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The pb library contains algorithms for solving pseudo boolean optimization problems.
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/*******************************************************************************
* 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 pseudo boolean algorithms described in:
* A fast pseudo-Boolean constraint solver Chai, D.; Kuehlmann, A.
* Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on
* Volume 24, Issue 3, March 2005 Page(s): 305 - 317
* 
* and 
* Heidi E. Dixon, 2004. Automating Pseudo-Boolean Inference within a DPLL 
* Framework. Ph.D. Dissertation, University of Oregon.
*******************************************************************************/
package org.sat4j.pb.reader;

import java.io.IOException;

import org.sat4j.pb.IPBSolver;
import org.sat4j.reader.ParseFormatException;

/**
 * Reader complying to the PB06 input format.
 * 
 * @author leberre
 * 
 */
public class OPBReader2006 extends OPBReader2005 {

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

    public OPBReader2006(IPBSolver solver) {
        super(solver);
    }

    /**
     * read a term into coeff and var
     * 
     * @param coeff
     *            the coefficient of the variable
     * @param var
     *            the indentifier we read
     * @throws IOException
     * @throws ParseException
     */
    @Override
    protected void readTerm(StringBuffer coeff, StringBuffer var)
            throws IOException, ParseFormatException {
        readInteger(coeff);

        skipSpaces();

        if (!readIdentifier(var))
            throw new ParseFormatException("identifier expected");
    }
}