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annotate src/org/tmatesoft/hg/core/HgDate.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 4252faa556cd
children
rev   line source
211
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
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1 /*
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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
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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
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11 * GNU General Public License for more details.
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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 //
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46 //
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47 /*
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48 * The approach with available-short didn't work out as final timezone still relied
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49 * on daylight saving settings (and added/substracted hour shift according to date supplied)
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50 * E.g. 1218917104000 in zone GMT+2 (hello sample, changeset #2), results in EET timezone and 23 hours instead of 22
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51 *
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52 String[] available = TimeZone.getAvailableIDs(-timezone * 1000);
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53 assert available != null && available.length > 0 : String.valueOf(timezone);
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54 // this is sort of hack, I don't know another way how to get
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55 // abbreviated name from zone offset (other than to have own mapping)
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56 // And I can't use any id, because e.g. zone with id "US/Mountain"
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57 // gives incorrect (according to hg cmdline) result, unlike MST or US/Arizona (all ids for zone -0700)
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58 // use 1125044450000L to see the difference
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59 String shortID = TimeZone.getTimeZone(available[0]).getDisplayName(false, TimeZone.SHORT);
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60 // XXX in fact, might need to handle daylight saving time, but not sure how,
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61 // getTimeZone(GMT-timezone*1000).inDaylightTime()?
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62 TimeZone tz = TimeZone.getTimeZone(shortID);
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63 */
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64 int tz_hours = -timezone/3600;
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65 int tz_mins = timezone % 3600;
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66 String customId = String.format("GMT%+02d:%02d", tz_hours, tz_mins);
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67 TimeZone tz = TimeZone.getTimeZone(customId);
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68 tzone = tz;
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69 }
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70
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71 public long getRawTime() {
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72 return time;
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73 }
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74
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75 /**
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76 * @return zone object by reference, do not alter it (make own copy by {@link TimeZone#clone()}, to modify).
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77 */
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78 public TimeZone getTimeZone() {
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79 return tzone;
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80 }
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81
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82 @Override
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83 public String toString() {
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84 // format the same way hg does
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85 return toString(Locale.US);
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86 }
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87
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88 public String toString(Locale l) {
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89 Calendar c = Calendar.getInstance(getTimeZone());
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90 c.setTimeInMillis(getRawTime());
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91 Formatter f = new Formatter(new StringBuilder(), l);
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92 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c);
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93 return f.out().toString();
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94 }
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95
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96 public int compareTo(HgDate o) {
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97 return (int) (time - o.time);
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98 }
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99
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100 @Override
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101 public boolean equals(Object obj) {
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102 if (false == obj instanceof HgDate) {
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103 return false;
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104 }
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105 HgDate other = (HgDate) obj;
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106 return compareTo(other) == 0;
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107 }
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108
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109 @Override
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110 public int hashCode() {
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111 // copied from java.util.Datge
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112 return (int) time ^ (int) (time >> 32);
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113 }
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114
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115 @Override
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116 protected Object clone() {
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117 try {
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118 return super.clone();
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119 } catch (CloneNotSupportedException ex) {
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120 throw new InternalError(ex.toString());
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121 }
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
122 }
644ee58c9f16 Compound HgDate object to provide flexible access to change date/time information
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
123 }