/**
* Use this static method to resolve relative time references and obtain the corresponding
* timestamps (seconds since epoch). Example:<p>
* <pre>
* TimeParser pStart = new TimeParser("now-1month"); // starting time
* TimeParser pEnd = new TimeParser("start+1week"); // ending time
* TimeSpec specStart = pStart.parse();
* TimeSpec specEnd = pEnd.parse();
* long[] ts = TimeSpec.getTimestamps(specStart, specEnd);
* </pre>
* @param spec1 Starting time specification
* @param spec2 Ending time specification
* @return array containing two timestamps (in seconds since epoch)
*/
public static long[] getTimestamps(TimeSpec spec1, TimeSpec spec2)
{
DateTime[] gcs = getTimes(spec1, spec2);
return new long[] {
Util.getTimestamp(gcs[0]), Util.getTimestamp(gcs[1])
};
}
/**
* Constructs TimeParser instance from the given input string.
* @param dateString at-style time specification (read rrdfetch man page
* for the complete explanation)
*/
public TimeParser(String dateString)
{
scanner = new TimeScanner(dateString);
spec = new TimeSpec(dateString);
}
/**
* Use this static method to resolve relative time references and obtain the corresponding
* Calendar objects. Example:<p>
* <pre>
* TimeParser pStart = new TimeParser("now-1month"); // starting time
* TimeParser pEnd = new TimeParser("start+1week"); // ending time
* TimeSpec specStart = pStart.parse();
* TimeSpec specEnd = pEnd.parse();
* GregorianCalendar[] gc = TimeSpec.getTimes(specStart, specEnd);
* </pre>
* @param spec1 Starting time specification
* @param spec2 Ending time specification
* @return Two element array containing Calendar objects
*/
public static DateTime[] getTimes(TimeSpec spec1, TimeSpec spec2)
{
if (spec1.type == TYPE_START || spec2.type == TYPE_END)
{
throw new ArgumentException("Recursive time specifications not allowed");
}
spec1.context = spec2;
spec2.context = spec1;
return new[] {
spec1.getTime(),
spec2.getTime()
};
}