/*
* 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.btree;
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 BTAbstractLoggable {
protected long pageNum;
protected int idx;
protected Value oldValue;
protected long oldPointer;
/**
* @param fileId
* @param pageNum
* @param idx
* @param oldValue
* @param oldPointer
* @param transaction
*/
public RemoveValueLoggable(Txn transaction, byte fileId, long pageNum, int idx, Value oldValue, long oldPointer) {
super(BTree.LOG_REMOVE_VALUE, fileId, transaction);
this.pageNum = pageNum;
this.idx = idx;
this.oldValue = oldValue;
this.oldPointer = oldPointer;
}
/**
* @param broker
* @param transactionId
*/
public RemoveValueLoggable(DBBroker broker, long transactionId) {
super(BTree.LOG_REMOVE_VALUE, broker, transactionId);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#write(java.nio.ByteBuffer)
*/
public void write(ByteBuffer out) {
super.write(out);
out.putInt((int) pageNum);
out.putShort((short) idx);
out.putShort((short) oldValue.getLength());
out.put(oldValue.data(), oldValue.start(), oldValue.getLength());
out.putLong(oldPointer);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#read(java.nio.ByteBuffer)
*/
public void read(ByteBuffer in) {
super.read(in);
pageNum = in.getInt();
idx = in.getShort();
int l = in.getShort();
byte[] data = new byte[l];
in.get(data);
oldValue = new Value(data);
oldPointer = in.getLong();
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#getLogSize()
*/
public int getLogSize() {
return super.getLogSize() + 16 + oldValue.getLength();
}
public void redo() throws LogException {
getStorage().redoRemoveValue(this);
}
public void undo() throws LogException {
getStorage().undoRemoveValue(this);
}
public String dump() {
return super.dump() + " - removed btree key on page: " + pageNum;
}
}