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 }