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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
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 * Project Info:  https://plantuml.com
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 * 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.
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 * 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.
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 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
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 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
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 * 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.
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 * The generated images can then be used without any reference to the LGPL license.
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 * although this will be appreciated by the PlantUML team.
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 * 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
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 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
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 * 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.cheneer.command;

import net.sourceforge.plantuml.abel.Entity;
import net.sourceforge.plantuml.abel.Link;
import net.sourceforge.plantuml.abel.LinkArg;
import net.sourceforge.plantuml.cheneer.ChenEerDiagram;
import net.sourceforge.plantuml.command.CommandExecutionResult;
import net.sourceforge.plantuml.command.SingleLineCommand2;
import net.sourceforge.plantuml.decoration.LinkDecor;
import net.sourceforge.plantuml.decoration.LinkType;
import net.sourceforge.plantuml.klimt.color.NoSuchColorException;
import net.sourceforge.plantuml.klimt.creole.Display;
import net.sourceforge.plantuml.plasma.Quark;
import net.sourceforge.plantuml.regex.IRegex;
import net.sourceforge.plantuml.regex.RegexConcat;
import net.sourceforge.plantuml.regex.RegexLeaf;
import net.sourceforge.plantuml.regex.RegexOptional;
import net.sourceforge.plantuml.regex.RegexResult;
import net.sourceforge.plantuml.utils.LineLocation;

public class CommandAssociate extends SingleLineCommand2 {

	public CommandAssociate() {
		super(getRegexConcat());
	}

	protected static IRegex getRegexConcat() {
		return RegexConcat.build(CommandCreateEntity.class.getName(), RegexLeaf.start(), //
				new RegexLeaf("NAME1", "([\\w-]+)"), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf("PARTICIPATION", "([-=])"), //
				new RegexOptional( //
						new RegexLeaf("CARDINALITY", "(\\w+|\\(\\w+,[%s]*\\w+\\))")), //
				new RegexLeaf("PARTICIPATION2", "([-=])"), //
				RegexLeaf.spaceZeroOrMore(), //
				new RegexLeaf("NAME2", "([\\w-]+)"), //
				RegexLeaf.end());
	}

	@Override
	protected CommandExecutionResult executeArg(ChenEerDiagram diagram, LineLocation location, RegexResult arg)
			throws NoSuchColorException {
		final String name1 = diagram.cleanId(arg.get("NAME1", 0));
		final String name2 = diagram.cleanId(arg.get("NAME2", 0));
		final boolean isDouble = arg.get("PARTICIPATION", 0).equals("=");
		final String cardinality = arg.get("CARDINALITY", 0);

		final Quark quark1 = diagram.quarkInContext(true, name1);
		final Entity entity1 = quark1.getData();
		if (entity1 == null) {
			return CommandExecutionResult.error("No such entity: " + name1);
		}

		final Quark quark2 = diagram.quarkInContext(true, name2);
		final Entity entity2 = quark2.getData();
		if (entity2 == null) {
			return CommandExecutionResult.error("No such entity: " + name2);
		}

		LinkType linkType = new LinkType(LinkDecor.NONE, LinkDecor.NONE);
		if (isDouble) {
			linkType = linkType.goBold();
		}
		final Link link = new Link(diagram, diagram.getCurrentStyleBuilder(), entity1, entity2, linkType,
				LinkArg.build(Display.getWithNewlines(cardinality), 3));
		link.setPortMembers(diagram.getPortId(entity1.getName()), diagram.getPortId(entity2.getName()));
		diagram.addLink(link);

		return CommandExecutionResult.ok();
	}

}