001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.mina.http; 021 022import java.text.DateFormat; 023import java.text.ParseException; 024import java.text.SimpleDateFormat; 025import java.util.Calendar; 026import java.util.Date; 027import java.util.Locale; 028import java.util.TimeZone; 029import java.util.regex.Pattern; 030 031public class DateUtil { 032 033 private final static Locale LOCALE = Locale.US; 034 private final static TimeZone GMT_ZONE; 035 private final static String RFC_1123_PATTERN = "EEE, dd MMM yyyy HH:mm:ss zzz"; 036 private final static DateFormat RFC_1123_FORMAT; 037 038 /** Pattern to find digits only. */ 039 private final static Pattern DIGIT_PATTERN = Pattern.compile("^\\d+$"); 040 041 static { 042 RFC_1123_FORMAT = new SimpleDateFormat(DateUtil.RFC_1123_PATTERN, DateUtil.LOCALE); 043 GMT_ZONE = TimeZone.getTimeZone("GMT"); 044 DateUtil.RFC_1123_FORMAT.setTimeZone(DateUtil.GMT_ZONE); 045 } 046 047 public static String getCurrentAsString() { 048 synchronized(DateUtil.RFC_1123_FORMAT) { 049 return DateUtil.RFC_1123_FORMAT.format(new Date()); //NOPMD 050 } 051 } 052 053 /** 054 * Translate a given date <code>String</code> in the <em>RFC 1123</em> 055 * format to a <code>long</code> representing the number of milliseconds 056 * since epoch. 057 * 058 * @param dateString a date <code>String</code> in the <em>RFC 1123</em> 059 * format. 060 * @return the parsed <code>Date</code> in milliseconds. 061 */ 062 private static long parseDateStringToMilliseconds(final String dateString) { 063 064 try { 065 synchronized (DateUtil.RFC_1123_FORMAT) { 066 return DateUtil.RFC_1123_FORMAT.parse(dateString).getTime(); //NOPMD 067 } 068 } catch (final ParseException e) { 069 return 0; 070 } 071 } 072 073 /** 074 * Parse a given date <code>String</code> to a <code>long</code> 075 * representation of the time. Where the provided value is all digits the 076 * value is returned as a <code>long</code>, otherwise attempt is made to 077 * parse the <code>String</code> as a <em>RFC 1123</em> date. 078 * 079 * @param dateValue the value to parse. 080 * @return the <code>long</code> value following parse, or zero where not 081 * successful. 082 */ 083 public static long parseToMilliseconds(final String dateValue) { 084 085 long ms = 0; 086 087 if (DateUtil.DIGIT_PATTERN.matcher(dateValue).matches()) { 088 ms = Long.parseLong(dateValue); 089 } else { 090 ms = parseDateStringToMilliseconds(dateValue); 091 } 092 093 return ms; 094 } 095 096 /** 097 * Converts a millisecond representation of a date to a 098 * <code>RFC 1123</code> formatted <code>String</code>. 099 * 100 * @param dateValue the <code>Date</code> represented as milliseconds. 101 * @return a <code>String</code> representation of the date. 102 */ 103 public static String parseToRFC1123(final long dateValue) { 104 105 final Calendar calendar = Calendar.getInstance(); 106 calendar.setTimeInMillis(dateValue); 107 108 synchronized (DateUtil.RFC_1123_FORMAT) { 109 return DateUtil.RFC_1123_FORMAT.format(calendar.getTime()); //NOPMD 110 } 111 } 112 113 /** 114 * Convert a given <code>Date</code> object to a <code>RFC 1123</code> 115 * formatted <code>String</code>. 116 * 117 * @param date the <code>Date</code> object to convert 118 * @return a <code>String</code> representation of the date. 119 */ 120 public static String getDateAsString(Date date) { 121 synchronized (DateUtil.RFC_1123_FORMAT) { 122 return RFC_1123_FORMAT.format(date); //NOPMD 123 } 124 } 125 126}