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: import org.mandarax.kernel.Fact;
22:
23: /**
24: * Clause iterator for auto facts.
25: * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
26: * @version 3.4 <7 March 05>
27: * @since 1.2
28: */
29: class SingleAutoFactIterator extends AbstractAutoFactIterator {
30:
31: private Fact fact = null;
32: private boolean more = false;
33:
34: /**
35: * Constructor.
36: * @param f org.mandarax.kernel.Fact
37: * @param af the client object
38: */
39: public SingleAutoFactIterator(Fact f, AutoFacts af) {
40: super (af);
41: fact = f;
42: initialize();
43: }
44:
45: /**
46: * Indicates whether there are more clauses.
47: * @return boolean
48: */
49: public boolean hasMoreClauses() {
50: if (more) {
51: more = false;
52:
53: return true;
54: }
55: return more;
56: }
57:
58: /**
59: * Initialize the object.
60: */
61: private void initialize() {
62: more = perform(fact, null);
63: fact.setContainer(autofacts);
64: }
65:
66: /**
67: * Get the next clause.
68: */
69: public Clause nextClause() {
70: return fact;
71: }
72: }
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