/*******************************************************************************
* 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.tools;
import java.io.Serializable;
import org.sat4j.core.VecInt;
import org.sat4j.specs.ContradictionException;
import org.sat4j.specs.ISolver;
import org.sat4j.specs.IVecInt;
/**
* Very simple Dimacs array reader. Allow solvers to read the constraints from
* arrays that effectively contain Dimacs formatted lines (without the
* terminating 0).
*
* Adaptation of org.sat4j.reader.DimacsReader.
*
* @author dlb
* @author fuhs
*/
public class DimacsArrayReader implements Serializable {
private static final long serialVersionUID = 1L;
protected final ISolver solver;
public DimacsArrayReader(ISolver solver) {
this.solver = solver;
}
protected boolean handleConstr(int gateType, int output, int[] inputs)
throws ContradictionException {
IVecInt literals = new VecInt(inputs);
solver.addClause(literals);
return true;
}
/**
* @param gateType
* gateType[i] is the type of gate i according to the Extended
* Dimacs specs; ignored in DimacsArrayReader, but important for
* inheriting classes
* @param outputs
* outputs[i] is the number of the output; ignored in
* DimacsArrayReader
* @param inputs
* inputs[i] contains the clauses in DimacsArrayReader; an
* overriding class might have it contain the inputs of the
* current gate
* @param maxVar
* the maximum number of assigned ids
* @throws ContradictionException
* si le probleme est trivialement inconsitant
*/
public ISolver parseInstance(int[] gateType, int[] outputs,
int[][] inputs, int maxVar) throws ContradictionException {
solver.reset();
solver.newVar(maxVar);
solver.setExpectedNumberOfClauses(outputs.length);
for (int i = 0; i < outputs.length; ++i) {
handleConstr(gateType[i], outputs[i], inputs[i]);
}
return solver;
}
public String decode(int[] model) {
StringBuffer stb = new StringBuffer(4 * model.length);
for (int i = 0; i < model.length; i++) {
stb.append(model[i]);
stb.append(" ");
}
stb.append("0");
return stb.toString();
}
protected ISolver getSolver() {
return solver;
}
}