/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, 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.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* --------------------------
* CategorySeriesHandler.java
* --------------------------
* (C) Copyright 2003-2007, 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 java.util.Iterator;
import org.jfree.data.DefaultKeyedValues;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* A handler for reading a series for a category dataset.
*/
public class CategorySeriesHandler extends DefaultHandler
implements DatasetTags {
/** The root handler. */
private RootHandler root;
/** The series key. */
private Comparable seriesKey;
/** The values. */
private DefaultKeyedValues values;
/**
* Creates a new item handler.
*
* @param root the root handler.
*/
public CategorySeriesHandler(RootHandler root) {
this.root = root;
this.values = new DefaultKeyedValues();
}
/**
* Sets the series key.
*
* @param key the key.
*/
public void setSeriesKey(Comparable key) {
this.seriesKey = key;
}
/**
* Adds an item to the temporary storage for the series.
*
* @param key the key.
* @param value the value.
*/
public void addItem(Comparable key, final Number value) {
this.values.addValue(key, value);
}
/**
* The start of an element.
*
* @param namespaceURI the namespace.
* @param localName the element name.
* @param qName the element name.
* @param atts the attributes.
*
* @throws SAXException for errors.
*/
public void startElement(String namespaceURI,
String localName,
String qName,
Attributes atts) throws SAXException {
if (qName.equals(SERIES_TAG)) {
setSeriesKey(atts.getValue("name"));
ItemHandler subhandler = new ItemHandler(this.root, this);
this.root.pushSubHandler(subhandler);
}
else if (qName.equals(ITEM_TAG)) {
ItemHandler subhandler = new ItemHandler(this.root, this);
this.root.pushSubHandler(subhandler);
subhandler.startElement(namespaceURI, localName, qName, atts);
}
else {
throw new SAXException(
"Expecting <Series> or <Item> tag...found " + qName
);
}
}
/**
* The end of an element.
*
* @param namespaceURI the namespace.
* @param localName the element name.
* @param qName the element name.
*/
public void endElement(String namespaceURI,
String localName,
String qName) {
if (this.root instanceof CategoryDatasetHandler) {
CategoryDatasetHandler handler = (CategoryDatasetHandler) this.root;
Iterator iterator = this.values.getKeys().iterator();
while (iterator.hasNext()) {
Comparable key = (Comparable) iterator.next();
Number value = this.values.getValue(key);
handler.addItem(this.seriesKey, key, value);
}
this.root.popSubHandler();
}
}
}
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