io.netty.handler.codec.http.HttpHeaderDateFormat Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http;
import io.netty.util.concurrent.FastThreadLocal;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* This DateFormat decodes 3 formats of {@link Date}, but only encodes the one,
* the first:
*
* - Sun, 06 Nov 1994 08:49:37 GMT: standard specification, the only one with
* valid generation
* - Sun, 06 Nov 1994 08:49:37 GMT: obsolete specification
* - Sun Nov 6 08:49:37 1994: obsolete specification
*
*/
public final class HttpHeaderDateFormat extends SimpleDateFormat {
private static final long serialVersionUID = -925286159755905325L;
private final SimpleDateFormat format1 = new HttpHeaderDateFormatObsolete1();
private final SimpleDateFormat format2 = new HttpHeaderDateFormatObsolete2();
private static final FastThreadLocal dateFormatThreadLocal =
new FastThreadLocal() {
@Override
protected HttpHeaderDateFormat initialValue() {
return new HttpHeaderDateFormat();
}
};
public static HttpHeaderDateFormat get() {
return dateFormatThreadLocal.get();
}
/**
* Standard date format
* Sun, 06 Nov 1994 08:49:37 GMT -> E, d MMM yyyy HH:mm:ss z
*/
private HttpHeaderDateFormat() {
super("E, dd MMM yyyy HH:mm:ss z", Locale.ENGLISH);
setTimeZone(TimeZone.getTimeZone("GMT"));
}
@Override
public Date parse(String text, ParsePosition pos) {
Date date = super.parse(text, pos);
if (date == null) {
date = format1.parse(text, pos);
}
if (date == null) {
date = format2.parse(text, pos);
}
return date;
}
/**
* First obsolete format
* Sunday, 06-Nov-94 08:49:37 GMT -> E, d-MMM-y HH:mm:ss z
*/
private static final class HttpHeaderDateFormatObsolete1 extends SimpleDateFormat {
private static final long serialVersionUID = -3178072504225114298L;
HttpHeaderDateFormatObsolete1() {
super("E, dd-MMM-yy HH:mm:ss z", Locale.ENGLISH);
setTimeZone(TimeZone.getTimeZone("GMT"));
}
}
/**
* Second obsolete format
*
* Sun Nov 6 08:49:37 1994 -> EEE, MMM d HH:mm:ss yyyy
*/
private static final class HttpHeaderDateFormatObsolete2 extends SimpleDateFormat {
private static final long serialVersionUID = 3010674519968303714L;
HttpHeaderDateFormatObsolete2() {
super("E MMM d HH:mm:ss yyyy", Locale.ENGLISH);
setTimeZone(TimeZone.getTimeZone("GMT"));
}
}
}