/*******************************************************************************
* SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU Lesser General Public License Version 2.1 or later (the
* "LGPL"), in which case the provisions of the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of the LGPL, and not to allow others to use your version of
* this file under the terms of the EPL, indicate your decision by deleting
* the provisions above and replace them with the notice and other provisions
* required by the LGPL. If you do not delete the provisions above, a recipient
* may use your version of this file under the terms of the EPL or the LGPL.
* 
* Based on the original MiniSat specification from:
* 
* An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
* Sixth International Conference on Theory and Applications of Satisfiability
* Testing, LNCS 2919, pp 502-518, 2003.
*
* See www.minisat.se for the original solver in C++.
* 
*******************************************************************************/
package org.sat4j.minisat.learning;

import org.sat4j.minisat.core.Constr;
import org.sat4j.minisat.core.DataStructureFactory;
import org.sat4j.minisat.core.ILits;
import org.sat4j.minisat.core.Solver;

/**
 * MiniSAT learning scheme.
 * 
 * The Data Structure Factory  is expected to be set thanks to the 
 * appropriate setter method before using it.
 * 
 * It was not possible to set it in the constructor.
 * 
 * @author leberre
 */
public class MiniSATLearning<L extends ILits,D extends DataStructureFactory<L>> extends AbstractLearning<L,D> {
    private static final long serialVersionUID = 1L;

    private DataStructureFactory<L> dsf;

    public void setDataStructureFactory(DataStructureFactory<L> dsf) {
        this.dsf = dsf;
    }

    @Override
    public void setSolver(Solver<L,D> s) {
        super.setSolver(s);
        this.dsf = s.getDSFactory();
    }

    public void learns(Constr constr) {
        // va contenir une nouvelle clause ou null si la clause est unitaire
        claBumpActivity(constr);
        dsf.learnConstraint(constr);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
         return "Learn all clauses as in MiniSAT";
    }
    
}