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PolicyContext xref
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1   package org.apache.archiva.redback.policy;
2   
3   /*
4    * Copyright 2001-2006 The Apache Software Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  import java.util.HashMap;
20  import java.util.Map;
21  
22  /**
23   * PolicyContext - A Thread Local Context.
24   * Useful for managing policy operations on a thread local point of view. 
25   *
26   * @author <a href="mailto:joakim@erdfelt.com">Joakim Erdfelt</a>
27   *
28   */
29  public class PolicyContext
30  {
31      static ThreadLocal<PolicyContext> policyContext = new PolicyContextThreadLocal();
32  
33      Map<Object, Object> context;
34  
35      public PolicyContext( Map<Object, Object> map )
36      {
37          context = map;
38      }
39  
40      public static void setContext( PolicyContext context )
41      {
42          policyContext.set( context );
43      }
44  
45      public static PolicyContext getContext()
46      {
47          PolicyContext ctx = (PolicyContext) policyContext.get();
48          if ( ctx == null )
49          {
50              ctx = new PolicyContext( new HashMap<Object, Object>() );
51              setContext( ctx );
52          }
53  
54          return ctx;
55      }
56  
57      public Object get( Object key )
58      {
59          return context.get( key );
60      }
61  
62      public void put( Object key, Object value )
63      {
64          context.put( key, value );
65      }
66  
67      private static class PolicyContextThreadLocal
68          extends ThreadLocal<PolicyContext>
69      {
70          protected PolicyContext initialValue()
71          {
72              return new PolicyContext( new HashMap<Object, Object>() );
73          }
74      }
75  }