01: /*
02: * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
03: *
04: * This library is free software; you can redistribute it and/or
05: * modify it under the terms of the GNU Lesser General Public
06: * License as published by the Free Software Foundation; either
07: * version 2 of the License, or (at your option) any later version.
08: *
09: * This library is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12: * Lesser General Public License for more details.
13: *
14: * You should have received a copy of the GNU Lesser General Public
15: * License along with this library; if not, write to the Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: */
18: package org.mandarax.util;
19:
20: import org.mandarax.kernel.Clause;
21:
22: /**
23: * Iterator for a single clause. The implementation is trivial!
24: * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
25: * @version 3.4 <7 March 05>
26: * @since 1.0
27: */
28: public class SingleClauseIterator extends AbstractClauseIterator {
29:
30: private boolean end = false;
31: private Clause clause = null;
32:
33: /**
34: * Constructor.
35: * @param a single clause
36: */
37: public SingleClauseIterator(Clause c) {
38: super ();
39: clause = c;
40: }
41:
42: /**
43: * Indicates whether there are more clauses.
44: * @return true if there are more clauses, false otherwise
45: */
46: public boolean hasMoreClauses() {
47: return !end;
48: }
49:
50: /**
51: * Get the next clause.
52: * @return the next clause
53: */
54: public org.mandarax.kernel.Clause nextClause() {
55: if (end) {
56: throw new java.util.NoSuchElementException(
57: "The single clause set iterator has only one element!");
58: } else {
59: end = true;
60: return clause;
61: }
62: }
63:
64: }
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