/* ============================================================= * SmallSQL : a free Java DBMS library for the Java(tm) platform * ============================================================= * * (C) Copyright 2004-2007, by Volker Berlin. * * Project Info:  http://www.smallsql.de/ * * This library 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 2.1 of the License, or  * (at your option) any later version. * * This library 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 library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,  * USA.   * * [Java is a trademark or registered trademark of Sun Microsystems, Inc.  * in the United States and other countries.] * * --------------- * TableStorePage.java * --------------- * Author: Volker Berlin *  */package smallsql.database;import java.sql.*;public class TableStorePage extends StorePage{    final Table table;        // ======= variables needed for locking ========	int lockType;	SSConnection con;	TableStorePage nextLock;	TableStorePage(SSConnection con, Table table, int lockType, long fileOffset){		super( null, 0, table.raFile, fileOffset );		this.con 	= con;		this.table = table;		this.lockType 	= lockType;	}	           byte[] getData(){    	return page;    }    /**     * Returns the final position of the page back.     */    long commit() throws SQLException{		if(nextLock != null){			// save only the last version of this page			fileOffset = nextLock.commit();			nextLock = null;			rollback();			return fileOffset;		}    	if(lockType == TableView.LOCK_READ)    		return fileOffset;    	return super.commit();    }        final void freeLock(){    	table.freeLock(this);    }}