DxAbstractSet


1   // You can redistribute this software and/or modify it under the terms of
2   // the Ozone Library License version 1 published by ozone-db.org.
3   //
4   // The original code and portions created by SMB are
5   // Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
6   //
7   // $Id: DxAbstractSet.java,v 1.6 2000/10/28 16:55:14 daniela Exp $
8   
9   package org.ozoneDB.DxLib;
10  
11  /**
12   * 
13   * 
14   * @author <a HREF="http://www.softwarebuero.de/">SMB</a>
15   * @version $Revision: 1.6 $Date: 2000/10/28 16:55:14 $
16   */
17  public abstract class DxAbstractSet extends DxAbstractCollection implements DxSet {
18      
19      final static long serialVersionUID = 1L;
20      
21      
22      /** */
23      public boolean equals( Object   obj ) {
24          if (obj instanceof DxSet && obj != null) {
25              DxSet rhs = (DxSet)obj;
26              
27              if (this == obj) {
28                  return true;
29              } 
30              
31              if (count() != rhs.count()) {
32                  return false;
33              } 
34              
35              return containsAll( rhs );
36          } else {
37              return false;
38          } 
39      } 
40      
41      
42      /**
43       */
44      public synchronized boolean retainAll( DxCollection coll ) {
45          boolean answer = false;
46          DxIterator it = iterator();
47          Object   obj;
48          while ((obj = it.next()) != null) {
49              if (!coll.contains( obj )) {
50                  it.removeObject();
51                  answer = true;
52              } 
53          } 
54          return answer;
55      } 
56      
57  }
58
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