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Diffstat (limited to 'mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/DateUtils.java')
-rw-r--r-- | mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/DateUtils.java | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/DateUtils.java b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/DateUtils.java new file mode 100644 index 000000000..e337923d3 --- /dev/null +++ b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/DateUtils.java @@ -0,0 +1,250 @@ +/* + * ==================================================================== + * 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. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + * + */ + +package ch.boye.httpclientandroidlib.client.utils; + +import java.lang.ref.SoftReference; +import java.text.ParsePosition; +import java.text.SimpleDateFormat; +import java.util.Calendar; +import java.util.Date; +import java.util.HashMap; +import java.util.Locale; +import java.util.Map; +import java.util.TimeZone; + +import ch.boye.httpclientandroidlib.annotation.Immutable; +import ch.boye.httpclientandroidlib.util.Args; + +/** + * A utility class for parsing and formatting HTTP dates as used in cookies and + * other headers. This class handles dates as defined by RFC 2616 section + * 3.3.1 as well as some other common non-standard formats. + * + * @since 4.3 + */ +@Immutable +public final class DateUtils { + + /** + * Date format pattern used to parse HTTP date headers in RFC 1123 format. + */ + public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz"; + + /** + * Date format pattern used to parse HTTP date headers in RFC 1036 format. + */ + public static final String PATTERN_RFC1036 = "EEE, dd-MMM-yy HH:mm:ss zzz"; + + /** + * Date format pattern used to parse HTTP date headers in ANSI C + * <code>asctime()</code> format. + */ + public static final String PATTERN_ASCTIME = "EEE MMM d HH:mm:ss yyyy"; + + private static final String[] DEFAULT_PATTERNS = new String[] { + PATTERN_RFC1123, + PATTERN_RFC1036, + PATTERN_ASCTIME + }; + + private static final Date DEFAULT_TWO_DIGIT_YEAR_START; + + public static final TimeZone GMT = TimeZone.getTimeZone("GMT"); + + static { + final Calendar calendar = Calendar.getInstance(); + calendar.setTimeZone(GMT); + calendar.set(2000, Calendar.JANUARY, 1, 0, 0, 0); + calendar.set(Calendar.MILLISECOND, 0); + DEFAULT_TWO_DIGIT_YEAR_START = calendar.getTime(); + } + + /** + * Parses a date value. The formats used for parsing the date value are retrieved from + * the default http params. + * + * @param dateValue the date value to parse + * + * @return the parsed date or null if input could not be parsed + */ + public static Date parseDate(final String dateValue) { + return parseDate(dateValue, null, null); + } + + /** + * Parses the date value using the given date formats. + * + * @param dateValue the date value to parse + * @param dateFormats the date formats to use + * + * @return the parsed date or null if input could not be parsed + */ + public static Date parseDate(final String dateValue, final String[] dateFormats) { + return parseDate(dateValue, dateFormats, null); + } + + /** + * Parses the date value using the given date formats. + * + * @param dateValue the date value to parse + * @param dateFormats the date formats to use + * @param startDate During parsing, two digit years will be placed in the range + * <code>startDate</code> to <code>startDate + 100 years</code>. This value may + * be <code>null</code>. When <code>null</code> is given as a parameter, year + * <code>2000</code> will be used. + * + * @return the parsed date or null if input could not be parsed + */ + public static Date parseDate( + final String dateValue, + final String[] dateFormats, + final Date startDate) { + Args.notNull(dateValue, "Date value"); + final String[] localDateFormats = dateFormats != null ? dateFormats : DEFAULT_PATTERNS; + final Date localStartDate = startDate != null ? startDate : DEFAULT_TWO_DIGIT_YEAR_START; + String v = dateValue; + // trim single quotes around date if present + // see issue #5279 + if (v.length() > 1 && v.startsWith("'") && v.endsWith("'")) { + v = v.substring (1, v.length() - 1); + } + + for (final String dateFormat : localDateFormats) { + final SimpleDateFormat dateParser = DateFormatHolder.formatFor(dateFormat); + dateParser.set2DigitYearStart(localStartDate); + final ParsePosition pos = new ParsePosition(0); + final Date result = dateParser.parse(v, pos); + if (pos.getIndex() != 0) { + return result; + } + } + return null; + } + + /** + * Formats the given date according to the RFC 1123 pattern. + * + * @param date The date to format. + * @return An RFC 1123 formatted date string. + * + * @see #PATTERN_RFC1123 + */ + public static String formatDate(final Date date) { + return formatDate(date, PATTERN_RFC1123); + } + + /** + * Formats the given date according to the specified pattern. The pattern + * must conform to that used by the {@link SimpleDateFormat simple date + * format} class. + * + * @param date The date to format. + * @param pattern The pattern to use for formatting the date. + * @return A formatted date string. + * + * @throws IllegalArgumentException If the given date pattern is invalid. + * + * @see SimpleDateFormat + */ + public static String formatDate(final Date date, final String pattern) { + Args.notNull(date, "Date"); + Args.notNull(pattern, "Pattern"); + final SimpleDateFormat formatter = DateFormatHolder.formatFor(pattern); + return formatter.format(date); + } + + /** + * Clears thread-local variable containing {@link java.text.DateFormat} cache. + * + * @since 4.3 + */ + public static void clearThreadLocal() { + DateFormatHolder.clearThreadLocal(); + } + + /** This class should not be instantiated. */ + private DateUtils() { + } + + /** + * A factory for {@link SimpleDateFormat}s. The instances are stored in a + * threadlocal way because SimpleDateFormat is not threadsafe as noted in + * {@link SimpleDateFormat its javadoc}. + * + */ + final static class DateFormatHolder { + + private static final ThreadLocal<SoftReference<Map<String, SimpleDateFormat>>> + THREADLOCAL_FORMATS = new ThreadLocal<SoftReference<Map<String, SimpleDateFormat>>>() { + + @Override + protected SoftReference<Map<String, SimpleDateFormat>> initialValue() { + return new SoftReference<Map<String, SimpleDateFormat>>( + new HashMap<String, SimpleDateFormat>()); + } + + }; + + /** + * creates a {@link SimpleDateFormat} for the requested format string. + * + * @param pattern + * a non-<code>null</code> format String according to + * {@link SimpleDateFormat}. The format is not checked against + * <code>null</code> since all paths go through + * {@link DateUtils}. + * @return the requested format. This simple dateformat should not be used + * to {@link SimpleDateFormat#applyPattern(String) apply} to a + * different pattern. + */ + public static SimpleDateFormat formatFor(final String pattern) { + final SoftReference<Map<String, SimpleDateFormat>> ref = THREADLOCAL_FORMATS.get(); + Map<String, SimpleDateFormat> formats = ref.get(); + if (formats == null) { + formats = new HashMap<String, SimpleDateFormat>(); + THREADLOCAL_FORMATS.set( + new SoftReference<Map<String, SimpleDateFormat>>(formats)); + } + + SimpleDateFormat format = formats.get(pattern); + if (format == null) { + format = new SimpleDateFormat(pattern, Locale.US); + format.setTimeZone(TimeZone.getTimeZone("GMT")); + formats.put(pattern, format); + } + + return format; + } + + public static void clearThreadLocal() { + THREADLOCAL_FORMATS.remove(); + } + + } + +} |