1 /*
   2  * Copyright (c) 2002, 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 sun.misc;
  27 
  28 import java.util.jar.JarFile;
  29 import java.io.Console;
  30 import java.io.FileDescriptor;
  31 import java.security.ProtectionDomain;
  32 
  33 import java.security.AccessController;
  34 
  35 /** A repository of "shared secrets", which are a mechanism for
  36     calling implementation-private methods in another package without
  37     using reflection. A package-private class implements a public
  38     interface and provides the ability to call package-private methods
  39     within that package; the object implementing that interface is
  40     provided through a third package to which access is restricted.
  41     This framework avoids the primary disadvantage of using reflection
  42     for this purpose, namely the loss of compile-time checking. */
  43 
  44 public class SharedSecrets {
  45     private static final Unsafe unsafe = Unsafe.getUnsafe();
  46     private static JavaUtilJarAccess javaUtilJarAccess;
  47     private static JavaLangAccess javaLangAccess;
  48     private static JavaLangRefAccess javaLangRefAccess;
  49     private static JavaIOAccess javaIOAccess;
  50     private static JavaNetAccess javaNetAccess;
  51     private static JavaNetHttpCookieAccess javaNetHttpCookieAccess;
  52     private static JavaNioAccess javaNioAccess;
  53     private static JavaIOFileDescriptorAccess javaIOFileDescriptorAccess;
  54     private static JavaSecurityProtectionDomainAccess javaSecurityProtectionDomainAccess;
  55     private static JavaSecurityAccess javaSecurityAccess;
  56     private static JavaUtilZipFileAccess javaUtilZipFileAccess;
  57     private static JavaAWTAccess javaAWTAccess;
  58 
  59     public static JavaUtilJarAccess javaUtilJarAccess() {
  60         if (javaUtilJarAccess == null) {
  61             // Ensure JarFile is initialized; we know that that class
  62             // provides the shared secret
  63             unsafe.ensureClassInitialized(JarFile.class);
  64         }
  65         return javaUtilJarAccess;
  66     }
  67 
  68     public static void setJavaUtilJarAccess(JavaUtilJarAccess access) {
  69         javaUtilJarAccess = access;
  70     }
  71 
  72     public static void setJavaLangAccess(JavaLangAccess jla) {
  73         javaLangAccess = jla;
  74     }
  75 
  76     public static JavaLangAccess getJavaLangAccess() {
  77         return javaLangAccess;
  78     }
  79 
  80     public static void setJavaLangRefAccess(JavaLangRefAccess jlra) {
  81         javaLangRefAccess = jlra;
  82     }
  83 
  84     public static JavaLangRefAccess getJavaLangRefAccess() {
  85         return javaLangRefAccess;
  86     }
  87 
  88     public static void setJavaNetAccess(JavaNetAccess jna) {
  89         javaNetAccess = jna;
  90     }
  91 
  92     public static JavaNetAccess getJavaNetAccess() {
  93         return javaNetAccess;
  94     }
  95 
  96     public static void setJavaNetHttpCookieAccess(JavaNetHttpCookieAccess a) {
  97         javaNetHttpCookieAccess = a;
  98     }
  99 
 100     public static JavaNetHttpCookieAccess getJavaNetHttpCookieAccess() {
 101         if (javaNetHttpCookieAccess == null)
 102             unsafe.ensureClassInitialized(java.net.HttpCookie.class);
 103         return javaNetHttpCookieAccess;
 104     }
 105 
 106     public static void setJavaNioAccess(JavaNioAccess jna) {
 107         javaNioAccess = jna;
 108     }
 109 
 110     public static JavaNioAccess getJavaNioAccess() {
 111         if (javaNioAccess == null) {
 112             // Ensure java.nio.ByteOrder is initialized; we know that
 113             // this class initializes java.nio.Bits that provides the
 114             // shared secret.
 115             unsafe.ensureClassInitialized(java.nio.ByteOrder.class);
 116         }
 117         return javaNioAccess;
 118     }
 119 
 120     public static void setJavaIOAccess(JavaIOAccess jia) {
 121         javaIOAccess = jia;
 122     }
 123 
 124     public static JavaIOAccess getJavaIOAccess() {
 125         if (javaIOAccess == null) {
 126             unsafe.ensureClassInitialized(Console.class);
 127         }
 128         return javaIOAccess;
 129     }
 130 
 131     public static void setJavaIOFileDescriptorAccess(JavaIOFileDescriptorAccess jiofda) {
 132         javaIOFileDescriptorAccess = jiofda;
 133     }
 134 
 135     public static JavaIOFileDescriptorAccess getJavaIOFileDescriptorAccess() {
 136         if (javaIOFileDescriptorAccess == null)
 137             unsafe.ensureClassInitialized(FileDescriptor.class);
 138 
 139         return javaIOFileDescriptorAccess;
 140     }
 141 
 142     public static void setJavaSecurityProtectionDomainAccess
 143         (JavaSecurityProtectionDomainAccess jspda) {
 144             javaSecurityProtectionDomainAccess = jspda;
 145     }
 146 
 147     public static JavaSecurityProtectionDomainAccess
 148         getJavaSecurityProtectionDomainAccess() {
 149             if (javaSecurityProtectionDomainAccess == null)
 150                 unsafe.ensureClassInitialized(ProtectionDomain.class);
 151             return javaSecurityProtectionDomainAccess;
 152     }
 153 
 154     public static void setJavaSecurityAccess(JavaSecurityAccess jsa) {
 155         javaSecurityAccess = jsa;
 156     }
 157 
 158     public static JavaSecurityAccess getJavaSecurityAccess() {
 159         if (javaSecurityAccess == null) {
 160             unsafe.ensureClassInitialized(AccessController.class);
 161         }
 162         return javaSecurityAccess;
 163     }
 164 
 165     public static JavaUtilZipFileAccess getJavaUtilZipFileAccess() {
 166         if (javaUtilZipFileAccess == null)
 167             unsafe.ensureClassInitialized(java.util.zip.ZipFile.class);
 168         return javaUtilZipFileAccess;
 169     }
 170 
 171     public static void setJavaUtilZipFileAccess(JavaUtilZipFileAccess access) {
 172         javaUtilZipFileAccess = access;
 173     }
 174 
 175     public static void setJavaAWTAccess(JavaAWTAccess jaa) {
 176         javaAWTAccess = jaa;
 177     }
 178 
 179     public static JavaAWTAccess getJavaAWTAccess() {
 180         // this may return null in which case calling code needs to
 181         // provision for.
 182         if (javaAWTAccess == null) {
 183             return null;
 184         }
 185         return javaAWTAccess;
 186     }
 187 }
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