/*
* 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 RemovePageLoggable extends AbstractLoggable {
private DOMFile domDb;
protected long pageNum;
protected long prevPage;
protected long nextPage;
protected byte[] oldData;
protected int oldLen;
protected short oldTid;
protected short oldRecCnt;
/**
* @param transaction
* @param pageNum
* @param prevPage
* @param nextPage
* @param oldData
* @param oldLen
* @param oldTid
* @param oldRecCnt
*/
public RemovePageLoggable(Txn transaction, long pageNum, long prevPage, long nextPage,
byte[] oldData, int oldLen, short oldTid, short oldRecCnt) {
super(DOMFile.LOG_REMOVE_PAGE, transaction.getId());
this.pageNum = pageNum;
this.prevPage = prevPage;
this.nextPage = nextPage;
this.oldData = oldData;
this.oldLen = oldLen;
this.oldTid = oldTid;
this.oldRecCnt = oldRecCnt;
}
public RemovePageLoggable(DBBroker broker, long transactionId) {
super(DOMFile.LOG_REMOVE_PAGE, transactionId);
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) pageNum);
out.putInt((int) prevPage);
out.putInt((int) nextPage);
out.putShort(oldTid);
out.putShort(oldRecCnt);
out.putShort((short) oldLen);
out.put(oldData, 0, oldLen);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#read(java.nio.ByteBuffer)
*/
public void read(ByteBuffer in) {
pageNum = in.getInt();
prevPage = in.getInt();
nextPage = in.getInt();
oldTid = in.getShort();
oldRecCnt = in.getShort();
oldLen = in.getShort();
oldData = new byte[domDb.getFileHeader().getWorkSize()];
in.get(oldData, 0, oldLen);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#getLogSize()
*/
public int getLogSize() {
return 18 + oldLen;
}
public void redo() throws LogException {
domDb.redoRemovePage(this);
}
public void undo() throws LogException {
domDb.undoRemovePage(this);
}
public String dump() {
return super.dump() + " - removed page " + pageNum;
}
}