/*
* 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.dom;
import java.nio.ByteBuffer;
import org.exist.storage.DBBroker;
import org.exist.storage.NativeBroker;
import org.exist.storage.journal.AbstractLoggable;
import org.exist.storage.journal.LogException;
import org.exist.storage.txn.Txn;
/**
* @author wolf
*
*/
public class UpdateHeaderLoggable extends AbstractLoggable {
protected long pageNum;
protected long nextPage;
protected long prevPage;
protected long oldNext;
protected long oldPrev;
private DOMFile domDb = null;
/**
*
*
* @param transaction
* @param prevPage
* @param pageNum
* @param nextPage
* @param oldPrev
* @param oldNext
*/
public UpdateHeaderLoggable(Txn transaction, long prevPage, long pageNum, long nextPage,
long oldPrev, long oldNext) {
super(DOMFile.LOG_UPDATE_HEADER, transaction.getId());
this.prevPage = prevPage;
this.pageNum = pageNum;
this.nextPage = nextPage;
this.oldPrev = oldPrev;
this.oldNext = oldNext;
}
public UpdateHeaderLoggable(DBBroker broker, long transactId) {
super(DOMFile.LOG_UPDATE_HEADER, transactId);
this.domDb = ((NativeBroker)broker).getDOMFile();
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#write(java.nio.ByteBuffer)
*/
public void write(ByteBuffer out) {
out.putInt((int) prevPage);
out.putInt((int) pageNum);
out.putInt((int) nextPage);
out.putInt((int) oldPrev);
out.putInt((int) oldNext);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#read(java.nio.ByteBuffer)
*/
public void read(ByteBuffer in) {
prevPage = in.getInt();
pageNum = in.getInt();
nextPage = in.getInt();
oldPrev = in.getInt();
oldNext = in.getInt();
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#getLogSize()
*/
public int getLogSize() {
return 20;
}
public void redo() throws LogException {
domDb.redoUpdateHeader(this);
}
public void undo() throws LogException {
domDb.undoUpdateHeader(this);
}
public String dump() {
return super.dump() + " - update header of page " + pageNum + ": prev = " + prevPage +
"; next = " + nextPage + "; oldPrev = " + oldPrev + "; oldNext = " + oldNext;
}
}