1 /*
   2  * Copyright (c) 2012, 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.security.AccessController;
  29 import java.security.PrivilegedActionException;
  30 import java.security.PrivilegedExceptionAction;
  31 import java.util.ServiceLoader;
  32 import java.util.spi.LocaleServiceProvider;
  33 
  34 /**
  35  * LocaleProviderAdapter implementation for the installed SPI implementations.
  36  *
  37  * @author Naoto Sato
  38  * @author Masayoshi Okutsu
  39  */
  40 public class SPILocaleProviderAdapter extends AuxLocaleProviderAdapter {
  41 
  42     /**
  43      * Returns the type of this LocaleProviderAdapter
  44      */
  45     @Override
  46     public LocaleProviderAdapter.Type getAdapterType() {
  47         return LocaleProviderAdapter.Type.SPI;
  48     }
  49 
  50     @Override
  51     protected <P extends LocaleServiceProvider> P findInstalledProvider(final Class<P> c) {
  52         try {
  53             return AccessController.doPrivileged(new PrivilegedExceptionAction<P>() {
  54                 @Override
  55                 @SuppressWarnings("unchecked")
  56                 public P run() {
  57                     P lsp = null;
  58                     for (LocaleServiceProvider provider : ServiceLoader.loadInstalled(c)) {
  59                         lsp = (P) provider;
  60                     }
  61                     return lsp;
  62                 }
  63             });
  64         }  catch (PrivilegedActionException e) {
  65             LocaleServiceProviderPool.config(SPILocaleProviderAdapter.class, e.toString());
  66         }
  67         return null;
  68     }
  69 }