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jfreechart example source code file (DatasetReader.java)

This example jfreechart source code file (DatasetReader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

categorydataset, categorydataset, categorydatasethandler, fileinputstream, io, ioexception, ioexception, parser, parserconfigurationexception, piedataset, piedataset, piedatasethandler, sax, saxexception, saxparser, saxparser, saxparserfactory, xml

The jfreechart DatasetReader.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------------
 * DatasetReader.java
 * ------------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * 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(File file)
        throws IOException {
        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(InputStream in)
        throws IOException {

        PieDataset result = null;
        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            SAXParser parser = factory.newSAXParser();
            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(File file)
        throws IOException {
        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(InputStream in)
        throws IOException {

        CategoryDataset result = null;

        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            SAXParser parser = factory.newSAXParser();
            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;

    }

}

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