1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.layer.geoimage;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.text.ParseException;
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7 | import java.util.Objects;
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8 |
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9 | public final class Timezone {
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10 |
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11 | static final Timezone ZERO = new Timezone(0.0);
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12 | private final double timezone;
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13 |
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14 | Timezone(double hours) {
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15 | this.timezone = hours;
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16 | }
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17 |
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18 | public double getHours() {
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19 | return timezone;
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20 | }
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21 |
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22 | String formatTimezone() {
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23 | StringBuilder ret = new StringBuilder();
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24 |
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25 | double timezone = this.timezone;
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26 | if (timezone < 0) {
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27 | ret.append('-');
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28 | timezone = -timezone;
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29 | } else {
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30 | ret.append('+');
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31 | }
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32 | ret.append((long) timezone).append(':');
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33 | int minutes = (int) ((timezone % 1) * 60);
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34 | if (minutes < 10) {
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35 | ret.append('0');
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36 | }
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37 | ret.append(minutes);
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38 |
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39 | return ret.toString();
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40 | }
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41 |
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42 | static Timezone parseTimezone(String timezone) throws ParseException {
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43 |
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44 | if (timezone.isEmpty())
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45 | return ZERO;
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46 |
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47 | String error = tr("Error while parsing timezone.\nExpected format: {0}", "+H:MM");
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48 |
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49 | char sgnTimezone = '+';
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50 | StringBuilder hTimezone = new StringBuilder();
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51 | StringBuilder mTimezone = new StringBuilder();
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52 | int state = 1; // 1=start/sign, 2=hours, 3=minutes.
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53 | for (int i = 0; i < timezone.length(); i++) {
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54 | char c = timezone.charAt(i);
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55 | switch (c) {
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56 | case ' ':
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57 | if (state != 2 || hTimezone.length() != 0)
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58 | throw new ParseException(error, i);
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59 | break;
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60 | case '+':
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61 | case '-':
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62 | if (state == 1) {
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63 | sgnTimezone = c;
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64 | state = 2;
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65 | } else
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66 | throw new ParseException(error, i);
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67 | break;
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68 | case ':':
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69 | case '.':
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70 | if (state == 2) {
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71 | state = 3;
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72 | } else
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73 | throw new ParseException(error, i);
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74 | break;
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75 | case '0':
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76 | case '1':
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77 | case '2':
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78 | case '3':
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79 | case '4':
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80 | case '5':
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81 | case '6':
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82 | case '7':
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83 | case '8':
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84 | case '9':
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85 | switch (state) {
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86 | case 1:
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87 | case 2:
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88 | state = 2;
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89 | hTimezone.append(c);
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90 | break;
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91 | case 3:
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92 | mTimezone.append(c);
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93 | break;
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94 | default:
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95 | throw new ParseException(error, i);
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96 | }
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97 | break;
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98 | default:
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99 | throw new ParseException(error, i);
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100 | }
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101 | }
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102 |
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103 | int h = 0;
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104 | int m = 0;
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105 | try {
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106 | h = Integer.parseInt(hTimezone.toString());
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107 | if (mTimezone.length() > 0) {
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108 | m = Integer.parseInt(mTimezone.toString());
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109 | }
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110 | } catch (NumberFormatException nfe) {
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111 | // Invalid timezone
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112 | throw (ParseException) new ParseException(error, 0).initCause(nfe);
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113 | }
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114 |
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115 | if (h > 12 || m > 59)
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116 | throw new ParseException(error, 0);
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117 | else
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118 | return new Timezone((h + m / 60.0) * (sgnTimezone == '-' ? -1 : 1));
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119 | }
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120 |
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121 | @Override
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122 | public boolean equals(Object o) {
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123 | if (this == o) return true;
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124 | if (!(o instanceof Timezone)) return false;
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125 | Timezone timezone1 = (Timezone) o;
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126 | return Double.compare(timezone1.timezone, timezone) == 0;
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127 | }
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128 |
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129 | @Override
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130 | public int hashCode() {
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131 | return Objects.hash(timezone);
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132 | }
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133 | }
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