1 /*

     2  * Copyright (c) 2014, 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.security.jgss;

    27 

    28 import org.ietf.jgss.GSSContext;

    29 import org.ietf.jgss.GSSCredential;

    30 

    31 /**

    32  * The extending point of basic JGSS-API.

    33  * <p>

    34  * If a module wants to extend basic JGSS-API classes, it should extends this

    35  * class and register itself as "the extender" using the setExtender method.

    36  * When various GSSManager.createXXX methods are called, they will call

    37  * "the extender"'s wrap methods to create objects of extended types

    38  * instead of basic types.

    39  * <p>

    40  * We have only one extension now defined in com.sun.security.jgss, and the

    41  * registering process is triggered in {@link GSSManagerImpl} by calling

    42  * Class.forName("com.sun.security.jgss.Extender"). Only GSSContext

    43  * and GSSCredential are extended now.

    44  * <p>

    45  * The setExtender method should be called before any JGSS call.

    46  */

    47 public class JgssExtender {

    48 

    49     // "The extender"

    50     private static volatile JgssExtender theOne = new JgssExtender();

    51 

    52     /**

    53      * Gets "the extender". GSSManager calls this method so that it can

    54      * wrap basic objects into extended objects.

    55      * @return the extender

    56      */

    57     public static JgssExtender getExtender() {

    58         return theOne;

    59     }

    60 

    61     /**

    62      * Set "the extender" so that GSSManager can create extended objects.

    63      */

    64     protected static void setExtender(JgssExtender theOne) {

    65         JgssExtender.theOne = theOne;

    66     }

    67 

    68     /**

    69      * Wraps a plain GSSCredential object into an extended type.

    70      */

    71     public GSSCredential wrap(GSSCredential cred) {

    72         return cred;

    73     }

    74 

    75     /**

    76      * Wraps a plain GSSContext object into an extended type.

    77      */

    78     public GSSContext wrap(GSSContext ctxt) {

    79         return ctxt;

    80     }

    81 }