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 * CategoryDatasetHandler.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: CategoryDatasetHandler.java,v 1.3.2.1 2005/10/25 21:36:10 mungady Exp $ 036 * 037 * Changes 038 * ------- 039 * 23-Jan-2003 : Version 1 (DG); 040 * 041 */ 042 043 package org.jfree.data.xml; 044 045 import org.jfree.data.category.CategoryDataset; 046 import org.jfree.data.category.DefaultCategoryDataset; 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 CategoryDataset} from an XML file. 053 */ 054 public class CategoryDatasetHandler extends RootHandler implements DatasetTags { 055 056 /** The dataset under construction. */ 057 private DefaultCategoryDataset dataset; 058 059 /** 060 * Creates a new handler. 061 */ 062 public CategoryDatasetHandler() { 063 this.dataset = null; 064 } 065 066 /** 067 * Returns the dataset. 068 * 069 * @return The dataset. 070 */ 071 public CategoryDataset getDataset() { 072 return this.dataset; 073 } 074 075 /** 076 * Adds an item to the dataset. 077 * 078 * @param rowKey the row key. 079 * @param columnKey the column key. 080 * @param value the value. 081 */ 082 public void addItem(Comparable rowKey, Comparable columnKey, Number value) { 083 this.dataset.addValue(value, rowKey, columnKey); 084 } 085 086 /** 087 * The start of an element. 088 * 089 * @param namespaceURI the namespace. 090 * @param localName the element name. 091 * @param qName the element name. 092 * @param atts the element attributes. 093 * 094 * @throws SAXException for errors. 095 */ 096 public void startElement(String namespaceURI, 097 String localName, 098 String qName, 099 Attributes atts) throws SAXException { 100 101 DefaultHandler current = getCurrentHandler(); 102 if (current != this) { 103 current.startElement(namespaceURI, localName, qName, atts); 104 } 105 else if (qName.equals(CATEGORYDATASET_TAG)) { 106 this.dataset = new DefaultCategoryDataset(); 107 } 108 else if (qName.equals(SERIES_TAG)) { 109 CategorySeriesHandler subhandler = new CategorySeriesHandler(this); 110 getSubHandlers().push(subhandler); 111 subhandler.startElement(namespaceURI, localName, qName, atts); 112 } 113 else { 114 throw new SAXException("Element not recognised: " + qName); 115 } 116 117 } 118 119 /** 120 * The end of an element. 121 * 122 * @param namespaceURI the namespace. 123 * @param localName the element name. 124 * @param qName the element name. 125 * 126 * @throws SAXException for errors. 127 */ 128 public void endElement(String namespaceURI, 129 String localName, 130 String qName) throws SAXException { 131 132 DefaultHandler current = getCurrentHandler(); 133 if (current != this) { 134 current.endElement(namespaceURI, localName, qName); 135 } 136 137 } 138 139 }