IdentifiableMixin


1   package dynaop.example;
2   
3   import java.io.Serializable  ;
4   
5   import dynaop.Proxy;
6   import dynaop.ProxyAware;
7   
8   /**
9    * ID mixin implementation. Can also handle <code>equals()</code> and 
10   * <code>hashCode()</code>.
11   * 
12   * @author Bob Lee (crazybob@crazybob.org)
13   */
14  public class IdentifiableMixin implements Identifiable, ProxyAware, 
15          Serializable   {
16  
17      Object   proxy;
18      
19      private long id = -1;
20  
21      public long getId() {
22          return this.id;
23      }
24  
25      public void setId(long id) {
26          this.id = id;
27      }
28  
29      public boolean equals(Object   o) {
30          // make sure this is an Identifiable and is not null.
31          if (!(o instanceof Identifiable))
32              return false;
33          
34          // make sure they are of the same type.
35          if (!proxy.getClass().equals(o.getClass()))
36              return false;
37          
38          // make sure the IDs are the same.
39          return ((Identifiable) o).getId() == getId();
40      }
41  
42      public int hashCode() {
43          return this.proxy.getClass().hashCode() * 31 + (int) getId();
44      }
45      
46      public void setProxy(Proxy proxy) {
47          this.proxy = proxy;
48      }
49  }

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