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* Copyright 2004 The Apache Software Foundation
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package org.glassfish.grizzly.http.util;
import java.util.Date;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.ParsePosition;
/**
* Fast date formatter that caches recently formatted date information
* and uses it to avoid too-frequent calls to the underlying
* formatter. Note: breaks fieldPosition param of format(Date,
* StringBuffer, FieldPosition). If you care about the field
* position, call the underlying DateFormat directly.
*
* @author Stan Bailes
* @author Alex Chaffee
**/
public class FastDateFormat extends DateFormat {
private static final long serialVersionUID = -1L;
final DateFormat df;
long lastSec = -1;
final StringBuffer sb = new StringBuffer();
final transient FieldPosition fp = new FieldPosition(DateFormat.MILLISECOND_FIELD);
public FastDateFormat(DateFormat df) {
this.df = df;
}
public Date parse(String text, ParsePosition pos) {
return df.parse(text, pos);
}
/**
* Note: breaks functionality of fieldPosition param. Also:
* there's a bug in SimpleDateFormat with "S" and "SS", use "SSS"
* instead if you want a msec field.
**/
public StringBuffer format(Date date, StringBuffer toAppendTo,
FieldPosition fieldPosition) {
long dt = date.getTime();
long ds = dt / 1000;
if (ds != lastSec) {
sb.setLength(0);
df.format(date, sb, fp);
lastSec = ds;
} else {
// munge current msec into existing string
int ms = (int)(dt % 1000);
int pos = fp.getEndIndex();
int begin = fp.getBeginIndex();
if (pos > 0) {
if (pos > begin)
sb.setCharAt(--pos, Character.forDigit(ms % 10, 10));
ms /= 10;
if (pos > begin)
sb.setCharAt(--pos, Character.forDigit(ms % 10, 10));
ms /= 10;
if (pos > begin)
sb.setCharAt(--pos, Character.forDigit(ms % 10, 10));
}
}
toAppendTo.append(sb.toString());
return toAppendTo;
}
/**
* Note: breaks functionality of fieldPosition param. Also:
* there's a bug in SimpleDateFormat with "S" and "SS", use "SSS"
* instead if you want a msec field.
**/
public StringBuilder format(Date date, StringBuilder toAppendTo,
FieldPosition fieldPosition) {
long dt = date.getTime();
long ds = dt / 1000;
if (ds != lastSec) {
sb.setLength(0);
df.format(date, sb, fp);
lastSec = ds;
} else {
// munge current msec into existing string
int ms = (int)(dt % 1000);
int pos = fp.getEndIndex();
int begin = fp.getBeginIndex();
if (pos > 0) {
if (pos > begin)
sb.setCharAt(--pos, Character.forDigit(ms % 10, 10));
ms /= 10;
if (pos > begin)
sb.setCharAt(--pos, Character.forDigit(ms % 10, 10));
ms /= 10;
if (pos > begin)
sb.setCharAt(--pos, Character.forDigit(ms % 10, 10));
}
}
toAppendTo.append(sb.toString());
return toAppendTo;
}
// public static void main(String[] args) {
// String format = "yyyy-MM-dd HH:mm:ss.SSS";
// if (args.length > 0)
// format = args[0];
// SimpleDateFormat sdf = new SimpleDateFormat(format);
// FastDateFormat fdf = new FastDateFormat(sdf);
// Date d = new Date();
//
// d.setTime(1); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(20); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(500); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(543); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(999); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(1050); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(2543); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(12345); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
// d.setTime(12340); System.out.println(fdf.format(d) + '\t' + sdf.format(d));
//
// final int reps = 100000;
// {
// long start = System.currentTimeMillis();
// for (int i = 0; i < reps; i++) {
// d.setTime(System.currentTimeMillis());
// fdf.format(d);
// }
// long elap = System.currentTimeMillis() - start;
// System.out.println("fast: " + elap + " elapsed");
// System.out.println(fdf.format(d));
// }
// {
// long start = System.currentTimeMillis();
// for (int i = 0; i < reps; i++) {
// d.setTime(System.currentTimeMillis());
// sdf.format(d);
// }
// long elap = System.currentTimeMillis() - start;
// System.out.println("slow: " + elap + " elapsed");
// System.out.println(sdf.format(d));
// }
// }
}
