| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/HttpDateGenerator.java $ |
| * $Revision: 548066 $ |
| * $Date: 2007-06-17 09:51:55 -0700 (Sun, 17 Jun 2007) $ |
| * |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.http.protocol; |
| |
| import java.text.DateFormat; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| import java.util.Locale; |
| import java.util.TimeZone; |
| |
| |
| /** |
| * Generates a date in the format required by the HTTP protocol. |
| * |
| * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> |
| * |
| * @version $Revision: 548066 $ |
| * |
| * @since 4.0 |
| */ |
| public class HttpDateGenerator { |
| |
| /** Date format pattern used to generate the header in RFC 1123 format. */ |
| public static final |
| String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz"; |
| |
| /** The time zone to use in the date header. */ |
| public static final TimeZone GMT = TimeZone.getTimeZone("GMT"); |
| |
| |
| private final DateFormat dateformat; |
| |
| private long dateAsLong = 0L; |
| private String dateAsText = null; |
| |
| public HttpDateGenerator() { |
| super(); |
| this.dateformat = new SimpleDateFormat(PATTERN_RFC1123, Locale.US); |
| this.dateformat.setTimeZone(GMT); |
| } |
| |
| public synchronized String getCurrentDate() { |
| long now = System.currentTimeMillis(); |
| if (now - this.dateAsLong > 1000) { |
| // Generate new date string |
| this.dateAsText = this.dateformat.format(new Date(now)); |
| this.dateAsLong = now; |
| } |
| return this.dateAsText; |
| } |
| |
| } |