/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------------------
* CategoryDatasetHandler.java
* ---------------------------
* (C) Copyright 2003, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: CategoryDatasetHandler.java,v 1.1 2004/08/31 15:35:26 mungady Exp $
*
* Changes
* -------
* 23-Jan-2003 : Version 1 (DG);
*
*/
package org.jfree.data.xml;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* A SAX handler for reading a {@link CategoryDataset} from an XML file.
*
*/
public class CategoryDatasetHandler extends RootHandler implements DatasetTags {
/** The dataset under construction. */
private DefaultCategoryDataset dataset;
/**
* Creates a new handler.
*/
public CategoryDatasetHandler() {
this.dataset = null;
}
/**
* Returns the dataset.
*
* @return The dataset.
*/
public CategoryDataset getDataset() {
return this.dataset;
}
/**
* Adds an item to the dataset.
*
* @param rowKey the row key.
* @param columnKey the column key.
* @param value the value.
*/
public void addItem(final Comparable rowKey, final Comparable columnKey, final Number value) {
this.dataset.addValue(value, rowKey, columnKey);
}
/**
* The start of an element.
*
* @param namespaceURI the namespace.
* @param localName the element name.
* @param qName the element name.
* @param atts the element attributes.
*
* @throws SAXException for errors.
*/
public void startElement(final String namespaceURI,
final String localName,
final String qName,
final Attributes atts) throws SAXException {
final DefaultHandler current = getCurrentHandler();
if (current != this) {
current.startElement(namespaceURI, localName, qName, atts);
}
else if (qName.equals(CATEGORYDATASET_TAG)) {
this.dataset = new DefaultCategoryDataset();
}
else if (qName.equals(SERIES_TAG)) {
final CategorySeriesHandler subhandler = new CategorySeriesHandler(this);
getSubHandlers().push(subhandler);
subhandler.startElement(namespaceURI, localName, qName, atts);
}
else {
throw new SAXException("Element not recognised: " + qName);
}
}
/**
* The end of an element.
*
* @param namespaceURI the namespace.
* @param localName the element name.
* @param qName the element name.
*
* @throws SAXException for errors.
*/
public void endElement(final String namespaceURI,
final String localName,
final String qName) throws SAXException {
final DefaultHandler current = getCurrentHandler();
if (current != this) {
current.endElement(namespaceURI, localName, qName);
}
}
}