/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* Licensed 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 br.com.caelum.vraptor.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import br.com.caelum.vraptor.ioc.Component;
/**
* Helper class for handling ISO8601 strings of the following format:
* "1982-06-10T05:00:00.000-03:00". It also supports parsing the "Z" timezone.
*
* @author Rafael Dipold
*/
@Component
public final class ISO8601Util {
/** Default Extended Format */
private static final String DEFAULT_ISO8601_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
private static final String REGEX_ISO8601 = "^(\\d{4})-?(\\d\\d)-?(\\d\\d)(?:T(\\d\\d)(?::?(\\d\\d)(?::?(\\d\\d)(?:\\.(\\d+))?)?)?(Z|([+-])(\\d\\d):?(\\d\\d)?)?)?$";
// 1 2 3 4 5 6 7 8 9 10 11
private final SimpleDateFormat formatter = new SimpleDateFormat(DEFAULT_ISO8601_FORMAT);
/** Transform Calendar to ISO8601 string. */
public String fromCalendar(final Calendar calendar) {
formatter.setTimeZone(calendar.getTimeZone());
return fromDate(calendar.getTime());
}
/** Transform java.util.Date to ISO8601 string. */
public String fromDate(final Date date) {
String formatted = formatter.format(date);
formatted = formatted.replaceAll("[+-]00:?00$", "Z");
return formatted;
}
/** Get current date and time formatted as ISO8601 string. */
public String now() {
return fromCalendar(GregorianCalendar.getInstance());
}
/** Transform ISO8601 string to Calendar
* @throws ParseException */
public Calendar toCalendar(final String iso8601String) throws ParseException {
Pattern pattern = Pattern.compile(REGEX_ISO8601);
Matcher matcher = pattern.matcher(iso8601String);
if (matcher.matches()) {
int year = matcher.group(1) != null ? Integer.valueOf(matcher.group(1)) : 0;
int month = matcher.group(2) != null ? Integer.valueOf(matcher.group(2)) - 1 : 0;
int day = matcher.group(3) != null ? Integer.valueOf(matcher.group(3)) : 0;
int h = matcher.group(4) != null ? Integer.valueOf(matcher.group(4)) : 0;
int m = matcher.group(5) != null ? Integer.valueOf(matcher.group(5)) : 0;
int s = matcher.group(6) != null ? Integer.valueOf(matcher.group(6)) : 0;
int ms = Math.round(Float.parseFloat("0." + (matcher.group(7) != null ? matcher.group(7) : "0")) * 1000);
TimeZone timeZone = TimeZone.getTimeZone("GMT" + (matcher.group(8) != null ? matcher.group(8) : ""));
Calendar calendar = GregorianCalendar.getInstance(timeZone);
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.DAY_OF_MONTH, day);
calendar.set(Calendar.HOUR_OF_DAY, h);
calendar.set(Calendar.MINUTE, m);
calendar.set(Calendar.SECOND, s);
calendar.set(Calendar.MILLISECOND, ms);
return calendar;
}
else
throw new java.text.ParseException("Unparseable ISO8601 date format: " + iso8601String, 0);
}
/** Transform ISO8601 string to java.util.Date */
public Date toDate(final String iso8601String) throws ParseException {
Calendar calendar = toCalendar(iso8601String);
return calendar.getTime();
}
}