1 /*
2 wsmo4j - a WSMO API and Reference Implementation
3 Copyright (c) 2005 University of Innsbruck, Austria
4 2005 National University of Ireland, Galway
5 This library is free software; you can redistribute it and/or modify it under
6 the terms of the GNU Lesser General Public License as published by the Free
7 Software Foundation; either version 2.1 of the License, or (at your option)
8 any later version.
9 This library is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12 details.
13 You should have received a copy of the GNU Lesser General Public License along
14 with this library; if not, write to the Free Software Foundation, Inc.,
15 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18 package org.deri.wsmo4j.logicalexpression;
19
20
21 import java.util.*;
22
23 import org.deri.wsmo4j.logicalexpression.util.*;
24 import org.omwg.logicalexpression.*;
25 import org.omwg.ontology.*;
26
27
28 /**
29 * @author DERI Innsbruck, reto.krummenacher@deri.org
30 * @author DERI Innsbruck, thomas.haselwanter@deri.org
31 */
32 public class UniversalQuantificationImpl
33 extends QuantifiedImpl
34 implements
35 UniversalQuantification {
36
37 public UniversalQuantificationImpl(Variable variable, LogicalExpression expr)
38 throws IllegalArgumentException {
39 this(SetUtil.createSet(variable), expr);
40 }
41
42 public UniversalQuantificationImpl(Set <Variable> variables, LogicalExpression expr)
43 throws IllegalArgumentException {
44 super(variables, expr);
45 }
46
47 public void accept(Visitor v) {
48 v.visitUniversalQuantification(this);
49 }
50
51 /**
52 * <p>
53 * The <code>equals</code> method implements an equivalence relation
54 * on non-null object references. Quantified expressions are equal if their operator,
55 * their logical expresssion and their set of variables are equal.
56 * </p>
57 * <p>
58 * It is generally necessary to override the <code>hashCode</code> method whenever this method
59 * is overridden.
60 * </p>
61 * @param o the reference object with which to compare.
62 * @return <code>true</code> if this object is the same as the obj
63 * argument; <code>false</code> otherwise.
64 * @see java.lang.Object#equals(java.lang.Object)
65 * @see java.lang.Object#hashCode()
66 */
67 public boolean equals(Object o) {
68 if (o instanceof UniversalQuantification) {
69 UniversalQuantification q = (UniversalQuantification)o;
70 if (!variables.equals(q.listVariables())) {
71 return false;
72 }
73 return expr.equals(q.getOperand());
74 }
75 return false;
76 }
77 }