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• MFAProperty.java

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fr.lirmm.graphik.integraal.rulesetanalyser.property.MFAProperty Maven / Gradle / Ivy

/*
 * 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.rulesetanalyser.property;

import java.util.LinkedList;
import java.util.List;

import fr.lirmm.graphik.integraal.GraalConstant;
import fr.lirmm.graphik.integraal.api.core.Atom;
import fr.lirmm.graphik.integraal.api.core.AtomSet;
import fr.lirmm.graphik.integraal.api.core.Predicate;
import fr.lirmm.graphik.integraal.api.core.Rule;
import fr.lirmm.graphik.integraal.api.core.RuleSet;
import fr.lirmm.graphik.integraal.api.core.Term;
import fr.lirmm.graphik.integraal.api.forward_chaining.Chase;
import fr.lirmm.graphik.integraal.api.forward_chaining.ChaseException;
import fr.lirmm.graphik.integraal.api.homomorphism.HomomorphismException;
import fr.lirmm.graphik.integraal.core.DefaultAtom;
import fr.lirmm.graphik.integraal.core.DefaultConjunctiveQuery;
import fr.lirmm.graphik.integraal.core.DefaultRule;
import fr.lirmm.graphik.integraal.core.Rules;
import fr.lirmm.graphik.integraal.core.grd.DefaultGraphOfRuleDependencies;
import fr.lirmm.graphik.integraal.core.ruleset.LinkedListRuleSet;
import fr.lirmm.graphik.integraal.core.term.DefaultTermFactory;
import fr.lirmm.graphik.integraal.forward_chaining.ChaseWithGRD;
import fr.lirmm.graphik.integraal.forward_chaining.halting_condition.FrontierRestrictedChaseHaltingCondition;
import fr.lirmm.graphik.integraal.forward_chaining.rule_applier.DefaultRuleApplier;
import fr.lirmm.graphik.integraal.homomorphism.SmartHomomorphism;
import fr.lirmm.graphik.integraal.rulesetanalyser.util.AnalyserRuleSet;

/**
 * There is no cycle of functional symbol during the skolem chase 
 * executed on the critical instance.
 */
public final class MFAProperty extends RuleSetProperty.Default {
	
	private static MFAProperty instance = null;

	private MFAProperty() { }

	public static synchronized MFAProperty instance() {
		if (instance == null) {
			instance = new MFAProperty();
		}
		return instance;
	}

	@Override
	public String getFullName() {
		return "Model-faithful acyclicity";
	}

	@Override
	public String getDescription() {
		return "The skolem chase executed on the critical instance does not produce any 'cycle of functional symbols'.";
	}

	/**
	 *
	 */
	@Override
	public int check(AnalyserRuleSet ruleSet) {
		RuleSet R = translateToMFA(ruleSet);
		AtomSet A = Rules.criticalInstance(ruleSet);
		Chase chase = new ChaseWithGRD(new DefaultGraphOfRuleDependencies(R), A, new DefaultRuleApplier(new FrontierRestrictedChaseHaltingCondition()));

		DefaultConjunctiveQuery Q = new DefaultConjunctiveQuery();
		DefaultAtom q = new DefaultAtom(C);
		q.setTerm(0,FAKE);
		Q.getAtomSet().add(q);

		try {
			while (chase.hasNext()) {
				chase.next();
				if (SmartHomomorphism.instance().exist(Q, A)) {
					return -1;
				}
			}
		}
		catch (ChaseException e) {
			// TODO throw Error or RuntimeException !
			return 0;
		} catch (HomomorphismException e) {
			return 0;
		}

		return 1;
	}

	@Override
	public String getLabel() {
		return "mfa";
	}

	@Override
	public Iterable getGeneralisations() {
		List gen = new LinkedList();
		gen.add(FESProperty.instance());
		gen.add(BTSProperty.instance());
		return gen;
	}

	public static RuleSet translateToMFA(Iterable rules) {
		RuleSet R = new LinkedListRuleSet();
		for (Rule r : rules) {
			for (Rule r2 : translateRuleToMFA(r))
				R.add(r2);
		}
		DefaultRule rule = new DefaultRule();
		Atom s = new DefaultAtom(S);
		s.setTerm(0,DefaultTermFactory.instance().createVariable("X1"));
		s.setTerm(1,DefaultTermFactory.instance().createVariable("X2"));
		Atom d = new DefaultAtom(D);
		d.setTerm(0,DefaultTermFactory.instance().createVariable("X1"));
		d.setTerm(1,DefaultTermFactory.instance().createVariable("X2"));
		rule.getBody().add(s);
		rule.getHead().add(d);

		R.add(rule);

		s = new DefaultAtom(S);
		d = new DefaultAtom(D);
		Atom d2 = new DefaultAtom(D);
		d.setTerm(0,DefaultTermFactory.instance().createVariable("X1"));
		d.setTerm(1,DefaultTermFactory.instance().createVariable("X2"));
		s.setTerm(0,DefaultTermFactory.instance().createVariable("X2"));
		s.setTerm(1,DefaultTermFactory.instance().createVariable("X3"));
		d2.setTerm(0,DefaultTermFactory.instance().createVariable("X1"));
		d2.setTerm(1,DefaultTermFactory.instance().createVariable("X3"));
		rule = new DefaultRule();
		rule.getBody().add(d);
		rule.getBody().add(s);
		rule.getHead().add(d2);

		R.add(rule);

		return R;
	}

	public static List translateRuleToMFA(final Rule r) {
		List result = new LinkedList();
		DefaultRule r2 = new DefaultRule(r);
		/*r2.setBody(r.getBody());
		r2.setHead(r.getHead());*/
		for (Term yi : r2.getExistentials()) {
			Predicate Fir = GraalConstant.freshPredicate(1);
			DefaultAtom f = new DefaultAtom(Fir);
			f.setTerm(0,yi);
			r2.getHead().add(f);
			for (Term xj : r2.getFrontier()) {
				DefaultAtom ss = new DefaultAtom(S);
				ss.setTerm(0,xj);
				ss.setTerm(1,yi);
				r2.getHead().add(ss);
			}

			DefaultRule r3 = new DefaultRule();
			DefaultAtom f1 = new DefaultAtom(Fir);
			f1.setTerm(0,DefaultTermFactory.instance().createVariable("X1"));
			DefaultAtom f2 = new DefaultAtom(Fir);
			f2.setTerm(0,DefaultTermFactory.instance().createVariable("X2"));
			DefaultAtom d = new DefaultAtom(D);
			d.setTerm(0,DefaultTermFactory.instance().createVariable("X1"));
			d.setTerm(1,DefaultTermFactory.instance().createVariable("X2"));

			r3.getBody().add(f1);
			r3.getBody().add(d);
			r3.getBody().add(f2);

			DefaultAtom c = new DefaultAtom(C);
			c.setTerm(0,FAKE);
			r3.getHead().add(c);

			result.add(r3);
		}
		result.add(r2);

		return result;
	}

	private static final Predicate D = GraalConstant.freshPredicate(2);
	private static final Predicate S = GraalConstant.freshPredicate(2);
	private static final Predicate C = GraalConstant.freshPredicate(1);
	private static final Term FAKE = GraalConstant.freshConstant();

};