Java Regex Time Validate parseTimeString(String str)

Description

parse Time String

License

Open Source License

Declaration

public static long parseTimeString(String str)
            throws NumberFormatException 

Method Source Code

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

import java.util.concurrent.atomic.AtomicLong;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern TIMESTAMP_PATTERN = Pattern
            .compile("^(\\d?\\d)(?::([0-5]?\\d))?(?::([0-5]?\\d))?$");

    public static long parseTimeString(String str)
            throws NumberFormatException {
        AtomicLong millis = new AtomicLong(0);
        long seconds = 0;
        long minutes = 0;
        long hours = 0;

        Matcher m = TIMESTAMP_PATTERN.matcher(str);

        m.find();// w w w  .  j  a va 2 s .co m

        int capturedGroups = 0;
        if (m.group(1) != null)
            capturedGroups++;
        if (m.group(2) != null)
            capturedGroups++;
        if (m.group(3) != null)
            capturedGroups++;

        switch (capturedGroups) {
        case 0:
            throw new IllegalStateException("Unable to match " + str);
        case 1:
            seconds = Integer.parseInt(m.group(1));
            break;
        case 2:
            minutes = Integer.parseInt(m.group(1));
            seconds = Integer.parseInt(m.group(2));
            break;
        case 3:
            hours = Integer.parseInt(m.group(1));
            minutes = Integer.parseInt(m.group(2));
            seconds = Integer.parseInt(m.group(3));
            break;
        }

        minutes = minutes + hours * 60;
        seconds = seconds + minutes * 60;
        millis.set(seconds * 1000);

        return millis.get();
    }
}

Related

1. parseTimePeriod(String period)
2. parseTimePeriod(String s)
3. parseTimeSpan(String timeSpan)
4. parseTimestamp(final String value)
5. parseTimestamp(String s)
6. parseTimeString(String str, TimeUnit unit)
7. parseTimeString(String time)