/* ===========================================================
* 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.]
*
* ----------------
* ItemHandler.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 org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* A handler for reading key-value items.
*/
public class ItemHandler extends DefaultHandler implements DatasetTags {
/** The root handler. */
private RootHandler root;
/** The parent handler (can be the same as root, but not always). */
private DefaultHandler parent;
/** The key. */
private Comparable key;
/** The value. */
private Number value;
/**
* Creates a new item handler.
*
* @param root the root handler.
* @param parent the parent handler.
*/
public ItemHandler(RootHandler root, DefaultHandler parent) {
this.root = root;
this.parent = parent;
this.key = null;
this.value = null;
}
/**
* Returns the key that has been read by the handler, or <code>null</code>.
*
* @return The key.
*/
public Comparable getKey() {
return this.key;
}
/**
* Sets the key.
*
* @param key the key.
*/
public void setKey(Comparable key) {
this.key = key;
}
/**
* Returns the key that has been read by the handler, or <code>null</code>.
*
* @return The value.
*/
public Number getValue() {
return this.value;
}
/**
* Sets the value.
*
* @param value the value.
*/
public void setValue(Number value) {
this.value = 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(ITEM_TAG)) {
KeyHandler subhandler = new KeyHandler(this.root, this);
this.root.pushSubHandler(subhandler);
}
else if (qName.equals(VALUE_TAG)) {
ValueHandler subhandler = new ValueHandler(this.root, this);
this.root.pushSubHandler(subhandler);
}
else {
throw new SAXException(
"Expected <Item> or <Value>...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.parent instanceof PieDatasetHandler) {
PieDatasetHandler handler = (PieDatasetHandler) this.parent;
handler.addItem(this.key, this.value);
this.root.popSubHandler();
}
else if (this.parent instanceof CategorySeriesHandler) {
CategorySeriesHandler handler = (CategorySeriesHandler) this.parent;
handler.addItem(this.key, this.value);
this.root.popSubHandler();
}
}
}
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