/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2015 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
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 RemoveValueLoggable extends AbstractLoggable {
private DOMFile domDb;
protected long pageNum;
protected short tid;
protected int offset;
protected byte[] oldData;
protected boolean isOverflow;
protected long backLink;
public RemoveValueLoggable(final Txn transaction, final long pageNum, final short tid, final int offset,
final byte[] oldData, final boolean isOverflow, final long backLink) {
super(DOMFile.LOG_REMOVE_VALUE, transaction.getId());
this.pageNum = pageNum;
this.tid = tid;
this.offset = offset;
this.oldData = oldData;
this.isOverflow = isOverflow;
this.backLink = backLink;
}
public RemoveValueLoggable(final DBBroker broker, final long transactionId) {
super(DOMFile.LOG_REMOVE_VALUE, transactionId);
this.domDb = ((NativeBroker) broker).getDOMFile();
}
@Override
public void write(final ByteBuffer out) {
out.put((byte) (isOverflow ? 1 : 0));
out.putInt((int) pageNum);
out.putShort(tid);
out.putShort((short) offset);
out.putShort((short) oldData.length);
out.put(oldData);
if (ItemId.isRelocated(tid)) {
out.putLong(backLink);
}
}
@Override
public void read(final ByteBuffer in) {
isOverflow = in.get() == 1;
pageNum = in.getInt();
tid = in.getShort();
offset = in.getShort();
oldData = new byte[in.getShort()];
in.get(oldData);
if (ItemId.isRelocated(tid)) {
backLink = in.getLong();
}
}
@Override
public int getLogSize() {
return 11 + oldData.length + (ItemId.isRelocated(tid) ? 8 : 0);
}
@Override
public void redo() throws LogException {
domDb.redoRemoveValue(this);
}
@Override
public void undo() throws LogException {
domDb.undoRemoveValue(this);
}
@Override
public String dump() {
return super.dump() + " - removed value; tid = " + ItemId.getId(tid) + " from page " + pageNum + " at " + offset +
"; len = " + oldData.length;
}
}