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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      */
UnresolvedPermissionCollection()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 
add(Permission permission)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      */
getUnresolvedPermissions(Permission p)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      */
implies(Permission permission)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 
elements()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      */
writeObject(ObjectOutputStream out)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      */
readObject(ObjectInputStream in)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         @SuppressWarnings("unchecked")
201         // writeObject writes a Hashtable<String, Vector<UnresolvedPermission>>
202         // for the permissions key, so this cast is safe, unless the data is corrupt.
203         Hashtable<String, Vector<UnresolvedPermission>> permissions =
204                 (Hashtable<String, Vector<UnresolvedPermission>>)
205                 gfields.get("permissions", null);
206         perms = new HashMap<String, List<UnresolvedPermission>>(permissions.size()*2);
207 
208         // Convert each entry (Vector) into a List
209         Set<Map.Entry<String, Vector<UnresolvedPermission>>> set = permissions.entrySet();
210         for (Map.Entry<String, Vector<UnresolvedPermission>> e : set) {
211             // Convert Vector into ArrayList
212             Vector<UnresolvedPermission> vec = e.getValue();
213             List<UnresolvedPermission> list = new ArrayList<>(vec.size());
214             list.addAll(vec);
215 
216             // Add to Hashtable being serialized
217             perms.put(e.getKey(), list);
218         }
219     }
220 }
221