pstlab / PLATINUm

import it.cnr.istc.pst.platinum.ai.framework.domain.component.Decision;

/**

 * 

 * @author alessandro

 *

 */

public class PrecedenceConstraint implements Comparable<PrecedenceConstraint>

{

	private Decision reference;				// reference decision of the precedence constraint

	private Decision target;				// target decision of the precedence constraint

	private double preserved;				// value computed by means of heuristics introduced in [Laborie 2005]

	/**

	 * 

	 * @param reference

	 * @param target

	 */

	protected PrecedenceConstraint(Decision reference, Decision target) {

		this.reference = reference;

		this.target = target;

	}

	/**

	 * 

	 * @param preserved

	 */

	public void setPreservedSpace(double preserved) {

		this.preserved = preserved;

	}

	/**

	 * 

	 * @return

	 */

	public double getPreservedValue() {

		return this.preserved;

	}

	/**

	 * 

	 * @return

	 */

	public Decision getReference() {

		return reference;

	}

	/**

	 * 

	 * @return

	 */

	public Decision getTarget() {

		return target;

	}

	/**

	 * 

	 */

	@Override

	public String toString() {

		// JSON style object description

		return "{ \"type\": \"PRECEDENCE_CONSTRAINT\", "

				+ "\"reference\": " + this.reference + ", "

				+ "\"target\": " + this.target + ", "

				+ "\"preserved-space-heuristic\": " + this.preserved + " }";

	}

	/**

	 * 

	 */

}