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/*
* JBoss, Home of Professional Open Source.
*
* Copyright 2010 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 org.jboss.logging;
import java.lang.reflect.Field;
import java.security.PrivilegedAction;
import java.util.Locale;
import static java.security.AccessController.doPrivileged;
/**
* A factory class to produce message bundle implementations.
*
* @author David M. Lloyd
*/
public final class Messages {
private Messages() {
}
/**
* Get a message bundle of the given type. Equivalent to {@link #getBundle(Class, java.util.Locale) getBundle}(type, Locale.getDefault()).
*
* @param type the bundle type class
* @param the bundle type
* @return the bundle
*/
public static T getBundle(Class type) {
return getBundle(type, LoggingLocale.getLocale());
}
/**
* Get a message bundle of the given type.
*
* @param type the bundle type class
* @param locale the message locale to use
* @param the bundle type
* @return the bundle
*/
public static T getBundle(final Class type, final Locale locale) {
if (System.getSecurityManager() == null) {
return doGetBundle(type, locale);
}
return doPrivileged(new PrivilegedAction() {
public T run() {
return doGetBundle(type, locale);
}
});
}
private static T doGetBundle(final Class type, final Locale locale) {
String language = locale.getLanguage();
String country = locale.getCountry();
String variant = locale.getVariant();
Class bundleClass = null;
if (variant != null && variant.length() > 0) try {
bundleClass = Class.forName(join(type.getName(), "$bundle", language, country, variant), true, type.getClassLoader()).asSubclass(type);
} catch (ClassNotFoundException e) {
// ignore
}
if (bundleClass == null && country != null && country.length() > 0) try {
bundleClass = Class.forName(join(type.getName(), "$bundle", language, country, null), true, type.getClassLoader()).asSubclass(type);
} catch (ClassNotFoundException e) {
// ignore
}
if (bundleClass == null && language != null && language.length() > 0) try {
bundleClass = Class.forName(join(type.getName(), "$bundle", language, null, null), true, type.getClassLoader()).asSubclass(type);
} catch (ClassNotFoundException e) {
// ignore
}
if (bundleClass == null) try {
bundleClass = Class.forName(join(type.getName(), "$bundle", null, null, null), true, type.getClassLoader()).asSubclass(type);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Invalid bundle " + type + " (implementation not found)");
}
final Field field;
try {
field = bundleClass.getField("INSTANCE");
} catch (NoSuchFieldException e) {
throw new IllegalArgumentException("Bundle implementation " + bundleClass + " has no instance field");
}
try {
return type.cast(field.get(null));
} catch (IllegalAccessException e) {
throw new IllegalArgumentException("Bundle implementation " + bundleClass + " could not be instantiated", e);
}
}
private static String join(String interfaceName, String a, String b, String c, String d) {
final StringBuilder build = new StringBuilder();
build.append(interfaceName).append('_').append(a);
if (b != null && b.length() > 0) {
build.append('_');
build.append(b);
}
if (c != null && c.length() > 0) {
build.append('_');
build.append(c);
}
if (d != null && d.length() > 0) {
build.append('_');
build.append(d);
}
return build.toString();
}
}
