1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.text.DateFormat;
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5 | import java.text.ParseException;
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6 | import java.text.SimpleDateFormat;
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7 | import java.util.ArrayList;
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8 | import java.util.Date;
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9 | import java.util.List;
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10 |
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11 | /**
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12 | * Handles a number of different date formats encountered in OSM. This is built
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13 | * based on similar code in JOSM. This class is not threadsafe, a separate
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14 | * instance must be created per thread.
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15 | *
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16 | * @author Brett Henderson
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17 | */
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18 | public class FallbackDateParser {
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19 |
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20 | private static final String[] formats = {
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21 | "yyyy-MM-dd'T'HH:mm:ss'Z'",
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22 | "yyyy-MM-dd'T'HH:mm:ssZ",
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23 | "yyyy-MM-dd'T'HH:mm:ss",
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24 | "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
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25 | "yyyy-MM-dd'T'HH:mm:ss.SSSZ",
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26 | "yyyy-MM-dd HH:mm:ss",
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27 | "MM/dd/yyyy HH:mm:ss",
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28 | "MM/dd/yyyy'T'HH:mm:ss.SSS'Z'",
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29 | "MM/dd/yyyy'T'HH:mm:ss.SSSZ",
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30 | "MM/dd/yyyy'T'HH:mm:ss.SSS",
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31 | "MM/dd/yyyy'T'HH:mm:ssZ",
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32 | "MM/dd/yyyy'T'HH:mm:ss",
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33 | "yyyy:MM:dd HH:mm:ss"
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34 | };
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35 |
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36 | private List<DateFormat> dateParsers;
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37 | private int activeDateParser;
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38 |
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39 | /**
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40 | * Creates a new instance.
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41 | */
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42 | public FallbackDateParser() {
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43 | // Build a list of candidate date parsers.
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44 | dateParsers = new ArrayList<DateFormat>(formats.length);
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45 | for (int i = 0; i < formats.length; i++) {
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46 | dateParsers.add(new SimpleDateFormat(formats[i]));
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47 | }
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48 |
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49 | // We haven't selected a date parser yet.
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50 | activeDateParser = -1;
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51 | }
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52 |
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53 | /**
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54 | * Attempts to parse the specified date.
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55 | *
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56 | * @param date
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57 | * The date to parse.
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58 | * @return The date.
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59 | * @throws ParseException
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60 | * Occurs if the date does not match any of the supported date
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61 | * formats.
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62 | */
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63 | public Date parse(String date) throws ParseException {
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64 | String correctedDate;
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65 |
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66 | // Try to fix ruby's broken xmlschema - format
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67 | // Replace this:
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68 | // 2007-02-12T18:43:01+00:00
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69 | // With this:
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70 | // 2007-02-12T18:43:01+0000
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71 | if (date.length() == 25 && date.charAt(22) == ':') {
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72 | correctedDate = date.substring(0, 22) + date.substring(23, 25);
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73 | } else {
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74 | correctedDate = date;
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75 | }
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76 |
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77 | // If we have previously successfully used a date parser, we'll try it
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78 | // first.
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79 | if (activeDateParser >= 0) {
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80 | try {
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81 | return dateParsers.get(activeDateParser).parse(correctedDate);
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82 | } catch (ParseException e) {
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83 | // The currently active parser didn't work, so we must clear it
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84 | // and find a new appropriate parser.
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85 | activeDateParser = -1;
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86 | }
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87 | }
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88 |
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89 | // Try the date parsers one by one until a suitable format is found.
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90 | for (int i = 0; i < dateParsers.size(); i++) {
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91 | try {
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92 | Date result;
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93 |
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94 | // Attempt to parse with the current parser, if successful we
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95 | // store its index for next time.
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96 | result = dateParsers.get(i).parse(correctedDate);
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97 | activeDateParser = i;
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98 |
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99 | return result;
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100 |
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101 | } catch (ParseException pe) {
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102 | // Ignore parsing errors and try the next pattern.
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103 | }
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104 | }
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105 |
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106 | throw new ParseException("The date string (" + date + ") could not be parsed.", 0);
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107 | }
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108 | }
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