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package com.firefly.codec.http2.model;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import com.firefly.utils.StringUtils;
/**
* ThreadLocal Date formatters for HTTP style dates.
*/
public class DateGenerator {
private static final TimeZone __GMT = TimeZone.getTimeZone("GMT");
static {
__GMT.setID("GMT");
}
static final String[] DAYS = { "Sat", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
static final String[] MONTHS = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
"Jan" };
private static final ThreadLocal __dateGenerator = new ThreadLocal() {
@Override
protected DateGenerator initialValue() {
return new DateGenerator();
}
};
public final static String __01Jan1970 = DateGenerator.formatDate(0);
/**
* Format HTTP date "EEE, dd MMM yyyy HH:mm:ss 'GMT'"
*
* @param date
* the date in milliseconds
* @return the formatted date
*/
public static String formatDate(long date) {
return __dateGenerator.get().doFormatDate(date);
}
/**
* Format "EEE, dd-MMM-yyyy HH:mm:ss 'GMT'" for cookies
*
* @param buf
* the buffer to put the formatted date into
* @param date
* the date in milliseconds
*/
public static void formatCookieDate(StringBuilder buf, long date) {
__dateGenerator.get().doFormatCookieDate(buf, date);
}
/**
* Format "EEE, dd-MMM-yyyy HH:mm:ss 'GMT'" for cookies
*
* @param date
* the date in milliseconds
* @return the formatted date
*/
public static String formatCookieDate(long date) {
StringBuilder buf = new StringBuilder(28);
formatCookieDate(buf, date);
return buf.toString();
}
private final StringBuilder buf = new StringBuilder(32);
private final GregorianCalendar gc = new GregorianCalendar(__GMT);
/**
* Format HTTP date "EEE, dd MMM yyyy HH:mm:ss 'GMT'"
*
* @param date
* the date in milliseconds
* @return the formatted date
*/
public String doFormatDate(long date) {
buf.setLength(0);
gc.setTimeInMillis(date);
int day_of_week = gc.get(Calendar.DAY_OF_WEEK);
int day_of_month = gc.get(Calendar.DAY_OF_MONTH);
int month = gc.get(Calendar.MONTH);
int year = gc.get(Calendar.YEAR);
int century = year / 100;
year = year % 100;
int hours = gc.get(Calendar.HOUR_OF_DAY);
int minutes = gc.get(Calendar.MINUTE);
int seconds = gc.get(Calendar.SECOND);
buf.append(DAYS[day_of_week]);
buf.append(',');
buf.append(' ');
StringUtils.append2digits(buf, day_of_month);
buf.append(' ');
buf.append(MONTHS[month]);
buf.append(' ');
StringUtils.append2digits(buf, century);
StringUtils.append2digits(buf, year);
buf.append(' ');
StringUtils.append2digits(buf, hours);
buf.append(':');
StringUtils.append2digits(buf, minutes);
buf.append(':');
StringUtils.append2digits(buf, seconds);
buf.append(" GMT");
return buf.toString();
}
/**
* Format "EEE, dd-MMM-yy HH:mm:ss 'GMT'" for cookies
*
* @param buf
* the buffer to format the date into
* @param date
* the date in milliseconds
*/
public void doFormatCookieDate(StringBuilder buf, long date) {
gc.setTimeInMillis(date);
int day_of_week = gc.get(Calendar.DAY_OF_WEEK);
int day_of_month = gc.get(Calendar.DAY_OF_MONTH);
int month = gc.get(Calendar.MONTH);
int year = gc.get(Calendar.YEAR);
year = year % 10000;
int epoch = (int) ((date / 1000) % (60 * 60 * 24));
int seconds = epoch % 60;
epoch = epoch / 60;
int minutes = epoch % 60;
int hours = epoch / 60;
buf.append(DAYS[day_of_week]);
buf.append(',');
buf.append(' ');
StringUtils.append2digits(buf, day_of_month);
buf.append('-');
buf.append(MONTHS[month]);
buf.append('-');
StringUtils.append2digits(buf, year / 100);
StringUtils.append2digits(buf, year % 100);
buf.append(' ');
StringUtils.append2digits(buf, hours);
buf.append(':');
StringUtils.append2digits(buf, minutes);
buf.append(':');
StringUtils.append2digits(buf, seconds);
buf.append(" GMT");
}
}
