/* * 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 RemoveValueLoggable extends AbstractLoggable { private DOMFile domDb; protected long pageNum; protected short tid; protected int offset; protected byte[] oldData; protected boolean isOverflow; protected long backLink; /** * @param transaction * @param pageNum * @param tid * @param offset * @param oldData * @param isOverflow * @param backLink */ public RemoveValueLoggable(Txn transaction, long pageNum, short tid, int offset, byte[] oldData, boolean isOverflow, 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(DBBroker broker, long transactionId) { super(DOMFile.LOG_REMOVE_VALUE, transactionId); this.domDb = ((NativeBroker)broker).getDOMFile(); } /* (non-Javadoc) * @see org.exist.storage.log.Loggable#write(java.nio.ByteBuffer) */ public void write(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); } /* (non-Javadoc) * @see org.exist.storage.log.Loggable#read(java.nio.ByteBuffer) */ public void read(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(); } /* (non-Javadoc) * @see org.exist.storage.log.Loggable#getLogSize() */ public int getLogSize() { return 11 + oldData.length + (ItemId.isRelocated(tid) ? 8 : 0); } public void redo() throws LogException { domDb.redoRemoveValue(this); } public void undo() throws LogException { domDb.undoRemoveValue(this); } public String dump() { return super.dump() + " - removed value; tid = " + ItemId.getId(tid) + " from page " + pageNum + " at " + offset + "; len = " + oldData.length; } }