001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 * DatasetReader.java
029 * ------------------
030 * (C) Copyright 2002-2008, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes
036 * -------
037 * 20-Nov-2002 : Version 1 (DG);
038 *
039 */
040
041 package org.jfree.data.xml;
042
043 import java.io.File;
044 import java.io.FileInputStream;
045 import java.io.IOException;
046 import java.io.InputStream;
047
048 import javax.xml.parsers.ParserConfigurationException;
049 import javax.xml.parsers.SAXParser;
050 import javax.xml.parsers.SAXParserFactory;
051
052 import org.jfree.data.category.CategoryDataset;
053 import org.jfree.data.general.PieDataset;
054 import org.xml.sax.SAXException;
055
056 /**
057 * A utility class for reading datasets from XML.
058 */
059 public class DatasetReader {
060
061 /**
062 * Reads a {@link PieDataset} from an XML file.
063 *
064 * @param file the file.
065 *
066 * @return A dataset.
067 *
068 * @throws IOException if there is a problem reading the file.
069 */
070 public static PieDataset readPieDatasetFromXML(File file)
071 throws IOException {
072 InputStream in = new FileInputStream(file);
073 return readPieDatasetFromXML(in);
074 }
075
076 /**
077 * Reads a {@link PieDataset} from a stream.
078 *
079 * @param in the input stream.
080 *
081 * @return A dataset.
082 *
083 * @throws IOException if there is an I/O error.
084 */
085 public static PieDataset readPieDatasetFromXML(InputStream in)
086 throws IOException {
087
088 PieDataset result = null;
089 SAXParserFactory factory = SAXParserFactory.newInstance();
090 try {
091 SAXParser parser = factory.newSAXParser();
092 PieDatasetHandler handler = new PieDatasetHandler();
093 parser.parse(in, handler);
094 result = handler.getDataset();
095 }
096 catch (SAXException e) {
097 System.out.println(e.getMessage());
098 }
099 catch (ParserConfigurationException e2) {
100 System.out.println(e2.getMessage());
101 }
102 return result;
103
104 }
105
106 /**
107 * Reads a {@link CategoryDataset} from a file.
108 *
109 * @param file the file.
110 *
111 * @return A dataset.
112 *
113 * @throws IOException if there is a problem reading the file.
114 */
115 public static CategoryDataset readCategoryDatasetFromXML(File file)
116 throws IOException {
117 InputStream in = new FileInputStream(file);
118 return readCategoryDatasetFromXML(in);
119 }
120
121 /**
122 * Reads a {@link CategoryDataset} from a stream.
123 *
124 * @param in the stream.
125 *
126 * @return A dataset.
127 *
128 * @throws IOException if there is a problem reading the file.
129 */
130 public static CategoryDataset readCategoryDatasetFromXML(InputStream in)
131 throws IOException {
132
133 CategoryDataset result = null;
134
135 SAXParserFactory factory = SAXParserFactory.newInstance();
136 try {
137 SAXParser parser = factory.newSAXParser();
138 CategoryDatasetHandler handler = new CategoryDatasetHandler();
139 parser.parse(in, handler);
140 result = handler.getDataset();
141 }
142 catch (SAXException e) {
143 System.out.println(e.getMessage());
144 }
145 catch (ParserConfigurationException e2) {
146 System.out.println(e2.getMessage());
147 }
148 return result;
149
150 }
151
152 }