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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.AbstractDataSet;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.ITable;
import org.dbunit.dataset.ITableIterator;
import org.dbunit.dataset.ITableMetaData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Dataset that consumes producer asynchronously.
 *
 * @author Manuel Laflamme
 * @author Last changed by: $Author$
 * @version $Revision$ $Date$
 * @since Apr 18, 2003
 */
public class StreamingDataSet extends AbstractDataSet
{

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

    private IDataSetProducer _source;
    private int _iteratorCount;

    public StreamingDataSet(IDataSetProducer source)
    {
        _source = source;
    }

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

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

        if (reversed)
        {
            throw new UnsupportedOperationException(
                    "Reverse iterator not supported!");
        }

        if (_iteratorCount > 0)
        {
            throw new UnsupportedOperationException(
                    "Only one iterator allowed!");
        }

        _iteratorCount++;
        return new StreamingIterator(_source);
    }

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

    /**
     * Not supported.
     * @throws UnsupportedOperationException
     */
    public String[] getTableNames() throws DataSetException
    {
        throw new UnsupportedOperationException();
    }

    /**
     * Not supported.
     * @throws UnsupportedOperationException
     */
    public ITableMetaData getTableMetaData(String tableName) throws DataSetException
    {
        logger.debug("getTableMetaData(tableName={}) - start", tableName);

        throw new UnsupportedOperationException();
    }

    /**
     * Not supported.
     * @throws UnsupportedOperationException
     */
    public ITable getTable(String tableName) throws DataSetException
    {
        logger.debug("getTable(tableName={}) - start", tableName);

        throw new UnsupportedOperationException();
    }

}