/*******************************************************************************
* 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.cnf;
import java.io.Serializable;
import org.sat4j.core.VecInt;
import org.sat4j.minisat.core.Constr;
import org.sat4j.minisat.core.ILits;
import org.sat4j.minisat.core.UnitPropagationListener;
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 class BinaryClauses implements Constr, Serializable {
private static final long serialVersionUID = 1L;
private final ILits voc;
private final IVecInt clauses = new VecInt();
private final int reason;
private int conflictindex = -1;
/**
*
*/
public BinaryClauses(ILits voc, int p) {
this.voc = voc;
this.reason = p;
}
public void addBinaryClause(int p) {
clauses.push(p);
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#remove()
*/
public void remove() {
// do nothing
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#propagate(org.sat4j.minisat.UnitPropagationListener,
* int)
*/
public boolean propagate(UnitPropagationListener s, int p) {
// assert voc.isFalsified(this.reason);
voc.attach(p, this);
for (int i = 0; i < clauses.size(); i++) {
int q = clauses.get(i);
if (!s.enqueue(q, this)) {
conflictindex = i;
return false;
}
}
return true;
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#simplify()
*/
public boolean simplify() {
IVecInt locclauses = clauses;
final int size = clauses.size();
for (int i = 0; i < size; i++) {
if (voc.isSatisfied(locclauses.get(i))) {
return true;
}
if (voc.isFalsified(locclauses.get(i))) {
locclauses.delete(i);
}
}
return false;
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#undo(int)
*/
public void undo(int p) {
// no to do
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#calcReason(int, org.sat4j.datatype.VecInt)
*/
public void calcReason(int p, IVecInt outReason) {
outReason.push(this.reason ^ 1);
if (p == ILits.UNDEFINED) {
// int i=0;
// while(!voc.isFalsified(clauses.get(i))) {
// i++;
// }
assert conflictindex > -1;
outReason.push(clauses.get(conflictindex) ^ 1);
}
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#learnt()
*/
public boolean learnt() {
return false;
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#incActivity(double)
*/
public void incActivity(double claInc) {
// TODO Auto-generated method stub
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#getActivity()
*/
public double getActivity() {
// TODO Auto-generated method stub
return 0;
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#locked()
*/
public boolean locked() {
return false;
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#setLearnt()
*/
public void setLearnt() {
// TODO Auto-generated method stub
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#register()
*/
public void register() {
// TODO Auto-generated method stub
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#rescaleBy(double)
*/
public void rescaleBy(double d) {
// TODO Auto-generated method stub
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#size()
*/
public int size() {
return clauses.size();
}
/*
* (non-Javadoc)
*
* @see org.sat4j.minisat.Constr#get(int)
*/
public int get(int i) {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
public void assertConstraint(UnitPropagationListener s) {
throw new UnsupportedOperationException();
}
}