DxMultiIterator


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: DxMultiIterator.java,v 1.5 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: 1.5 $Date: 2000/10/28 16:55:14 $
16   */
17  public class DxMultiIterator extends DxAbstractIterator {
18      
19      final static long serialVersionUID = 1L;
20      
21      DxMultiMap multiMap;
22      DxIterator mapIt;
23      DxIterator contIt;
24      
25      
26      /**
27       */
28      public DxMultiIterator( DxMultiMap _multiMap ) {
29          multiMap = _multiMap;
30          reset();
31      }
32      
33      
34      /**
35       */
36      public Object   object() {
37          return contIt != null ? contIt.object() : null;
38      } 
39      
40      
41      /**
42       */
43      public Object   key() {
44          return mapIt != null ? mapIt.key() : null;
45      } 
46      
47      
48      /**
49       */
50      public Object   next() {
51          Object   obj = contIt != null ? contIt.next() : null;
52          if (obj == null) {
53              contIt = null;
54              if (mapIt != null && mapIt.next() != null) {
55                  contIt = ((DxCollection)mapIt.object()).iterator();
56                  obj = contIt.next();
57              } else {
58                  mapIt = null;
59              } 
60          } 
61          return obj;
62      } 
63      
64      
65      /**
66       */
67      public void reset() {
68          mapIt = multiMap.iterator();
69          if (mapIt.next() != null) {
70              contIt = ((DxCollection)mapIt.object()).iterator();
71          } else {
72              mapIt = null;
73          } 
74      } 
75      
76      
77      /**
78       */
79      public Object   removeObject() {
80          Object   obj = null;
81          if (contIt != null) {
82              obj = contIt.removeObject();
83              multiMap.multiItemCount--;
84              if (((DxCollection)mapIt.object()).isEmpty()) {
85                  contIt = null;
86                  mapIt.removeObject();
87              } 
88          } 
89          return obj;
90      } 
91  }
92
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