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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.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.dbunit.dataset.AbstractDataSet;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.DefaultTableIterator;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.ITable;
import org.dbunit.dataset.ITableIterator;
import org.dbunit.dataset.OrderedTableNameMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This dataset implementation can read and write MS Excel documents. Each
 * sheet represents a table. The first row of a sheet defines the columns names
 * and remaining rows contains the data.
 *
 * @author Manuel Laflamme
 * @since Feb 21, 2003
 * @version $Revision: 875 $
 */
public class XlsDataSet extends AbstractDataSet
{
    
    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(XlsDataSet.class);

    private final OrderedTableNameMap _tables;


    /**
     * Creates a new XlsDataSet object that loads the specified Excel document.
     */
    public XlsDataSet(File file) throws IOException, DataSetException
    {
        this(new FileInputStream(file));
    }

    /**
     * Creates a new XlsDataSet object that loads the specified Excel document.
     */
    public XlsDataSet(InputStream in) throws IOException, DataSetException
    {
        _tables = super.createTableNameMap();
        
        HSSFWorkbook workbook = new HSSFWorkbook(in);
        int sheetCount = workbook.getNumberOfSheets();
        for (int i = 0; i < sheetCount; i++)
        {
            ITable table = new XlsTable(workbook.getSheetName(i),
                    workbook.getSheetAt(i));
            _tables.add(table.getTableMetaData().getTableName(), table);            
        }
    }

    /**
     * Write the specified dataset to the specified Excel document.
     */
    public static void write(IDataSet dataSet, OutputStream out)
            throws IOException, DataSetException
    {
        logger.debug("write(dataSet={}, out={}) - start", dataSet, out);

        new XlsDataSetWriter().write(dataSet, out);
    }


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

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

    	ITable[] tables = (ITable[]) _tables.orderedValues().toArray(new ITable[0]);
        return new DefaultTableIterator(tables, reversed);
    }
}