package jena;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public class Timer {
	
	long startTime;
	long endTime;
	long totalTime;
	
	DateFormat dateFormat;
	
	
	public Timer() {
		/* Constructor - starts the timer. */
		
		dateFormat = new SimpleDateFormat("mm 'minutes,' ss 'seconds' S 'milliseconds'");
		dateFormat.setTimeZone(TimeZone.getTimeZone("GMT+1"));
		startTime = System.currentTimeMillis();
	}
	
	public String getStartTime() {
		return new Date(startTime).toString();
	}
	
	public String getTotalTime() {
		return dateFormat.format(new Date(totalTime)).toString();
	}

	public String stop (){
		/* This method stops the timer and calculates the result. The result is both printed to screen and returned as a string. */
		
		endTime = System.currentTimeMillis();  
		totalTime = endTime - startTime;		
		System.out.println("Execution time: " + dateFormat.format(new Date(totalTime)));
		return dateFormat.format(new Date(totalTime)).toString();
	}
	
}