01: package org.mandarax.reference;
02:
03: /*
04: * Copyright (C) 1999-2004 <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</a>
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20:
21: import org.mandarax.kernel.*;
22:
23: /**
24: * Semantic evaluation policy that switches semantic evaluation off.
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 2.0
28: */
29: public class NoSemanticEvaluationPolicy implements
30: SemanticEvaluationPolicy {
31:
32: /**
33: * Try to execute literals in the clause - accourding to this policy, just do nothing.
34: * @param c a clause
35: * @param session a session
36: * @param logOn indicates whether we should log
37: * @return another clause
38: */
39: public Clause evaluate(Clause c, Session session, boolean logOn) {
40: return c;
41: }
42:
43: /**
44: * Try to evaluate (simplify) a complex term.
45: * @param ct a complex term
46: * @param cs the clause set (context object)
47: * @param session a session
48: * @param logOn indicates whether we should log
49: * @return a term
50: */
51: public Term evaluate(ComplexTerm ct, ClauseSet cs, Session session,
52: boolean logOn) {
53:
54: return ct;
55: }
56:
57: /**
58: * Try to unify two terms by evaluating them and comparing the results.
59: * @param t1 the first term
60: * @param t2 the second term
61: * @param session a session
62: * @param logOn indicates whether we should log
63: * @return a boolean - true if the terms represent the same object
64: */
65: public boolean evaluateAndCompare(Term t1, Term t2,
66: Session session, boolean logOn) {
67:
68: return false;
69: }
70:
71: }
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