//
// ElapsedTimer.java
//
// Created by Steven R. Loomis on 11/11/2005.
// Copyright 2005-2006 IBM. All rights reserved.
//
package com.ibm.icu.dev.test.util;
import java.util.*;
import com.ibm.icu.text.NumberFormat;
import com.ibm.icu.text.RuleBasedNumberFormat;
import com.ibm.icu.text.MessageFormat;
/**
* Simple stopwatch timer.
* Usage: { ElapsedTimer et = new ElapsedTimer();
* do_some_stuff;
* System.out.println("It took " + et + " to do stuff."); }
*
* Advanced: { ElapsedTimer et = new ElapsedTimer("Thing2's time: {0}"); // messageformat pattern
* do_thing_2();
* System.out.println(et.toString()); }
*
* More advanced: NumberFormat and/or MessageFormat can be provided in the constructor
*/
public final class ElapsedTimer {
/**
* Convenience method to print the elasped time (in milliseconds)
*/
public static String elapsedTime(long start, long end) {
return diffTime(getFormat(), start, end);
}
public static String elapsedTime(long start) {
return diffTime(getFormat(), start, System.currentTimeMillis());
}
// class
private long startTime = System.currentTimeMillis();
private NumberFormat myDurationFormat = null;
private MessageFormat myMsgFormat = null;
public ElapsedTimer() {
}
public ElapsedTimer(MessageFormat aMsgFmt) {
myMsgFormat = aMsgFmt;
}
public ElapsedTimer(NumberFormat aNumFmt) {
myDurationFormat = aNumFmt;
}
public ElapsedTimer(MessageFormat aMsgFmt, NumberFormat aNumFmt) {
myMsgFormat = aMsgFmt;
myDurationFormat = aNumFmt;
}
public ElapsedTimer(String pattern) {
myMsgFormat = new MessageFormat(pattern);
}
public ElapsedTimer(String pattern, NumberFormat aNumFmt) {
myMsgFormat = new MessageFormat(pattern);
myDurationFormat = aNumFmt;
}
/**
* @return elapsed time in seconds since object creation
*/
public final String toString() {
long endTime = System.currentTimeMillis();
String duration = diffTime(myDurationFormat, startTime, endTime);
if(myMsgFormat == null) {
return duration;
} else {
return myMsgFormat.format(new Object[] {duration});
}
}
private static NumberFormat gFormat = null;
private static NumberFormat getFormat() {
if(gFormat == null) {
gFormat = new RuleBasedNumberFormat(Locale.US,
RuleBasedNumberFormat.DURATION);
}
return gFormat;
}
private static String diffTime(NumberFormat fmt, long start, long end) {
if(fmt==null) {
fmt = getFormat();
}
synchronized(fmt) {
long age = end - start;
double diff = (double)age;
diff = diff/(double)1000.0; // millis per second
return fmt.format(diff);
}
}
}