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 }