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package com.earth2me.essentials;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class ExecuteTimer
{
private final transient List<ExecuteRecord> times;
private final transient DecimalFormat decimalFormat = new DecimalFormat("#0.000", DecimalFormatSymbols.getInstance(Locale.US));
public ExecuteTimer()
{
times = new ArrayList<ExecuteRecord>();
}
public void start()
{
times.clear();
mark("start");
}
public void mark(final String label)
{
if (!times.isEmpty() || "start".equals(label))
{
times.add(new ExecuteRecord(label, System.nanoTime()));
}
}
public String end()
{
final StringBuilder output = new StringBuilder();
output.append("execution time: ");
String mark;
long time0 = 0;
long time1 = 0;
long time2 = 0;
double duration;
for (ExecuteRecord pair : times)
{
mark = (String)pair.getMark();
time2 = (Long)pair.getTime();
if (time1 > 0)
{
duration = (time2 - time1)/1000000.0;
output.append(mark).append(": ").append(decimalFormat.format(duration)).append("ms - ");
}
else
{
time0 = time2;
}
time1 = time2;
}
duration = (time1 - time0)/1000000.0;
output.append("Total: ").append(decimalFormat.format(duration)).append("ms");
times.clear();
return output.toString();
}
private static class ExecuteRecord
{
private final String mark;
private final long time;
public ExecuteRecord(final String mark, final long time)
{
this.mark = mark;
this.time = time;
}
public String getMark()
{
return mark;
}
public long getTime()
{
return time;
}
}
}
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