/*
* 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;
/**
* Insert a value into a data page.
*
* @author wolf
*/
public class InsertValueLoggable extends AbstractLoggable {
protected DOMFile domDb;
protected byte isOverflow;
protected long pageNum;
protected short tid;
protected byte[] value;
protected int offset;
/**
* @param transaction
* @param pageNum
* @param isOverflow
* @param tid
* @param value
* @param offset
*/
public InsertValueLoggable(Txn transaction, long pageNum, boolean isOverflow, short tid, byte[] value, int offset) {
super(DOMFile.LOG_INSERT_RECORD, transaction.getId());
this.pageNum = pageNum;
this.isOverflow = (isOverflow ? (byte)1 : 0);
this.tid = tid;
this.value = value;
this.offset = offset;
}
public InsertValueLoggable(DBBroker broker, long transactionId) {
super(DOMFile.LOG_INSERT_RECORD, transactionId);
this.domDb = ((NativeBroker)broker).getDOMFile();
}
protected boolean isOverflow() {
return isOverflow == 1;
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#write(java.nio.ByteBuffer)
*/
public void write(ByteBuffer out) {
out.putInt((int)pageNum);
out.put(isOverflow);
out.putInt(offset);
out.putShort(tid);
out.putShort((short)value.length);
out.put(value);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#read(java.nio.ByteBuffer)
*/
public void read(ByteBuffer in) {
pageNum = in.getInt();
isOverflow = in.get();
offset = in.getInt();
tid = in.getShort();
value = new byte[in.getShort()];
in.get(value);
}
/* (non-Javadoc)
* @see org.exist.storage.log.Loggable#getLogSize()
*/
public int getLogSize() {
return 13 + value.length;
}
public void redo() throws LogException {
domDb.redoInsertValue(this);
}
public void undo() throws LogException {
domDb.undoInsertValue(this);
}
public String dump() {
return super.dump() + " - inserted value; tid = " + tid + " in page " + pageNum +
"; bytes: " + value.length + "; offset: " + offset;
}
}