Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package com.sun.tools.javac.util;

 import com.sun.tools.javac.api.Messages;

 import java.lang.ref.SoftReference;

 import java.util.ResourceBundle;

 import java.util.MissingResourceException;

 import java.text.MessageFormat;

 import java.util.HashMap;

 import java.util.Locale;

 import java.util.Map;

 /**

  *  Support for formatted localized messages.

  *

  *  <p><b>This is NOT part of any supported API.

  *  If you write code that depends on this, you do so at your own risk.

  *  This code and its internal interfaces are subject to change or

  *  deletion without notice.</b>

  */

 public class JavacMessages implements Messages {

     /** The context key for the JavacMessages object. */

     public static final Context.Key<JavacMessages> messagesKey =

         new Context.Key<JavacMessages>();

     /** Get the JavacMessages instance for this context. */

     public static JavacMessages instance(Context context) {

         JavacMessages instance = context.get(messagesKey);

         if (instance == null)

             instance = new JavacMessages(context);

         return instance;

     }

     private Map<Locale, SoftReference<List<ResourceBundle>>> bundleCache;

     private List<String> bundleNames;

     private Locale currentLocale;

     private List<ResourceBundle> currentBundles;

     public Locale getCurrentLocale() {

         return currentLocale;

     }

     public void setCurrentLocale(Locale locale) {

         if (locale == null) {

             locale = Locale.getDefault();

         }

         this.currentBundles = getBundles(locale);

         this.currentLocale = locale;

     }

     /** Creates a JavacMessages object.

      */

     public JavacMessages(Context context) {

         this(defaultBundleName, context.get(Locale.class));

         context.put(messagesKey, this);

     }

     /** Creates a JavacMessages object.

      * @param bundleName the name to identify the resource buundle of localized messages.

      */

     public JavacMessages(String bundleName) throws MissingResourceException {

         this(bundleName, null);

     }

     /** Creates a JavacMessages object.

      * @param bundleName the name to identify the resource buundle of localized messages.

      */

     public JavacMessages(String bundleName, Locale locale) throws MissingResourceException {

         bundleNames = List.nil();

         bundleCache = new HashMap<Locale, SoftReference<List<ResourceBundle>>>();

         add(bundleName);

         setCurrentLocale(locale);

     }

     public JavacMessages() throws MissingResourceException {

         this(defaultBundleName);

     }

     public void add(String bundleName) throws MissingResourceException {

         bundleNames = bundleNames.prepend(bundleName);

         if (!bundleCache.isEmpty())

             bundleCache.clear();

         currentBundles = null;

     }

     public List<ResourceBundle> getBundles(Locale locale) {

         if (locale == currentLocale && currentBundles != null)

             return currentBundles;

         SoftReference<List<ResourceBundle>> bundles = bundleCache.get(locale);

         List<ResourceBundle> bundleList = bundles == null ? null : bundles.get();

         if (bundleList == null) {

             bundleList = List.nil();

             for (String bundleName : bundleNames) {

                 try {

                     ResourceBundle rb = ResourceBundle.getBundle(bundleName, locale);

                     bundleList = bundleList.prepend(rb);

                 } catch (MissingResourceException e) {

                     throw new InternalError("Cannot find javac resource bundle for locale " + locale);

                 }

             }

             bundleCache.put(locale, new SoftReference<List<ResourceBundle>>(bundleList));

         }

         return bundleList;

     }

     /** Gets the localized string corresponding to a key, formatted with a set of args.

      */

     public String getLocalizedString(String key, Object... args) {

         return getLocalizedString(currentLocale, key, args);

     }

     public String getLocalizedString(Locale l, String key, Object... args) {

         if (l == null)

             l = getCurrentLocale();

         return getLocalizedString(getBundles(l), key, args);

     }

     /* Static access:

      * javac has a firmly entrenched notion of a default message bundle

      * which it can access from any static context. This is used to get

      * easy access to simple localized strings.

      */

     private static final String defaultBundleName =

         "com.sun.tools.javac.resources.compiler";

     private static ResourceBundle defaultBundle;

     private static JavacMessages defaultMessages;

     /**

      * Gets a localized string from the compiler's default bundle.

      */

     // used to support legacy Log.getLocalizedString

     static String getDefaultLocalizedString(String key, Object... args) {

         return getLocalizedString(List.of(getDefaultBundle()), key, args);

     }

     // used to support legacy static Diagnostic.fragment

     @Deprecated

     static JavacMessages getDefaultMessages() {

         if (defaultMessages == null)

             defaultMessages = new JavacMessages(defaultBundleName);

         return defaultMessages;

     }

     public static ResourceBundle getDefaultBundle() {

         try {

             if (defaultBundle == null)

                 defaultBundle = ResourceBundle.getBundle(defaultBundleName);

             return defaultBundle;

         }

         catch (MissingResourceException e) {

             throw new Error("Fatal: Resource for compiler is missing", e);

         }

     }

     private static String getLocalizedString(List<ResourceBundle> bundles,

                                              String key,

                                              Object... args) {

        String msg = null;

         for (List<ResourceBundle> l = bundles; l.nonEmpty() && msg == null; l = l.tail) {

             ResourceBundle rb = l.head;

             try {

                 msg = rb.getString(key);

             }

             catch (MissingResourceException e) {

                 // ignore, try other bundles in list

             }

         }

         if (msg == null) {

             msg = "compiler message file broken: key=" + key +

                 " arguments={0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}";

         }

         return MessageFormat.format(msg, args);

     }

 }