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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 static java.security.AccessController.doPrivileged;

A factory class to produce message bundle implementations.

Author(s):
David M. Lloyd
 
 public final class Messages {
 
     private Messages() {
     }

    
Get a message bundle of the given type. Equivalent to getBundle(type, Locale.getDefault()).

Parameters:
type the bundle type class
<T> the bundle type
Returns:
the bundle
 
     public static <T> T getBundle(Class<T> type) {
         return getBundle(type, Locale.getDefault());
     }

    
Get a message bundle of the given type.

Parameters:
type the bundle type class
locale the message locale to use
<T> the bundle type
Returns:
the bundle
 
     public static <T> T getBundle(final Class<T> typefinal Locale locale) {
         return doPrivileged(new PrivilegedAction<T>() {
             public T run() {
                 String language = locale.getLanguage();
                 String country = locale.getCountry();
                 String variant = locale.getVariant();
 
                 Class<? extends T> bundleClass = null;
                 if (variant != null && variant.length() > 0) try {
                     bundleClass = Class.forName(join(type.getName(), "$bundle"languagecountryvariant), truetype.getClassLoader()).asSubclass(type);
                 } catch (ClassNotFoundException e) {
                     // ignore
                 }
                 if (bundleClass == null && country != null && country.length() > 0) try {
                     bundleClass = Class.forName(join(type.getName(), "$bundle"languagecountrynull), truetype.getClassLoader()).asSubclass(type);
                 } catch (ClassNotFoundException e) {
                     // ignore
                 }
                 if (bundleClass == null && language != null && language.length() > 0) try {
                     bundleClass = Class.forName(join(type.getName(), "$bundle"languagenullnull), truetype.getClassLoader()).asSubclass(type);
                 } catch (ClassNotFoundException e) {
                     // ignore
                 }
                 if (bundleClass == nulltry {
                     bundleClass = Class.forName(join(type.getName(), "$bundle"nullnullnull), truetype.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 interfaceNameString aString bString cString 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();
    }
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