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260 lines
8.9 KiB
Java
260 lines
8.9 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.impl.cookie;
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import java.lang.ref.SoftReference;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Locale;
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import java.util.Map;
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import java.util.TimeZone;
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import ch.boye.httpclientandroidlib.annotation.Immutable;
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/**
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* A utility class for parsing and formatting HTTP dates as used in cookies and
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* other headers. This class handles dates as defined by RFC 2616 section
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* 3.3.1 as well as some other common non-standard formats.
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*
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*
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* @since 4.0
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*/
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@Immutable
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public final class DateUtils {
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/**
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* Date format pattern used to parse HTTP date headers in RFC 1123 format.
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*/
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public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
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/**
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* Date format pattern used to parse HTTP date headers in RFC 1036 format.
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*/
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public static final String PATTERN_RFC1036 = "EEEE, dd-MMM-yy HH:mm:ss zzz";
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/**
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* Date format pattern used to parse HTTP date headers in ANSI C
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* <code>asctime()</code> format.
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*/
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public static final String PATTERN_ASCTIME = "EEE MMM d HH:mm:ss yyyy";
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private static final String[] DEFAULT_PATTERNS = new String[] {
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PATTERN_RFC1036,
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PATTERN_RFC1123,
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PATTERN_ASCTIME
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};
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private static final Date DEFAULT_TWO_DIGIT_YEAR_START;
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public static final TimeZone GMT = TimeZone.getTimeZone("GMT");
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static {
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Calendar calendar = Calendar.getInstance();
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calendar.setTimeZone(GMT);
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calendar.set(2000, Calendar.JANUARY, 1, 0, 0, 0);
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calendar.set(Calendar.MILLISECOND, 0);
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DEFAULT_TWO_DIGIT_YEAR_START = calendar.getTime();
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}
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/**
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* Parses a date value. The formats used for parsing the date value are retrieved from
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* the default http params.
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*
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* @param dateValue the date value to parse
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*
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* @return the parsed date
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*
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* @throws DateParseException if the value could not be parsed using any of the
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* supported date formats
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*/
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public static Date parseDate(String dateValue) throws DateParseException {
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return parseDate(dateValue, null, null);
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}
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/**
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* Parses the date value using the given date formats.
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*
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* @param dateValue the date value to parse
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* @param dateFormats the date formats to use
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*
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* @return the parsed date
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*
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* @throws DateParseException if none of the dataFormats could parse the dateValue
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*/
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public static Date parseDate(final String dateValue, String[] dateFormats)
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throws DateParseException {
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return parseDate(dateValue, dateFormats, null);
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}
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/**
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* Parses the date value using the given date formats.
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*
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* @param dateValue the date value to parse
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* @param dateFormats the date formats to use
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* @param startDate During parsing, two digit years will be placed in the range
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* <code>startDate</code> to <code>startDate + 100 years</code>. This value may
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* be <code>null</code>. When <code>null</code> is given as a parameter, year
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* <code>2000</code> will be used.
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*
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* @return the parsed date
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*
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* @throws DateParseException if none of the dataFormats could parse the dateValue
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*/
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public static Date parseDate(
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String dateValue,
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String[] dateFormats,
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Date startDate
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) throws DateParseException {
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if (dateValue == null) {
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throw new IllegalArgumentException("dateValue is null");
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}
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if (dateFormats == null) {
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dateFormats = DEFAULT_PATTERNS;
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}
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if (startDate == null) {
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startDate = DEFAULT_TWO_DIGIT_YEAR_START;
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}
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// trim single quotes around date if present
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// see issue #5279
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if (dateValue.length() > 1
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&& dateValue.startsWith("'")
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&& dateValue.endsWith("'")
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) {
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dateValue = dateValue.substring (1, dateValue.length() - 1);
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}
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for (String dateFormat : dateFormats) {
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SimpleDateFormat dateParser = DateFormatHolder.formatFor(dateFormat);
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dateParser.set2DigitYearStart(startDate);
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try {
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return dateParser.parse(dateValue);
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} catch (ParseException pe) {
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// ignore this exception, we will try the next format
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}
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}
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// we were unable to parse the date
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throw new DateParseException("Unable to parse the date " + dateValue);
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}
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/**
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* Formats the given date according to the RFC 1123 pattern.
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*
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* @param date The date to format.
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* @return An RFC 1123 formatted date string.
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*
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* @see #PATTERN_RFC1123
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*/
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public static String formatDate(Date date) {
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return formatDate(date, PATTERN_RFC1123);
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}
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/**
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* Formats the given date according to the specified pattern. The pattern
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* must conform to that used by the {@link SimpleDateFormat simple date
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* format} class.
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*
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* @param date The date to format.
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* @param pattern The pattern to use for formatting the date.
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* @return A formatted date string.
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*
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* @throws IllegalArgumentException If the given date pattern is invalid.
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*
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* @see SimpleDateFormat
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*/
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public static String formatDate(Date date, String pattern) {
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if (date == null) throw new IllegalArgumentException("date is null");
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if (pattern == null) throw new IllegalArgumentException("pattern is null");
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SimpleDateFormat formatter = DateFormatHolder.formatFor(pattern);
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return formatter.format(date);
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}
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/** This class should not be instantiated. */
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private DateUtils() {
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}
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/**
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* A factory for {@link SimpleDateFormat}s. The instances are stored in a
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* threadlocal way because SimpleDateFormat is not threadsafe as noted in
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* {@link SimpleDateFormat its javadoc}.
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*
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*/
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final static class DateFormatHolder {
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private static final ThreadLocal<SoftReference<Map<String, SimpleDateFormat>>>
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THREADLOCAL_FORMATS = new ThreadLocal<SoftReference<Map<String, SimpleDateFormat>>>() {
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@Override
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protected SoftReference<Map<String, SimpleDateFormat>> initialValue() {
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return new SoftReference<Map<String, SimpleDateFormat>>(
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new HashMap<String, SimpleDateFormat>());
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}
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};
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/**
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* creates a {@link SimpleDateFormat} for the requested format string.
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*
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* @param pattern
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* a non-<code>null</code> format String according to
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* {@link SimpleDateFormat}. The format is not checked against
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* <code>null</code> since all paths go through
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* {@link DateUtils}.
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* @return the requested format. This simple dateformat should not be used
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* to {@link SimpleDateFormat#applyPattern(String) apply} to a
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* different pattern.
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*/
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public static SimpleDateFormat formatFor(String pattern) {
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SoftReference<Map<String, SimpleDateFormat>> ref = THREADLOCAL_FORMATS.get();
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Map<String, SimpleDateFormat> formats = ref.get();
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if (formats == null) {
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formats = new HashMap<String, SimpleDateFormat>();
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THREADLOCAL_FORMATS.set(
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new SoftReference<Map<String, SimpleDateFormat>>(formats));
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}
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SimpleDateFormat format = formats.get(pattern);
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if (format == null) {
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format = new SimpleDateFormat(pattern, Locale.US);
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format.setTimeZone(TimeZone.getTimeZone("GMT"));
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formats.put(pattern, format);
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}
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return format;
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}
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}
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}
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