net.sf.tweety.arg.bipolar.reasoner.evidential.AdmissibleReasoner Maven / Gradle / Ivy

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/*
 *  This file is part of "TweetyProject", a collection of Java libraries for
 *  logical aspects of artificial intelligence and knowledge representation.
 *
 *  TweetyProject is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License version 3 as
 *  published by the Free Software Foundation.
 *
 *  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, see .
 *
 *  Copyright 2016 The TweetyProject Team 
 */
package net.sf.tweety.arg.bipolar.reasoner.evidential;

import net.sf.tweety.arg.bipolar.syntax.ArgumentSet;
import net.sf.tweety.arg.bipolar.syntax.BArgument;
import net.sf.tweety.arg.bipolar.syntax.EvidentialArgumentationFramework;

import java.util.*;

/**
 * a set of arguments S is admissible iff it is conflict-free and all elements of S are acceptable wrt. S.
 *
 * @author Lars Bengel
 *
 */
public class AdmissibleReasoner {
    public Collection getModels(EvidentialArgumentationFramework bbase) {
        Set extensions = new HashSet();
        // Check all conflict-free subsets
        ConflictFreeReasoner cfReasoner = new ConflictFreeReasoner();
        for(ArgumentSet ext: cfReasoner.getModels(bbase)){
            // every admissible set S has to contain Eta, since every argument in S has to be e-supported by S
            if (!ext.contains(bbase.getEta())) {
                continue;
            }
            boolean admissible = true;
            for (BArgument argument : ext) {
                if (!bbase.isAcceptable(argument, ext)) {
                    admissible = false;
                    break;
                }
            }
            if (admissible)
                extensions.add(new ArgumentSet(ext));
        }
        return extensions;
    }

    public ArgumentSet getModel(EvidentialArgumentationFramework bbase) {
        // as the empty set is always admissible we return that one.
        return new ArgumentSet();
    }
}