strolch/li.strolch.utils/src/main/java/li/strolch/utils/iso8601/ISO8601.java

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/*
* Copyright 2013 Martin Smock <smock.martin@gmail.com>
*
* 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 li.strolch.utils.iso8601;
import static java.time.ZoneId.systemDefault;
import static java.time.temporal.ChronoField.*;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.SignStyle;
import java.util.Date;
import li.strolch.utils.helper.StringHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author Martin Smock &lt;smock.martin@gmail.com&gt;
*/
@SuppressWarnings("nls")
public class ISO8601 implements DateFormat {
private static final Logger logger = LoggerFactory.getLogger(ISO8601.class);
public static final Date EMPTY_VALUE = parseToDate("-");
public static final ZonedDateTime EMPTY_VALUE_ZONED_DATE = ZonedDateTime
.ofInstant(EMPTY_VALUE.toInstant(), systemDefault());
public static final DateTimeFormatter ISO_LOCAL_DATE;
static {
ISO_LOCAL_DATE = new DateTimeFormatterBuilder().appendValue(YEAR, 4, 10, SignStyle.EXCEEDS_PAD) //
.appendLiteral('-') //
.appendValue(MONTH_OF_YEAR, 2) //
.appendLiteral('-') //
.appendValue(DAY_OF_MONTH, 2) //
.toFormatter();
}
public static final DateTimeFormatter ISO_LOCAL_TIME;
static {
ISO_LOCAL_TIME = new DateTimeFormatterBuilder() //
.appendValue(HOUR_OF_DAY, 2) //
.appendLiteral(':') //
.appendValue(MINUTE_OF_HOUR, 2) //
.optionalStart() //
.appendLiteral(':') //
.appendValue(SECOND_OF_MINUTE, 2) //
.optionalStart() //
.appendFraction(NANO_OF_SECOND, 0, 3, true) //
.toFormatter();
}
public static final DateTimeFormatter ISO_LOCAL_TIME_NO_FRACTIONS;
static {
ISO_LOCAL_TIME_NO_FRACTIONS = new DateTimeFormatterBuilder() //
.appendValue(HOUR_OF_DAY, 2) //
.appendLiteral(':') //
.appendValue(MINUTE_OF_HOUR, 2) //
.optionalStart() //
.appendLiteral(':') //
.appendValue(SECOND_OF_MINUTE, 2) //
.toFormatter();
}
public static final DateTimeFormatter ISO_LOCAL_DATE_TIME;
static {
ISO_LOCAL_DATE_TIME = new DateTimeFormatterBuilder() //
.parseCaseInsensitive() //
.append(ISO_LOCAL_DATE) //
.appendLiteral('T') //
.append(ISO_LOCAL_TIME) //
.toFormatter();
}
public static final DateTimeFormatter ISO_LOCAL_DATE_TIME_NO_FRACTIONS;
static {
ISO_LOCAL_DATE_TIME_NO_FRACTIONS = new DateTimeFormatterBuilder() //
.parseCaseInsensitive() //
.append(ISO_LOCAL_DATE) //
.appendLiteral('T') //
.append(ISO_LOCAL_TIME_NO_FRACTIONS) //
.toFormatter();
}
public static final DateTimeFormatter ISO_OFFSET_DATE_TIME;
static {
ISO_OFFSET_DATE_TIME = new DateTimeFormatterBuilder() //
.parseCaseInsensitive() //
.append(ISO_LOCAL_DATE_TIME) //
.parseLenient() //
.appendOffsetId() //
.parseStrict() //
.toFormatter();
}
public static final DateTimeFormatter ISO_OFFSET_DATE_TIME_ZONE;
static {
ISO_OFFSET_DATE_TIME_ZONE = ISO_OFFSET_DATE_TIME.withZone(ZoneId.systemDefault());
}
public static final DateTimeFormatter ISO_OFFSET_DATE_TIME_ZONE_NO_FRACTIONS;
static {
ISO_OFFSET_DATE_TIME_ZONE_NO_FRACTIONS = new DateTimeFormatterBuilder() //
.parseCaseInsensitive() //
.append(ISO_LOCAL_DATE_TIME_NO_FRACTIONS) //
.parseLenient() //
.appendOffsetId() //
.parseStrict() //
.toFormatter();
}
@Override
public String format(long timePoint) {
if (timePoint == Long.MAX_VALUE || timePoint == Long.MIN_VALUE)
return "-";
try {
Date date = new Date();
date.setTime(timePoint);
return format(date);
} catch (Exception e) {
logger.error(e.getMessage(), e);
return null;
}
}
@Override
public String format(Date date) {
return toString(date);
}
@Override
public long parseLong(String s) {
return parse(s).getTime();
}
@Override
public Date parse(String s) {
return parseToDate(s);
}
public static ZonedDateTime parseToZdt(String s) {
if (StringHelper.isEmpty(s)) {
String msg = "An empty value can not pe parsed to a date!";
throw new IllegalArgumentException(msg);
}
if (s.equals("-"))
return ZonedDateTime.of(1970, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC);
return ZonedDateTime.parse(s, getIso8601Formatter(false));
}
public static Date parseToDate(String s) {
return Date.from(parseToZdt(s).toInstant());
}
public static String toString(LocalDateTime localDateTime) {
return toString(localDateTime.atZone(systemDefault()));
}
public static String toString(ZonedDateTime zonedDateTime) {
return getIso8601Formatter(false).format(zonedDateTime);
}
public static String toString(Date date) {
return getIso8601Formatter(false).format(date.toInstant());
}
public static DateTimeFormatter getIso8601Formatter(boolean noFractions) {
if (noFractions)
return ISO_OFFSET_DATE_TIME_ZONE_NO_FRACTIONS;
return ISO_OFFSET_DATE_TIME_ZONE;
}
public static void main(String[] args) {
System.out.println(toString(ISO8601.parseToZdt("-")));
System.out.println(toString(ZonedDateTime.now()));
System.out.println(toString(LocalDateTime.now()));
}
}