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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.client;
29  
30  import org.apache.http.protocol.HttpContext;
31  
32  /**
33   * A handler for determining if the given execution context is user specific
34   * or not. The token object returned by this handler is expected to uniquely
35   * identify the current user if the context is user specific or to be
36   * <code>null</code> if the context does not contain any resources or details
37   * specific to the current user.
38   * <p/>
39   * The user token will be used to ensure that user specific resources will not
40   * be shared with or reused by other users.
41   *
42   * @since 4.0
43   */
44  public interface UserTokenHandler {
45  
46      /**
47       * The token object returned by this method is expected to uniquely
48       * identify the current user if the context is user specific or to be
49       * <code>null</code> if it is not.
50       *
51       * @param context the execution context
52       *
53       * @return user token that uniquely identifies the user or
54       * <code>null</null> if the context is not user specific.
55       */
56      Object getUserToken(HttpContext context);
57  
58  }