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 }