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    1   /*
    2    * Copyright (c) 1997, 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   package java.security;
   27   
   28   import java.util;
   29   import java.io.ObjectStreamField;
   30   import java.io.ObjectOutputStream;
   31   import java.io.ObjectInputStream;
   32   import java.io.IOException;
   33   
   34   /**
   35    * A UnresolvedPermissionCollection stores a collection
   36    * of UnresolvedPermission permissions.
   37    *
   38    * @see java.security.Permission
   39    * @see java.security.Permissions
   40    * @see java.security.UnresolvedPermission
   41    *
   42    *
   43    * @author Roland Schemers
   44    *
   45    * @serial include
   46    */
   47   
   48   final class UnresolvedPermissionCollection
   49   extends PermissionCollection
   50   implements java.io.Serializable
   51   {
   52       /**
   53        * Key is permission type, value is a list of the UnresolvedPermissions
   54        * of the same type.
   55        * Not serialized; see serialization section at end of class.
   56        */
   57       private transient Map<String, List<UnresolvedPermission>> perms;
   58   
   59       /**
   60        * Create an empty UnresolvedPermissionCollection object.
   61        *
   62        */
   63       public UnresolvedPermissionCollection() {
   64           perms = new HashMap<String, List<UnresolvedPermission>>(11);
   65       }
   66   
   67       /**
   68        * Adds a permission to this UnresolvedPermissionCollection.
   69        * The key for the hash is the unresolved permission's type (class) name.
   70        *
   71        * @param permission the Permission object to add.
   72        */
   73   
   74       public void add(Permission permission)
   75       {
   76           if (! (permission instanceof UnresolvedPermission))
   77               throw new IllegalArgumentException("invalid permission: "+
   78                                                  permission);
   79           UnresolvedPermission up = (UnresolvedPermission) permission;
   80   
   81           List<UnresolvedPermission> v;
   82           synchronized (this) {
   83               v = perms.get(up.getName());
   84               if (v == null) {
   85                   v = new ArrayList<UnresolvedPermission>();
   86                   perms.put(up.getName(), v);
   87               }
   88           }
   89           synchronized (v) {
   90               v.add(up);
   91           }
   92       }
   93   
   94       /**
   95        * get any unresolved permissions of the same type as p,
   96        * and return the List containing them.
   97        */
   98       List<UnresolvedPermission> getUnresolvedPermissions(Permission p) {
   99           synchronized (this) {
  100               return perms.get(p.getClass().getName());
  101           }
  102       }
  103   
  104       /**
  105        * always returns false for unresolved permissions
  106        *
  107        */
  108       public boolean implies(Permission permission)
  109       {
  110           return false;
  111       }
  112   
  113       /**
  114        * Returns an enumeration of all the UnresolvedPermission lists in the
  115        * container.
  116        *
  117        * @return an enumeration of all the UnresolvedPermission objects.
  118        */
  119   
  120       public Enumeration<Permission> elements() {
  121           List<Permission> results =
  122               new ArrayList<>(); // where results are stored
  123   
  124           // Get iterator of Map values (which are lists of permissions)
  125           synchronized (this) {
  126               for (List<UnresolvedPermission> l : perms.values()) {
  127                   synchronized (l) {
  128                       results.addAll(l);
  129                   }
  130               }
  131           }
  132   
  133           return Collections.enumeration(results);
  134       }
  135   
  136       private static final long serialVersionUID = -7176153071733132400L;
  137   
  138       // Need to maintain serialization interoperability with earlier releases,
  139       // which had the serializable field:
  140       // private Hashtable permissions; // keyed on type
  141   
  142       /**
  143        * @serialField permissions java.util.Hashtable
  144        *     A table of the UnresolvedPermissions keyed on type, value is Vector
  145        *     of permissions
  146        */
  147       private static final ObjectStreamField[] serialPersistentFields = {
  148           new ObjectStreamField("permissions", Hashtable.class),
  149       };
  150   
  151       /**
  152        * @serialData Default field.
  153        */
  154       /*
  155        * Writes the contents of the perms field out as a Hashtable
  156        * in which the values are Vectors for
  157        * serialization compatibility with earlier releases.
  158        */
  159       private void writeObject(ObjectOutputStream out) throws IOException {
  160           // Don't call out.defaultWriteObject()
  161   
  162           // Copy perms into a Hashtable
  163           Hashtable<String, Vector<UnresolvedPermission>> permissions =
  164               new Hashtable<>(perms.size()*2);
  165   
  166           // Convert each entry (List) into a Vector
  167           synchronized (this) {
  168               Set<Map.Entry<String, List<UnresolvedPermission>>> set = perms.entrySet();
  169               for (Map.Entry<String, List<UnresolvedPermission>> e : set) {
  170                   // Convert list into Vector
  171                   List<UnresolvedPermission> list = e.getValue();
  172                   Vector<UnresolvedPermission> vec = new Vector<>(list.size());
  173                   synchronized (list) {
  174                       vec.addAll(list);
  175                   }
  176   
  177                   // Add to Hashtable being serialized
  178                   permissions.put(e.getKey(), vec);
  179               }
  180           }
  181   
  182           // Write out serializable fields
  183           ObjectOutputStream.PutField pfields = out.putFields();
  184           pfields.put("permissions", permissions);
  185           out.writeFields();
  186       }
  187   
  188       /*
  189        * Reads in a Hashtable in which the values are Vectors of
  190        * UnresolvedPermissions and saves them in the perms field.
  191        */
  192       private void readObject(ObjectInputStream in) throws IOException,
  193       ClassNotFoundException {
  194           // Don't call defaultReadObject()
  195   
  196           // Read in serialized fields
  197           ObjectInputStream.GetField gfields = in.readFields();
  198   
  199           // Get permissions
  200           Hashtable<String, Vector<UnresolvedPermission>> permissions =
  201                   (Hashtable<String, Vector<UnresolvedPermission>>)gfields.get("permissions", null);
  202           perms = new HashMap<String, List<UnresolvedPermission>>(permissions.size()*2);
  203   
  204           // Convert each entry (Vector) into a List
  205           Set<Map.Entry<String, Vector<UnresolvedPermission>>> set = permissions.entrySet();
  206           for (Map.Entry<String, Vector<UnresolvedPermission>> e : set) {
  207               // Convert Vector into ArrayList
  208               Vector<UnresolvedPermission> vec = e.getValue();
  209               List<UnresolvedPermission> list = new ArrayList<>(vec.size());
  210               list.addAll(vec);
  211   
  212               // Add to Hashtable being serialized
  213               perms.put(e.getKey(), list);
  214           }
  215       }
  216   }

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