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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: * CategoryDatasetHandler.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.category.CategoryDataset; 44: import org.jfree.data.category.DefaultCategoryDataset; 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 CategoryDataset} from an XML file. 51: */ 52: public class CategoryDatasetHandler extends RootHandler implements DatasetTags { 53: 54: /** The dataset under construction. */ 55: private DefaultCategoryDataset dataset; 56: 57: /** 58: * Creates a new handler. 59: */ 60: public CategoryDatasetHandler() { 61: this.dataset = null; 62: } 63: 64: /** 65: * Returns the dataset. 66: * 67: * @return The dataset. 68: */ 69: public CategoryDataset getDataset() { 70: return this.dataset; 71: } 72: 73: /** 74: * Adds an item to the dataset. 75: * 76: * @param rowKey the row key. 77: * @param columnKey the column key. 78: * @param value the value. 79: */ 80: public void addItem(Comparable rowKey, Comparable columnKey, Number value) { 81: this.dataset.addValue(value, rowKey, columnKey); 82: } 83: 84: /** 85: * The start of an element. 86: * 87: * @param namespaceURI the namespace. 88: * @param localName the element name. 89: * @param qName the element name. 90: * @param atts the element attributes. 91: * 92: * @throws SAXException for errors. 93: */ 94: public void startElement(String namespaceURI, 95: String localName, 96: String qName, 97: Attributes atts) throws SAXException { 98: 99: DefaultHandler current = getCurrentHandler(); 100: if (current != this) { 101: current.startElement(namespaceURI, localName, qName, atts); 102: } 103: else if (qName.equals(CATEGORYDATASET_TAG)) { 104: this.dataset = new DefaultCategoryDataset(); 105: } 106: else if (qName.equals(SERIES_TAG)) { 107: CategorySeriesHandler subhandler = new CategorySeriesHandler(this); 108: getSubHandlers().push(subhandler); 109: subhandler.startElement(namespaceURI, localName, qName, atts); 110: } 111: else { 112: throw new SAXException("Element not recognised: " + qName); 113: } 114: 115: } 116: 117: /** 118: * The end of an element. 119: * 120: * @param namespaceURI the namespace. 121: * @param localName the element name. 122: * @param qName the element name. 123: * 124: * @throws SAXException for errors. 125: */ 126: public void endElement(String namespaceURI, 127: String localName, 128: String qName) throws SAXException { 129: 130: DefaultHandler current = getCurrentHandler(); 131: if (current != this) { 132: current.endElement(namespaceURI, localName, qName); 133: } 134: 135: } 136: 137: }