/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.storage.index;
import java.nio.ByteBuffer;
import org.exist.storage.DBBroker;
import org.exist.storage.journal.LogException;
import org.exist.storage.txn.Txn;
import org.exist.util.ByteArray;
import org.exist.util.FixedByteArray;
/**
* @author wolf
*
*/
public class OverflowAppendLoggable extends AbstractBFileLoggable {
protected long pageNum;
protected ByteArray data;
protected int chunkSize;
protected int startOffset;
/**
*
*
* @param page
* @param chunk
* @param startOffset
* @param chunkSize
* @param fileId
* @param transaction
*/
public OverflowAppendLoggable(byte fileId, Txn transaction, long page,
ByteArray chunk, int startOffset, int chunkSize) {
super(BFile.LOG_OVERFLOW_APPEND, fileId, transaction);
this.pageNum = page;
this.data = chunk;
this.chunkSize = chunkSize;
this.startOffset = startOffset;
}
/**
* @param broker
* @param transactionId
*/
public OverflowAppendLoggable(DBBroker broker, long transactionId) {
super(broker, transactionId);
}
@Override
public void write(ByteBuffer out) {
super.write(out);
out.putInt((int) pageNum);
out.putInt(chunkSize);
data.copyTo(startOffset, out, chunkSize);
}
@Override
public void read(ByteBuffer in) {
super.read(in);
pageNum = in.getInt();
chunkSize = in.getInt();
final byte b[] = new byte[chunkSize];
in.get(b);
data = new FixedByteArray(b);
}
@Override
public int getLogSize() {
return super.getLogSize() + 8 + chunkSize;
}
@Override
public void redo() throws LogException {
getIndexFile().redoAppendOverflow(this);
}
@Override
public void undo() throws LogException {
getIndexFile().undoAppendOverflow(this);
}
@Override
public String dump() {
return super.dump() + " - append to overflow page " + pageNum;
}
}