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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.
/* +=======================================================================
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 * |      PlantUML : a free UML diagram generator
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 * (C) Copyright 2009-2024, Arnaud Roques
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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();

}