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GitLab4J-API (gitlab4j-api) provides a full featured Java client library for working with GitLab repositories and servers via the GitLab REST API.
package org.gitlab4j.api.utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;
import java.util.Calendar;
import java.util.Date;
import java.util.Map;
import java.util.TimeZone;
import java.util.concurrent.ConcurrentHashMap;
/**
* This class provides utility methods for parsing and formatting ISO8601 formatted dates.
*/
public class ISO8601 {
public static final String PATTERN = "yyyy-MM-dd'T'HH:mm:ssZ";
public static final String MSEC_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
public static final String SPACEY_PATTERN = "yyyy-MM-dd HH:mm:ss Z";
public static final String SPACEY_MSEC_PATTERN = "yyyy-MM-dd HH:mm:ss.SSS Z";
public static final String PATTERN_MSEC = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
public static final String OUTPUT_PATTERN = "yyyy-MM-dd'T'HH:mm:ss'Z'";
public static final String OUTPUT_MSEC_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
public static final String UTC_PATTERN = "yyyy-MM-dd HH:mm:ss 'UTC'";
private static final DateTimeFormatter ODT_WITH_MSEC_PARSER = new DateTimeFormatterBuilder().appendPattern("yyyy-MM-dd[['T'][ ]HH:mm:ss.SSS[ ][XXXXX][XXXX]]").toFormatter();
private static final DateTimeFormatter ODT_PARSER = new DateTimeFormatterBuilder().appendPattern("yyyy-MM-dd[['T'][ ]HH:mm:ss[.SSS][ ][X][XXX]]")
.parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
.parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
.parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0)
.parseDefaulting(ChronoField.MILLI_OF_SECOND, 0)
.parseDefaulting(ChronoField.OFFSET_SECONDS, 0)
.toFormatter();
// Set up ThreadLocal storage to save a thread local SimpleDateFormat keyed with the format string
private static final class SafeDateFormatter {
private static final ThreadLocal> safeFormats = new ThreadLocal>() {
@Override
public Map initialValue() {
return (new ConcurrentHashMap<>());
}
};
private static SimpleDateFormat getDateFormat(String formatSpec) {
Map formatMap = safeFormats.get();
SimpleDateFormat format = formatMap.get(formatSpec);
if (format == null) {
format = new SimpleDateFormat(formatSpec);
format.setLenient(true);
format.setTimeZone(TimeZone.getTimeZone("UTC"));
formatMap.put(formatSpec, format);
}
return (format);
}
}
/**
* Get a ISO8601 formatted string for the current date and time.
*
* @return a ISO8601 formatted string for the current date and time
*/
public static String getTimestamp() {
return (SafeDateFormatter.getDateFormat(PATTERN).format(new Date()));
}
/**
* Get a ISO8601formatted string for the current date and time.
*
* @param withMsec flag indicating whether to include milliseconds
* @return a ISO8601 formatted string for the current date and time
*/
public static String getTimestamp(boolean withMsec) {
return (withMsec ? SafeDateFormatter.getDateFormat(PATTERN_MSEC).format(new Date()) :
SafeDateFormatter.getDateFormat(PATTERN).format(new Date()));
}
/**
* Get a ISO8601 formatted string for the provided Calendar instance.
*
* @param cal the Calendar instance to get the ISO8601 formatted string for
* @return a ISO8601 formatted string for the provided Calendar instance, or null if call is null
*/
public static String toString(Calendar cal) {
if (cal == null) {
return (null);
}
return (toString(cal.getTime()));
}
/**
* Get a ISO8601 formatted string for the provided Date instance.
*
* @param date the Date instance to get the ISO8601 formatted string for
* @param withMsec flag indicating whether to include milliseconds
* @return a ISO8601 formatted string for the provided Date instance, or null if date is null
*/
public static String toString(Date date, boolean withMsec) {
if (date == null) {
return (null);
}
long time = date.getTime();
return (withMsec && time % 1000 != 0 ?
SafeDateFormatter.getDateFormat(OUTPUT_MSEC_PATTERN).format(date) :
SafeDateFormatter.getDateFormat(OUTPUT_PATTERN).format(date));
}
/**
* Get a ISO8601 formatted string for the provided Date instance.
*
* @param date the Date instance to get the ISO8601 formatted string for
* @return a ISO8601 formatted string for the provided Date instance, or null if date is null
*/
public static String toString(Date date) {
return (toString(date, true));
}
/**
* Parses an ISO8601 formatted string a returns an Instant instance.
*
* @param dateTimeString the ISO8601 formatted string
* @return an Instant instance for the ISO8601 formatted string
* @throws ParseException if the provided string is not in the proper format
*/
public static Instant toInstant(String dateTimeString) throws ParseException {
if (dateTimeString == null) {
return (null);
}
dateTimeString = dateTimeString.trim();
if (dateTimeString.endsWith("Z")) {
return (Instant.parse(dateTimeString));
} else {
// Convert UTC zoned dates to 0 offset date
if (dateTimeString.endsWith("UTC")) {
dateTimeString = dateTimeString.replace("UTC", "+0000");
}
OffsetDateTime odt = (dateTimeString.length() > 25 ?
OffsetDateTime.parse(dateTimeString, ODT_WITH_MSEC_PARSER) :
OffsetDateTime.parse(dateTimeString, ODT_PARSER));
return (odt.toInstant());
}
}
/**
* Parses an ISO8601 formatted string a returns a Date instance.
*
* @param dateTimeString the ISO8601 formatted string
* @return a Date instance for the ISO8601 formatted string
* @throws ParseException if the provided string is not in the proper format
*/
public static Date toDate(String dateTimeString) throws ParseException {
Instant instant = toInstant(dateTimeString);
return (instant != null ? Date.from(instant) : null);
}
/**
* Parses an ISO8601 formatted string a returns a Calendar instance.
*
* @param dateTimeString the ISO8601 formatted string
* @return a Calendar instance for the ISO8601 formatted string
* @throws ParseException if the provided string is not in the proper format
*/
public static Calendar toCalendar(String dateTimeString) throws ParseException {
Date date = toDate(dateTimeString);
if (date == null) {
return (null);
}
Calendar cal = Calendar.getInstance();
cal.setTime(date);
return (cal);
}
}