1 /*******************************************************************************
2 * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2008 Daniel Le Berre
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 *******************************************************************************/
28 package org.sat4j.tools;
29
30 import java.util.Iterator;
31
32 import org.sat4j.core.Vec;
33 import org.sat4j.specs.IConstr;
34 import org.sat4j.specs.ISolver;
35 import org.sat4j.specs.IVec;
36
37 /**
38 * A utility class used to manage easily group of clauses to be deleted at some
39 * point in the solver.
40 *
41 * @author dlb
42 * @since 2.0
43 *
44 */
45 public class ConstrGroup {
46
47 private final IVec<IConstr> constrs = new Vec<IConstr>();
48
49 public void add(IConstr constr) {
50 if (constr == null) {
51 throw new IllegalArgumentException("The constraint you entered cannot be removed from the solver.");
52 }
53 constrs.push(constr);
54 }
55
56 public void clear() {
57 constrs.clear();
58 }
59
60 public void removeFrom(ISolver solver) {
61 for (Iterator<IConstr> it = constrs.iterator(); it.hasNext();) {
62 solver.removeConstr(it.next());
63 }
64 }
65 }