01: package org.mandarax.kernel;
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: /**
22: * Interface for prerequisites used in the bodies of rules.
23: * @see org.mandarax.kernel.Rule
24: * @see org.mandarax.kernel.LogicFactory
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: * [Prova] Re-integration modifications
29: * @author <A HREF="mailto:a.kozlenkov@city.ac.uk">Alex Kozlenkov</A>
30: * @version 3.4 <7 March 05>
31: */
32: public interface Prerequisite extends Fact {
33:
34: /**
35: * Set the negated (as failure) flag.
36: * @param value true or false
37: */
38: void setNegatedAF(boolean value);
39:
40: /**
41: *
42: * @return Object
43: */
44: public Object getExtra();
45:
46: /**
47: *
48: * @param _cutPredicate Object
49: */
50: public void setExtra(Object _cutPredicate);
51: }
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