    001/* ===========================================================
    002 * JFreeChart : a free chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
    006 *
    007 * Project Info:  http://www.jfree.org/jfreechart/index.html
    008 *
    009 * This library is free software; you can redistribute it and/or modify it
    010 * under the terms of the GNU Lesser General Public License as published by
    011 * the Free Software Foundation; either version 2.1 of the License, or
    012 * (at your option) any later version.
    013 *
    014 * This library is distributed in the hope that it will be useful, but
    015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017 * License for more details.
    018 *
    019 * You should have received a copy of the GNU Lesser General Public
    020 * License along with this library; if not, write to the Free Software
    021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022 * USA.
    023 *
    024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025 * Other names may be trademarks of their respective owners.]
    026 *
    027 * ----------------------
    028 * PieDatasetHandler.java
    029 * ----------------------
    030 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
    031 *
    032 * Original Author:  David Gilbert (for Object Refinery Limited);
    033 * Contributor(s):   -;
    034 *
    035 * Changes
    036 * -------
    037 * 23-Jan-2003 : Version 1 (DG);
    038 *
    039 */
    040
    041package org.jfree.data.xml;
    042
    043import org.jfree.data.general.DefaultPieDataset;
    044import org.jfree.data.general.PieDataset;
    045import org.xml.sax.Attributes;
    046import org.xml.sax.SAXException;
    047import org.xml.sax.helpers.DefaultHandler;
    048
    049/**
    050 * A SAX handler for reading a {@link PieDataset} from an XML file.
    051 */
    052public class PieDatasetHandler extends RootHandler implements DatasetTags {
    053
    054    /** The pie dataset under construction. */
    055    private DefaultPieDataset dataset;
    056
    057    /**
    058     * Default constructor.
    059     */
    060    public PieDatasetHandler() {
    061        this.dataset = null;
    062    }
    063
    064    /**
    065     * Returns the dataset.
    066     *
    067     * @return The dataset.
    068     */
    069    public PieDataset getDataset() {
    070        return this.dataset;
    071    }
    072
    073    /**
    074     * Adds an item to the dataset under construction.
    075     *
    076     * @param key  the key.
    077     * @param value  the value.
    078     */
    079    public void addItem(Comparable key, Number value) {
    080        this.dataset.setValue(key, value);
    081    }
    082
    083    /**
    084     * Starts an element.
    085     *
    086     * @param namespaceURI  the namespace.
    087     * @param localName  the element name.
    088     * @param qName  the element name.
    089     * @param atts  the element attributes.
    090     *
    091     * @throws SAXException for errors.
    092     */
    093    public void startElement(String namespaceURI,
    094                             String localName,
    095                             String qName,
    096                             Attributes atts) throws SAXException {
    097
    098        DefaultHandler current = getCurrentHandler();
    099        if (current != this) {
    100            current.startElement(namespaceURI, localName, qName, atts);
    101        }
    102        else if (qName.equals(PIEDATASET_TAG)) {
    103            this.dataset = new DefaultPieDataset();
    104        }
    105        else if (qName.equals(ITEM_TAG)) {
    106            ItemHandler subhandler = new ItemHandler(this, this);
    107            getSubHandlers().push(subhandler);
    108            subhandler.startElement(namespaceURI, localName, qName, atts);
    109        }
    110
    111    }
    112
    113    /**
    114     * The end of an element.
    115     *
    116     * @param namespaceURI  the namespace.
    117     * @param localName  the element name.
    118     * @param qName  the element name.
    119     *
    120     * @throws SAXException for errors.
    121     */
    122    public void endElement(String namespaceURI,
    123                           String localName,
    124                           String qName) throws SAXException {
    125
    126        DefaultHandler current = getCurrentHandler();
    127        if (current != this) {
    128            current.endElement(namespaceURI, localName, qName);
    129        }
    130
    131    }
    132
    133}