org.jboss.logging.Messages Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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();
}
}