NGMTaskFixedDuration.java

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 * Original Author:  Mario Kušek
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package net.sourceforge.plantuml.project.ngm;

import java.time.Duration;
import java.time.LocalDateTime;

/**
 * Represents a fixed-duration task in the New Gantt Model (NGM).
 *
 * <p>In a fixed-duration task, the calendar span between start and end is
 * intrinsic and does not change. The load becomes a derived quantity that
 * depends on the workload allocation.</p>
 *
 * <p>Example: "Crossing the Atlantic takes 7 days regardless of crew size".</p>
 *
 * @see NGMTask
 */
public class NGMTaskFixedDuration extends NGMTask {

	private final Duration duration;
	private LocalDateTime start;

	/**
	 * Constructs a fixed-duration task with the specified workload and duration.
	 *
	 * @param workload the workload allocation for the task
	 * @param duration the intrinsic duration of the task
	 */
	public NGMTaskFixedDuration(NGMAllocation workload, Duration duration) {
		super(workload);
		this.duration = duration;
	}

	@Override
	public LocalDateTime getStart() {
		return start;
	}

	@Override
	public void setStart(LocalDateTime start) {
		this.start = start;
	}

	@Override
	public LocalDateTime getEnd() {
		return start.plus(duration);
	}

	@Override
	public void setEnd(LocalDateTime end) {
		start = end.minus(duration);
	}

	@Override
	public Duration getDuration() {
		return duration;
	}

	@Override
	public NGMTotalEffort getTotalEffort() {
		throw new UnsupportedOperationException("Work In Progress");
	}

}