| 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.common; |
| 17 | |
| 18 | import java.util.ArrayList; |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.qedeq.base.utility.EqualsUtility; |
| 22 | import org.qedeq.kernel.se.base.list.Element; |
| 23 | import org.qedeq.kernel.se.base.list.ElementList; |
| 24 | import org.qedeq.kernel.se.common.ModuleContext; |
| 25 | |
| 26 | /** |
| 27 | * Function constant. |
| 28 | * |
| 29 | * @author Michael Meyling |
| 30 | */ |
| 31 | public final class FunctionConstant { |
| 32 | |
| 33 | /** Predicate key. */ |
| 34 | private final FunctionKey key; |
| 35 | |
| 36 | /** Complete formula. */ |
| 37 | private final ElementList completeFormula; |
| 38 | |
| 39 | /** In this context the function was defined. */ |
| 40 | private final ModuleContext context; |
| 41 | |
| 42 | /** Function with subject variables. */ |
| 43 | private final ElementList function; |
| 44 | |
| 45 | /** Defining term. */ |
| 46 | private final ElementList definingTerm; |
| 47 | |
| 48 | /** Parameter subject variables. */ |
| 49 | private final List subjectVariables; |
| 50 | |
| 51 | /** |
| 52 | * Constructor. |
| 53 | * |
| 54 | * @param key Function name. |
| 55 | * @param completeFormula Complete formula defining function. Includes function. |
| 56 | * Must be like: f(x, y) = {z | z \in x & z \in y} |
| 57 | * @param context Module context we are in. |
| 58 | */ |
| 59 | public FunctionConstant(final FunctionKey key, final ElementList completeFormula, |
| 60 | final ModuleContext context) { |
| 61 | this.key = key; |
| 62 | this.completeFormula = completeFormula; |
| 63 | this.context = new ModuleContext(context); // using copy constructor to fix context |
| 64 | final ElementList list = completeFormula.getList(); |
| 65 | function = list.getElement(1).getList(); |
| 66 | definingTerm = list.getElement(2).getList(); |
| 67 | subjectVariables = new ArrayList(function.size() - 1); |
| 68 | for (int i = 0; i < function.size() - 1; i++) { |
| 69 | subjectVariables.add(new SubjectVariable( |
| 70 | function.getElement(i + 1).getList().getElement(0).getAtom().getString())); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Get function key. |
| 76 | * |
| 77 | * @return Function key. |
| 78 | */ |
| 79 | public FunctionKey getKey() { |
| 80 | return key; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Get function name. |
| 85 | * |
| 86 | * @return Function name. |
| 87 | */ |
| 88 | public String getName() { |
| 89 | return key.getName(); |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Get function argument number. |
| 94 | * |
| 95 | * @return Number of arguments. |
| 96 | */ |
| 97 | public String getArguments() { |
| 98 | return key.getArguments(); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Get complete defining formula. Includes function itself. |
| 103 | * |
| 104 | * @return Complete defining formula. |
| 105 | */ |
| 106 | public Element getCompleteFormula() { |
| 107 | return completeFormula; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Get context where the complete formula is. |
| 112 | * |
| 113 | * @return Module context for complete formula. |
| 114 | */ |
| 115 | public ModuleContext getContext() { |
| 116 | return context; |
| 117 | } |
| 118 | /** |
| 119 | * Get function with parameters. |
| 120 | * |
| 121 | * @return Function term with subject variables. |
| 122 | */ |
| 123 | public ElementList getFunction() { |
| 124 | return function; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Get list of parameter subject variables. |
| 129 | * |
| 130 | * @return Parameter subject variables as a list. |
| 131 | */ |
| 132 | public List getSubjectVariables() { |
| 133 | return subjectVariables; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Get defining term. Function itself is not included. |
| 138 | * |
| 139 | * @return Defining term only. |
| 140 | */ |
| 141 | public Element getDefiningTerm() { |
| 142 | return definingTerm; |
| 143 | } |
| 144 | |
| 145 | public int hashCode() { |
| 146 | return (getKey() != null ? getKey().hashCode() : 0) |
| 147 | ^ (getCompleteFormula() != null ? getCompleteFormula().hashCode() : 0); |
| 148 | } |
| 149 | |
| 150 | public boolean equals(final Object obj) { |
| 151 | if (!(obj instanceof FunctionConstant)) { |
| 152 | return false; |
| 153 | } |
| 154 | final FunctionConstant other = (FunctionConstant) obj; |
| 155 | return EqualsUtility.equals(getKey(), other.getKey()) |
| 156 | && EqualsUtility.equals(getCompleteFormula(), other.getCompleteFormula()); |
| 157 | } |
| 158 | |
| 159 | public String toString() { |
| 160 | return getName() + "[" + getArguments() + "]"; |
| 161 | } |
| 162 | |
| 163 | |
| 164 | } |