| /* |
| * 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. |
| * |
| */ |
| package org.apache.mina.http; |
| |
| import java.text.DateFormat; |
| import java.text.ParseException; |
| import java.text.SimpleDateFormat; |
| import java.util.Calendar; |
| import java.util.Date; |
| import java.util.Locale; |
| import java.util.TimeZone; |
| import java.util.regex.Pattern; |
| |
| /** |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class DateUtil { |
| /** A thread local is used to protect the DateFormat against concurrent access */ |
| private static final ThreadLocal<DateFormat> RFC_1123_FORMAT = new ThreadLocal<DateFormat>() { |
| /** |
| * Initialize the formatter |
| */ |
| protected DateFormat initialValue() { |
| DateFormat dateFormat = new SimpleDateFormat(RFC_1123_PATTERN, Locale.US); |
| TimeZone gmtZone = TimeZone.getTimeZone("GMT"); |
| dateFormat.setTimeZone(gmtZone); |
| |
| return dateFormat; |
| } |
| }; |
| |
| /** The format of an HTTP date */ |
| private static final String RFC_1123_PATTERN = "EEE, dd MMM yyyy HH:mm:ss zzz"; |
| |
| /** Pattern to find digits only. */ |
| private static final Pattern DIGIT_PATTERN = Pattern.compile("^\\d+$"); |
| |
| /** |
| * Returns the current date as String |
| * |
| * @return Current Date as String, in the format <i>EEE, dd MMM yyyy HH:mm:ss zzz</i> |
| */ |
| public static String getCurrentAsString() { |
| return RFC_1123_FORMAT.get().format(new Date()); |
| } |
| |
| /** |
| * Translate a given date <code>String</code> in the <em>RFC 1123</em> |
| * format to a <code>long</code> representing the number of milliseconds |
| * since epoch. |
| * |
| * @param dateString a date <code>String</code> in the <em>RFC 1123</em> |
| * format. |
| * @return the parsed <code>Date</code> in milliseconds. |
| */ |
| private static long parseDateStringToMilliseconds(final String dateString) { |
| |
| try { |
| return RFC_1123_FORMAT.get().parse(dateString).getTime(); |
| } catch (final ParseException e) { |
| return 0; |
| } |
| } |
| |
| /** |
| * Parse a given date <code>String</code> to a <code>long</code> |
| * representation of the time. Where the provided value is all digits the |
| * value is returned as a <code>long</code>, otherwise attempt is made to |
| * parse the <code>String</code> as a <em>RFC 1123</em> date. |
| * |
| * @param dateValue the value to parse. |
| * @return the <code>long</code> value following parse, or zero where not |
| * successful. |
| */ |
| public static long parseToMilliseconds(final String dateValue) { |
| |
| long ms = 0; |
| |
| if (DIGIT_PATTERN.matcher(dateValue).matches()) { |
| ms = Long.parseLong(dateValue); |
| } else { |
| ms = parseDateStringToMilliseconds(dateValue); |
| } |
| |
| return ms; |
| } |
| |
| /** |
| * Converts a millisecond representation of a date to a |
| * <code>RFC 1123</code> formatted <code>String</code>. |
| * |
| * @param dateValue the <code>Date</code> represented as milliseconds. |
| * @return a <code>String</code> representation of the date. |
| */ |
| public static String parseToRFC1123(final long dateValue) { |
| final Calendar calendar = Calendar.getInstance(); |
| calendar.setTimeInMillis(dateValue); |
| |
| return RFC_1123_FORMAT.get().format(calendar.getTime()); |
| } |
| |
| /** |
| * Convert a given <code>Date</code> object to a <code>RFC 1123</code> |
| * formatted <code>String</code>. |
| * |
| * @param date the <code>Date</code> object to convert |
| * @return a <code>String</code> representation of the date. |
| */ |
| public static String getDateAsString(Date date) { |
| return RFC_1123_FORMAT.get().format(date); |
| } |
| } |