| /* |
| * 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.tomcat.lite.util; |
| |
| import java.text.DateFormat; |
| import java.text.ParseException; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| import java.util.Locale; |
| import java.util.TimeZone; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Utility class to generate HTTP dates. |
| * |
| * @author Remy Maucherat |
| */ |
| public final class FastHttpDateFormat { |
| |
| |
| // -------------------------------------------------------------- Variables |
| |
| |
| protected static final int CACHE_SIZE = |
| Integer.parseInt(System.getProperty("org.apache.tomcat.util.http.FastHttpDateFormat.CACHE_SIZE", "1000")); |
| |
| |
| /** |
| * HTTP date format. |
| */ |
| protected static final SimpleDateFormat format = |
| new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US); |
| |
| |
| /** |
| * The set of SimpleDateFormat formats to use in getDateHeader(). |
| */ |
| protected static final SimpleDateFormat formats[] = { |
| new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US), |
| new SimpleDateFormat("EEEEEE, dd-MMM-yy HH:mm:ss zzz", Locale.US), |
| new SimpleDateFormat("EEE MMMM d HH:mm:ss yyyy", Locale.US) |
| }; |
| |
| |
| protected final static TimeZone gmtZone = TimeZone.getTimeZone("GMT"); |
| |
| |
| /** |
| * GMT timezone - all HTTP dates are on GMT |
| */ |
| static { |
| |
| format.setTimeZone(gmtZone); |
| |
| formats[0].setTimeZone(gmtZone); |
| formats[1].setTimeZone(gmtZone); |
| formats[2].setTimeZone(gmtZone); |
| |
| } |
| |
| |
| /** |
| * Instant on which the currentDate object was generated. |
| */ |
| protected static long currentDateGenerated = 0L; |
| |
| |
| /** |
| * Current formatted date. |
| */ |
| protected static String currentDate = null; |
| |
| |
| /** |
| * Formatter cache. |
| */ |
| protected static final ConcurrentHashMap<Long, String> formatCache = |
| new ConcurrentHashMap<Long, String>(CACHE_SIZE); |
| |
| |
| /** |
| * Parser cache. |
| */ |
| protected static final ConcurrentHashMap<String, Long> parseCache = |
| new ConcurrentHashMap<String, Long>(CACHE_SIZE); |
| |
| |
| // --------------------------------------------------------- Public Methods |
| |
| |
| /** |
| * Get the current date in HTTP format. |
| */ |
| public static final String getCurrentDate() { |
| |
| long now = System.currentTimeMillis(); |
| if ((now - currentDateGenerated) > 1000) { |
| synchronized (format) { |
| if ((now - currentDateGenerated) > 1000) { |
| currentDateGenerated = now; |
| currentDate = format.format(new Date(now)); |
| } |
| } |
| } |
| return currentDate; |
| |
| } |
| |
| |
| /** |
| * Get the HTTP format of the specified date. |
| */ |
| public static final String formatDate |
| (long value, DateFormat threadLocalformat) { |
| |
| Long longValue = new Long(value); |
| String cachedDate = formatCache.get(longValue); |
| if (cachedDate != null) |
| return cachedDate; |
| |
| String newDate = null; |
| Date dateValue = new Date(value); |
| if (threadLocalformat != null) { |
| newDate = threadLocalformat.format(dateValue); |
| updateFormatCache(longValue, newDate); |
| } else { |
| synchronized (formatCache) { |
| synchronized (format) { |
| newDate = format.format(dateValue); |
| } |
| updateFormatCache(longValue, newDate); |
| } |
| } |
| return newDate; |
| |
| } |
| |
| |
| /** |
| * Try to parse the given date as a HTTP date. |
| */ |
| public static final long parseDate(String value, |
| DateFormat[] threadLocalformats) { |
| |
| Long cachedDate = parseCache.get(value); |
| if (cachedDate != null) |
| return cachedDate.longValue(); |
| |
| Long date = null; |
| if (threadLocalformats != null) { |
| date = internalParseDate(value, threadLocalformats); |
| updateParseCache(value, date); |
| } else { |
| synchronized (parseCache) { |
| date = internalParseDate(value, formats); |
| updateParseCache(value, date); |
| } |
| } |
| if (date == null) { |
| return (-1L); |
| } else { |
| return date.longValue(); |
| } |
| |
| } |
| |
| |
| /** |
| * Parse date with given formatters. |
| */ |
| private static final Long internalParseDate |
| (String value, DateFormat[] formats) { |
| Date date = null; |
| for (int i = 0; (date == null) && (i < formats.length); i++) { |
| try { |
| date = formats[i].parse(value); |
| } catch (ParseException e) { |
| ; |
| } |
| } |
| if (date == null) { |
| return null; |
| } |
| return new Long(date.getTime()); |
| } |
| |
| |
| /** |
| * Update cache. |
| */ |
| private static void updateFormatCache(Long key, String value) { |
| if (value == null) { |
| return; |
| } |
| if (formatCache.size() > CACHE_SIZE) { |
| formatCache.clear(); |
| } |
| formatCache.put(key, value); |
| } |
| |
| |
| /** |
| * Update cache. |
| */ |
| private static void updateParseCache(String key, Long value) { |
| if (value == null) { |
| return; |
| } |
| if (parseCache.size() > CACHE_SIZE) { |
| parseCache.clear(); |
| } |
| parseCache.put(key, value); |
| } |
| |
| |
| } |