1 /*

     2  * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

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

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

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 

    26 package sun.util.locale.provider;

    27 

    28 import java.io.IOException;

    29 import java.io.InputStream;

    30 import java.io.UncheckedIOException;

    31 import java.lang.reflect.Constructor;

    32 import java.lang.reflect.InvocationTargetException;

    33 import java.lang.reflect.Modifier;

    34 import java.lang.reflect.Module;

    35 import java.security.AccessController;

    36 import java.security.PrivilegedAction;

    37 import java.util.PropertyResourceBundle;

    38 import java.util.ResourceBundle;

    39 

    40 /**

    41  * ResourceBundleProviderSupport provides convenience methods for loading

    42  * resource bundles.

    43  */

    44 public class ResourceBundleProviderSupport {

    45     /**

    46      * Loads a {@code ResourceBundle} of the given {@code bundleName} local to

    47      * the given {@code module}.

    48      *

    49      * @apiNote

    50      * {@link Class#forName(Module, String)} does a stack-based permission check.

    51      * Caller of this method is responsible for doing an appropriate permission

    52      * on behalf of the caller before calling this method.

    53      *

    54      * @param module     the module from which the {@code ResourceBundle} is loaded

    55      * @param bundleName the bundle name for the {@code ResourceBundle} class,

    56      *                   such as "com.example.app.MyResources_fr"

    57      * @return the {@code ResourceBundle}, or null if no {@code ResourceBundle} is found

    58      * @throws SecurityException

    59      *         if a security manager exists, it denies loading the class given by

    60      *         {@code bundleName} from the given {@code module}.

    61      *         If the given module is "java.base", this method will not do security check.

    62      * @throws NullPointerException

    63      *         if {@code module} or {@code bundleName) is null

    64      * @see Class#forName(Module, String)

    65      */

    66     public static ResourceBundle loadResourceBundle(Module module, String bundleName)

    67     {

    68         Class<?> c = Class.forName(module, bundleName);

    69         if (c != null && ResourceBundle.class.isAssignableFrom(c)) {

    70             try {

    71                 @SuppressWarnings("unchecked")

    72                 Class<ResourceBundle> bundleClass = (Class<ResourceBundle>) c;

    73                 Constructor<ResourceBundle> ctor = bundleClass.getConstructor();

    74                 if (!Modifier.isPublic(ctor.getModifiers())) {

    75                     return null;

    76                 }

    77                 // java.base may not be able to read the bundleClass's module.

    78                 PrivilegedAction<Void> pa1 = () -> { ctor.setAccessible(true); return null; };

    79                 AccessController.doPrivileged(pa1);

    80                 try {

    81                     return ctor.newInstance((Object[]) null);

    82                 } catch (InvocationTargetException e) {

    83                     uncheckedThrow(e);

    84                 } catch (InstantiationException | IllegalAccessException e) {

    85                     throw new InternalError(e);

    86                 }

    87             } catch (NoSuchMethodException e) {

    88             }

    89         }

    90         return null;

    91     }

    92 

    93     @SuppressWarnings("unchecked")

    94     private static <T extends Throwable> void uncheckedThrow(Throwable t) throws T {

    95        if (t != null)

    96             throw (T)t;

    97        else

    98             throw new Error("Unknown Exception");

    99     }

   100 

   101     /**

   102      * Loads properties of the given {@code bundleName} local to the given

   103      * {@code module} and returns a {@code ResourceBundle} produced from the

   104      * loaded properties.

   105      *

   106      * @apiNote This method is intended for internal use.  Need to refactor.

   107      *

   108      * @param module     the module from which the properties are loaded

   109      * @param bundleName the bundle name of the properties,

   110      *                   such as "com.example.app.MyResources_de"

   111      * @return the {@code ResourceBundle} produced from the loaded properties,

   112      *         or null if no properties are found

   113      * @see PropertyResourceBundle

   114      */

   115     public static ResourceBundle loadPropertyResourceBundle(Module module, String bundleName)

   116             throws IOException

   117     {

   118         String resourceName = toResourceName(bundleName, "properties");

   119         if (resourceName == null) {

   120             return null;

   121         }

   122 

   123         PrivilegedAction<InputStream> pa = () -> {

   124             try {

   125                 return module.getResourceAsStream(resourceName);

   126             } catch (IOException e) {

   127                 throw new UncheckedIOException(e);

   128             }

   129         };

   130         try (InputStream stream = AccessController.doPrivileged(pa)) {

   131             if (stream != null) {

   132                 return new PropertyResourceBundle(stream);

   133             } else {

   134                 return null;

   135             }

   136         } catch (UncheckedIOException e) {

   137             throw e.getCause();

   138         }

   139     }

   140 

   141     private static String toResourceName(String bundleName, String suffix) {

   142         if (bundleName.contains("://")) {

   143             return null;

   144         }

   145         StringBuilder sb = new StringBuilder(bundleName.length() + 1 + suffix.length());

   146         sb.append(bundleName.replace('.', '/')).append('.').append(suffix);

   147         return sb.toString();

   148     }

   149 }