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annotate src/org/tmatesoft/hg/core/HgDate.java @ 211:644ee58c9f16

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Compound HgDate object to provide flexible access to change date/time information
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 29 Apr 2011 02:37:52 +0200
parents
children 4252faa556cd
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211
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
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11 * GNU General Public License for more details.
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.core;
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18
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19 import java.util.Calendar;
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20 import java.util.Formatter;
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21 import java.util.Locale;
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22 import java.util.TimeZone;
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23
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24 /**
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25 * Compound object to keep time and time zone of a change. Time zone is not too useful unless you'd like to indicate where
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26 * the change was made (original <em>hg</em> shows date of a change in its original time zone)
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public final class HgDate implements Comparable<HgDate>, Cloneable {
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32 private final long time;
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33 private final TimeZone tzone;
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34
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35
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36 /**
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37 * @param millis UTC, milliseconds
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38 * @param timezone zone offset in seconds, UTC - local == timezone. I.e. positive in the Western Hemisphere.
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39 */
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40 public HgDate(long millis, int timezone) {
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41 time = millis;
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42 // @see http://pydoc.org/2.5.1/time.html time.timezone -- difference in seconds between UTC and local standard time
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43 // UTC - local = timezone. local = UTC - timezone
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44 // In Java, timezone is positive right of Greenwich, UTC+timezone = local
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45 String[] available = TimeZone.getAvailableIDs(-timezone * 1000);
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
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46 assert available != null && available.length > 0 : String.valueOf(timezone);
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47 // this is sort of hach, I don't know another way how to get
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48 // abbreviated name from zone offset (other than to have own mapping)
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49 // And I can't use any id, because e.g. zone with id "US/Mountain"
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50 // gives incorrect (according to hg cmdline) result, unlike MST or US/Arizona (all ids for zone -0700)
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51 // use 1125044450000L to see the difference
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52 String shortID = TimeZone.getTimeZone(available[0]).getDisplayName(false, TimeZone.SHORT);
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53 // XXX in fact, might need to handle daylight saving time, but not sure how,
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54 // getTimeZone(GMT-timezone*1000).inDaylightTime()?
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55 TimeZone tz = TimeZone.getTimeZone(shortID);
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56 tzone = tz;
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57 }
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58
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59 public long getRawTime() {
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60 return time;
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61 }
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62
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63 /**
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64 * @return zone object by reference, do not alter it (make own copy by {@link TimeZone#clone()}, to modify).
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65 */
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66 public TimeZone getTimeZone() {
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67 return tzone;
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68 }
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69
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70 @Override
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71 public String toString() {
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72 // format the same way hg does
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73 return toString(Locale.US);
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74 }
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75
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76 public String toString(Locale l) {
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77 Calendar c = Calendar.getInstance(getTimeZone());
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78 c.setTimeInMillis(getRawTime());
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79 Formatter f = new Formatter(new StringBuilder(), l);
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80 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c);
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81 return f.out().toString();
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82 }
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83
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84 public int compareTo(HgDate o) {
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85 return (int) (time - o.time);
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86 }
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87
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88 @Override
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89 public boolean equals(Object obj) {
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90 if (false == obj instanceof HgDate) {
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91 return false;
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92 }
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93 HgDate other = (HgDate) obj;
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94 return compareTo(other) == 0;
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95 }
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96
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97 @Override
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98 public int hashCode() {
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99 // copied from java.util.Datge
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100 return (int) time ^ (int) (time >> 32);
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101 }
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102
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103 @Override
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104 protected Object clone() {
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105 try {
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106 return super.clone();
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107 } catch (CloneNotSupportedException ex) {
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108 throw new InternalError(ex.toString());
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109 }
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110 }
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111 }