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: /**
21: * A trivial iterator for an emty clause set.
22: * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
23: * @version 3.4 <7 March 05>
24: * @since 1.2
25: */
26: public final class ZeroClauseIterator extends AbstractClauseIterator {
27:
28: /**
29: * Constructor.
30: */
31: public ZeroClauseIterator() {
32: super ();
33: }
34:
35: /**
36: * Indicates whether there are more clauses.
37: * @return true if there are more clauses, false otherwise
38: */
39: public boolean hasMoreClauses() {
40: return false;
41: }
42:
43: /**
44: * Get the next clause.
45: * @return the next clause
46: */
47: public org.mandarax.kernel.Clause nextClause() {
48: return null;
49: }
50: }
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