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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.homomorphism.scheduler;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import fr.lirmm.graphik.integraal.api.core.AtomSet;
import fr.lirmm.graphik.integraal.api.core.InMemoryAtomSet;
import fr.lirmm.graphik.integraal.api.core.RulesCompilation;
import fr.lirmm.graphik.integraal.api.core.Term;
import fr.lirmm.graphik.integraal.api.core.Variable;
import fr.lirmm.graphik.integraal.homomorphism.Var;
import fr.lirmm.graphik.integraal.homomorphism.VarSharedData;

/**
 * Compute an order over variables from h. This scheduler put answer
 * variables first, then other variables are put in the lexical order.
 *
 * @author Clément Sipieter (INRIA) {@literal }
 *
 */
public class ComparableOrderScheduler extends AbstractScheduler implements Scheduler {

	private static ComparableOrderScheduler instance;

	private ComparableOrderScheduler() {
		super();
	}

	public static synchronized ComparableOrderScheduler instance() {
		if (instance == null)
			instance = new ComparableOrderScheduler();

		return instance;
	}

	@Override
	public VarSharedData[] execute(InMemoryAtomSet query, Set preAffectedVars, List ans, AtomSet data, RulesCompilation rc) {
		InMemoryAtomSet h = (preAffectedVars.isEmpty())? query : computeFixedQuery(query, preAffectedVars);

		List terms = new LinkedList<>(h.getVariables());
		Collections.sort(terms);
		VarSharedData[] vars = new VarSharedData[terms.size() + 2];

		int level = 0;
		vars[level] = new VarSharedData(level);

		Set alreadyAffected = new TreeSet();
		for (Term t : ans) {
			if (terms.contains(t) && !alreadyAffected.contains(t)) {
				++level;
				vars[level] = new VarSharedData(level);
				vars[level].value = (Variable) t;
				alreadyAffected.add(t);
			}
		}

		int lastAnswerVariable = level;

		for (Term t : terms) {
			if (!alreadyAffected.contains(t)) {
				++level;
				vars[level] = new VarSharedData(level);
				vars[level].value = (Variable) t;
			}
		}

		++level;
		vars[level] = new VarSharedData(level);
		vars[level].previousLevel = lastAnswerVariable;

		return vars;
	}

	@Override
	public void clear() {
		
	}
	@Override
	public boolean isAllowed(Var var, Term image) {
		return true;
	}
	
	@Override
	public String getInfos(Var var) {
		return "";
	}
	

}