/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ---------------------------
* CategoryDatasetHandler.java
* ---------------------------
* (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* 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(Comparable rowKey, Comparable columnKey, 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.
*/
@Override
public void startElement(String namespaceURI,
String localName,
String qName,
Attributes atts) throws SAXException {
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)) {
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.
*/
@Override
public void endElement(String namespaceURI,
String localName,
String qName) throws SAXException {
DefaultHandler current = getCurrentHandler();
if (current != this) {
current.endElement(namespaceURI, localName, qName);
}
}
}