Java Number Convert convertDurationToMillis(String time)

Description

Calls the correct functions to convert the time period to milliseconds

License

Apache License

Parameter

Parameter	Description
time	a parameter

Return

milliseconds

Declaration

private static long convertDurationToMillis(String time) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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

public class Main {
    /**//from w ww.ja v  a  2  s. c o m
     * Calls the correct functions to convert the time period to milliseconds
     * @param time
     * @return milliseconds
     */
    private static long convertDurationToMillis(String time) {

        if (time == null || (time != null && "".equals(time))) {
            return 0;
        }

        BigDecimal milliseconds = null;

        // String to be scanned to find the pattern.
        String line = time;
        String pattern = "(\\d+.\\d+|\\d+)(\\w+)";

        // Create a Pattern object
        Pattern r = Pattern.compile(pattern);

        // Now create matcher object.
        Matcher m = r.matcher(line);

        if (m.find()) {
            String duration = m.group(1);
            String timeScale = m.group(2).toLowerCase();

            switch (timeScale) {
            case "s":
                milliseconds = convertSecondsToMillis(new BigDecimal(duration));
                break;
            case "m":
                milliseconds = convertMinutesToMillis(new BigDecimal(duration));
                break;
            case "h":
                milliseconds = convertHoursToMillis(new BigDecimal(duration));
                break;
            case "d":
                milliseconds = convertDaysToMillis(new BigDecimal(duration));
                break;
            case "w":
                milliseconds = convertWeeksToMillis(new BigDecimal(duration));
                break;
            }
        }

        return milliseconds.longValueExact();
    }

    /**
     * Number of second = # of seconds *  1000 millis
     * @param seconds
     * @return seconds converted to milliseconds
     */
    private static BigDecimal convertSecondsToMillis(BigDecimal seconds) {
        return seconds.multiply(new BigDecimal(1000));
    }

    /**
     * Number of minutes = # of minutes * 60 seconds * 1000 millis
     * @param minutes
     * @return minutes converted to milliseconds
     */
    private static BigDecimal convertMinutesToMillis(BigDecimal minutes) {
        return minutes.multiply(convertSecondsToMillis(new BigDecimal(60)));
    }

    /**
     * Number of hours = # of hours * 60 seconds * 60 minutes * 1000 millis
     * @param hours
     * @return hours converted to milliseconds
     */
    private static BigDecimal convertHoursToMillis(BigDecimal hours) {
        return hours.multiply(convertMinutesToMillis(new BigDecimal(60)));
    }

    /**
     * Number of  days = Number of days * 24 hours * 60 seconds * 60 minutes * 1000 millis
     * @param days
     * @return days converted to milliseconds
     */
    private static BigDecimal convertDaysToMillis(BigDecimal days) {
        return days.multiply(convertHoursToMillis(new BigDecimal(24)));
    }

    /**
     * Number of weeks = # of weeks * 7 day * 24 hours * 60 seconds * 60 minutes * 1000 millis
     * @param weeks
     * @return weeks converted to milliseconds
     */
    private static BigDecimal convertWeeksToMillis(BigDecimal weeks) {
        return weeks.multiply(convertDaysToMillis(new BigDecimal(7)));
    }
}

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