/*******************************************************************************
* 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.constraints;

import java.io.Serializable;

import org.sat4j.core.Vec;
import org.sat4j.minisat.core.Constr;
import org.sat4j.minisat.core.DataStructureFactory;
import org.sat4j.minisat.core.ILits;
import org.sat4j.minisat.core.Learner;
import org.sat4j.minisat.core.Propagatable;
import org.sat4j.minisat.core.UnitPropagationListener;
import org.sat4j.specs.ContradictionException;
import org.sat4j.specs.IVec;
import org.sat4j.specs.IVecInt;

/**
 * @author leberre To change the template for this generated type comment go to
 *         Window>Preferences>Java>Code Generation>Code and Comments
 */
public abstract class AbstractDataStructureFactory<L extends ILits> implements
        DataStructureFactory<L>, Serializable {

    /**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/*
     * (non-Javadoc)
     * 
     * @see org.sat4j.minisat.core.DataStructureFactory#conflictDetectedInWatchesFor(int)
     */
    public void conflictDetectedInAttachesFor(int p, int i) {
        for (int j = i + 1; j < tmp.size(); j++) {
            lits.attach(p, tmp.get(j));
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.sat4j.minisat.core.DataStructureFactory#getWatchesFor(int)
     */
    public IVec<Propagatable> getAttachesFor(int p) {
        tmp.clear();
        lits.attaches(p).moveTo(tmp);
        return tmp;
    }

    protected L lits;
    
    protected AbstractDataStructureFactory() {
        lits = createLits();
    }

    protected abstract L createLits(); 
    
    private final IVec<Propagatable> tmp = new Vec<Propagatable>();

    /*
     * (non-Javadoc)
     * 
     * @see org.sat4j.minisat.DataStructureFactory#createVocabulary()
     */
    public L getVocabulary() {
        return lits;
    }

    protected UnitPropagationListener solver;

    protected Learner learner;

    public void setUnitPropagationListener(UnitPropagationListener s) {
        solver = s;
    }

    public void setLearner(Learner learner) {
        this.learner = learner;
    }

    public void reset() {
    }

    public void learnConstraint(Constr constr) {
        learner.learn(constr);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.sat4j.minisat.core.DataStructureFactory#createCardinalityConstraint(org.sat4j.specs.VecInt,
     *      int)
     */
    public Constr createCardinalityConstraint(IVecInt literals, int degree)
            throws ContradictionException {
        throw new UnsupportedOperationException();
    }
}