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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.stream;

import org.dbunit.dataset.Column;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.ITable;
import org.dbunit.dataset.ITableIterator;
import org.dbunit.dataset.ITableMetaData;
import org.dbunit.dataset.RowOutOfBoundsException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Implementation of {@link IDataSetProducer} based on a given {@link IDataSet} or a
 * {@link ITableIterator}.
 * 
 * @author Manuel Laflamme
 * @author Last changed by: $Author: gommma $
 * @version $Revision: 782 $ $Date: 2008-08-10 23:02:02 +0200 (dom, 10 ago 2008) $
 * @since Apr 17, 2003
 */
public class DataSetProducerAdapter implements IDataSetProducer
{

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

    private static final IDataSetConsumer EMPTY_CONSUMER = new DefaultConsumer();

    private final ITableIterator _iterator;
    private IDataSetConsumer _consumer = EMPTY_CONSUMER;

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

    public DataSetProducerAdapter(IDataSet dataSet) throws DataSetException
    {
        _iterator = dataSet.iterator();
    }

    ////////////////////////////////////////////////////////////////////////////
    // IDataSetProducer interface

    public void setConsumer(IDataSetConsumer consumer) throws DataSetException
    {
        logger.debug("setConsumer(consumer) - start");

        _consumer = consumer;
    }

    public void produce() throws DataSetException
    {
        logger.debug("produce() - start");

        _consumer.startDataSet();
        while(_iterator.next())
        {
            ITable table = _iterator.getTable();
            ITableMetaData metaData = table.getTableMetaData();

            _consumer.startTable(metaData);
            try
            {
                Column[] columns = metaData.getColumns();
                if (columns.length == 0)
                {
                    _consumer.endTable();
                    continue;
                }

                for (int i = 0; ; i++)
                {
                    Object[] values = new Object[columns.length];
                    for (int j = 0; j < columns.length; j++)
                    {
                        Column column = columns[j];
                        values[j] = table.getValue(i, column.getColumnName());
                    }
                    _consumer.row(values);
                }
            }
            catch (RowOutOfBoundsException e)
            {
            	// This exception occurs when records are exhausted
            	// and we reach the end of the table.  Ignore this error
            	// and close table.

                // end of table
                _consumer.endTable();
            }
        }
        _consumer.endDataSet();
    }
}