001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2005, 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 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * ----------------------
028 * PieDatasetHandler.java
029 * ----------------------
030 * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * $Id: PieDatasetHandler.java,v 1.3.2.1 2005/10/25 21:36:10 mungady Exp $
036 *
037 * Changes (from 21-Jun-2001)
038 * --------------------------
039 * 23-Jan-2003 : Version 1 (DG);
040 *
041 */
042
043 package org.jfree.data.xml;
044
045 import org.jfree.data.general.DefaultPieDataset;
046 import org.jfree.data.general.PieDataset;
047 import org.xml.sax.Attributes;
048 import org.xml.sax.SAXException;
049 import org.xml.sax.helpers.DefaultHandler;
050
051 /**
052 * A SAX handler for reading a {@link PieDataset} from an XML file.
053 */
054 public class PieDatasetHandler extends RootHandler implements DatasetTags {
055
056 /** The pie dataset under construction. */
057 private DefaultPieDataset dataset;
058
059 /**
060 * Default constructor.
061 */
062 public PieDatasetHandler() {
063 this.dataset = null;
064 }
065
066 /**
067 * Returns the dataset.
068 *
069 * @return The dataset.
070 */
071 public PieDataset getDataset() {
072 return this.dataset;
073 }
074
075 /**
076 * Adds an item to the dataset under construction.
077 *
078 * @param key the key.
079 * @param value the value.
080 */
081 public void addItem(Comparable key, Number value) {
082 this.dataset.setValue(key, value);
083 }
084
085 /**
086 * Starts an element.
087 *
088 * @param namespaceURI the namespace.
089 * @param localName the element name.
090 * @param qName the element name.
091 * @param atts the element attributes.
092 *
093 * @throws SAXException for errors.
094 */
095 public void startElement(String namespaceURI,
096 String localName,
097 String qName,
098 Attributes atts) throws SAXException {
099
100 DefaultHandler current = getCurrentHandler();
101 if (current != this) {
102 current.startElement(namespaceURI, localName, qName, atts);
103 }
104 else if (qName.equals(PIEDATASET_TAG)) {
105 this.dataset = new DefaultPieDataset();
106 }
107 else if (qName.equals(ITEM_TAG)) {
108 ItemHandler subhandler = new ItemHandler(this, this);
109 getSubHandlers().push(subhandler);
110 subhandler.startElement(namespaceURI, localName, qName, atts);
111 }
112
113 }
114
115 /**
116 * The end of an element.
117 *
118 * @param namespaceURI the namespace.
119 * @param localName the element name.
120 * @param qName the element name.
121 *
122 * @throws SAXException for errors.
123 */
124 public void endElement(String namespaceURI,
125 String localName,
126 String qName) throws SAXException {
127
128 DefaultHandler current = getCurrentHandler();
129 if (current != this) {
130 current.endElement(namespaceURI, localName, qName);
131 }
132
133 }
134
135 }