/*******************************************************************************
* 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.reader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.StringTokenizer;
import org.sat4j.core.VecInt;
import org.sat4j.specs.ContradictionException;
import org.sat4j.specs.ISolver;
import org.sat4j.specs.IVecInt;
/**
* A reader for cardinality contraints.
*
* @author leberre
*/
@Deprecated
public class CardDimacsReader extends DimacsReader {
/**
*
*/
private static final long serialVersionUID = 3258130241376368435L;
public CardDimacsReader(ISolver solver) {
super(solver);
}
/**
* @param in
* the input stream
* @throws IOException
* iff an IO problems occurs
* @throws ParseFormatException
* if the input stream does not comply with the DIMACS format.
* @throws ContradictionException
* si le probl?me est trivialement inconsistant.
*/
@Override
protected void readConstrs(LineNumberReader in) throws IOException,
ParseFormatException, ContradictionException {
int lit;
String line;
StringTokenizer stk;
int realNbOfClauses = 0;
IVecInt literals = new VecInt();
while (true) {
line = in.readLine();
if (line == null) {
// end of file
if (literals.size() > 0) {
// no 0 end the last clause
solver.addClause(literals);
realNbOfClauses++;
}
break;
}
if (line.startsWith("c ")) {
// skip commented line
continue;
}
if (line.startsWith("%") && expectedNbOfConstr == realNbOfClauses) {
System.out
.println("Ignoring the rest of the file (SATLIB format");
break;
}
stk = new StringTokenizer(line);
String token;
while (stk.hasMoreTokens()) {
// on lit le prochain token
token = stk.nextToken();
if ("<=".equals(token) || ">=".equals(token)) {
// on est sur une contrainte de cardinalit?
readCardinalityConstr(token, stk, literals);
literals.clear();
realNbOfClauses++;
} else {
lit = Integer.parseInt(token);
if (lit == 0) {
if (literals.size() > 0) {
solver.addClause(literals);
literals.clear();
realNbOfClauses++;
}
} else {
literals.push(lit);
}
}
}
}
if (expectedNbOfConstr != realNbOfClauses) {
throw new ParseFormatException("wrong nbclauses parameter. Found "
+ realNbOfClauses + ", " + expectedNbOfConstr + " expected");
}
}
private void readCardinalityConstr(String token, StringTokenizer stk,
IVecInt literals) throws ContradictionException,
ParseFormatException {
int card = Integer.parseInt(stk.nextToken());
int lit = Integer.parseInt(stk.nextToken());
if (lit == 0) {
if ("<=".equals(token)) {
solver.addAtMost(literals, card);
} else if (">=".equals(token)) {
solver.addAtLeast(literals, card);
}
} else
throw new ParseFormatException();
}
}