1 /*
   2  * Copyright (c) 2004, 2013, 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 org.xml.sax.helpers;
  27 
  28 import java.io.*;
  29 import java.security.*;
  30 
  31 /**
  32  * This class is duplicated for each JAXP subpackage so keep it in sync.
  33  * It is package private and therefore is not exposed as part of the JAXP
  34  * API.
  35  *
  36  * Security related methods that only work on J2SE 1.2 and newer.
  37  */
  38 class SecuritySupport  {
  39 
  40 
  41     ClassLoader getContextClassLoader() throws SecurityException{
  42         return (ClassLoader)
  43                 AccessController.doPrivileged(new PrivilegedAction() {
  44             public Object run() {
  45                 ClassLoader cl = null;
  46                 //try {
  47                 cl = Thread.currentThread().getContextClassLoader();
  48                 //} catch (SecurityException ex) { }
  49 
  50                 if (cl == null)
  51                     cl = ClassLoader.getSystemClassLoader();
  52 
  53                 return cl;
  54             }
  55         });
  56     }
  57 
  58     String getSystemProperty(final String propName) {
  59         return (String)
  60             AccessController.doPrivileged(new PrivilegedAction() {
  61                 public Object run() {
  62                     return System.getProperty(propName);
  63                 }
  64             });
  65     }
  66 
  67     FileInputStream getFileInputStream(final File file)
  68         throws FileNotFoundException
  69     {
  70         try {
  71             return (FileInputStream)
  72                 AccessController.doPrivileged(new PrivilegedExceptionAction() {
  73                     public Object run() throws FileNotFoundException {
  74                         return new FileInputStream(file);
  75                     }
  76                 });
  77         } catch (PrivilegedActionException e) {
  78             throw (FileNotFoundException)e.getException();
  79         }
  80     }
  81 
  82     InputStream getResourceAsStream(final ClassLoader cl,
  83                                            final String name)
  84     {
  85         return (InputStream)
  86             AccessController.doPrivileged(new PrivilegedAction() {
  87                 public Object run() {
  88                     InputStream ris;
  89                     if (cl == null) {
  90                         ris = SecuritySupport.class.getResourceAsStream(name);
  91                     } else {
  92                         ris = cl.getResourceAsStream(name);
  93                     }
  94                     return ris;
  95                 }
  96             });
  97     }
  98 
  99     boolean doesFileExist(final File f) {
 100     return ((Boolean)
 101             AccessController.doPrivileged(new PrivilegedAction() {
 102                 public Object run() {
 103                     return new Boolean(f.exists());
 104                 }
 105             })).booleanValue();
 106     }
 107 
 108 }