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package uk.ac.ox.cs.rsacomb
/* Java imports */
import java.io.File
import java.util.HashMap
import scala.collection.JavaConverters._
import tech.oxfordsemantic.jrdfox.client.UpdateType
import tech.oxfordsemantic.jrdfox.logic.sparql.statement.SelectQuery
import tech.oxfordsemantic.jrdfox.logic.expression.{IRI, Term}
/* Local imports */
import util.{RDFoxHelpers, RSA}
object RSAComb extends App {
val help: String = """
rsacomb - combined approach for CQ answering for RSA ontologies.
USAGE
rsacomb <path/to/ontology.owl> <path/to/query.sparql>
where
the ontology is expected to be an OWL file and the (single)
query a SPARQL query file.
"""
/* Simple arguments handling
*
* TODO: use something better later on
*/
if (args.length < 2) {
println(help)
sys.exit;
}
val ontoPath = new File(args(0))
val queryPath = new File(args(1))
if (!ontoPath.isFile || !queryPath.isFile) {
println("The provided arguments are not regular files.\n\n")
println(help)
sys.exit;
}
/* Create RSA object from generic OWLOntology
*
* TODO: It might be required to check if the ontology in input is
* Horn-ALCHOIQ. At the moment we are assuming this is always the
* case.
*/
val ontology = RSAOntology(ontoPath)
if (ontology.isRSA) {
/* Load query */
val query = RDFoxHelpers.parseSelectQuery(
"""
PREFIX : <http://example.com/rsa_example.owl#>
SELECT ?X
WHERE {
?X a :D ;
:R ?Y .
?Y :S ?Z .
?Z a :D .
}
"""
)
/* Compute answers to query */
query match {
case Some(query) => {
import implicits.JavaCollections._
// Open connection to RDFox
val (server, data) = RDFoxHelpers.openConnection("AnswerComputation")
{
println("\nQuery")
println(query)
}
// Step 1. Computing the canonical model
val canon = ontology.canonicalModel
data.addRules(canon.rules)
{
println("\nCanonical Model rules:")
canon.rules.foreach(println)
}
// Step 2. Computing the canonical model
val nis = {
val query = "SELECT ?Y WHERE { ?X rsa:EquivTo ?Y ; a rsa:Named . }"
RDFoxHelpers.submitSelectQuery(data, query, RSA.Prefixes).flatten
}
val filter = ontology.filteringProgram(query, nis)
data.addRules(filter.rules)
{
println("\nFiltering rules")
filter.rules.foreach(println)
}
// Retrieve answers
println("\nAnswers:")
val ans =
RDFoxHelpers.queryInternalPredicate(data, "Ans", filter.answer.length)
println(ans)
/* DEBUG: adding additional checks
*/
{
import suffix.{Forward, Backward}
val arity = filter.answer.length + filter.bounded.length
println("\nIndividuals:")
ontology.individuals.foreach(println)
println("\nThings:")
val things = RDFoxHelpers.submitSelectQuery(
data,
"""
PREFIX owl: <http://www.w3.org/2002/07/owl#>
SELECT ?X {
?X a owl:Thing
}
"""
)
println(things)
println("\nNAMEDs:")
val named = RDFoxHelpers.submitSelectQuery(
data,
"""
SELECT ?X {
?X a rsa:Named
}
""",
RSA.Prefixes
)
println(named)
println("\nNIs:")
val nis = RDFoxHelpers.submitSelectQuery(
data,
"""
SELECT ?X {
?X a rsa:NI
}
""",
RSA.Prefixes
)
println(nis)
// ID instances
println("\nIDs:")
val ids = RDFoxHelpers.queryInternalPredicate(
data,
"ID",
arity + 2
)
println(ids)
println("\nEquivTo:")
val equivs = RDFoxHelpers.submitSelectQuery(
data,
"""
SELECT ?X ?Y {
?X rsa:EquivTo ?Y
}
""",
RSA.Prefixes
)
println(equivs)
// Unfiltered answers
println("\nPossible answers:")
val qms = RDFoxHelpers.queryInternalPredicate(
data,
"QM",
arity
)
println(qms)
// Cycle detected
println("\nCycle detection:")
val aqf = RDFoxHelpers.queryInternalPredicate(
data,
"AQ" :: Forward,
arity + 2
)
val aqb = RDFoxHelpers.queryInternalPredicate(
data,
"AQ" :: Backward,
arity + 2
)
println(aqf)
println(aqb)
// Forks detected
println("\nForks:")
val fk = RDFoxHelpers.queryInternalPredicate(
data,
"FK",
arity
)
println(fk)
// Spurious answers
println("\nSpurious answers")
val sp = RDFoxHelpers.queryInternalPredicate(
data,
"SP",
arity
)
println(sp)
}
// Close connection to RDFox
RDFoxHelpers.closeConnection(server, data)
}
case None => {}
}
}
}
/* Notes:
*
* To establish a connection with a local RDFox instance, do the
* following:
*
* ```
* val serverConnection : ServerConnection = ConnectionFactory.newServerConnection("rdfox:local", "", "")
* serverConnection.createDataStore("test","seq",new HashMap())
* val dataStoreConnection : DataStoreConnection = serverConnection.newDataStoreConnection("test")
* dataStoreConnection.importData(
* UpdateType.ADDITION,
* Prefixes.s_emptyPrefixes,
* new File("./path/to/file")
* )
* ```
*/
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