AbstractContextIDMapping


1   /* Copyright (C) 2004 - 2006  db4objects Inc.  http://www.db4o.com
2   
3   This file is part of the db4o open source object database.
4   
5   db4o is free software; you can redistribute it and/or modify it under
6   the terms of version 2 of the GNU General Public License as published
7   by the Free Software Foundation and as clarified by db4objects' GPL 
8   interpretation policy, available at
9   http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10  Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11  Suite 350, San Mateo, CA 94403, USA.
12  
13  db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14  WARRANTY; without even the implied warranty of MERCHANTABILITY or
15  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16  for more details.
17  
18  You should have received a copy of the GNU General Public License along
19  with this program; if not, write to the Free Software Foundation, Inc.,
20  59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
21  package com.db4o.defragment;
22  
23  import com.db4o.foundation.*;
24  
25  
26  /**
27   * Base class for defragment ID mappings.
28   * 
29   * @see Defragment
30   */
31  abstract class AbstractContextIDMapping implements ContextIDMapping {
32  
33      private Hashtable4  _classIDs = new Hashtable4();
34  
35      public final void mapIDs(int origID, int mappedID, boolean isClassID) {
36          if(isClassID) {
37              mapClassIDs(origID, mappedID);
38              return;
39          }
40          mapNonClassIDs(origID, mappedID);
41      }
42  
43      protected int mappedClassID(int origID) {
44          Object   obj = _classIDs.get(origID);
45          if(obj == null){
46              return 0;
47          }
48          return ((Integer  )obj).intValue();
49      }
50  
51      private void mapClassIDs(int oldID, int newID) {
52          _classIDs.put(oldID,new Integer  (newID));
53      }
54  
55      protected abstract void mapNonClassIDs(int origID,int mappedID);
56  }
57
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