/*
* JBoss, Home of Professional Open Source.
*
* Copyright 2017 Red Hat, Inc.
*
* 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.jboss.logging;
import java.util.Locale;
A simple utility to resolve the default locale to use for internationalized loggers and message bundles.
Author: James R. Perkins
/**
* A simple utility to resolve the default locale to use for internationalized loggers and message bundles.
*
* @author <a href="mailto:jperkins@redhat.com">James R. Perkins</a>
*/
@SuppressWarnings("SameParameterValue")
class LoggingLocale {
private static final Locale LOCALE = getDefaultLocale();
Attempts to create a Locale based on the org.jboss.logging.locale system property. If the value is not defined the default locale will be used.
The value should be in the BCP 47 format.
Note: Currently this uses a custom parser to attempt to parse the BCP 47 format. This will be changed to use the Locale.forLanguageTag() once a move to JDK 7. Currently only the language, region and variant are used to construct the locale.
Returns: the locale created or the default locale
/**
* Attempts to create a {@link Locale} based on the {@code org.jboss.logging.locale} system property. If the value
* is not defined the {@linkplain Locale#getDefault() default locale} will be used.
* <p>
* The value should be in the <a href="https://tools.ietf.org/html/bcp47">BCP 47</a> format.
* </p>
* <p>
* <strong>Note:</strong> Currently this uses a custom parser to attempt to parse the BCP 47 format. This will be
* changed to use the {@code Locale.forLanguageTag()} once a move to JDK 7. Currently only the language, region and
* variant are used to construct the locale.
* </p>
*
* @return the locale created or the default locale
*/
static Locale getLocale() {
return LOCALE;
}
private static Locale getDefaultLocale() {
final String bcp47Tag = SecurityActions.getSystemProperty("org.jboss.logging.locale", "");
if (bcp47Tag.trim().isEmpty()) {
return Locale.getDefault();
}
// When we upgrade to Java 7 we can use the Locale.forLanguageTag(locale) which will reliably parse the
// the value. For now we have to attempt to parse it the best we can.
return forLanguageTag(bcp47Tag);
}
private static Locale forLanguageTag(final String locale) {
// First check known locales
if ("en-CA".equalsIgnoreCase(locale)) {
return Locale.CANADA;
} else if ("fr-CA".equalsIgnoreCase(locale)) {
return Locale.CANADA_FRENCH;
} else if ("zh".equalsIgnoreCase(locale)) {
return Locale.CHINESE;
} else if ("en".equalsIgnoreCase(locale)) {
return Locale.ENGLISH;
} else if ("fr-FR".equalsIgnoreCase(locale)) {
return Locale.FRANCE;
} else if ("fr".equalsIgnoreCase(locale)) {
return Locale.FRENCH;
} else if ("de".equalsIgnoreCase(locale)) {
return Locale.GERMAN;
} else if ("de-DE".equalsIgnoreCase(locale)) {
return Locale.GERMANY;
} else if ("it".equalsIgnoreCase(locale)) {
return Locale.ITALIAN;
} else if ("it-IT".equalsIgnoreCase(locale)) {
return Locale.ITALY;
} else if ("ja-JP".equalsIgnoreCase(locale)) {
return Locale.JAPAN;
} else if ("ja".equalsIgnoreCase(locale)) {
return Locale.JAPANESE;
} else if ("ko-KR".equalsIgnoreCase(locale)) {
return Locale.KOREA;
} else if ("ko".equalsIgnoreCase(locale)) {
return Locale.KOREAN;
} else if ("zh-CN".equalsIgnoreCase(locale)) {
return Locale.SIMPLIFIED_CHINESE;
} else if ("zh-TW".equalsIgnoreCase(locale)) {
return Locale.TRADITIONAL_CHINESE;
} else if ("en-UK".equalsIgnoreCase(locale)) {
return Locale.UK;
} else if ("en-US".equalsIgnoreCase(locale)) {
return Locale.US;
}
// Split the string into parts and attempt
final String[] parts = locale.split("-");
final int len = parts.length;
int index = 0;
int count = 0;
final String language = parts[index++];
String region = ""; // country
String variant = "";
// The next 3 sections may be extended languages, we're just going to ignore them
while (index < len) {
if (count++ == 2 || !isAlpha(parts[index], 3, 3)) {
break;
}
index++;
}
// Check for a script, we'll skip it however a script is not supported until Java 7
if (index != len && isAlpha(parts[index], 4, 4)) {
index++;
}
// Next should be the region, 3 digit is allowed but may not work with Java 6
if (index != len && (isAlpha(parts[index], 2, 2) || isNumeric(parts[index], 3, 3))) {
region = parts[index++];
}
// Next should be the variant and we will just use the first one found, all other parts will be ignored
if (index != len && (isAlphaOrNumeric(parts[index], 5, 8))) {
variant = parts[index];
}
return new Locale(language, region, variant);
}
private static boolean isAlpha(final String value, final int minLen, final int maxLen) {
final int len = value.length();
if (len < minLen || len > maxLen) {
return false;
}
for (int i = 0; i < len; i++) {
if (!Character.isLetter(value.charAt(i))) {
return false;
}
}
return true;
}
private static boolean isNumeric(final String value, final int minLen, final int maxLen) {
final int len = value.length();
if (len < minLen || len > maxLen) {
return false;
}
for (int i = 0; i < len; i++) {
if (!Character.isDigit(value.charAt(i))) {
return false;
}
}
return true;
}
private static boolean isAlphaOrNumeric(final String value, final int minLen, final int maxLen) {
final int len = value.length();
if (len < minLen || len > maxLen) {
return false;
}
for (int i = 0; i < len; i++) {
if (!Character.isLetterOrDigit(value.charAt(i))) {
return false;
}
}
return true;
}
}