Java Regex Date Vaidate parseDateDiff(String time, boolean future)

Description

parse Date Diff

License

Open Source License

Declaration

public static long parseDateDiff(String time, boolean future) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.Calendar;
import java.util.GregorianCalendar;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static long parseDateDiff(String time, boolean future) throws Exception {
        Pattern timePattern = Pattern.compile("(?:([0-9]+)\\s*y[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*mo[a-z]*[,\\s]*)?"
                + "(?:([0-9]+)\\s*w[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*d[a-z]*[,\\s]*)?"
                + "(?:([0-9]+)\\s*h[a-z]*[,\\s]*)?" + "(?:([0-9]+)\\s*m[a-z]*[,\\s]*)?"
                + "(?:([0-9]+)\\s*(?:s[a-z]*)?)?", Pattern.CASE_INSENSITIVE);
        Matcher m = timePattern.matcher(time);
        int hours = 0;
        int minutes = 0;
        int seconds = 0;
        boolean found = false;
        while (m.find()) {
            if (m.group() == null || m.group().isEmpty())
                continue;

            for (int i = 0; i < m.groupCount(); i++) {
                if (m.group(i) != null && !m.group(i).isEmpty()) {
                    found = true;/*from  w w  w.ja va2 s  .  c  o  m*/
                    break;
                }
            }
            if (found) {
                if (m.group(5) != null && !m.group(5).isEmpty())
                    hours = Integer.parseInt(m.group(5));
                if (m.group(6) != null && !m.group(6).isEmpty())
                    minutes = Integer.parseInt(m.group(6));
                if (m.group(7) != null && !m.group(7).isEmpty())
                    seconds = Integer.parseInt(m.group(7));
                break;
            }
        }
        if (!found)
            throw new Exception("illegalDate");
        Calendar c = new GregorianCalendar();
        if (hours > 0)
            c.add(Calendar.HOUR_OF_DAY, hours * (future ? 1 : -1));
        if (minutes > 0)
            c.add(Calendar.MINUTE, minutes * (future ? 1 : -1));
        if (seconds > 0)
            c.add(Calendar.SECOND, seconds * (future ? 1 : -1));
        Calendar max = new GregorianCalendar();
        max.add(Calendar.YEAR, 10);
        if (c.after(max))
            return max.getTimeInMillis();
        return c.getTimeInMillis();
    }
}

Related

1. parseDate(String dateStr)
2. parseDate(String entry)
3. parseDate(String text)
4. parseDateDiff(final String time)
5. parseDateDiff(String time)
6. parseDateOffset(String time)