View Javadoc

1   /*
2    * Copyright 2001-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.neethi;
17  
18  import java.util.HashMap;
19  
20  /**
21   * Provides a default implementation of PolicyRegistry interface.
22   */
23  public class PolicyRegistryImpl implements PolicyRegistry {
24      
25      private PolicyRegistry parent = null;
26      
27      private HashMap reg = new HashMap();
28      
29      public PolicyRegistryImpl() {
30      }
31      
32      /**
33       * Constructs a PolicyRegistryImpl with the specified PolicyRegistry
34       * as it's parent. If it can't lookup a Policy in it's own registry
35       * then it lookup in the parent and returns the results.  
36       * 
37       * @param parent the Parent of this PolicyRegistry
38       */
39      public PolicyRegistryImpl(PolicyRegistry parent) {
40          this.parent = parent;
41      }
42      
43      public Policy lookup(String key) {
44          Policy policy = (Policy) reg.get(key);
45          
46          if (policy == null && parent != null) {
47              return parent.lookup(key);
48          }
49          
50          return policy;
51      }
52  
53      public void register(String key, Policy policy) {
54          reg.put(key, policy);
55      }
56      
57      public void remove(String key) {
58          reg.remove(key);
59      }
60      
61      public void setParent(PolicyRegistry parent) {
62          this.parent = parent;
63      }
64      
65      public PolicyRegistry getParent() {
66          return parent;
67      }
68  }