001// ***************************************************************************************************************************
002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
003// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
005// * with the License.  You may obtain a copy of the License at                                                              *
006// *                                                                                                                         *
007// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
008// *                                                                                                                         *
009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an  *
010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.http;
014
015import org.apache.juneau.internal.*;
016
017/**
018 * Category of headers that consist of a single HTTP-date.
019 * 
020 * <p>
021 * <h5 class='figure'>Example</h5>
022 * <p class='bcode'>
023 *    If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT
024 * </p>
025 * 
026 * <h5 class='section'>See Also:</h5>
027 * <ul class='doctree'>
028 *    <li class='extlink'><a class='doclink' href='https://www.w3.org/Protocols/rfc2616/rfc2616.html'>Hypertext Transfer Protocol -- HTTP/1.1</a>
029 * </ul>
030 */
031public class HeaderDate {
032
033   private final java.util.Date date;
034   private final String raw;
035
036   /**
037    * Constructor.
038    * 
039    * @param raw The raw header value.
040    */
041   protected HeaderDate(String raw) {
042      this.raw = raw;
043      this.date = DateUtils.parseDate(raw);
044   }
045
046   /**
047    * Returns this header value as a {@link java.util.Date}.
048    * 
049    * @return This header value as a {@link java.util.Date}, or <jk>null</jk> if the header could not be parsed.
050    */
051   public java.util.Date asDate() {
052      return date;
053   }
054
055   @Override /* Object */
056   public String toString() {
057      return raw;
058   }
059}