/*
 * Copyright (C) INRIA, 2012-2013
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

package fr.inrialpes.tyrexmo.qcwrapper.sparqlalg;

import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.sparql.algebra.Algebra;

import amod.PropertyTester;
import fr.inrialpes.tyrexmo.queryanalysis.CommonWrapper;
import fr.inrialpes.tyrexmo.queryanalysis.TransformAlgebra;
import fr.inrialpes.tyrexmo.testqc.ContainmentTestException;
import fr.inrialpes.tyrexmo.testqc.LegacyContainmentSolver;
import fr.inrialpes.tyrexmo.testqc.simple.SimpleContainmentSolver;

public class SPARQLAlgebraWrapper extends CommonWrapper implements LegacyContainmentSolver, SimpleContainmentSolver {

    public void warmup() {};

    /**
     * Developed based on the model of amod.PropertyTester
     */
    public boolean entailed( Query q1, Query q2 ) throws ContainmentTestException {
    if ( supportedTest( q1, q2 ) ) {
        PropertyTester solver = new PropertyTester();
        return solver.isContained( Algebra.compile(q1), Algebra.compile(q2) );
    } else {
        throw new ContainmentTestException( "Cannot deal with such a test" );
    }
    }

    public boolean entailedUnderSchema( Model schema, Query q1, Query q2 ) throws ContainmentTestException {
    throw new ContainmentTestException( "Cannot deal with schema" );
    };

    public boolean entailedUnderSchema( String schema, Query q1, Query q2 ) throws ContainmentTestException {
    throw new ContainmentTestException( "Cannot deal with schema" );
    };

    public void cleanup() {};

    private boolean supportedTest( Query q1, Query q2 ) {
    TransformAlgebra ta1 = new TransformAlgebra( q1 );
    TransformAlgebra ta2 = new TransformAlgebra( q2 );
    if ( containsOptional( ta1, ta2 ) || isValidQueryType( q1, q2 ) || isCyclic( ta1, ta2 ) )
        return false;
    else
        return true;
    }

    @Override
    public boolean entailed(String queryStr1, String queryStr2) {
        Query q1 = QueryFactory.create(queryStr1);
        Query q2 = QueryFactory.create(queryStr2);
        boolean result;
        try {
            result = entailed(q1, q2);
        } catch (ContainmentTestException e) {
            throw new RuntimeException(e);
        }
        return result;
    }
}