofSeconds(43200));
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234 | /**
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235 | * Unit that represents the concept of a day.
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236 | * For the ISO calendar system, it is the standard day from midnight to midnight.
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237 | * The estimated duration of a day is 24 hours.
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238 | *
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239 | * When used with other calendar systems it must correspond to the day defined by
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240 | * the rising and setting of the Sun on Earth. It is not required that days begin
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241 | * at midnight - when converting between calendar systems, the date should be
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242 | * equivalent at midday.
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243 | */
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244 | ChronoUnit.DAYS = new ChronoUnit('Days', Duration.ofSeconds(86400));
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245 | /**
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246 | * Unit that represents the concept of a week.
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247 | * For the ISO calendar system, it is equal to 7 days.
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248 | *
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249 | * When used with other calendar systems it must correspond to an integral number of days.
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250 | */
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251 | ChronoUnit.WEEKS = new ChronoUnit('Weeks', Duration.ofSeconds(7 * 86400));
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252 | /**
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253 | * Unit that represents the concept of a month.
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254 | * For the ISO calendar system, the length of the month varies by month-of-year.
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255 | * The estimated duration of a month is one twelfth of 365.2425 days.
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256 | *
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257 | * When used with other calendar systems it must correspond to an integral number of days.
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258 | */
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259 | ChronoUnit.MONTHS = new ChronoUnit('Months', Duration.ofSeconds(31556952 / 12));
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260 | /**
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261 | * Unit that represents the concept of a year.
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262 | * For the ISO calendar system, it is equal to 12 months.
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263 | * The estimated duration of a year is 365.2425 days.
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264 | *
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265 | * When used with other calendar systems it must correspond to an integral number of days
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266 | * or months roughly equal to a year defined by the passage of the Earth around the Sun.
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267 | */
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268 | ChronoUnit.YEARS = new ChronoUnit('Years', Duration.ofSeconds(31556952));
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269 | /**
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270 | * Unit that represents the concept of a decade.
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271 | * For the ISO calendar system, it is equal to 10 years.
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272 | *
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273 | * When used with other calendar systems it must correspond to an integral number of days
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274 | * and is normally an integral number of years.
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275 | */
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276 | ChronoUnit.DECADES = new ChronoUnit('Decades', Duration.ofSeconds(31556952 * 10));
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277 | /**
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278 | * Unit that represents the concept of a century.
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279 | * For the ISO calendar system, it is equal to 100 years.
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280 | *
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281 | * When used with other calendar systems it must correspond to an integral number of days
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282 | * and is normally an integral number of years.
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283 | */
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284 | ChronoUnit.CENTURIES = new ChronoUnit('Centuries', Duration.ofSeconds(31556952 * 100));
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285 | /**
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286 | * Unit that represents the concept of a millennium.
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287 | * For the ISO calendar system, it is equal to 1000 years.
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288 | *
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289 | * When used with other calendar systems it must correspond to an integral number of days
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290 | * and is normally an integral number of years.
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291 | */
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292 | ChronoUnit.MILLENNIA = new ChronoUnit('Millennia', Duration.ofSeconds(31556952 * 1000));
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293 | /**
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294 | * Unit that represents the concept of an era.
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295 | * The ISO calendar system doesn't have eras thus it is impossible to add
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296 | * an era to a date or date-time.
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297 | * The estimated duration of the era is artificially defined as {Year.MAX_VALUE} + 1.
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298 | *
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299 | * When used with other calendar systems there are no restrictions on the unit.
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300 | */
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301 | ChronoUnit.ERAS = new ChronoUnit('Eras', Duration.ofSeconds(31556952 * (YearConstants.MAX_VALUE + 1)));
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302 | /**
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303 | * Artificial unit that represents the concept of forever.
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304 | * This is primarily used with {@link TemporalField} to represent unbounded fields
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305 | * such as the year or era.
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306 | * The estimated duration of the era is artificially defined as the largest duration
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307 | * supported by {@link Duration}.
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308 | */
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309 | ChronoUnit.FOREVER = new ChronoUnit('Forever', Duration.ofSeconds(MathUtil.MAX_SAFE_INTEGER, 999999999));
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310 | }
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