/* 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;
import com.db4o.ext.*;
import com.db4o.internal.delete.*;
import com.db4o.internal.handlers.*;
import com.db4o.internal.marshall.*;
import com.db4o.marshall.*;
/**
* @exclude
*/
public class VersionFieldMetadata extends VirtualFieldMetadata {
VersionFieldMetadata() {
super(Handlers4.LONG_ID, new LongHandler());
setName(VirtualField.VERSION);
}
public void addFieldIndex(ObjectIdContextImpl context) throws FieldIndexException{
StatefulBuffer buffer = (StatefulBuffer) context.buffer();
buffer.writeLong(context.transaction().container().generateTimeStampId());
}
public void delete(DeleteContextImpl context, boolean isUpdate){
context.seek(context.offset() + linkLength(context));
}
void instantiate1(ObjectReferenceContext context) {
context.objectReference().virtualAttributes().i_version = context.readLong();
}
void marshall(Transaction trans, ObjectReference ref, WriteBuffer buffer, boolean isMigrating, boolean isNew) {
VirtualAttributes attr = ref.virtualAttributes();
if (! isMigrating) {
attr.i_version = trans.container().generateTimeStampId();
}
if(attr == null){
buffer.writeLong(0);
}else{
buffer.writeLong(attr.i_version);
}
}
public int linkLength(HandlerVersionContext context) {
return Const4.LONG_LENGTH;
}
void marshallIgnore(WriteBuffer buffer) {
buffer.writeLong(0);
}
}