001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006     *
007     * Project Info:  http://www.jfree.org/jfreechart/index.html
008     *
009     * This library is free software; you can redistribute it and/or modify it 
010     * under the terms of the GNU Lesser General Public License as published by 
011     * the Free Software Foundation; either version 2.1 of the License, or 
012     * (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but 
015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017     * License for more details.
018     *
019     * You should have received a copy of the GNU Lesser General Public
020     * License along with this library; if not, write to the Free Software
021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022     * USA.  
023     *
024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025     * in the United States and other countries.]
026     *
027     * --------------------------
028     * CategorySeriesHandler.java
029     * --------------------------
030     * (C) Copyright 2003-2005, by Object Refinery Limited and Contributors.
031     *
032     * Original Author:  David Gilbert (for Object Refinery Limited);
033     * Contributor(s):   -;
034     *
035     * $Id: CategorySeriesHandler.java,v 1.4.2.2 2005/10/25 21:36:10 mungady Exp $
036     *
037     * Changes
038     * -------
039     * 23-Jan-2003 : Version 1 (DG);
040     *
041     */
042    
043    package org.jfree.data.xml;
044    
045    import java.util.Iterator;
046    
047    import org.jfree.data.DefaultKeyedValues;
048    import org.xml.sax.Attributes;
049    import org.xml.sax.SAXException;
050    import org.xml.sax.helpers.DefaultHandler;
051    
052    /**
053     * A handler for reading a series for a category dataset.
054     */
055    public class CategorySeriesHandler extends DefaultHandler 
056                                       implements DatasetTags {
057    
058        /** The root handler. */
059        private RootHandler root;
060    
061        /** The series key. */
062        private Comparable seriesKey;
063    
064        /** The values. */
065        private DefaultKeyedValues values;
066    
067        /**
068         * Creates a new item handler.
069         *
070         * @param root  the root handler.
071         */
072        public CategorySeriesHandler(RootHandler root) {
073            this.root = root;
074            this.values = new DefaultKeyedValues();
075        }
076    
077        /**
078         * Sets the series key.
079         *
080         * @param key  the key.
081         */
082        public void setSeriesKey(Comparable key) {
083            this.seriesKey = key;
084        }
085    
086        /**
087         * Adds an item to the temporary storage for the series.
088         *
089         * @param key  the key.
090         * @param value  the value.
091         */
092        public void addItem(Comparable key, final Number value) {
093            this.values.addValue(key, value);
094        }
095    
096        /**
097         * The start of an element.
098         *
099         * @param namespaceURI  the namespace.
100         * @param localName  the element name.
101         * @param qName  the element name.
102         * @param atts  the attributes.
103         *
104         * @throws SAXException for errors.
105         */
106        public void startElement(String namespaceURI,
107                                 String localName,
108                                 String qName,
109                                 Attributes atts) throws SAXException {
110    
111            if (qName.equals(SERIES_TAG)) {
112                setSeriesKey(atts.getValue("name"));
113                ItemHandler subhandler = new ItemHandler(this.root, this);
114                this.root.pushSubHandler(subhandler);
115            }
116            else if (qName.equals(ITEM_TAG)) {
117                ItemHandler subhandler = new ItemHandler(this.root, this);
118                this.root.pushSubHandler(subhandler);
119                subhandler.startElement(namespaceURI, localName, qName, atts);
120            }
121    
122            else {
123                throw new SAXException(
124                    "Expecting <Series> or <Item> tag...found " + qName
125                );
126            }
127        }
128    
129        /**
130         * The end of an element.
131         *
132         * @param namespaceURI  the namespace.
133         * @param localName  the element name.
134         * @param qName  the element name.
135         */
136        public void endElement(String namespaceURI,
137                               String localName,
138                               String qName) {
139    
140            if (this.root instanceof CategoryDatasetHandler) {
141                CategoryDatasetHandler handler = (CategoryDatasetHandler) this.root;
142    
143                Iterator iterator = this.values.getKeys().iterator();
144                while (iterator.hasNext()) {
145                    Comparable key = (Comparable) iterator.next();
146                    Number value = this.values.getValue(key);
147                    handler.addItem(this.seriesKey, key, value);
148                }
149    
150                this.root.popSubHandler();
151            }
152    
153        }
154    
155    }