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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ---------------------- 28: * PieDatasetHandler.java 29: * ---------------------- 30: * (C) Copyright 2003-2007, by Object Refinery Limited and Contributors. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 23-Jan-2003 : Version 1 (DG); 38: * 39: */ 40: 41: package org.jfree.data.xml; 42: 43: import org.jfree.data.general.DefaultPieDataset; 44: import org.jfree.data.general.PieDataset; 45: import org.xml.sax.Attributes; 46: import org.xml.sax.SAXException; 47: import org.xml.sax.helpers.DefaultHandler; 48: 49: /** 50: * A SAX handler for reading a {@link PieDataset} from an XML file. 51: */ 52: public class PieDatasetHandler extends RootHandler implements DatasetTags { 53: 54: /** The pie dataset under construction. */ 55: private DefaultPieDataset dataset; 56: 57: /** 58: * Default constructor. 59: */ 60: public PieDatasetHandler() { 61: this.dataset = null; 62: } 63: 64: /** 65: * Returns the dataset. 66: * 67: * @return The dataset. 68: */ 69: public PieDataset getDataset() { 70: return this.dataset; 71: } 72: 73: /** 74: * Adds an item to the dataset under construction. 75: * 76: * @param key the key. 77: * @param value the value. 78: */ 79: public void addItem(Comparable key, Number value) { 80: this.dataset.setValue(key, value); 81: } 82: 83: /** 84: * Starts an element. 85: * 86: * @param namespaceURI the namespace. 87: * @param localName the element name. 88: * @param qName the element name. 89: * @param atts the element attributes. 90: * 91: * @throws SAXException for errors. 92: */ 93: public void startElement(String namespaceURI, 94: String localName, 95: String qName, 96: Attributes atts) throws SAXException { 97: 98: DefaultHandler current = getCurrentHandler(); 99: 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: }