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