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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D API, it supports a wide range of chart types including
bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts
and more.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-present, by David Gilbert and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ------------------
* DatasetReader.java
* ------------------
* (C) Copyright 2002-present, by David Gilbert.
*
* Original Author: David Gilbert;
* Contributor(s): -;
*
*/
package org.jfree.data.xml;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.XMLConstants;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.jfree.chart.util.Args;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.PieDataset;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
/**
* A utility class for reading datasets from XML.
*/
public class DatasetReader {
/** A factory for creating new parser instances. */
static SAXParserFactory factory;
/**
* Returns the {@link SAXParserFactory} used to create {@link SAXParser} instances.
*
* @return The {@link SAXParserFactory} (never {@code null}).
*/
public static SAXParserFactory getSAXParserFactory() {
if (factory == null) {
SAXParserFactory f = SAXParserFactory.newInstance();
try {
f.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
f.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
f.setFeature("http://xml.org/sax/features/external-general-entities", false);
factory = f;
} catch (SAXNotRecognizedException | SAXNotSupportedException | ParserConfigurationException e) {
throw new RuntimeException(e);
}
}
return factory;
}
/**
* Sets the SAXParserFactory that will be used to create SAXParser instances.
* You would only call this method if you wish to configure a new factory because
* the default does not meet requirements.
*
* @param f the new factory ({@code null} not permitted).
*/
public static void setSAXParserFactory(SAXParserFactory f) {
Args.nullNotPermitted(f, "f");
factory = f;
}
/**
* Reads a {@link PieDataset} from an XML file.
*
* @param file the file ({@code null} not permitted).
*
* @return A dataset.
*
* @throws IOException if there is a problem reading the file.
*/
public static PieDataset readPieDatasetFromXML(File file)
throws IOException {
InputStream in = new FileInputStream(file);
return readPieDatasetFromXML(in);
}
/**
* Reads a {@link PieDataset} from a stream.
*
* @param in the input stream.
*
* @return A dataset.
*
* @throws IOException if there is an I/O error.
*/
public static PieDataset readPieDatasetFromXML(InputStream in)
throws IOException {
PieDataset result = null;
try {
SAXParser parser = getSAXParserFactory().newSAXParser();
PieDatasetHandler handler = new PieDatasetHandler();
parser.parse(in, handler);
result = handler.getDataset();
}
catch (SAXException | ParserConfigurationException e) {
throw new RuntimeException(e);
}
return result;
}
/**
* Reads a {@link CategoryDataset} from a file.
*
* @param file the file.
*
* @return A dataset.
*
* @throws IOException if there is a problem reading the file.
*/
public static CategoryDataset readCategoryDatasetFromXML(File file)
throws IOException {
InputStream in = new FileInputStream(file);
return readCategoryDatasetFromXML(in);
}
/**
* Reads a {@link CategoryDataset} from a stream.
*
* @param in the stream.
*
* @return A dataset.
*
* @throws IOException if there is a problem reading the file.
*/
public static CategoryDataset readCategoryDatasetFromXML(InputStream in)
throws IOException {
CategoryDataset result = null;
try {
SAXParser parser = getSAXParserFactory().newSAXParser();
CategoryDatasetHandler handler = new CategoryDatasetHandler();
parser.parse(in, handler);
result = handler.getDataset();
}
catch (SAXException | ParserConfigurationException e) {
throw new RuntimeException(e);
}
return result;
}
}