Source Code Cross Referenced for GuardedObject.java in  » 6.0-JDK-Modules » j2me » java » security » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.security 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * @(#)GuardedObject.java	1.17 06/10/10
03:         *
04:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
05:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
06:         *   
07:         * This program is free software; you can redistribute it and/or  
08:         * modify it under the terms of the GNU General Public License version  
09:         * 2 only, as published by the Free Software Foundation.   
10:         *   
11:         * This program is distributed in the hope that it will be useful, but  
12:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
13:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
14:         * General Public License version 2 for more details (a copy is  
15:         * included at /legal/license.txt).   
16:         *   
17:         * You should have received a copy of the GNU General Public License  
18:         * version 2 along with this work; if not, write to the Free Software  
19:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
20:         * 02110-1301 USA   
21:         *   
22:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
23:         * Clara, CA 95054 or visit www.sun.com if you need additional  
24:         * information or have any questions. 
25:         *
26:         */
27:
28:        package java.security;
29:
30:        /**
31:         * A GuardedObject is an object that is used to protect access to
32:         * another object.
33:         *
34:         * <p>A GuardedObject encapsulates a target object and a Guard object,
35:         * such that access to the target object is possible
36:         * only if the Guard object allows it.
37:         * Once an object is encapsulated by a GuardedObject,
38:         * access to that object is controlled by the <code>getObject</code>
39:         * method, which invokes the
40:         * <code>checkGuard</code> method on the Guard object that is
41:         * guarding access. If access is not allowed,
42:         * an exception is thrown.
43:         *
44:         * @see Guard
45:         * @see Permission
46:         *
47:         * @version 1.11 00/02/02
48:         * @author Roland Schemers
49:         * @author Li Gong
50:         */
51:
52:        public class GuardedObject implements  java.io.Serializable {
53:
54:            private Object object; // the object we are guarding
55:            private Guard guard; // the guard
56:
57:            /**
58:             * Constructs a GuardedObject using the specified object and guard.
59:             * If the Guard object is null, then no restrictions will
60:             * be placed on who can access the object.
61:             *
62:             * @param object the object to be guarded.
63:             *
64:             * @param guard the Guard object that guards access to the object.
65:             */
66:
67:            public GuardedObject(Object object, Guard guard) {
68:                this .guard = guard;
69:                this .object = object;
70:            }
71:
72:            /**
73:             * Retrieves the guarded object, or throws an exception if access
74:             * to the guarded object is denied by the guard.
75:             *
76:             * @return the guarded object.
77:             *
78:             * @exception SecurityException if access to the guarded object is
79:             * denied.
80:             */
81:            public Object getObject() throws SecurityException {
82:                if (guard != null)
83:                    guard.checkGuard(object);
84:
85:                return object;
86:            }
87:
88:            /**
89:             * Writes this object out to a stream (i.e., serializes it).
90:             * We check the guard if there is one.
91:             */
92:            private synchronized void writeObject(java.io.ObjectOutputStream oos)
93:                    throws java.io.IOException {
94:                if (guard != null)
95:                    guard.checkGuard(object);
96:
97:                oos.defaultWriteObject();
98:            }
99:        }
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