/* ===========================================================

 * JFreeChart : a free chart library for the Java(tm) platform

 * ===========================================================

 *

 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.

 *

 * Project Info:  http://www.jfree.org/jfreechart/index.html

 *

 * 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.

 *

 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 

 * in the United States and other countries.]

 *

 * ------------------

 * DatasetReader.java

 * ------------------

 * (C) Copyright 2002, 2003, by Object Refinery Limited.

 *

 * Original Author:  David Gilbert (for Object Refinery Limited);

 * Contributor(s):   -;

 *

 * $Id: DatasetReader.java,v 1.1 2004/08/31 15:35:26 mungady Exp $

 *

 * Changes

 * -------

 * 20-Nov-2002 : Version 1 (DG);

 *

 */



package org.jfree.data.xml;



import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;



import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;



import org.jfree.data.category.CategoryDataset;

import org.jfree.data.general.PieDataset;

import org.xml.sax.SAXException;



/**

 * A utility class for reading datasets from XML.

 *

 */

public class DatasetReader {



    /**

     * Reads a {@link PieDataset} from an XML file.

     *

     * @param file  the file.

     *

     * @return A dataset.

     *

     * @throws IOException if there is a problem reading the file.

     */

    public static PieDataset readPieDatasetFromXML(final File file) throws IOException {



        final InputStream in = new FileInputStream(file);

        return readPieDatasetFromXML(in);



    }



    /**

     * Reads a {@link PieDataset} from a stream.

     *

     * @param in  the input stream.

     *

     * @return A dataset.

     *

     * @throws IOException if there is an I/O error.

     */

    public static PieDataset readPieDatasetFromXML(final InputStream in) throws IOException {



        PieDataset result = null;



        final SAXParserFactory factory = SAXParserFactory.newInstance();

        try {

            final SAXParser parser = factory.newSAXParser();

            final PieDatasetHandler handler = new PieDatasetHandler();

            parser.parse(in, handler);

            result = handler.getDataset();

        }

        catch (SAXException e) {

            System.out.println(e.getMessage());

        }

        catch (ParserConfigurationException e2) {

            System.out.println(e2.getMessage());

        }



        return result;



    }



    /**

     * Reads a {@link CategoryDataset} from a file.

     *

     * @param file  the file.

     *

     * @return A dataset.

     *

     * @throws IOException if there is a problem reading the file.

     */

    public static CategoryDataset readCategoryDatasetFromXML(final File file) throws IOException {



        final InputStream in = new FileInputStream(file);

        return readCategoryDatasetFromXML(in);



    }



    /**

     * Reads a {@link CategoryDataset} from a stream.

     *

     * @param in  the stream.

     *

     * @return A dataset.

     *

     * @throws IOException if there is a problem reading the file.

     */

    public static CategoryDataset readCategoryDatasetFromXML(final InputStream in) throws IOException {



        CategoryDataset result = null;



        final SAXParserFactory factory = SAXParserFactory.newInstance();

        try {

            final SAXParser parser = factory.newSAXParser();

            final CategoryDatasetHandler handler = new CategoryDatasetHandler();

            parser.parse(in, handler);

            result = handler.getDataset();

        }

        catch (SAXException e) {

            System.out.println(e.getMessage());

        }

        catch (ParserConfigurationException e2) {

            System.out.println(e2.getMessage());

        }

        return result;



    }



}

