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.core.VecInt;
35 import org.sat4j.pb.IPBSolver;
36 import org.sat4j.reader.ParseFormatException;
37 import org.sat4j.specs.IVecInt;
38
39 /**
40 * @author anne
41 *
42 */
43 public class OPBEclipseReader2007 extends OPBReader2007 {
44
45 /**
46 *
47 */
48 private static final long serialVersionUID = 1L;
49
50 private final IVecInt varExplain = new VecInt();
51
52 /**
53 * @param solver
54 */
55 public OPBEclipseReader2007(IPBSolver solver) {
56 super(solver);
57 }
58
59 /**
60 * callback called before we read the list for variables explanation
61 */
62 protected void beginListOfVariables() {
63 }
64
65 /**
66 * callback called after we've read the list for variable explanation
67 */
68 protected void endListOfVariables() {
69 }
70
71 /**
72 * read the list for variables explanation (if any) calls
73 * beginListOfVariables and endListOfVariables
74 *
75 * @throws IOException
76 * @throws ParseException
77 */
78 @Override
79 protected void readVariablesExplanation() throws IOException,
80 ParseFormatException {
81 char c;
82 StringBuffer var = new StringBuffer();
83
84 // read variables line (if any)
85 // if the problem is unsatisfiable, and if these variables are part of
86 // the reason of the conflict
87 // then an explanation should be produced for these variables
88
89 skipSpaces();
90 c = get();
91 if (c != 'e') {
92 // no variables line
93 putback(c);
94 return;
95 }
96
97 this.hasVariablesExplanation = true;
98 if (get() == 'x' && get() == 'p' && get() == 'l' && get() == 'a'
99 && get() == 'i' && get() == 'n' && get() == ':') {
100 beginListOfVariables(); // callback
101
102 while (!eof()) {
103 readIdentifier(var);
104 this.varExplain.push(translateVarToId(var.toString()));
105
106 skipSpaces();
107 c = get();
108 if (c == ';') {
109 break; // end of list of variables
110 }
111 putback(c);
112 }
113
114 endListOfVariables();
115 } else {
116 throw new ParseFormatException(
117 "input format error: 'explain:' expected");
118 }
119
120 }
121
122 @Override
123 public IVecInt getListOfVariables() {
124 if (this.hasVariablesExplanation) {
125 IVecInt tmp = new VecInt();
126 this.varExplain.moveTo(tmp);
127 return tmp;
128 }
129 return null;
130 }
131
132 }