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authorFederico Igne <federico.igne@cs.ox.ac.uk>2020-08-04 11:11:57 +0100
committerFederico Igne <federico.igne@cs.ox.ac.uk>2020-08-04 11:11:57 +0100
commite8518528a77edf6a28449a57bd96048a6232a5db (patch)
tree1dca0e5f8cb1b465e85096f4e5699dd75e77b0f0 /src/main/scala/rsacomb/RDFoxClassExprConverter.scala
parent88597503975804e3cb83d116f3cc9a3f12c57461 (diff)
downloadRSAComb-e8518528a77edf6a28449a57bd96048a6232a5db.tar.gz
RSAComb-e8518528a77edf6a28449a57bd96048a6232a5db.zip
Adapt LP conversion to RSA check
Part of the process involves the search of unsafe roles in the input ontology. This is still to be implemented and for now the set of unsafe roles for the testing example is hardcoded.
Diffstat (limited to 'src/main/scala/rsacomb/RDFoxClassExprConverter.scala')
-rw-r--r--src/main/scala/rsacomb/RDFoxClassExprConverter.scala46
1 files changed, 30 insertions, 16 deletions
diff --git a/src/main/scala/rsacomb/RDFoxClassExprConverter.scala b/src/main/scala/rsacomb/RDFoxClassExprConverter.scala
index 58bee44..227c25b 100644
--- a/src/main/scala/rsacomb/RDFoxClassExprConverter.scala
+++ b/src/main/scala/rsacomb/RDFoxClassExprConverter.scala
@@ -10,14 +10,17 @@ import tech.oxfordsemantic.jrdfox.logic.{Atom, Term, Variable, Literal, Datatype
10 10
11import rsacomb.SkolemStrategy 11import rsacomb.SkolemStrategy
12import rsacomb.RDFoxRuleShards 12import rsacomb.RDFoxRuleShards
13import org.semanticweb.owlapi.model.OWLObjectPropertyExpression
14import org.semanticweb.owlapi.model.OWLObjectProperty
13 15
14object RDFoxClassExprConverter { 16object RDFoxClassExprConverter {
15 17
16 def apply(term : Term, skolem : SkolemStrategy) : RDFoxClassExprConverter = 18 def apply(
17 new RDFoxClassExprConverter(term, skolem) 19 term : Term = Variable.create("x"),
18 20 skolem : SkolemStrategy = SkolemStrategy.None,
19 def apply(term : Term) : RDFoxClassExprConverter = 21 unsafe : List[OWLObjectPropertyExpression] = List()
20 new RDFoxClassExprConverter(term, SkolemStrategy.None) 22 ) : RDFoxClassExprConverter =
23 new RDFoxClassExprConverter(term, skolem, unsafe)
21 24
22 def merge(rules : List[RDFoxRuleShards]) : RDFoxRuleShards = { 25 def merge(rules : List[RDFoxRuleShards]) : RDFoxRuleShards = {
23 rules.foldLeft(RDFoxRuleShards(List(),List())) { 26 rules.foldLeft(RDFoxRuleShards(List(),List())) {
@@ -31,7 +34,7 @@ object RDFoxClassExprConverter {
31 34
32} // object RDFoxClassExprConverter 35} // object RDFoxClassExprConverter
33 36
34class RDFoxClassExprConverter(term : Term, skolem : SkolemStrategy) 37class RDFoxClassExprConverter(term : Term, skolem : SkolemStrategy, unsafe : List[OWLObjectPropertyExpression])
35 extends OWLClassExpressionVisitorEx[RDFoxRuleShards] 38 extends OWLClassExpressionVisitorEx[RDFoxRuleShards]
36{ 39{
37 40
@@ -46,7 +49,7 @@ class RDFoxClassExprConverter(term : Term, skolem : SkolemStrategy)
46 // OWLObjectIntersectionOf 49 // OWLObjectIntersectionOf
47 override 50 override
48 def visit(expr : OWLObjectIntersectionOf) : RDFoxRuleShards = { 51 def visit(expr : OWLObjectIntersectionOf) : RDFoxRuleShards = {
49 val visitor = new RDFoxClassExprConverter(term,skolem) 52 val visitor = new RDFoxClassExprConverter(term, skolem, unsafe)
50 // TODO: maybe using `flatMap` instead of `merge` + `map` works as well 53 // TODO: maybe using `flatMap` instead of `merge` + `map` works as well
51 RDFoxClassExprConverter.merge ( 54 RDFoxClassExprConverter.merge (
52 expr.asConjunctSet.asScala.toList 55 expr.asConjunctSet.asScala.toList
@@ -75,22 +78,33 @@ class RDFoxClassExprConverter(term : Term, skolem : SkolemStrategy)
75 // TODO: variables needs to be handled at visitor level. Hardcoding 78 // TODO: variables needs to be handled at visitor level. Hardcoding
76 // the name of the varibles might lead to errors for complex cases. 79 // the name of the varibles might lead to errors for complex cases.
77 val y = Variable.create("y") 80 val y = Variable.create("y")
78 val (fun,term1) = skolem match { 81 val prop = expr.getProperty()
79 case SkolemStrategy.None => (List(),y) 82 // Computes the result of rule skolemization. Depending on the used
80 case SkolemStrategy.Constant(c) => (List(), Literal.create(c, Datatype.IRI_REFERENCE)) 83 // technique it might involve the introduction of additional atoms,
84 // and/or fresh constants and variables.
85 val (head, body, term1) = skolem match {
86 case SkolemStrategy.None => (List(), List(), y)
87 case SkolemStrategy.Constant(c) => (List(), List(), Literal.create(c, Datatype.IRI_REFERENCE))
88 case SkolemStrategy.ConstantRSA(c) => {
89 val lit = Literal.create(c, Datatype.IRI_REFERENCE)
90 if (unsafe.contains(prop))
91 (List(Atom.create(TupleTableName.create("internal:PE"),term,lit), Atom.create(TupleTableName.create("internal:U"),lit)), List(), lit)
92 else
93 (List(), List(), lit)
94 }
81 case SkolemStrategy.Standard(f) => 95 case SkolemStrategy.Standard(f) =>
82 // At the time of writing the RDFox library does not have a 96 // At the time of writing the RDFox library does not have a
83 // particular class for the "SKOLEM" operator and it is instead 97 // particular class for the "SKOLEM" operator and it is instead
84 // a simple builtin function with a special name. 98 // a simple builtin function with a "special" name.
85 (List(BindAtom.create(BuiltinFunctionCall.create("SKOLEM",term),y)),y) 99 (List(),List(BindAtom.create(BuiltinFunctionCall.create("SKOLEM",term),y)),y)
86 } 100 }
87 val classVisitor = new RDFoxClassExprConverter(term1,skolem) 101 val classVisitor = new RDFoxClassExprConverter(term1, skolem, unsafe)
88 val classResult = expr.getFiller.accept(classVisitor) 102 val classResult = expr.getFiller.accept(classVisitor)
89 val propertyVisitor = new RDFoxPropertyExprConverter(term, term1, skolem) 103 val propertyVisitor = new RDFoxPropertyExprConverter(term, term1, skolem)
90 val propertyResult = expr.getProperty.accept(propertyVisitor) 104 val propertyResult = expr.getProperty.accept(propertyVisitor)
91 RDFoxRuleShards( 105 RDFoxRuleShards(
92 classResult.res ++ propertyResult, 106 classResult.res ++ propertyResult ++ head,
93 fun ++ classResult.ext 107 classResult.ext ++ body
94 ) 108 )
95 } 109 }
96 110
@@ -100,7 +114,7 @@ class RDFoxClassExprConverter(term : Term, skolem : SkolemStrategy)
100 // TODO: again, no hardcoded variables 114 // TODO: again, no hardcoded variables
101 val vars = List(Variable.create("y"),Variable.create("z")) 115 val vars = List(Variable.create("y"),Variable.create("z"))
102 val classResult = RDFoxClassExprConverter.merge( 116 val classResult = RDFoxClassExprConverter.merge(
103 vars.map(new RDFoxClassExprConverter(_,skolem)) 117 vars.map(new RDFoxClassExprConverter(_,skolem, unsafe))
104 .map(expr.getFiller.accept(_)) 118 .map(expr.getFiller.accept(_))
105 ) 119 )
106 val propertyResult = 120 val propertyResult =