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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.

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/* ===========================================================
 * 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
 *
 * JSON.simple
 * -----------
 * The code in this file originates from the JSON.simple project by 
 * FangYidong:
 * 
 *     https://code.google.com/p/json-simple/
 *  
 * which is licensed under the Apache Software License version 2.0.  
 * 
 * It has been modified locally and repackaged under 
 * org.jfree.data.json.impl.* to avoid conflicts with any other version that
 * may be present on the classpath.
 * 
 */

package org.jfree.data.json.impl;


/**
 * Classes that support customized output of JSON text shall implement this 
 * interface.
 * 


 * This class is for internal use by JFreeChart, it is not 
 * part of the supported API and you should not call it directly.  If you need
 * JSON support in your project you should include JSON.simple 
 * (https://code.google.com/p/json-simple/) or some other JSON library directly
 * in your project.
 */
public interface JSONAware {
    
    /**
     * Returns a JSON string representing the object.
     * 
     * @return A JSON string.
     */
    String toJSONString();

}