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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.xml;

import org.dbunit.dataset.Column;
import org.dbunit.dataset.DataSetException;
import org.dbunit.dataset.IDataSet;

import java.io.PrintWriter;
import java.io.Writer;

/**
 * @author Manuel Laflamme
 * @since Jun 13, 2003
 * @version $Revision: 404 $
 */
public class FlatDtdWriter //implements IDataSetConsumer
{
    public static final ContentModel SEQUENCE = new SequenceModel();
    public static final ContentModel CHOICE = new ChoiceModel();

    private Writer _writer;
    private ContentModel _contentModel;

    public FlatDtdWriter(Writer writer)
    {
        _writer = writer;
        _contentModel = SEQUENCE;
    }

    public void setContentModel(ContentModel contentModel)
    {
        _contentModel = contentModel;
    }

    public void write(IDataSet dataSet) throws DataSetException
    {
        PrintWriter printOut = new PrintWriter(_writer);
        String[] tableNames = dataSet.getTableNames();

        // dataset element
        printOut.print("\n");
        printOut.print("\n");

        // tables
        for (int i = 0; i < tableNames.length; i++)
        {
            // table element
            String tableName = tableNames[i];
            printOut.print("\n");

            // column attributes
            printOut.print("\n");
            printOut.print("\n");
        }

        printOut.flush();
    }

    public static abstract class ContentModel
    {
        private final String _name;

        private ContentModel(String name)
        {
            _name = name;
        }

        public String toString()
        {
            return _name;
        }

        public abstract void write(PrintWriter writer, String tableName,
                int tableIndex, int tableCount);
    }

    public static class SequenceModel extends ContentModel
    {
        private SequenceModel()
        {
            super("sequence");
        }

        public void write(PrintWriter writer, String tableName, int tableIndex, int tableCount)
        {
            boolean last = (tableIndex + 1) == tableCount;

            writer.print("    ");
            writer.print(tableName);
            writer.print("*");
            if (!last)
            {
                writer.print(",\n");
            }
        }
    }

    public static class ChoiceModel extends ContentModel
    {
        private ChoiceModel()
        {
            super("sequence");
        }

        public void write(PrintWriter writer, String tableName, int tableIndex, int tableCount)
        {
            boolean first = tableIndex == 0;
            boolean last = (tableIndex + 1) == tableCount;

            if (first)
            {
                writer.print("   (");
            }
            else
            {
                writer.print("    ");
            }
            writer.print(tableName);

            if (!last)
            {
                writer.print("|\n");
            }
            else
            {
                writer.print(")*");
            }
        }
    }
}