DateTimeFormatterUtil.java
/*
* Copyright 2021 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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 org.keycloak.theme;
import org.jboss.logging.Logger;
import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Optional;
/**
* Util class for localized date and time representation
*
* @author <a href="mailto:mabartos@redhat.com">Martin Bartos</a>
*/
public class DateTimeFormatterUtil {
private static final Logger log = Logger.getLogger(DateTimeFormatterUtil.class);
public static String getDateTimeFromMillis(long millis) {
return getDateTimeFromMillis(millis, Locale.ENGLISH);
}
public static String getDateTimeFromMillis(long millis, String locale) {
return getDateTimeFromMillis(millis, getLocaleFromString(locale));
}
public static String getDateTimeFromMillis(long millis, Locale locale) {
return getDateTimeFromMillis(millis, getDefaultDateFormat(locale));
}
/**
* Get string representation of localized date and time
*
* @param millis number of milliseconds passed since January 1, 1970, 00:00:00 GMT
* @param dateFormat format of date and time. See {@link DateFormat}
* @return string representation
*/
public static String getDateTimeFromMillis(long millis, DateFormat dateFormat) {
if (dateFormat == null) return null;
return dateFormat.format(new Date(millis));
}
public static Locale getLocaleFromString(String locale) {
return getLocaleFromString(locale, Locale.ENGLISH);
}
/**
* Parse {@link Locale} from string
*
* @param locale required locale
* @param defaultValue default value if the locale parameter is invalid
* @return Locale
*/
public static Locale getLocaleFromString(String locale, Locale defaultValue) {
try {
return Optional.ofNullable(locale)
.map(Locale::new)
.orElse(defaultValue);
} catch (Exception e) {
log.debugf("Invalid locale '%s'", locale);
}
return defaultValue;
}
public static DateFormat getDefaultDateFormat() {
return getDefaultDateFormat(Locale.ENGLISH);
}
public static DateFormat getDefaultDateFormat(Locale locale) {
return DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.SHORT, locale);
}
}