[3719] | 1 | // License: GPL. For details, see LICENSE file.
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[374] | 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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[1169] | 15 | *
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[374] | 16 | * @author Brett Henderson
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| 17 | */
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| 18 | public class FallbackDateParser {
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[1169] | 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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[7005] | 44 | dateParsers = new ArrayList<>(formats.length);
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[6104] | 45 | for (String format : formats) {
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| 46 | dateParsers.add(new SimpleDateFormat(format));
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[1169] | 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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[374] | 108 | }
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