io.undertow.util.LocaleUtils Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual 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 io.undertow.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
/**
* Utility methods for getting the locale from a request.
*
* @author Stuart Douglas
*/
public class LocaleUtils {
public static Locale getLocaleFromString(String localeString) {
if (localeString == null) {
return null;
}
return Locale.forLanguageTag(localeString);
}
/**
* Parse a header string and return the list of locales that were found.
*
* If the header is empty or null then an empty list will be returned.
*
* @param acceptLanguage The Accept-Language header
* @return The list of locales, in order of preference
*/
public static List getLocalesFromHeader(final String acceptLanguage) {
if(acceptLanguage == null) {
return Collections.emptyList();
}
return getLocalesFromHeader(Collections.singletonList(acceptLanguage));
}
/**
* Parse a header string and return the list of locales that were found.
*
* If the header is empty or null then an empty list will be returned.
*
* @param acceptLanguage The Accept-Language header
* @return The list of locales, in order of preference
*/
public static List getLocalesFromHeader(final List acceptLanguage) {
if (acceptLanguage == null || acceptLanguage.isEmpty()) {
return Collections.emptyList();
}
final List ret = new ArrayList<>();
final List> parsedResults = QValueParser.parse(acceptLanguage);
for (List qvalueResult : parsedResults) {
for (QValueParser.QValueResult res : qvalueResult) {
if (!res.isQValueZero()) {
Locale e = LocaleUtils.getLocaleFromString(res.getValue());
ret.add(e);
}
}
}
return ret;
}
}