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.kernel;
19:
20: /**
21: * Represents a logical derivation.
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 1.0
25: */
26: public class Derivation extends LObject {
27:
28: private DerivationNode root;
29: private int resultNumber = -1;
30:
31: /**
32: * Constructor. Pass the root.
33: * @param r the root node of the derivation
34: * @param resultNumber the result number (in a result set)
35: */
36: public Derivation(DerivationNode r, int resultNumber) {
37: super ();
38: root = r;
39: this .resultNumber = resultNumber;
40: }
41:
42: /**
43: * Get the root of a derivation.
44: * @return the root node of this derivation
45: */
46: public DerivationNode getRoot() {
47: return root;
48: }
49:
50: /**
51: * Get the number of the result in the result set this derivation represents.
52: * @return the result number
53: */
54: public int getResultNumber() {
55: return resultNumber;
56: }
57:
58: }
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