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/**
*
*/
package org.reprap.utilities;
import java.text.DecimalFormat;
import java.util.Date;
/**
* @author Adrian
*
* I bet there's a system utility somewhere to do this...
*
*/
public class Timer {
/**
* Time at the start
*/
private long t0 = 0;
/**
* Time now
*/
private long t = 0;
/**
* Time since last call
*/
private long delta;
/**
* for 3 d.p.
*/
private DecimalFormat threeDec;
/**
* Static single instance to hold all times
*/
static private Timer tim = null;
/**
* Constructor just needs to create a single
* instance for initialiseIfNeedBe(String e)
*
*/
private Timer() {}
/**
* What o'clock have you?
*
*/
static private void newTime()
{
long last = tim.t;
Date d = new Date();
tim.t = d.getTime() - tim.t0;
tim.delta = tim.t - last;
}
/**
* Check if we've been initialised and initialise if needed
* @param e
*/
static private void initialiseIfNeedBe()
{
if(tim != null) return;
tim = new Timer();
newTime();
tim.t0 = tim.t;
tim.threeDec = new DecimalFormat("0.000");
tim.threeDec.setGroupingUsed(false);
}
/**
* Get a double as a 3 d.p. string
* @param v
* @return
*/
static private String d3dp(double v)
{
return tim.threeDec.format(v);
}
/**
* Generate a timestamp
* @return
*/
static public String stamp()
{
initialiseIfNeedBe();
newTime();
return " [" + d3dp(tim.t*0.001) + "s/" + tim.delta + "ms]";
}
/**
* Get the time from the start in seconds
* @return
*/
static public double elapsed()
{
initialiseIfNeedBe();
Date d = new Date();
long e = d.getTime() - tim.t0;
return 0.001*(double)e;
}
}
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