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1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org | |
2 | * | |
3 | * Copyright 2000-2013, 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.se.base.module; | |
17 | ||
18 | ||
19 | /** | |
20 | * Marker interface for different node types. Might be a definition or theorem or else. | |
21 | * | |
22 | * TODO mime 20050707: an interface must not know its implementations. This one does! This was | |
23 | * necessary as a quick hack to get some information in QedeqBoFactory and Context2XPath. | |
24 | * mime 20051216 I still see no solution to get round this. Some JUnit tests work against | |
25 | * this interface and get no information about the instance. | |
26 | * | |
27 | * @author Michael Meyling | |
28 | */ | |
29 | public interface NodeType { | |
30 | ||
31 | /** | |
32 | * Get axiom, if this is an instance of {@link Axiom}. | |
33 | * | |
34 | * @return Axiom, maybe <code>null</code>. | |
35 | */ | |
36 | public Axiom getAxiom(); | |
37 | ||
38 | /** | |
39 | * Get definition, if this is an instance of {@link PredicateDefinition}. | |
40 | * | |
41 | * @return Definition, maybe <code>null</code>. | |
42 | */ | |
43 | public PredicateDefinition getPredicateDefinition(); | |
44 | ||
45 | /** | |
46 | * Get initial definition, if this is an instance of {@link InitialPredicateDefinition}. | |
47 | * | |
48 | * @return Definition, maybe <code>null</code>. | |
49 | */ | |
50 | public InitialPredicateDefinition getInitialPredicateDefinition(); | |
51 | ||
52 | /** | |
53 | * Get definition, if this is an instance of {@link InitialFunctionDefinition}. | |
54 | * | |
55 | * @return Definition, maybe <code>null</code>. | |
56 | */ | |
57 | public InitialFunctionDefinition getInitialFunctionDefinition(); | |
58 | ||
59 | /** | |
60 | * Get definition, if this is an instance of {@link FunctionDefinition}. | |
61 | * | |
62 | * @return Definition, maybe <code>null</code>. | |
63 | */ | |
64 | public FunctionDefinition getFunctionDefinition(); | |
65 | ||
66 | /** | |
67 | * Get proposition, if this is an instance of {@link Proposition}. | |
68 | * | |
69 | * @return Proposition, maybe <code>null</code>. | |
70 | */ | |
71 | public Proposition getProposition(); | |
72 | ||
73 | /** | |
74 | * Get rule, if this is an instance of {@link Rule}. | |
75 | * | |
76 | * @return Rule, maybe <code>null</code>. | |
77 | */ | |
78 | public Rule getRule(); | |
79 | ||
80 | } |
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