1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.mina.http; 21 22 import java.text.DateFormat; 23 import java.text.ParseException; 24 import java.text.SimpleDateFormat; 25 import java.util.Calendar; 26 import java.util.Date; 27 import java.util.Locale; 28 import java.util.TimeZone; 29 import java.util.regex.Pattern; 30 31 public class DateUtil { 32 33 private final static Locale LOCALE = Locale.US; 34 private final static TimeZone GMT_ZONE; 35 private final static String RFC_1123_PATTERN = "EEE, dd MMM yyyy HH:mm:ss zzz"; 36 private final static DateFormat RFC_1123_FORMAT; 37 38 /** Pattern to find digits only. */ 39 private final static Pattern DIGIT_PATTERN = Pattern.compile("^\\d+$"); 40 41 static { 42 RFC_1123_FORMAT = new SimpleDateFormat(DateUtil.RFC_1123_PATTERN, DateUtil.LOCALE); 43 GMT_ZONE = TimeZone.getTimeZone("GMT"); 44 DateUtil.RFC_1123_FORMAT.setTimeZone(DateUtil.GMT_ZONE); 45 } 46 47 public static String getCurrentAsString() { 48 return DateUtil.RFC_1123_FORMAT.format(new Date()); //NOPMD 49 } 50 51 /** 52 * Translate a given date <code>String</code> in the <em>RFC 1123</em> 53 * format to a <code>long</code> representing the number of milliseconds 54 * since epoch. 55 * 56 * @param dateString a date <code>String</code> in the <em>RFC 1123</em> 57 * format. 58 * @return the parsed <code>Date</code> in milliseconds. 59 */ 60 private static long parseDateStringToMilliseconds(final String dateString) { 61 62 try { 63 return DateUtil.RFC_1123_FORMAT.parse(dateString).getTime(); //NOPMD 64 } catch (final ParseException e) { 65 return 0; 66 } 67 } 68 69 /** 70 * Parse a given date <code>String</code> to a <code>long</code> 71 * representation of the time. Where the provided value is all digits the 72 * value is returned as a <code>long</code>, otherwise attempt is made to 73 * parse the <code>String</code> as a <em>RFC 1123</em> date. 74 * 75 * @param dateValue the value to parse. 76 * @return the <code>long</code> value following parse, or zero where not 77 * successful. 78 */ 79 public static long parseToMilliseconds(final String dateValue) { 80 81 long ms = 0; 82 83 if (DateUtil.DIGIT_PATTERN.matcher(dateValue).matches()) { 84 ms = Long.parseLong(dateValue); 85 } else { 86 ms = parseDateStringToMilliseconds(dateValue); 87 } 88 89 return ms; 90 } 91 92 /** 93 * Converts a millisecond representation of a date to a 94 * <code>RFC 1123</code> formatted <code>String</code>. 95 * 96 * @param dateValue the <code>Date</code> represented as milliseconds. 97 * @return a <code>String</code> representation of the date. 98 */ 99 public static String parseToRFC1123(final long dateValue) { 100 101 final Calendar calendar = Calendar.getInstance(); 102 calendar.setTimeInMillis(dateValue); 103 104 return DateUtil.RFC_1123_FORMAT.format(calendar.getTime()); //NOPMD 105 } 106 107 /** 108 * Convert a given <code>Date</code> object to a <code>RFC 1123</code> 109 * formatted <code>String</code>. 110 * 111 * @param date the <code>Date</code> object to convert 112 * @return a <code>String</code> representation of the date. 113 */ 114 public static String getDateAsString(Date date) { 115 return RFC_1123_FORMAT.format(date); //NOPMD 116 } 117 118 }