1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
3 *
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
8 *
9 * Alternatively, the contents of this file may be used under the terms of
10 * either the GNU Lesser General Public License Version 2.1 or later (the
11 * "LGPL"), in which case the provisions of the LGPL are applicable instead
12 * of those above. If you wish to allow use of your version of this file only
13 * under the terms of the LGPL, and not to allow others to use your version of
14 * this file under the terms of the EPL, indicate your decision by deleting
15 * the provisions above and replace them with the notice and other provisions
16 * required by the LGPL. If you do not delete the provisions above, a recipient
17 * may use your version of this file under the terms of the EPL or the LGPL.
18 *
19 * Based on the original MiniSat specification from:
20 *
21 * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22 * Sixth International Conference on Theory and Applications of Satisfiability
23 * Testing, LNCS 2919, pp 502-518, 2003.
24 *
25 * See www.minisat.se for the original solver in C++.
26 *
27 * Contributors:
28 * CRIL - initial API and implementation
29 *******************************************************************************/
30 package org.sat4j.pb.reader;
31
32 import java.io.IOException;
33
34 import org.sat4j.pb.IPBSolver;
35 import org.sat4j.pb.tools.LexicoDecoratorPB;
36 import org.sat4j.reader.ParseFormatException;
37 import org.sat4j.specs.ContradictionException;
38 import org.sat4j.specs.IProblem;
39
40 /**
41 * OPBReader allowing to read several objective functions in an OPB file.
42 *
43 * @since 2.3.3
44 */
45 public class OPBReader2012 extends OPBReader2010 {
46
47 private LexicoDecoratorPB lexico = null;
48
49 /**
50 *
51 */
52 private static final long serialVersionUID = 1L;
53
54 public OPBReader2012(IPBSolver solver) {
55 super(solver);
56 }
57
58 @Override
59 protected void readMetaData() throws IOException, ParseFormatException {
60 super.readMetaData();
61 skipSpaces();
62 char c = get();
63 if (c != '*') {
64 // no aggregation line
65 putback(c);
66 return;
67 }
68 skipSpaces();
69 String s = readWord();
70 if ("#aggregation=".equals(s)) {
71 s = readWord();
72 assert "lexico".equals(s);
73 lexico = new LexicoDecoratorPB(solver);
74 } else {
75 this.in.readLine();
76 get(); // remove trailing \n
77 }
78 }
79
80 @Override
81 protected void readObjective() throws IOException, ParseFormatException {
82 super.readObjective();
83 if (lexico != null && !lits.isEmpty()) {
84 lexico.addCriterion(lits, coeffs);
85 lits.clear();
86 coeffs.clear();
87 readObjective();
88 }
89 }
90
91 @Override
92 public IProblem parseInstance(final java.io.Reader input)
93 throws ParseFormatException, ContradictionException {
94 IProblem problem = super.parseInstance(input);
95 if (lexico != null) {
96 return lexico;
97 }
98 return problem;
99 }
100 }