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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
*
* 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.]
*
* --------------
* JSONUtils.java
* --------------
* (C) Copyright 2014-present, by David Gilbert.
*
* Original Author: David Gilbert;
* Contributor(s): -;
*
*/
package org.jfree.data.json;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;
import org.jfree.chart.util.Args;
import org.jfree.data.KeyedValues;
import org.jfree.data.KeyedValues2D;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.data.json.impl.JSONValue;
/**
* A utility class that can read and write data in specific JSON formats.
*/
public class JSONUtils {
/**
* Returns a string containing the data in JSON format. The format is
* an array of arrays, where each sub-array represents one data value.
* The sub-array should contain two items, first the item key as a string
* and second the item value as a number. For example:
* {@code [["Key A", 1.0], ["Key B", 2.0]]}
*
* Note that this method can be used with instances of {@link PieDataset}.
*
* @param data the data ({@code null} not permitted).
*
* @return A string in JSON format.
*/
public static String writeKeyedValues(KeyedValues data) {
Args.nullNotPermitted(data, "data");
StringWriter sw = new StringWriter();
try {
writeKeyedValues(data, sw);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
return sw.toString();
}
/**
* Writes the data in JSON format to the supplied writer.
*
* Note that this method can be used with instances of {@link PieDataset}.
*
* @param data the data ({@code null} not permitted).
* @param writer the writer ({@code null} not permitted).
*
* @throws IOException if there is an I/O problem.
*/
public static void writeKeyedValues(KeyedValues data, Writer writer)
throws IOException {
Args.nullNotPermitted(data, "data");
Args.nullNotPermitted(writer, "writer");
writer.write("[");
boolean first = true;
Iterator iterator = data.getKeys().iterator();
while (iterator.hasNext()) {
Comparable key = (Comparable) iterator.next();
if (!first) {
writer.write(", ");
} else {
first = false;
}
writer.write("[");
writer.write(JSONValue.toJSONString(key.toString()));
writer.write(", ");
writer.write(JSONValue.toJSONString(data.getValue(key)));
writer.write("]");
}
writer.write("]");
}
/**
* Returns a string containing the data in JSON format. The format is...
*
* Note that this method can be used with instances of
* {@link CategoryDataset}.
*
* @param data the data ({@code null} not permitted).
*
* @return A string in JSON format.
*/
public static String writeKeyedValues2D(KeyedValues2D data) {
Args.nullNotPermitted(data, "data");
StringWriter sw = new StringWriter();
try {
writeKeyedValues2D(data, sw);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
return sw.toString();
}
/**
* Writes the data in JSON format to the supplied writer.
*
* Note that this method can be used with instances of
* {@link CategoryDataset}.
*
* @param data the data ({@code null} not permitted).
* @param writer the writer ({@code null} not permitted).
*
* @throws IOException if there is an I/O problem.
*/
public static void writeKeyedValues2D(KeyedValues2D data, Writer writer)
throws IOException {
Args.nullNotPermitted(data, "data");
Args.nullNotPermitted(writer, "writer");
List> columnKeys = data.getColumnKeys();
List> rowKeys = data.getRowKeys();
writer.write("{");
if (!columnKeys.isEmpty()) {
writer.write("\"columnKeys\": [");
boolean first = true;
for (Comparable columnKey : columnKeys) {
if (!first) {
writer.write(", ");
} else {
first = false;
}
writer.write(JSONValue.toJSONString(columnKey.toString()));
}
writer.write("]");
}
if (!rowKeys.isEmpty()) {
writer.write(", \"rows\": [");
boolean firstRow = true;
for (Comparable rowKey : rowKeys) {
if (!firstRow) {
writer.write(", [");
} else {
writer.write("[");
firstRow = false;
}
// write the row data
writer.write(JSONValue.toJSONString(rowKey.toString()));
writer.write(", [");
boolean first = true;
for (Comparable columnKey : columnKeys) {
if (!first) {
writer.write(", ");
} else {
first = false;
}
writer.write(JSONValue.toJSONString(data.getValue(rowKey,
columnKey)));
}
writer.write("]]");
}
writer.write("]");
}
writer.write("}");
}
}
