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Play Framework/Scala example source code file (HttpHeaderDateFormat.java)

This example Play Framework source code file (HttpHeaderDateFormat.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Play Framework (and Scala) source code examples by using tags.

All credit for the original source code belongs to Play Framework; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Play Framework tags/keywords

core, date, e, gmt, hh:mm:ss, httpheaderdateformat, httpheaderdateformatobsolete1, httpheaderdateformatobsolete2, mmm, netty, override, play, play framework, simpledateformat, utility, utils

The HttpHeaderDateFormat.java Play Framework example source code

/*
 * 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 play.core.netty.utils;

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:
 * <ul>
 * <li>Sun, 06 Nov 1994 08:49:37 GMT: standard specification, the only one with
 * valid generation</li>
 * <li>Sun, 06 Nov 1994 08:49:37 GMT: obsolete specification</li>
 * <li>Sun Nov 6 08:49:37 1994: obsolete specification</li>
 * </ul>
 */
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 ThreadLocal<HttpHeaderDateFormat> FORMAT_THREAD_LOCAL =
            new ThreadLocal<HttpHeaderDateFormat>() {
        @Override
        protected HttpHeaderDateFormat initialValue() {
            return new HttpHeaderDateFormat();
        }
    };

    public static HttpHeaderDateFormat get() {
        return FORMAT_THREAD_LOCAL.get();
    }

    /**
     * Standard date format<p>
     * 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<p>
     * 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
     * <p>
     * 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"));
        }
    }
}

Other Play Framework source code examples

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