1 /*
   2  * Copyright (c) 2005, 2011, 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 /*
  27  *******************************************************************************
  28  * (C) Copyright IBM Corp. 1996-2005 - All Rights Reserved                     *
  29  *                                                                             *
  30  * The original version of this source code and documentation is copyrighted   *
  31  * and owned by IBM, These materials are provided under terms of a License     *
  32  * Agreement between IBM and Sun. This technology is protected by multiple     *
  33  * US and International patents. This notice and attribution to IBM may not    *
  34  * to removed.                                                                 *
  35  *******************************************************************************
  36  */
  37 
  38 package sun.text.normalizer;
  39 
  40 import java.io.InputStream;
  41 import java.net.URL;
  42 import java.security.AccessController;
  43 import java.security.PrivilegedAction;
  44 import java.util.MissingResourceException;
  45 
  46 /**
  47  * Provides access to ICU data files as InputStreams.  Implements security checking.
  48  */
  49 public final class ICUData {
  50 
  51     private static InputStream getStream(final Class<ICUData> root, final String resourceName, boolean required) {
  52         InputStream i = null;
  53 
  54         if (System.getSecurityManager() != null) {
  55             i = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {
  56                     public InputStream run() {
  57                         return root.getResourceAsStream(resourceName);
  58                     }
  59                 });
  60         } else {
  61             i = root.getResourceAsStream(resourceName);
  62         }
  63 
  64         if (i == null && required) {
  65             throw new MissingResourceException("could not locate data", root.getPackage().getName(), resourceName);
  66         }
  67         return i;
  68     }
  69 
  70     /*
  71      * Convenience override that calls getStream(ICUData.class, resourceName, false);
  72      */
  73     public static InputStream getStream(String resourceName) {
  74         return getStream(ICUData.class, resourceName, false);
  75     }
  76 
  77     /*
  78      * Convenience method that calls getStream(ICUData.class, resourceName, true).
  79      */
  80     public static InputStream getRequiredStream(String resourceName) {
  81         return getStream(ICUData.class, resourceName, true);
  82     }
  83 }