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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
 *
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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.
 *
 * 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.
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 * 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.cheneer;

import java.util.Map;
import java.util.Stack;

import net.sourceforge.plantuml.abel.Entity;
import net.sourceforge.plantuml.classdiagram.AbstractEntityDiagram;
import net.sourceforge.plantuml.core.UmlSource;
import net.sourceforge.plantuml.skin.UmlDiagramType;

public class ChenEerDiagram extends AbstractEntityDiagram {

	public ChenEerDiagram(UmlSource source, Map skinParam) {
		super(source, UmlDiagramType.CHEN_EER, skinParam);
	}

	private final Stack ownerStack = new Stack();

	/**
	 * Pushes the owner of the following attributes.
	 *
	 * @see #peekOwner()
	 * @param group the entity that owns the following attributes
	 */
	public void pushOwner(Entity group) {
		ownerStack.push(group);
	}

	/**
	 * Pops an attribute owner from the stack. See also {@link #peekOwner()}.
	 * 
	 * @see #peekOwner()
	 * @return true if an owner was popped, false if the stack was empty
	 */
	public boolean popOwner() {
		if (ownerStack.isEmpty()) {
			return false;
		}
		ownerStack.pop();
		return true;
	}

	/**
	 * Returns the owner of the current attribute.
	 * 
	 * 
	 * This is used to link attributes based on their lexical position (how they
	 * appear in sources) without nesting the entities (like how packages are
	 * done). It is for this reason that we can't use CucaDiagram.getCurrentGroup,
	 * as that method nests the entities.
	 *
	 * @return the owner of the current attribute, or null if there is no owner
	 */
	public Entity peekOwner() {
		if (ownerStack.isEmpty()) {
			return null;
		}
		return ownerStack.peek();
	}

}