/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 The eXist Team
*
* 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.btree.Value;
import org.exist.storage.journal.AbstractLoggable;
import org.exist.storage.journal.LogException;
import org.exist.storage.txn.Txn;
/**
* @author wolf
*
*/
public class WriteOverflowPageLoggable extends AbstractLoggable {
protected long pageNum;
protected long nextPage;
protected Value value;
private DOMFile domDb = null;
/**
*
*
* @param transaction
* @param pageNum
* @param nextPage
* @param value
*/
public WriteOverflowPageLoggable(Txn transaction, long pageNum, long nextPage, Value value) {
super(DOMFile.LOG_WRITE_OVERFLOW, transaction.getId());
this.pageNum = pageNum;
this.nextPage = nextPage;
this.value = value;
}
public WriteOverflowPageLoggable(DBBroker broker, long transactId) {
super(DOMFile.LOG_WRITE_OVERFLOW, 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) pageNum);
out.putInt((int) nextPage);
out.putShort((short) value.getLength());
out.put(value.data(), value.start(), value.getLength());
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#read(java.nio.ByteBuffer)
*/
public void read(ByteBuffer in) {
pageNum = in.getInt();
nextPage = in.getInt();
final int len = in.getShort();
final byte[] data = new byte[len];
in.get(data);
value = new Value(data);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#getLogSize()
*/
public int getLogSize() {
return 10 + value.getLength();
}
public void redo() throws LogException {
domDb.redoWriteOverflow(this);
}
public void undo() throws LogException {
domDb.undoWriteOverflow(this);
}
public String dump() {
return super.dump() + " - writing overflow page " + pageNum + "; next: " + nextPage;
}
}