MergeView


1   // $Id: MergeView.java,v 1.2 2004/09/15 17:41:03 belaban Exp $
2   
3   
4   package org.jgroups;
5   
6   import java.io.IOException  ;
7   import java.io.ObjectInput  ;
8   import java.io.ObjectOutput  ;
9   import java.util.Vector  ;
10  
11  
12  /**
13   * A view that is sent as result of a merge.
14   */
15  public class MergeView extends View {
16      protected Vector   subgroups=null; // subgroups that merged into this single view (a list of Views)
17  
18  
19      /**
20       * Used by externalization
21       */
22      public MergeView() {
23      }
24  
25  
26      /**
27       * Creates a new view
28       *
29       * @param vid       The view id of this view (can not be null)
30       * @param members   Contains a list of all the members in the view, can be empty but not null.
31       * @param subgroups A list of Views representing the former subgroups
32       */
33      public MergeView(ViewId vid, Vector   members, Vector   subgroups) {
34          super(vid, members);
35          this.subgroups=subgroups;
36      }
37  
38  
39      /**
40       * Creates a new view
41       *
42       * @param creator   The creator of this view (can not be null)
43       * @param id        The lamport timestamp of this view
44       * @param members   Contains a list of all the members in the view, can be empty but not null.
45       * @param subgroups A list of Views representing the former subgroups
46       */
47      public MergeView(Address creator, long id, Vector   members, Vector   subgroups) {
48          super(creator, id, members);
49          this.subgroups=subgroups;
50      }
51  
52  
53      public Vector   getSubgroups() {
54          return subgroups;
55      }
56  
57  
58      /**
59       * creates a copy of this view
60       *
61       * @return a copy of this view
62       */
63      public Object   clone() {
64          ViewId vid2=vid != null ? (ViewId)vid.clone() : null;
65          Vector   members2=members != null ? (Vector  )members.clone() : null;
66          Vector   subgroups2=subgroups != null ? (Vector  )subgroups.clone() : null;
67          return new MergeView(vid2, members2, subgroups2);
68      }
69  
70  
71      public String   toString() {
72          StringBuffer   sb=new StringBuffer  ();
73          sb.append("MergeView::" + super.toString());
74          sb.append(", subgroups=" + subgroups);
75          return sb.toString();
76      }
77  
78  
79      public void writeExternal(ObjectOutput   out) throws IOException   {
80          super.writeExternal(out);
81          out.writeObject(subgroups);
82      }
83  
84  
85      public void readExternal(ObjectInput   in) throws IOException  , ClassNotFoundException   {
86          super.readExternal(in);
87          subgroups=(Vector  )in.readObject();
88      }
89  
90  
91  }
92
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