Java Regex Time Validate parseTimeString(String time)

Description

Parses the given time String and returns the corresponding time in milliseconds

License

Open Source License

Parameter

Parameter	Description
time	a parameter

Exception

Parameter	Description
NullPointerException	if time is null

Declaration

public static long parseTimeString(String time) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  . j  ava  2  s.  c o m*/
 * #%L
 * Intuit Tank Api
 * %%
 * Copyright (C) 2011 - 2015 Intuit Inc.
 * %%
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * #L%
 */

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

public class Main {
    private static final Pattern SIMPLE = Pattern.compile(
            "([+-])?((\\d+)[Dd])?\\s*((\\d+)[Hh])?\\s*((\\d+)[Mm])?\\s*((\\d+)[Ss])?\\s*((\\d+)([Mm][Ss])?)?");
    private static final int SIM_SGN = 1;
    private static final int SIM_DAY = 3;
    private static final int SIM_HOU = 5;
    private static final int SIM_MIN = 7;
    private static final int SIM_SEC = 9;
    private static final int SIM_MS = 11;
    private static final long SEC_MS = 1000;
    private static final long MIN_MS = 60 * SEC_MS;
    private static final long HOU_MS = 60 * MIN_MS;
    private static final long DAY_MS = 24 * HOU_MS;

    /**
     * Parses the given time String and returns the corresponding time in milliseconds
     * 
     * @param time
     * @return
     * 
     * @throws NullPointerException
     *             if time is null
     */
    public static long parseTimeString(String time) {
        String trimmed = time.trim();
        long result = 0;
        if (trimmed.length() > 0) {
            Matcher mat = SIMPLE.matcher(trimmed);
            if (mat.matches()) {
                int days = (mat.group(SIM_DAY) != null) ? Integer.parseInt(mat.group(SIM_DAY)) : 0;
                int hours = (mat.group(SIM_HOU) != null) ? Integer.parseInt(mat.group(SIM_HOU)) : 0;
                int min = (mat.group(SIM_MIN) != null) ? Integer.parseInt(mat.group(SIM_MIN)) : 0;
                int sec = (mat.group(SIM_SEC) != null) ? Integer.parseInt(mat.group(SIM_SEC)) : 0;
                int ms = (mat.group(SIM_MS) != null) ? Integer.parseInt(mat.group(SIM_MS)) : 0;
                long r = days * DAY_MS + hours * HOU_MS + min * MIN_MS + sec * SEC_MS + ms;
                if (mat.group(SIM_SGN) != null && mat.group(SIM_SGN).equals("-")) {
                    r = -r;
                }
                result = r;
            } else if ("*".equals(trimmed) || "+*".equals(trimmed)) {
                // positive infinity
                result = Long.MAX_VALUE;
            } else if ("-*".equals(trimmed)) {
                // negative infinity
                result = Long.MIN_VALUE;
            } else {
                throw new RuntimeException("Error parsing time string: [ " + time + " ]");
            }
        }
        return result;
    }
}

Related

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