net.sourceforge.plantuml.gitlog.GNode Maven / Gradle / Ivy

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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.gitlog;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import net.sourceforge.plantuml.klimt.creole.Display;

public class GNode {

	private final List up = new ArrayList<>();
	private final List down = new ArrayList<>();
	private final List texts = new ArrayList<>();

	private String comment;

	public void addText(String text) {
		this.texts.add(text);
	}

	public boolean isTop() {
		return up.size() == 0;
	}

	public final String getComment() {
		return comment;
	}

	public void setComment(String comment) {
		this.comment = comment;
	}

	public static void link(GNode n1, GNode n2) {
		n1.down.add(n2);
		n2.up.add(n1);
	}

	@Override
	public String toString() {
		return texts.toString();
	}

	public Display getDisplay() {
		return Display.create(texts);
	}

	public Collection getDowns() {
		return Collections.unmodifiableCollection(down);
	}

	public boolean canEatTheNextOne() {
		if (up.size() != 1)
			return false;

		if (down.size() != 1)
			return false;

		final GNode next = down.get(0);
		if (next.up.size() != 1)
			return false;

		if (next.down.size() != 1)
			return false;

		return true;
	}

	public GNode eatTheNextOne() {
		if (canEatTheNextOne() == false)
			throw new IllegalStateException();

		final GNode removed = down.get(0);
		final GNode newNext = removed.down.get(0);
		this.texts.addAll(removed.texts);
		this.down.set(0, newNext);
		if (newNext.up.remove(removed) == false)
			throw new IllegalStateException();

		newNext.up.add(this);
		return removed;
	}

}