1069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project/* 2069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/HttpDateGenerator.java $ 3069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $Revision: 548066 $ 4069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * $Date: 2007-06-17 09:51:55 -0700 (Sun, 17 Jun 2007) $ 5069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 6069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * ==================================================================== 7069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one 8069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * or more contributor license agreements. See the NOTICE file 9069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * distributed with this work for additional information 10069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * regarding copyright ownership. The ASF licenses this file 11069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * to you under the Apache License, Version 2.0 (the 12069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * "License"); you may not use this file except in compliance 13069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * with the License. You may obtain a copy of the License at 14069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 15069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 16069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 17069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * Unless required by applicable law or agreed to in writing, 18069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * software distributed under the License is distributed on an 19069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * KIND, either express or implied. See the License for the 21069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * specific language governing permissions and limitations 22069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * under the License. 23069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * ==================================================================== 24069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 25069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * This software consists of voluntary contributions made by many 26069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * individuals on behalf of the Apache Software Foundation. For more 27069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * information on the Apache Software Foundation, please see 28069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * <http://www.apache.org/>. 29069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 30069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project */ 31069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 32069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectpackage org.apache.http.protocol; 33069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 34069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.text.DateFormat; 35069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.text.SimpleDateFormat; 36069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.util.Date; 37069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.util.Locale; 38069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectimport java.util.TimeZone; 39069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 40069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 41069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project/** 42069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * Generates a date in the format required by the HTTP protocol. 43069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 44069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> 45069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 46069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @version $Revision: 548066 $ 47069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * 48069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project * @since 4.0 49069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project */ 50069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Projectpublic class HttpDateGenerator { 51069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 52069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project /** Date format pattern used to generate the header in RFC 1123 format. */ 53069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project public static final 54069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz"; 55069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 56069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project /** The time zone to use in the date header. */ 57069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project public static final TimeZone GMT = TimeZone.getTimeZone("GMT"); 58069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 59069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 60069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project private final DateFormat dateformat; 61069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 62069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project private long dateAsLong = 0L; 63069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project private String dateAsText = null; 64069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 65069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project public HttpDateGenerator() { 66069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project super(); 67069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project this.dateformat = new SimpleDateFormat(PATTERN_RFC1123, Locale.US); 68069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project this.dateformat.setTimeZone(GMT); 69069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 70069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 71069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project public synchronized String getCurrentDate() { 72069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project long now = System.currentTimeMillis(); 73069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project if (now - this.dateAsLong > 1000) { 74069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project // Generate new date string 75069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project this.dateAsText = this.dateformat.format(new Date(now)); 76069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project this.dateAsLong = now; 77069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 78069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project return this.dateAsText; 79069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project } 80069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project 81069490a5ca2fd1988d29daf45d892f47ad665115The Android Open Source Project} 82