/*
* 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 UpdateValueLoggable extends AbstractLoggable {
protected DOMFile domDb;
protected long pageNum;
protected short tid;
protected byte[] value;
protected byte[] oldValue;
protected int oldOffset;
public UpdateValueLoggable(Txn transaction, long pageNum, short tid,
byte[] value, byte[] oldValue, int oldOffset) {
super(DOMFile.LOG_UPDATE_VALUE, transaction.getId());
this.pageNum = pageNum;
this.tid = tid;
this.value = value;
this.oldValue = oldValue;
this.oldOffset = oldOffset;
}
public UpdateValueLoggable(DBBroker broker, long transactionId) {
super(DOMFile.LOG_UPDATE_VALUE, transactionId);
this.domDb = ((NativeBroker)broker).getDOMFile();
}
public void write(ByteBuffer out) {
out.putInt((int)pageNum);
out.putShort(tid);
out.putShort((short)value.length);
out.put(value);
out.putShort((short) oldOffset);
out.put(oldValue, oldOffset, value.length);
}
public void read(ByteBuffer in) {
pageNum = in.getInt();
tid = in.getShort();
value = new byte[in.getShort()];
in.get(value);
oldOffset = in.getShort();
oldValue = new byte[value.length];
in.get(oldValue);
}
public int getLogSize() {
return 10 + (value.length * 2);
}
public void redo() throws LogException {
domDb.redoUpdateValue(this);
}
public void undo() throws LogException {
domDb.undoUpdateValue(this);
}
public String dump() {
return super.dump() + " - updated value; tid = " + ItemId.getId(tid) + " to page " + pageNum;
}
}