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git-svn-id: http://jclouds.googlecode.com/svn/trunk@842 3d8758e0-26b5-11de-8745-db77d3ebf521
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adrian.f.cole
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/**
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*
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* Copyright (C) 2009 Adrian Cole <adrian@jclouds.org>
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*
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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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package org.jclouds.aws.s3.util;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Locale;
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import java.util.SimpleTimeZone;
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import net.jcip.annotations.GuardedBy;
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import net.jcip.annotations.ThreadSafe;
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import org.joda.time.DateTime;
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import org.joda.time.DateTimeZone;
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import org.joda.time.format.DateTimeFormat;
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import org.joda.time.format.DateTimeFormatter;
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import com.google.common.annotations.VisibleForTesting;
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/**
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* Parses and formats the ISO8601 and RFC822 date formats found in
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* XML responses and HTTP response headers.
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* <p>
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* Either {@link SimpleDateFormat} or {@link DateTimeFormatter}
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* classes are used internally, depending on which version gives
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* the best performance.
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*
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* @author Adrian Cole
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* @author James Murty
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*/
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@ThreadSafe
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public class DateService {
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/*
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* Use default Java Date/SimpleDateFormat classes for date
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* manipulation, but be *very* careful to guard against
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* the lack of thread safety.
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*/
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@GuardedBy("this")
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private static final SimpleDateFormat iso8601SimpleDateFormat =
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new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
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@GuardedBy("this")
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private static final SimpleDateFormat rfc822SimpleDateFormat =
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new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
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private static final DateTimeFormatter iso8601DateTimeFormatter =
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DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
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.withLocale(Locale.US).withZone(DateTimeZone.forID("GMT"));
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private static final DateTimeFormatter rfc822DateTimeFormatter =
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DateTimeFormat.forPattern("EEE, dd MMM yyyy HH:mm:ss 'GMT'")
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.withLocale(Locale.US).withZone(DateTimeZone.forID("GMT"));
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static {
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iso8601SimpleDateFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
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rfc822SimpleDateFormat.setTimeZone(new SimpleTimeZone(0, "GMT"));
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}
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public final String rfc822DateFormat(DateTime dateTime) {
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return rfc822DateTimeFormatter.print(dateTime);
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}
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public final String rfc822DateFormat(Date date) {
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return rfc822DateFormat(new DateTime(date));
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}
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public final String rfc822DateFormat() {
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return rfc822DateFormat(new DateTime());
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}
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public final DateTime rfc822DateParse(String toParse) {
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synchronized (rfc822SimpleDateFormat) {
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try {
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return new DateTime(rfc822SimpleDateFormat.parse(toParse));
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} catch (ParseException e) {
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return null;
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}
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}
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}
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public final String iso8601DateFormat(DateTime dateTime) {
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return iso8601DateTimeFormatter.print(dateTime);
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}
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public final String iso8601DateFormat(Date date) {
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return iso8601DateFormat(new DateTime(date));
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}
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public final String iso8601DateFormat() {
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return iso8601DateFormat(new DateTime());
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}
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public final DateTime iso8601DateParse(String toParse) {
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synchronized (iso8601SimpleDateFormat) {
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try {
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return new DateTime(iso8601SimpleDateFormat.parse(toParse));
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} catch (ParseException e) {
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return null;
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}
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}
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}
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/*
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* Alternative implementations of Format and Parse -- used to
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* test relative speeds.
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* TODO: Remove methods below once sufficient performance testing is complete.
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*/
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@VisibleForTesting
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public final DateTime jodaIso8601DateParse(String toParse) {
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return new DateTime(toParse);
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}
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@VisibleForTesting
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public final String sdfIso8601DateFormat(DateTime dateTime) {
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synchronized (iso8601SimpleDateFormat) {
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return iso8601SimpleDateFormat.format(dateTime.toDate());
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}
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}
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}
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