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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------ 28: * DatasetReader.java 29: * ------------------ 30: * (C) Copyright 2002-2007, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 20-Nov-2002 : Version 1 (DG); 38: * 39: */ 40: 41: package org.jfree.data.xml; 42: 43: import java.io.File; 44: import java.io.FileInputStream; 45: import java.io.IOException; 46: import java.io.InputStream; 47: 48: import javax.xml.parsers.ParserConfigurationException; 49: import javax.xml.parsers.SAXParser; 50: import javax.xml.parsers.SAXParserFactory; 51: 52: import org.jfree.data.category.CategoryDataset; 53: import org.jfree.data.general.PieDataset; 54: import org.xml.sax.SAXException; 55: 56: /** 57: * A utility class for reading datasets from XML. 58: */ 59: public class DatasetReader { 60: 61: /** 62: * Reads a {@link PieDataset} from an XML file. 63: * 64: * @param file the file. 65: * 66: * @return A dataset. 67: * 68: * @throws IOException if there is a problem reading the file. 69: */ 70: public static PieDataset readPieDatasetFromXML(File file) 71: throws IOException { 72: InputStream in = new FileInputStream(file); 73: return readPieDatasetFromXML(in); 74: } 75: 76: /** 77: * Reads a {@link PieDataset} from a stream. 78: * 79: * @param in the input stream. 80: * 81: * @return A dataset. 82: * 83: * @throws IOException if there is an I/O error. 84: */ 85: public static PieDataset readPieDatasetFromXML(InputStream in) 86: throws IOException { 87: 88: PieDataset result = null; 89: SAXParserFactory factory = SAXParserFactory.newInstance(); 90: try { 91: SAXParser parser = factory.newSAXParser(); 92: PieDatasetHandler handler = new PieDatasetHandler(); 93: parser.parse(in, handler); 94: result = handler.getDataset(); 95: } 96: catch (SAXException e) { 97: System.out.println(e.getMessage()); 98: } 99: 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: }