DateFormatter.java — netty Source File

Source Code

/*
 * Copyright 2016 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:
 *
 *   https://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;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

import io.netty.util.AsciiString;
import io.netty.util.concurrent.FastThreadLocal;

import java.util.BitSet;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * A formatter for HTTP header dates, such as "Expires" and "Date" headers, or "expires" field in "Set-Cookie".
 *
 * On the parsing side, it honors RFC6265 (so it supports RFC1123).
 * Note that:
 * <ul>
 *     <li>Day of week is ignored and not validated</li>
 *     <li>Timezone is ignored, as RFC6265 assumes UTC</li>
 * </ul>
 * If you're looking for a date format that validates day of week, or supports other timezones, consider using
 * java.util.DateTimeFormatter.RFC_1123_DATE_TIME.
 *
 * On the formatting side, it uses a subset of RFC1123 (2 digit day-of-month and 4 digit year) as per RFC2616.
 * This subset supports RFC6265.
 *
 * @see <a href="https://tools.ietf.org/html/rfc6265#section-5.1.1">RFC6265</a> for the parsing side
 * @see <a href="https://tools.ietf.org/html/rfc1123#page-55">RFC1123</a> and
 * <a href="https://tools.ietf.org/html/rfc2616#section-3.3.1">RFC2616</a> for the encoding side.
 */
public final class DateFormatter {

    private static final BitSet DELIMITERS = new BitSet();
    static {
        DELIMITERS.set(0x09);
        for (char c = 0x20; c <= 0x2F; c++) {
            DELIMITERS.set(c);
        }
        for (char c = 0x3B; c <= 0x40; c++) {
            DELIMITERS.set(c);
        }
        for (char c = 0x5B; c <= 0x60; c++) {
            DELIMITERS.set(c);
// ... (389 more lines)