1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
2 | * |
3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
4 | * |
5 | * "Hilbert II" is free software; you can redistribute |
6 | * it and/or modify it under the terms of the GNU General Public |
7 | * License as published by the Free Software Foundation; either |
8 | * version 2 of the License, or (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | */ |
15 | |
16 | package org.qedeq.kernel.bo.logic.model; |
17 | |
18 | import java.util.ArrayList; |
19 | import java.util.List; |
20 | |
21 | import org.qedeq.base.utility.Enumerator; |
22 | |
23 | |
24 | /** |
25 | * This class calculates a new truth value for a given formula for a given interpretation. |
26 | * |
27 | * @author Michael Meyling |
28 | */ |
29 | public final class PredicateVariableInterpreter { |
30 | |
31 | /** List of predicate variables. */ |
32 | private List predicateVariables; |
33 | |
34 | /** List of counters for predicate variables. */ |
35 | private List predicateVariableCounters; |
36 | |
37 | /** Model contains entities. */ |
38 | private Model model; |
39 | |
40 | /** |
41 | * Constructor. |
42 | * |
43 | * @param model Model we work on. |
44 | */ |
45 | public PredicateVariableInterpreter(final Model model) { |
46 | this.model = model; |
47 | predicateVariables = new ArrayList(); |
48 | predicateVariableCounters = new ArrayList(); |
49 | } |
50 | |
51 | private int getPredicateVariableSelection(final PredicateVariable var) { |
52 | int selection; |
53 | if (predicateVariables.contains(var)) { |
54 | final int index = predicateVariables.indexOf(var); |
55 | selection = ((Enumerator) predicateVariableCounters.get(index)).getNumber(); |
56 | } else { |
57 | // System.out.println("added predicate variable " + var); |
58 | selection = 0; |
59 | predicateVariables.add(var); |
60 | predicateVariableCounters.add(new Enumerator()); |
61 | } |
62 | return selection; |
63 | } |
64 | |
65 | /** |
66 | * Get model predicate for predicate variable. |
67 | * |
68 | * @param var For this predicate variable. |
69 | * @return Predicate for model. |
70 | */ |
71 | public Predicate getPredicate(final PredicateVariable var) { |
72 | return model.getPredicate(var.getArgumentNumber(), |
73 | getPredicateVariableSelection(var)); |
74 | } |
75 | |
76 | /** |
77 | * Change to next valuation. |
78 | * |
79 | * @return Is there a next new valuation? |
80 | */ |
81 | public boolean next() { |
82 | boolean next = true; |
83 | for (int i = predicateVariables.size() - 1; i >= -1; i--) { |
84 | if (i < 0) { |
85 | next = false; |
86 | break; |
87 | } |
88 | final PredicateVariable var = (PredicateVariable) predicateVariables.get(i); |
89 | final Enumerator number = (Enumerator) predicateVariableCounters.get(i); |
90 | if (number.getNumber() + 1 < model.getPredicateSize(var.getArgumentNumber())) { |
91 | number.increaseNumber(); |
92 | break; |
93 | } |
94 | number.reset(); |
95 | } |
96 | return next; |
97 | } |
98 | |
99 | public String toString() { |
100 | final StringBuffer buffer = new StringBuffer(); |
101 | buffer.append("predicate variables {"); |
102 | for (int i = 0; i < predicateVariables.size(); i++) { |
103 | if (i > 0) { |
104 | buffer.append(", "); |
105 | } |
106 | PredicateVariable var = (PredicateVariable) predicateVariables.get(i); |
107 | buffer.append(predicateVariables.get(i)); |
108 | buffer.append("="); |
109 | buffer.append(getPredicate(var)); |
110 | } |
111 | buffer.append("}"); |
112 | return buffer.toString(); |
113 | } |
114 | |
115 | /** |
116 | * Clear variable interpretation. |
117 | */ |
118 | public void clear() { |
119 | predicateVariables.clear(); |
120 | predicateVariableCounters.clear(); |
121 | } |
122 | |
123 | |
124 | } |