teichmann@5844: /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
teichmann@5844:  * Software engineering by Intevation GmbH
sascha@2357:  *
teichmann@5992:  * This file is Free Software under the GNU AGPL (>=v3)
teichmann@5844:  * and comes with ABSOLUTELY NO WARRANTY! Check out the
teichmann@5992:  * documentation coming with Dive4Elements River for details.
sascha@2357:  */
sascha@2357: 
teichmann@8187: package org.dive4elements.river.backend.utils;
teichmann@5844: 
sascha@2357: import java.util.Date;
sascha@2357: import java.util.Calendar;
sascha@2357: 
sascha@2357: import java.util.regex.Pattern;
sascha@2357: import java.util.regex.Matcher;
sascha@2357: 
sascha@2357: public final class DateGuesser {
sascha@2357:     public static final String [] MONTH = {
sascha@2357:         "jan", "feb", "mrz", "apr", "mai", "jun",
sascha@2357:         "jul", "aug", "sep", "okt", "nov", "dez"
sascha@2357:     };
sascha@2357: 
sascha@2357:     public static final int guessMonth(String s) {
sascha@2357:         s = s.toLowerCase();
sascha@2357:         for (int i = 0; i < MONTH.length; ++i)
sascha@2357:             if (MONTH[i].equals(s)) {
sascha@2357:                 return i;
sascha@2357:             }
sascha@2357:         return -1;
sascha@2357:     }
sascha@2357: 
sascha@2357:     public static final Pattern YYYY_MM_DD =
sascha@2357:         Pattern.compile("^(\\d{4})-(\\d{2})-(\\d{2})$");
sascha@2357: 
sascha@2357:     public static final Pattern DD_MM_YYYY =
sascha@2357:         Pattern.compile("^(\\d{1,2})\\.(\\d{1,2})\\.(\\d{2,4})$");
sascha@2357: 
sascha@2357:     public static final Pattern MMM_YYYY =
sascha@2357:         Pattern.compile("^(\\d{0,2})\\.?(\\w{3})\\.?(\\d{2,4})$");
sascha@2357: 
sascha@2357:     public static final Pattern GARBAGE_YYYY =
sascha@2357:         Pattern.compile("^\\D*(\\d{2,4})$");
sascha@2357: 
sascha@2357:     public static final Pattern YYYY_MM_DDThh_mm =
sascha@2357:         Pattern.compile("^(\\d{4})-(\\d{2})-(\\d{2})T(\\d{2}):(\\d{2})$");
sascha@2357: 
sascha@2357:     public static final Pattern YYYY_MM_DDThh_mm_ss =
tom@8856:         Pattern.compile(
tom@8856:             "^(\\d{4})-(\\d{2})-(\\d{2})T(\\d{2}):(\\d{2}):(\\d{2})$");
sascha@2357: 
sascha@2357:     public static final Pattern DD_MM_YYYYThh_mm =
tom@8856:         Pattern.compile(
tom@8856:             "^(\\d{1,2})\\.(\\d{1,2})\\.(\\d{2,4})T(\\d{1,2}):(\\d{2})$");
sascha@2357: 
sascha@2357:     public static final Pattern DD_MM_YYYYThh_mm_ss =
tom@8856:         Pattern.compile("^(\\d{1,2})\\.(\\d{1,2})\\.(\\d{2,4})"
tom@8856:             + "T(\\d{1,2}):(\\d{2}):(\\d{2})$");
sascha@2357: 
felix@4763:     public static final Pattern DDMMYY =
teichmann@5895:         Pattern.compile("^(\\d{2})(\\d{2})(\\d{2})$");
felix@4763: 
sascha@2357:     private DateGuesser() {
sascha@2357:     }
sascha@2357: 
sascha@2357:     public static final int calendarMonth(String month) {
sascha@2357:         return calendarMonth(Integer.parseInt(month));
sascha@2357:     }
sascha@2357: 
sascha@2357:     public static final int calendarMonth(int month) {
sascha@2357:         return Math.max(Math.min(month-1, 11), 0);
sascha@2357:     }
sascha@2357: 
felix@4764:     /**
felix@4764:      * Guess date by trying all different patterns.
felix@4764:      * Throws IllegalArgumentException if not able to guess.
felix@4764:      * @param s The date to be guessed (e.g. 11.02.2001).
felix@4764:      * @return the parsed Date.
felix@4764:      */
sascha@2357:     public static Date guessDate(String s) {
sascha@2357:         if (s == null || (s = s.trim()).length() == 0) {
sascha@2357:             throw new IllegalArgumentException();
sascha@2357:         }
sascha@2357: 
sascha@2357:         Matcher m;
sascha@2357: 
sascha@2357:         m = YYYY_MM_DD.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year  = m.group(1);
sascha@2357:             String month = m.group(2);
sascha@2357:             String day   = m.group(3);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year),
sascha@2357:                 calendarMonth(month),
sascha@2357:                 Integer.parseInt(day),
sascha@2357:                 12, 0, 0);
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
sascha@2357:         m = DD_MM_YYYY.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year  = m.group(3);
sascha@2357:             String month = m.group(2);
sascha@2357:             String day   = m.group(1);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year) + (year.length() == 2 ? 1900 : 0),
sascha@2357:                 calendarMonth(month),
teichmann@5895:                 Integer.parseInt(day),
sascha@2357:                 12, 0, 0);
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
sascha@2357:         m = MMM_YYYY.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             int month = guessMonth(m.group(2));
sascha@2357:             if (month >= 0) {
sascha@2357:                 Calendar cal = Calendar.getInstance();
sascha@2357:                 String year = m.group(3);
sascha@2357:                 String day  = m.group(1);
teichmann@5895:                 cal.clear();
sascha@2357:                 cal.set(
sascha@2357:                     Integer.parseInt(year) + (year.length() == 2 ? 1900 : 0),
sascha@2357:                     month,
sascha@2357:                     day.length() == 0 ? 15 : Integer.parseInt(day),
sascha@2357:                     12, 0, 0);
sascha@2357:                 return cal.getTime();
sascha@2357:             }
sascha@2357:         }
sascha@2357: 
sascha@2357:         m = YYYY_MM_DDThh_mm.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year = m.group(1);
sascha@2357:             String month = m.group(2);
sascha@2357:             String day = m.group(3);
sascha@2357:             String hour = m.group(4);
sascha@2357:             String minute = m.group(5);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year),
sascha@2357:                 calendarMonth(month),
sascha@2357:                 Integer.parseInt(day),
sascha@2357:                 Integer.parseInt(hour),
sascha@2357:                 Integer.parseInt(minute),
sascha@2357:                 0
sascha@2357:             );
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
sascha@2357:         m = YYYY_MM_DDThh_mm_ss.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year = m.group(1);
sascha@2357:             String month = m.group(2);
sascha@2357:             String day = m.group(3);
sascha@2357:             String hour = m.group(4);
sascha@2357:             String minute = m.group(5);
sascha@2357:             String second = m.group(6);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year),
sascha@2357:                 calendarMonth(month),
sascha@2357:                 Integer.parseInt(day),
sascha@2357:                 Integer.parseInt(hour),
sascha@2357:                 Integer.parseInt(minute),
sascha@2357:                 Integer.parseInt(second)
sascha@2357:             );
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
sascha@2357:         m = DD_MM_YYYYThh_mm.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year = m.group(3);
sascha@2357:             String month = m.group(2);
sascha@2357:             String day = m.group(1);
sascha@2357:             String hour = m.group(4);
sascha@2357:             String minute = m.group(5);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year) + (year.length() == 2 ? 1900 : 0),
sascha@2357:                 calendarMonth(month),
sascha@2357:                 Integer.parseInt(day),
sascha@2357:                 Integer.parseInt(hour),
sascha@2357:                 Integer.parseInt(minute),
sascha@2357:                 0
sascha@2357:             );
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
sascha@2357:         m = DD_MM_YYYYThh_mm_ss.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year = m.group(3);
sascha@2357:             String month = m.group(2);
sascha@2357:             String day = m.group(1);
sascha@2357:             String hour = m.group(4);
sascha@2357:             String minute = m.group(5);
sascha@2357:             String second = m.group(6);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year) + (year.length() == 2 ? 1900 : 0),
sascha@2357:                 calendarMonth(month),
sascha@2357:                 Integer.parseInt(day),
sascha@2357:                 Integer.parseInt(hour),
sascha@2357:                 Integer.parseInt(minute),
sascha@2357:                 Integer.parseInt(second)
sascha@2357:             );
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
felix@4763:         m = DDMMYY.matcher(s);
felix@4763: 
felix@4763:         if (m.matches()) {
felix@4763:             Calendar cal = Calendar.getInstance();
felix@4763:             String day   = m.group(1);
felix@4763:             String month = m.group(2);
teichmann@4770:             String yearS = m.group(3);
teichmann@4770:             int year = Integer.parseInt(yearS);
teichmann@4770: 
teichmann@4770:             if (year <= cal.get(Calendar.YEAR) % 100) {
felix@4763:                 year += 2000;
felix@4763:             }
felix@4763:             else {
felix@4763:                 year += 1900;
felix@4763:             }
teichmann@5895:             cal.clear();
felix@4763:             cal.set(
felix@4763:                 year,
felix@4763:                 Integer.parseInt(month),  // month
felix@4763:                 Integer.parseInt(day), // day
felix@4763:                 12, 0, 0);
felix@4763:             return cal.getTime();
felix@4763:         }
felix@4763: 
sascha@2357:         m = GARBAGE_YYYY.matcher(s);
sascha@2357: 
sascha@2357:         if (m.matches()) {
sascha@2357:             Calendar cal = Calendar.getInstance();
sascha@2357:             String year = m.group(1);
teichmann@5895:             cal.clear();
sascha@2357:             cal.set(
sascha@2357:                 Integer.parseInt(year) + (year.length() == 2 ? 1900 : 0),
sascha@2357:                 5,  // month
sascha@2357:                 15, // day
sascha@2357:                 12, 0, 0);
sascha@2357:             return cal.getTime();
sascha@2357:         }
sascha@2357: 
sascha@2357:         throw new IllegalArgumentException();
sascha@2357:     }
sascha@2357: 
sascha@2357:     public static void main(String [] args) {
sascha@2357:         for (int i = 0; i < args.length; ++i) {
sascha@2357:             System.out.println(args[i] + ": " + guessDate(args[i]));
sascha@2357:         }
sascha@2357:     }
sascha@2357: }
sascha@2357: // end of file