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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 Eclipse Public License.
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 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
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 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
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 * You may obtain a copy of the License at
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 * http://www.eclipse.org/legal/epl-v10.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.
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 * limitations under the License.
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 * messages are usually generated on welcome or error images and never on
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 * Icons provided by OpenIconic :  https://useiconic.com/open
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 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
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 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
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 *
 */
package net.sourceforge.plantuml.project.solver;

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

import net.sourceforge.plantuml.project.Load;
import net.sourceforge.plantuml.project.Value;
import net.sourceforge.plantuml.project.core.TaskAttribute;
import net.sourceforge.plantuml.project.time.Day;

public abstract class AbstractSolver implements Solver {

	protected final Map values = new LinkedHashMap();

	final public void setData(TaskAttribute attribute, Value value) {
		final Value previous = values.remove(attribute);
		if (previous != null && attribute == TaskAttribute.START) {
			final Day previousInstant = (Day) previous;
			if (previousInstant.compareTo((Day) value) > 0)
				value = previous;

		}
		values.put(attribute, value);
		if (values.size() > 2)
			removeFirstElement();

		assert values.size() <= 2;

	}

	private void removeFirstElement() {
		final Iterator> it = values.entrySet().iterator();
		it.next();
		it.remove();
	}

	final public Value getData(TaskAttribute attribute) {
		Value result = values.get(attribute);
		if (result == null) {
			if (attribute == TaskAttribute.END)
				return computeEnd();

			if (attribute == TaskAttribute.START)
				return computeStart();

			return Load.inWinks(1);
			// throw new UnsupportedOperationException(attribute.toString());
		}
		return result;
	}

	abstract protected Value computeEnd();

	abstract protected Value computeStart();

}