[29] | 1 | /* |
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| 2 | * This program is free software; you can redistribute it and/or modify |
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| 3 | * it under the terms of the GNU General Public License as published by |
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| 4 | * the Free Software Foundation; either version 2 of the License, or |
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| 5 | * (at your option) any later version. |
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| 6 | * |
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| 7 | * This program is distributed in the hope that it will be useful, |
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| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 10 | * GNU General Public License for more details. |
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| 11 | * |
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| 12 | * You should have received a copy of the GNU General Public License |
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| 13 | * along with this program; if not, write to the Free Software |
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| 14 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 15 | */ |
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| 16 | |
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| 17 | /* |
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| 18 | * Literal.java |
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| 19 | * Copyright (C) 2003 Peter A. Flach, Nicolas Lachiche |
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| 20 | * |
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| 21 | * Thanks to Amelie Deltour for porting the original C code to Java |
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| 22 | * and integrating it into Weka. |
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| 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | package weka.associations.tertius; |
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| 27 | |
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| 28 | import weka.core.Instance; |
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| 29 | import weka.core.RevisionHandler; |
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| 30 | |
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| 31 | import java.io.Serializable; |
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| 32 | |
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| 33 | /** |
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| 34 | * @author Peter A. Flach |
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| 35 | * @author Nicolas Lachiche |
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| 36 | * @version $Revision: 1.5 $ |
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| 37 | */ |
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| 38 | public abstract class Literal |
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| 39 | implements Serializable, RevisionHandler { |
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| 40 | |
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| 41 | /** for serialization */ |
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| 42 | private static final long serialVersionUID = 2675363669503575771L; |
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| 43 | |
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| 44 | private Predicate m_predicate; |
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| 45 | |
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| 46 | public static final int NEG = 0; |
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| 47 | |
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| 48 | public static final int POS = 1; |
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| 49 | |
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| 50 | private int m_sign; |
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| 51 | |
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| 52 | private Literal m_negation; |
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| 53 | |
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| 54 | protected int m_missing; |
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| 55 | |
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| 56 | public Literal(Predicate predicate, int sign, int missing) { |
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| 57 | |
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| 58 | m_predicate = predicate; |
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| 59 | m_sign = sign; |
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| 60 | m_negation = null; |
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| 61 | m_missing = missing; |
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| 62 | } |
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| 63 | |
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| 64 | public Predicate getPredicate() { |
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| 65 | |
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| 66 | return m_predicate; |
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| 67 | } |
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| 68 | |
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| 69 | public Literal getNegation() { |
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| 70 | |
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| 71 | return m_negation; |
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| 72 | } |
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| 73 | |
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| 74 | public void setNegation(Literal negation) { |
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| 75 | |
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| 76 | m_negation = negation; |
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| 77 | } |
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| 78 | |
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| 79 | public boolean positive() { |
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| 80 | |
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| 81 | return m_sign == POS; |
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| 82 | } |
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| 83 | |
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| 84 | public boolean negative() { |
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| 85 | |
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| 86 | return m_sign == NEG; |
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| 87 | } |
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| 88 | |
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| 89 | public abstract boolean satisfies(Instance instance); |
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| 90 | |
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| 91 | public abstract boolean negationSatisfies(Instance instance); |
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| 92 | |
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| 93 | public abstract String toString(); |
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| 94 | } |
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| 95 | |
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| 96 | |
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| 97 | |
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| 98 | |
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| 99 | |
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| 100 | |
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