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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
// © 2022 and later: Unicode, Inc. and others.
// License & terms of use: https://www.unicode.org/copyright.html
package com.ibm.icu.message2;
import java.util.Calendar;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.ibm.icu.text.DateFormat;
/**
* Creates a {@link Formatter} doing formatting of date / time, similar to
* {exp, date} and {exp, time} in {@link com.ibm.icu.text.MessageFormat}.
*/
class DateTimeFormatterFactory implements FormatterFactory {
private final String kind;
// "datetime", "date", "time"
DateTimeFormatterFactory(String kind) {
switch (kind) {
case "date":
break;
case "time":
break;
case "datetime":
break;
default:
kind = "datetime";
}
this.kind = kind;
}
private static int stringToStyle(String option) {
switch (option) {
case "full":
return DateFormat.FULL;
case "long":
return DateFormat.LONG;
case "medium":
return DateFormat.MEDIUM;
case "short":
return DateFormat.SHORT;
default:
throw new IllegalArgumentException("Invalid datetime style: " + option);
}
}
/**
* {@inheritDoc}
*
* @throws IllegalArgumentException when something goes wrong
* (for example conflicting options, invalid option values, etc.)
*/
@Override
public Formatter createFormatter(Locale locale, Map fixedOptions) {
int dateStyle = DateFormat.NONE;
int timeStyle = DateFormat.NONE;
switch (kind) {
case "date":
dateStyle = getDateTimeStyle(fixedOptions, "style");
break;
case "time":
timeStyle = getDateTimeStyle(fixedOptions, "style");
break;
case "datetime": // $FALL-THROUGH$
default:
dateStyle = getDateTimeStyle(fixedOptions, "dateStyle");
timeStyle = getDateTimeStyle(fixedOptions, "timeStyle");
break;
}
// TODO: how to handle conflicts. What if we have both skeleton and style, or pattern?
if (dateStyle == DateFormat.NONE && timeStyle == DateFormat.NONE) {
String skeleton = "";
switch (kind) {
case "date":
skeleton = getDateFieldOptions(fixedOptions);
break;
case "time":
skeleton = getTimeFieldOptions(fixedOptions);
break;
case "datetime": // $FALL-THROUGH$
default:
skeleton = getDateFieldOptions(fixedOptions);
skeleton += getTimeFieldOptions(fixedOptions);
break;
}
if (skeleton.isEmpty()) {
// Custom option, icu namespace
skeleton = OptUtils.getString(fixedOptions, "icu:skeleton", "");
}
if (!skeleton.isEmpty()) {
DateFormat df = DateFormat.getInstanceForSkeleton(skeleton, locale);
return new DateTimeFormatter(locale, df);
}
// No skeletons, custom or otherwise, match fallback to short / short as per spec.
switch (kind) {
case "date":
dateStyle = DateFormat.SHORT;
timeStyle = DateFormat.NONE;
break;
case "time":
dateStyle = DateFormat.NONE;
timeStyle = DateFormat.SHORT;
break;
case "datetime": // $FALL-THROUGH$
default:
dateStyle = DateFormat.SHORT;
timeStyle = DateFormat.SHORT;
}
}
DateFormat df = DateFormat.getDateTimeInstance(dateStyle, timeStyle, locale);
return new DateTimeFormatter(locale, df);
}
private static int getDateTimeStyle(Map options, String key) {
String opt = OptUtils.getString(options, key);
if (opt != null) {
return stringToStyle(opt);
}
return DateFormat.NONE;
}
private static String getDateFieldOptions(Map options) {
StringBuilder skeleton = new StringBuilder();
String opt;
// In all the switches below we just ignore invalid options.
// Would be nice to report (log?), but ICU does not have a clear policy on how to do that.
// But we don't want to throw, that is too drastic.
opt = OptUtils.getString(options, "weekday", "");
switch (opt) {
case "long":
skeleton.append("EEEE");
break;
case "short":
skeleton.append("E");
break;
case "narrow":
skeleton.append("EEEEEE");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "era", "");
switch (opt) {
case "long":
skeleton.append("GGGG");
break;
case "short":
skeleton.append("G");
break;
case "narrow":
skeleton.append("GGGGG");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "year", "");
switch (opt) {
case "numeric":
skeleton.append("y");
break;
case "2-digit":
skeleton.append("yy");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "month", "");
switch (opt) {
case "numeric":
skeleton.append("M");
break;
case "2-digit":
skeleton.append("MM");
break;
case "long":
skeleton.append("MMMM");
break;
case "short":
skeleton.append("MMM");
break;
case "narrow":
skeleton.append("MMMMM");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "day", "");
switch (opt) {
case "numeric":
skeleton.append("d");
break;
case "2-digit":
skeleton.append("dd");
break;
default:
// invalid value, we just ignore it.
}
return skeleton.toString();
}
private static String getTimeFieldOptions(Map options) {
StringBuilder skeleton = new StringBuilder();
String opt;
// In all the switches below we just ignore invalid options.
// Would be nice to report (log?), but ICU does not have a clear policy on how to do that.
// But we don't want to throw, that is too drastic.
int showHour = 0;
opt = OptUtils.getString(options, "hour", "");
switch (opt) {
case "numeric":
showHour = 1;
break;
case "2-digit":
showHour = 2;
break;
default:
// invalid value, we just ignore it.
}
if (showHour > 0) {
String hourCycle = "";
opt = OptUtils.getString(options, "hourCycle", "");
switch (opt) {
case "h11":
hourCycle = "K";
break;
case "h12":
hourCycle = "h";
break;
case "h23":
hourCycle = "H";
break;
case "h24":
hourCycle = "k";
break;
default:
hourCycle = "j"; // default for the locale
}
skeleton.append(hourCycle);
if (showHour == 2) {
skeleton.append(hourCycle);
}
}
opt = OptUtils.getString(options, "minute", "");
switch (opt) {
case "numeric":
skeleton.append("m");
break;
case "2-digit":
skeleton.append("mm");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "second", "");
switch (opt) {
case "numeric":
skeleton.append("s");
break;
case "2-digit":
skeleton.append("ss");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "fractionalSecondDigits", "");
switch (opt) {
case "1":
skeleton.append("S");
break;
case "2":
skeleton.append("SS");
break;
case "3":
skeleton.append("SSS");
break;
default:
// invalid value, we just ignore it.
}
opt = OptUtils.getString(options, "timeZoneName", "");
switch (opt) {
case "long":
skeleton.append("z");
break;
case "short":
skeleton.append("zzzz");
break;
case "shortOffset":
skeleton.append("O");
break;
case "longOffset":
skeleton.append("OOOO");
break;
case "shortGeneric":
skeleton.append("v");
break;
case "longGeneric":
skeleton.append("vvvv");
break;
default:
// invalid value, we just ignore it.
}
return skeleton.toString();
}
private static class DateTimeFormatter implements Formatter {
private final DateFormat icuFormatter;
private final Locale locale;
private DateTimeFormatter(Locale locale, DateFormat df) {
this.locale = locale;
this.icuFormatter = df;
}
/**
* {@inheritDoc}
*/
@Override
public FormattedPlaceholder format(Object toFormat, Map variableOptions) {
// TODO: use a special type to indicate function without input argument.
if (toFormat == null) {
return null;
}
if (toFormat instanceof CharSequence) {
toFormat = parseIso8601(toFormat.toString());
// We were unable to parse the input as iso date
if (toFormat instanceof CharSequence) {
return new FormattedPlaceholder(
toFormat, new PlainStringFormattedValue("{|" + toFormat + "|}"));
}
}
if (toFormat instanceof Calendar) {
TimeZone tz = ((Calendar) toFormat).getTimeZone();
long milis = ((Calendar) toFormat).getTimeInMillis();
com.ibm.icu.util.TimeZone icuTz = com.ibm.icu.util.TimeZone.getTimeZone(tz.getID());
com.ibm.icu.util.Calendar calendar =
com.ibm.icu.util.Calendar.getInstance(icuTz, locale);
calendar.setTimeInMillis(milis);
toFormat = calendar;
}
String result = icuFormatter.format(toFormat);
return new FormattedPlaceholder(toFormat, new PlainStringFormattedValue(result));
}
/**
* {@inheritDoc}
*/
@Override
public String formatToString(Object toFormat, Map variableOptions) {
FormattedPlaceholder result = format(toFormat, variableOptions);
return result != null ? result.toString() : null;
}
}
private final static Pattern ISO_PATTERN = Pattern.compile(
"^(([0-9]{4})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])){1}(T([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]{1,3})?(Z|[+-]((0[0-9]|1[0-3]):[0-5][0-9]|14:00))?)?$");
private static Integer safeParse(String str) {
if (str == null || str.isEmpty())
return null;
return Integer.parseInt(str);
}
private static Object parseIso8601(String text) {
Matcher m = ISO_PATTERN.matcher(text);
if (m.find() && m.groupCount() == 12 && !m.group().isEmpty()) {
Integer year = safeParse(m.group(2));
Integer month = safeParse(m.group(3));
Integer day = safeParse(m.group(4));
Integer hour = safeParse(m.group(6));
Integer minute = safeParse(m.group(7));
Integer second = safeParse(m.group(8));
Integer millisecond = 0;
if (m.group(9) != null) {
String z = (m.group(9) + "000").substring(1, 4);
millisecond = safeParse(z);
} else {
millisecond = 0;
}
String tzPart = m.group(10);
if (hour == null) {
hour = 0;
minute = 0;
second = 0;
}
com.ibm.icu.util.GregorianCalendar gc = new com.ibm.icu.util.GregorianCalendar(
year, month - 1, day, hour, minute, second);
gc.set(com.ibm.icu.util.Calendar.MILLISECOND, millisecond);
if (tzPart != null) {
if (tzPart.equals("Z")) {
gc.setTimeZone(com.ibm.icu.util.TimeZone.GMT_ZONE);
} else {
int sign = tzPart.startsWith("-") ? -1 : 1;
String[] tzParts = tzPart.substring(1).split(":");
if (tzParts.length == 2) {
Integer tzHour = safeParse(tzParts[0]);
Integer tzMin = safeParse(tzParts[1]);
if (tzHour != null && tzMin != null) {
int offset = sign * (tzHour * 60 + tzMin) * 60 * 1000;
gc.setTimeZone(new com.ibm.icu.util.SimpleTimeZone(offset, "offset"));
}
}
}
}
return gc;
}
return text;
}
}