/* 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.handlers;
import java.io.*;
import com.db4o.*;
import com.db4o.ext.*;
import com.db4o.internal.*;
import com.db4o.internal.delete.*;
import com.db4o.internal.marshall.*;
import com.db4o.marshall.*;
/**
* @exclude
*/
public class StringHandler0 extends StringHandler {
public Object read(ReadContext context) {
ByteArrayBuffer buffer = (ByteArrayBuffer) ((InternalReadContext)context).readIndirectedBuffer();
if (buffer == null) {
return null;
}
return readString(context, buffer);
}
public void delete(DeleteContext context){
context.defragmentRecommended();
}
public void defragment(DefragmentContext context) {
int sourceAddress = context.sourceBuffer().readInt();
int length = context.sourceBuffer().readInt();
if(sourceAddress == 0 && length == 0) {
context.targetBuffer().writeInt(0);
context.targetBuffer().writeInt(0);
return;
}
int targetAddress = 0;
try {
targetAddress = context.copySlotToNewMapped(sourceAddress, length);
}
catch (IOException exc) {
throw new Db4oIOException(exc);
}
context.targetBuffer().writeInt(targetAddress);
context.targetBuffer().writeInt(length);
}
public Object readIndexEntryFromObjectSlot(MarshallerFamily mf, StatefulBuffer buffer) throws CorruptionException, Db4oIOException {
return buffer.container().readWriterByAddress(buffer.transaction(), buffer.readInt(), buffer.readInt());
}
public Object readIndexEntry(ObjectIdContext context) throws CorruptionException, Db4oIOException{
return context.transaction().container().readWriterByAddress(context.transaction(), context.readInt(), context.readInt());
}
}