Java Regex Time Validate parseTimeString(String str, TimeUnit unit)

Description

Convert a passed time string (e.g.

License

Apache License

Declaration

private static long parseTimeString(String str, TimeUnit unit) 

Method Source Code

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

import com.google.common.collect.ImmutableMap;

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

public class Main {
    private static final ImmutableMap<String, TimeUnit> timeSuffixes = ImmutableMap.<String, TimeUnit>builder()
            .put("us", TimeUnit.MICROSECONDS).put("ms", TimeUnit.MILLISECONDS).put("s", TimeUnit.SECONDS)
            .put("m", TimeUnit.MINUTES).put("min", TimeUnit.MINUTES).put("h", TimeUnit.HOURS)
            .put("d", TimeUnit.DAYS).build();

    /**//from  w w  w .  j  av a2  s .co m
     * Convert a passed time string (e.g. 50s, 100ms, or 250us) to a time count for
     * internal use. If no suffix is provided a direct conversion is attempted.
     */
    private static long parseTimeString(String str, TimeUnit unit) {
        String lower = str.toLowerCase().trim();

        try {
            Matcher m = Pattern.compile("(-?[0-9]+)([a-z]+)?").matcher(lower);
            if (!m.matches()) {
                throw new NumberFormatException("Failed to parse time string: " + str);
            }

            long val = Long.parseLong(m.group(1));
            String suffix = m.group(2);

            // Check for invalid suffixes
            if (suffix != null && !timeSuffixes.containsKey(suffix)) {
                throw new NumberFormatException("Invalid suffix: \"" + suffix + "\"");
            }

            // If suffix is valid use that, otherwise none was provided and use the default passed
            return unit.convert(val, suffix != null ? timeSuffixes.get(suffix) : unit);
        } catch (NumberFormatException e) {
            String timeError = "Time must be specified as seconds (s), "
                    + "milliseconds (ms), microseconds (us), minutes (m or min), hour (h), or day (d). "
                    + "E.g. 50s, 100ms, or 250us.";

            throw new NumberFormatException(timeError + "\n" + e.getMessage());
        }
    }
}

Related

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