fr.lirmm.graphik.integraal.api.forward_chaining.ChaseHaltingCondition Maven / Gradle / Ivy

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Rule base analysis for InteGraal. This is imported from Graal
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/*
 * Copyright (C) Inria Sophia Antipolis - Méditerranée / LIRMM
 * (Université de Montpellier & CNRS) (2014 - 2017)
 *
 * Contributors :
 *
 * Clément SIPIETER 
 * Mélanie KÖNIG
 * Swan ROCHER
 * Jean-François BAGET
 * Michel LECLÈRE
 * Marie-Laure MUGNIER 
 *
 *
 * This file is part of Graal .
 *
 * This software is governed by the CeCILL  license under French law and
 * abiding by the rules of distribution of free software.  You can  use,
 * modify and/ or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */
/**
 * 
 */
package fr.lirmm.graphik.integraal.api.forward_chaining;


import fr.lirmm.graphik.integraal.api.core.Atom;
import fr.lirmm.graphik.integraal.api.core.AtomSet;
import fr.lirmm.graphik.integraal.api.core.Rule;
import fr.lirmm.graphik.integraal.api.core.Substitution;
import fr.lirmm.graphik.integraal.api.homomorphism.HomomorphismException;
import fr.lirmm.graphik.integraal.api.homomorphism.HomomorphismFactoryException;
import fr.lirmm.graphik.util.stream.CloseableIterator;

/**
 * The ChaseHaltingCondition interface provides a way to control when a
 * saturation process will stop.
 * 
 * @author Clément Sipieter (INRIA) 
 *
 */
public interface ChaseHaltingCondition {

	/**
	 * This method should return the atoms to actually add.
	 * 
	 * @param rule
	 *            The rule which is triggered
	 * @param substitution
	 *            A homomorphism of the rule body found. The existential
	 *            variables are not substitued.
	 * @param data
	 *            The data over which this rule is applied.
	 * @return A full substitution or null if the application is reduntant. The
	 *         returned substitution should substitutes all variables of the
	 *         head of the rule.
	 * 
	 * @throws HomomorphismFactoryException
	 * @throws HomomorphismException
	 */
	CloseableIterator apply(Rule rule, Substitution substitution, AtomSet data) throws HomomorphismFactoryException,
	                                                                          HomomorphismException;
}