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dbUnit is a JUnit extension (also usable from Ant and Maven) targeted for database-driven projects that, among other things, puts your database into a known state between test runs. This is an excellent way to avoid the myriad of problems that can occur when one test case corrupts the database and causes subsequent tests to fail or exacerbate the damage.

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/*
 *
 * The DbUnit Database Testing Framework
 * Copyright (C)2002-2004, DbUnit.org
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
package org.dbunit.dataset;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Decorator that returns the {@link ITable}s of the decorated dataset 
 * as {@link SortedTable}s.
 * 
 * @author Manuel Laflamme
 * @version $Revision$
 * @since Feb 19, 2003
 */
public class SortedDataSet extends AbstractDataSet
{

    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(SortedDataSet.class);

    private final IDataSet _dataSet;

    public SortedDataSet(IDataSet dataSet) throws DataSetException
    {
        _dataSet = dataSet;
    }

    ////////////////////////////////////////////////////////////////////////////
    // AbstractDataSet class

    protected ITableIterator createIterator(boolean reversed)
            throws DataSetException
    {
        if(logger.isDebugEnabled())
            logger.debug("createIterator(reversed={}) - start", String.valueOf(reversed));

        return new SortedIterator(reversed ?
                _dataSet.reverseIterator() : _dataSet.iterator());
    }

    ////////////////////////////////////////////////////////////////////////////
    // IDataSet interface

    public String[] getTableNames() throws DataSetException
    {
        return _dataSet.getTableNames();
    }

    public ITableMetaData getTableMetaData(String tableName) throws DataSetException
    {
        logger.debug("getTableMetaData(tableName={}) - start", tableName);
        return _dataSet.getTableMetaData(tableName);
    }

    public ITable getTable(String tableName) throws DataSetException
    {
        logger.debug("getTable(tableName={}) - start", tableName);
        return new SortedTable(_dataSet.getTable(tableName));
    }

    ////////////////////////////////////////////////////////////////////////////
    // SortedIterator class

    private class SortedIterator implements ITableIterator
    {
        private final ITableIterator _iterator;

        public SortedIterator(ITableIterator iterator)
        {
            _iterator = iterator;
        }

        ////////////////////////////////////////////////////////////////////////
        // ITableIterator interface

        public boolean next() throws DataSetException
        {
            return _iterator.next();
        }

        public ITableMetaData getTableMetaData() throws DataSetException
        {
            return _iterator.getTableMetaData();
        }

        public ITable getTable() throws DataSetException
        {
            return new SortedTable(_iterator.getTable());
        }
    }

}