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* Copyright 2004 The Apache Software Foundation
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package com.sun.grizzly.util.http;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.ConcurrentHashMap;
/**
* Utility class to generate HTTP dates.
*
* @author Gustav Trede
* @author Remy Maucherat
*/
public final class FastHttpDateFormat {
protected static final int CACHE_SIZE = 1000;
protected static final TimeZone GMT_TIME_ZONE = TimeZone.getTimeZone("GMT");
/**
* HTTP date format.
*/
protected static final ThreadLocal FORMAT =
new ThreadLocal() {
@Override
protected SimpleDateFormat initialValue() {
SimpleDateFormat f =
new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
f.setTimeZone(GMT_TIME_ZONE);
return f;
}
};
protected final static TimeZone gmtZone = TimeZone.getTimeZone("GMT");
/**
* ThreadLocal for the set of SimpleDateFormat formats to use in getDateHeader().
* GMT timezone - all HTTP dates are on GMT
*/
protected static final ThreadLocal FORMATS =
new ThreadLocal() {
@Override
protected Object initialValue() {
SimpleDateFormat[] f = new SimpleDateFormat[3];
f[0] = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz",
Locale.US);
f[0].setTimeZone(GMT_TIME_ZONE);
f[1] = new SimpleDateFormat("EEEEEE, dd-MMM-yy HH:mm:ss zzz",
Locale.US);
f[1].setTimeZone(GMT_TIME_ZONE);
f[2] = new SimpleDateFormat("EEE MMMM d HH:mm:ss yyyy",
Locale.US);
f[2].setTimeZone(GMT_TIME_ZONE);
return f;
}
};
/**
* Instant on which the currentDate object was generated.
*/
protected static volatile long nextGeneration;
/**
* Current formatted date.
*/
protected static volatile String currentDate;
/**
* Formatter cache.
*/
protected static final ConcurrentHashMap formatCache =
new ConcurrentHashMap(CACHE_SIZE,0.75f,64);
/**
* Parser cache.
*/
protected static final ConcurrentHashMap parseCache =
new ConcurrentHashMap(CACHE_SIZE,0.75f,64);
// --------------------------------------------------------- Public Methods
/**
* Get the current date in HTTP format.
*/
public static final String getCurrentDate() {
long now = System.currentTimeMillis();
if (now > nextGeneration) {
synchronized(FORMAT) {
if (now > nextGeneration) {
nextGeneration = now + 1000;
currentDate = FORMAT.get().format(new Date(now));
}
}
}
return currentDate;
}
/**
* Get the HTTP format of the specified date.
* http spec only requre second precision http://tools.ietf.org/html/rfc2616#page-20
* therefore we dont use the millisecond precision , but second .
* truncation is done in the same way for second precision in SimpleDateFormat:
* (999 millisec. = 0 sec.)
* @param timestamp in millisec
* @param the formater used if cache value was not found
*/
public static final String formatDate(long value, DateFormat threadLocalformat) {
// truncating to second precision
// this way we optimally use the cache to only store needed http values
value = (value/1000)*1000;
Long longValue = value;
String cachedDate = formatCache.get(longValue);
if (cachedDate != null){
return cachedDate;
}
String newDate = null;
Date dateValue = new Date(value);
if (threadLocalformat != null) {
newDate = threadLocalformat.format(dateValue);
} else {
newDate = FORMAT.get().format(dateValue);
}
updateFormatCache(longValue, newDate);
return newDate;
}
/**
* Try to parse the given date as a HTTP date.
*/
public static final long parseDate(final String value,
DateFormat[] threadLocalformats) {
Long cachedDate = parseCache.get(value);
if (cachedDate != null){
return cachedDate;
}
long date ;
if (threadLocalformats != null) {
date = internalParseDate(value, threadLocalformats);
} else {
date = internalParseDate(value, (SimpleDateFormat[])FORMATS.get());
}
if (date != -1) {
updateParseCache(value, date);
}
return date;
}
/**
* Parse date with given formatters.
*/
private static final long internalParseDate (String value, DateFormat[] formats){
for (int i = 0;i < formats.length; i++) {
try {
return formats[i].parse(value).getTime();
} catch (ParseException e) {
return -1;
}
}
return -1;
}
/**
* Update cache.
*/
private static void updateFormatCache(Long key, String value) {
if (value == null) {
return;
}
if (formatCache.size() > CACHE_SIZE) {
formatCache.clear();
}
formatCache.put(key, value);
}
/**
* Update cache.
*/
private static void updateParseCache(String key, Long value) {
if (parseCache.size() > CACHE_SIZE) {
parseCache.clear();
}
parseCache.put(key, value);
}
}
