ObjectIdDictionary


1   package com.thoughtworks.xstream.core.util;
2   
3   import java.util.HashMap  ;
4   import java.util.Map  ;
5   
6   /**
7    * Store IDs against given object references.
8    * <p/>
9    * Behaves the same way as java.util.IdentityHashMap, but in JDK1.3 as well.
10   */
11  public class ObjectIdDictionary {
12  
13      private Map   map = new HashMap  ();
14  
15      public void associateId(Object   obj, String   id) {
16          map.put(id(obj), id);
17      }
18  
19      public String   lookupId(Object   obj) {
20          return (String  ) map.get(id(obj));
21      }
22  
23      private Object   id(Object   obj) {
24          return new Integer  (System.identityHashCode(obj));
25      }
26  
27  }
28

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