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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
 * |
 * +=======================================================================
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 * (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 General Public License V2.
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 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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 * 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
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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 GPL v2 license.
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 * although this will be appreciated by the PlantUML team.
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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 )
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 * Icons provided by OpenIconic :  https://useiconic.com/open
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 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
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 */
package net.sourceforge.plantuml.sequencediagram.graphic;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.sequencediagram.AbstractMessage;
import net.sourceforge.plantuml.sequencediagram.Note;
import net.sourceforge.plantuml.sequencediagram.NotePosition;
import net.sourceforge.plantuml.skin.ArrowConfiguration;
import net.sourceforge.plantuml.skin.Component;

abstract class Step1Abstract {

	private final StringBounder stringBounder;

	private final DrawableSet drawingSet;

	private final AbstractMessage message;

	private Frontier freeY2;

	private ArrowConfiguration config;

	private final List notes = new ArrayList<>();

	private ParticipantRange range;

	Step1Abstract(ParticipantRange range, StringBounder stringBounder, AbstractMessage message, DrawableSet drawingSet,
			Frontier freeY2) {
		this.range = range;
		this.stringBounder = stringBounder;
		this.message = message;
		this.freeY2 = Objects.requireNonNull(freeY2);
		this.drawingSet = drawingSet;
	}

	protected final ParticipantRange getParticipantRange() {
		return range;
	}

	abstract Frontier prepareMessage(ConstraintSet constraintSet, InGroupablesStack groupingStructures);

	protected final ArrowConfiguration getConfig() {
		return config;
	}

	protected final void setConfig(ArrowConfiguration config) {
		this.config = config.withThickness(drawingSet.getArrowThickness());
	}

	protected final List getNotes() {
		return notes;
	}

	protected final void addNote(Component note) {
		this.notes.add(note);
	}

	protected final StringBounder getStringBounder() {
		return stringBounder;
	}

	protected final AbstractMessage getMessage() {
		return message;
	}

	protected final DrawableSet getDrawingSet() {
		return drawingSet;
	}

	protected final Frontier getFreeY() {
		return freeY2;
	}

	protected final void incFreeY(double v) {
		freeY2 = freeY2.add(v, range);
	}

	protected final NoteBox createNoteBox(StringBounder stringBounder, Arrow arrow, Component noteComp,
			Note noteOnMessage) {
		final LivingParticipantBox p = arrow.getParticipantAt(stringBounder, noteOnMessage.getPosition());
		final NoteBox noteBox = new NoteBox(arrow.getStartingY(), noteComp, p, null, noteOnMessage.getPosition(),
				noteOnMessage.getUrl());

		if (arrow instanceof MessageSelfArrow) {
			boolean isReverseSelfArrow = ((MessageSelfArrow) arrow).isReverse();
			if (!isReverseSelfArrow && noteOnMessage.getPosition() == NotePosition.RIGHT) {
				noteBox.pushToRight(arrow.getPreferredWidth(stringBounder));
			}
			if (isReverseSelfArrow && noteOnMessage.getPosition() == NotePosition.LEFT) {
				noteBox.pushToRight(-arrow.getPreferredWidth(stringBounder));
			}
		}
		// if (arrow instanceof MessageExoArrow) {
		// final MessageExoType type = ((MessageExoArrow) arrow).getType();
		// if (type.isRightBorder()) {
		// final double width = noteBox.getPreferredWidth(stringBounder);
		// noteBox.pushToRight(-width);
		// }
		// }

		return noteBox;
	}

}