/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
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, see http://www.gnu.org/licenses/. */
package com.db4o.internal.mapping;
import com.db4o.foundation.*;
import com.db4o.internal.*;
import com.db4o.internal.handlers.*;
import com.db4o.marshall.*;
/**
* @exclude
*/
public class MappedIDPairHandler implements Indexable4 {
private final IntHandler _origHandler;
private final IntHandler _mappedHandler;
public MappedIDPairHandler() {
_origHandler=new IntHandler();
_mappedHandler=new IntHandler();
}
public void defragIndexEntry(DefragmentContextImpl context) {
throw new NotImplementedException();
}
public int linkLength() {
return _origHandler.linkLength()+_mappedHandler.linkLength();
}
public Object readIndexEntry(Context context, ByteArrayBuffer reader) {
int origID=readID(context, reader);
int mappedID=readID(context, reader);
return new MappedIDPair(origID,mappedID);
}
public void writeIndexEntry(Context context, ByteArrayBuffer reader, Object obj) {
MappedIDPair mappedIDs=(MappedIDPair)obj;
_origHandler.writeIndexEntry(context, reader, new Integer(mappedIDs.orig()));
_mappedHandler.writeIndexEntry(context, reader, new Integer(mappedIDs.mapped()));
}
private int readID(Context context, ByteArrayBuffer a_reader) {
return ((Integer)_origHandler.readIndexEntry(context, a_reader)).intValue();
}
public PreparedComparison prepareComparison(Context context, Object source) {
MappedIDPair sourceIDPair = (MappedIDPair)source;
final int sourceID = sourceIDPair.orig();
return new PreparedComparison() {
public int compareTo(Object target) {
MappedIDPair targetIDPair = (MappedIDPair)target;
int targetID = targetIDPair.orig();
return sourceID == targetID ? 0 : (sourceID < targetID ? - 1 : 1);
}
};
}
}