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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.
/* ===========================================================
* 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
*
* 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;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* A JSON object. Key value pairs are unordered.
*
* 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 class JSONObject extends HashMap implements Map, JSONAware,
JSONStreamAware {
private static final long serialVersionUID = -503443796854799292L;
/**
* Encode a map into JSON text and write it to out.
* If this map is also a {@link JSONAware} or {@link JSONStreamAware},
* {@code JSONAware} or {@code JSONStreamAware} specific
* behaviours will be ignored at this top level.
*
* @see org.jfree.data.json.impl.JSONValue#writeJSONString(Object, Writer)
*
* @param map the map to write ({@code null} permitted).
* @param out the output writer ({@code null} not permitted).
*
* @throws IOException if there is an I/O problem.
*/
public static void writeJSONString(Map map, Writer out) throws IOException {
if (map == null) {
out.write("null");
return;
}
boolean first = true;
Iterator iter = map.entrySet().iterator();
out.write('{');
while (iter.hasNext()) {
if (first) {
first = false;
}
else {
out.write(',');
}
Map.Entry entry = (Map.Entry) iter.next();
out.write('\"');
out.write(JSONValue.escape(String.valueOf(entry.getKey())));
out.write('\"');
out.write(':');
JSONValue.writeJSONString(entry.getValue(), out);
}
out.write('}');
}
/**
* Writes a JSON string representing this object instance to the specified
* output writer.
*
* @param out the output writer ({@code null} not permitted).
*
* @throws IOException if there is an I/O problem.
*/
@Override
public void writeJSONString(Writer out) throws IOException {
writeJSONString(this, out);
}
/**
* Convert a map to JSON text. The result is a JSON object.
* If this map is also a {@link JSONAware}, {@code JSONAware} specific
* behaviours will be omitted at this top level.
*
* @see org.jfree.data.json.impl.JSONValue#toJSONString(Object)
*
* @param map the map ({@code null} permitted).
*
* @return JSON text, or "null" if map is null.
*/
public static String toJSONString(Map map){
if (map == null) {
return "null";
}
StringBuffer sb = new StringBuffer();
boolean first = true;
Iterator iter = map.entrySet().iterator();
sb.append('{');
while (iter.hasNext()) {
if (first) {
first = false;
}
else {
sb.append(',');
}
Map.Entry entry = (Map.Entry) iter.next();
toJSONString(String.valueOf(entry.getKey()), entry.getValue(), sb);
}
sb.append('}');
return sb.toString();
}
/**
* Returns a JSON string representing this object.
*
* @return A JSON string.
*/
@Override
public String toJSONString(){
return toJSONString(this);
}
/**
* Writes a key and value to a JSON string.
*
* @param key the key ({@code null} permitted).
* @param value the value ({@code null} permitted).
* @param sb a string buffer ({@code null} not permitted).
*
* @return A JSON string fragment representing the key and value.
*/
private static String toJSONString(String key, Object value,
StringBuffer sb) {
sb.append('\"');
if (key == null) {
sb.append("null");
}
else {
JSONValue.escape(key, sb);
}
sb.append('\"').append(':');
sb.append(JSONValue.toJSONString(value));
return sb.toString();
}
/**
* Returns a string representation of this object.
*
* @return A string.
*/
@Override
public String toString(){
return toJSONString();
}
/**
* Returns a JSON string fragment containing the key and value.
*
* @param key the key ({@code null} permitted).
* @param value the value ({@code null} permitted).
*
* @return A JSON string fragment.
*/
public static String toString(String key, Object value){
StringBuffer sb = new StringBuffer();
toJSONString(key, value, sb);
return sb.toString();
}
}