/* Copyright (C) 2004 - 2008  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
package com.db4o.defragment;

import com.db4o.foundation.*;


/**
 * Base class for defragment ID mappings.
 * 
 * @see Defragment
 */
public abstract class AbstractContextIDMapping implements ContextIDMapping {

	private Hashtable4	_classIDs = new Hashtable4();

	public final void mapIDs(int origID, int mappedID, boolean isClassID) {
		if(isClassID) {
			mapClassIDs(origID, mappedID);
			return;
		}
		mapNonClassIDs(origID, mappedID);
	}

	protected int mappedClassID(int origID) {
		Object obj = _classIDs.get(origID);
		if(obj == null){
			return 0;
		}
		return ((Integer)obj).intValue();
	}

	private void mapClassIDs(int oldID, int newID) {
		_classIDs.put(oldID,new Integer(newID));
	}

	protected abstract void mapNonClassIDs(int origID,int mappedID);
}
