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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.utils;

import org.apache.commons.lang3.tuple.Pair;

import fr.lirmm.graphik.integraal.api.core.Atom;
import fr.lirmm.graphik.integraal.api.core.RulesCompilation;
import fr.lirmm.graphik.integraal.api.core.Substitution;
import fr.lirmm.graphik.integraal.api.core.Term;
import fr.lirmm.graphik.integraal.api.store.Store;

/**
 * @author Clément Sipieter (INRIA) {@literal }
 *
 */
public final class ProbaUtils {

	// /////////////////////////////////////////////////////////////////////////
	// CONSTRUCTORS
	// /////////////////////////////////////////////////////////////////////////

	private ProbaUtils() {
	}

	// /////////////////////////////////////////////////////////////////////////
	// PUBLIC METHODS
	// /////////////////////////////////////////////////////////////////////////

	/**
	 * Compute the probability to have one specific instance of the specified
	 * atom over data
	 * 
	 * @param atom
	 * @param data
	 * @param rc
	 * @return the probability to have the specified atom over specified data.
	 */
	public static double computeProba(Atom atom, Store data, RulesCompilation rc) {
		int count = 0;
		for (Pair im : rc.getRewritingOf(atom)) {
			count += data.size(im.getLeft().getPredicate());
		}

		double probaA ;
		if(count == 0) {
			probaA = 0.0;
		} else {
			int nbCst = 0;
			int nbVar = 0;
			for(Term t : atom) {
				if (t.isConstant()) {
					++nbCst;
				} else {
					++nbVar;
				}
			} 
			int domSize = data.getDomainSize();
			probaA = (count/(Math.pow(domSize,nbCst)) / Math.pow(data.getDomainSize(), nbVar));

		}

		return probaA;
	}

	// /////////////////////////////////////////////////////////////////////////
	// OBJECT OVERRIDE METHODS
	// /////////////////////////////////////////////////////////////////////////

	// /////////////////////////////////////////////////////////////////////////
	// PRIVATE METHODS
	// /////////////////////////////////////////////////////////////////////////

}