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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML 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 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.graphml;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.io.OutputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import net.sourceforge.plantuml.abel.Entity;
import net.sourceforge.plantuml.descdiagram.DescriptionDiagram;
import net.sourceforge.plantuml.xmi.XmlDiagramTransformer;
import net.sourceforge.plantuml.xml.XmlFactories;

public class GraphmlDescriptionDiagram implements XmlDiagramTransformer {

	private final DescriptionDiagram diagram;
	private final Document document;

	public GraphmlDescriptionDiagram(DescriptionDiagram diagram) throws ParserConfigurationException {
		this.diagram = diagram;

		final DocumentBuilder builder = XmlFactories.newDocumentBuilder();
		this.document = builder.newDocument();
		document.setXmlVersion("1.0");
		document.setXmlStandalone(true);

		final Element graphml = document.createElement("graphml");
		graphml.setAttribute("xmlns", "http://graphml.graphdrawing.org/xmlns");
		graphml.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
		graphml.setAttribute("xsi:schemaLocation", "http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd");
		document.appendChild(graphml);

		final Element graph = document.createElement("graph");
		graph.setAttribute("edgedefault", "undirected");
		graphml.appendChild(graph);

		for (final Entity ent : diagram.leafs())
			if (ent.getParentContainer().isRoot())
				addElement(ent, graph);

	}

	private void addElement(Entity tobeAdded, Element container) {
		final Element element = createEntityNode(tobeAdded);
		container.appendChild(element);

	}

	private Element createEntityNode(Entity entity) {
		final Element cla = document.createElement("node");
		cla.setAttribute("id", entity.getName());
		return cla;
	}

	public void transformerXml(OutputStream os) throws TransformerException, ParserConfigurationException {
		final Source source = new DOMSource(document);

		final Result resultat = new StreamResult(os);

		final Transformer transformer = XmlFactories.newTransformer();
		transformer.setOutputProperty(OutputKeys.INDENT, "yes");
		transformer.setOutputProperty(OutputKeys.ENCODING, UTF_8.name());
		transformer.transform(source, resultat);
	}

}