/*
* 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;
/**
* @author wolf
*
*/
public class RemoveValueLoggable extends AbstractBFileLoggable {
protected long page;
protected short tid;
protected byte[] oldData;
protected int offset = 0;
protected int len;
/**
*
*
* @param page
* @param tid
* @param oldData
* @param offset
* @param len
* @param fileId
* @param transaction
*/
public RemoveValueLoggable(Txn transaction, byte fileId, long page, short tid, byte[] oldData, int offset, int len) {
super(BFile.LOG_REMOVE_VALUE, fileId, transaction);
this.page = page;
this.tid = tid;
this.oldData = oldData;
this.offset = offset;
this.len = len;
}
/**
* @param broker
* @param transactionId
*/
public RemoveValueLoggable(DBBroker broker, long transactionId) {
super(broker, transactionId);
}
@Override
public void write(ByteBuffer out) {
super.write(out);
out.putInt((int) page);
out.putShort(tid);
out.putShort((short) len);
out.put(oldData, offset, len);
}
@Override
public void read(ByteBuffer in) {
super.read(in);
page = in.getInt();
tid = in.getShort();
len = in.getShort();
oldData = new byte[len];
in.get(oldData);
}
@Override
public int getLogSize() {
return super.getLogSize() + len + 8;
}
@Override
public void redo() throws LogException {
getIndexFile().redoRemoveValue(this);
}
@Override
public void undo() throws LogException {
getIndexFile().undoRemoveValue(this);
}
@Override
public String dump() {
return super.dump() + " - remove value with tid " + tid + " from page " + page;
}
}