| /* |
| * 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; |
| |
| /** |
| * An utility class for Dates manipulations |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class DateUtil { |
| private static final Locale LOCALE = Locale.US; |
| private static final TimeZone GMT_ZONE; |
| private static final String RFC_1123_PATTERN = "EEE, dd MMM yyyy HH:mm:ss zzz"; |
| private static final DateFormat RFC_1123_FORMAT; |
| |
| /** Pattern to find digits only. */ |
| private static final Pattern DIGIT_PATTERN = Pattern.compile("^\\d+$"); |
| |
| static { |
| RFC_1123_FORMAT = new SimpleDateFormat(DateUtil.RFC_1123_PATTERN, DateUtil.LOCALE); |
| GMT_ZONE = TimeZone.getTimeZone("GMT"); |
| DateUtil.RFC_1123_FORMAT.setTimeZone(DateUtil.GMT_ZONE); |
| } |
| |
| private DateUtil() { |
| } |
| |
| /** |
| * @return The current date as a string |
| */ |
| public static String getCurrentAsString() { |
| synchronized(DateUtil.RFC_1123_FORMAT) { |
| return DateUtil.RFC_1123_FORMAT.format(new Date()); //NOPMD |
| } |
| } |
| |
| /** |
| * 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(String dateString) { |
| try { |
| synchronized (DateUtil.RFC_1123_FORMAT) { |
| return DateUtil.RFC_1123_FORMAT.parse(dateString).getTime(); //NOPMD |
| } |
| } catch (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(String dateValue) { |
| if (DateUtil.DIGIT_PATTERN.matcher(dateValue).matches()) { |
| return Long.parseLong(dateValue); |
| } else { |
| return parseDateStringToMilliseconds(dateValue); |
| } |
| } |
| |
| /** |
| * 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(long dateValue) { |
| |
| Calendar calendar = Calendar.getInstance(); |
| calendar.setTimeInMillis(dateValue); |
| |
| synchronized (DateUtil.RFC_1123_FORMAT) { |
| return DateUtil.RFC_1123_FORMAT.format(calendar.getTime()); //NOPMD |
| } |
| } |
| |
| /** |
| * 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) { |
| synchronized (DateUtil.RFC_1123_FORMAT) { |
| return RFC_1123_FORMAT.format(date); //NOPMD |
| } |
| } |
| } |