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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2020, by Object Refinery Limited 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.]
 *
 * --------------------
 * PieURLGenerator.java
 * --------------------
 * (C) Copyright 2002-2020, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributors:     David Gilbert (for Object Refinery Limited);
 *
 */

package org.jfree.chart.urls;

import org.jfree.data.general.PieDataset;

/**
 * Interface for a URL generator for plots that use data from a
 * {@link PieDataset}.  Classes that implement this interface:
 * 
 * are responsible for correctly escaping any text that is derived from the
 *     dataset, as this may be user-specified and could pose a security
 *     risk;
 * should be either (a) immutable, or (b) cloneable via the
 *     {@code PublicCloneable} interface (defined in the JCommon class
 *     library).  This provides a mechanism for the referring plot to clone
 *     the generator if necessary.
 * 
 */
public interface PieURLGenerator {

    /**
     * Generates a URL for one item in a {@link PieDataset}. As a guideline,
     * the URL should be valid within the context of an XHTML 1.0 document.
     *
     * @param dataset  the dataset ({@code null} not permitted).
     * @param key  the item key ({@code null} not permitted).
     * @param pieIndex  the pie index (differentiates between pies in a
     *                  'multi' pie chart).
     *
     * @return A string containing the URL.
     */
    public String generateURL(PieDataset dataset, Comparable key, int pieIndex);

}