From 32fe8f94255b913c570275043a3c056eaa4ec07b Mon Sep 17 00:00:00 2001
From: Federico Igne <federico.igne@cs.ox.ac.uk>
Date: Wed, 11 May 2022 12:35:56 +0100
Subject: Implement stub for query answering procedure

---
 .../ac/ox/cs/acqua/reasoner/RSAQueryReasoner.scala | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/main/scala/uk/ac/ox/cs/acqua/reasoner/RSAQueryReasoner.scala

(limited to 'src/main/scala/uk/ac/ox/cs/acqua/reasoner')

diff --git a/src/main/scala/uk/ac/ox/cs/acqua/reasoner/RSAQueryReasoner.scala b/src/main/scala/uk/ac/ox/cs/acqua/reasoner/RSAQueryReasoner.scala
new file mode 100644
index 0000000..6b98d79
--- /dev/null
+++ b/src/main/scala/uk/ac/ox/cs/acqua/reasoner/RSAQueryReasoner.scala
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2021,2022 KRR Oxford
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package uk.ac.ox.cs.acqua.reasoner
+
+import org.semanticweb.owlapi.model.OWLOntology
+import uk.ac.ox.cs.rsacomb.RSAOntology
+import uk.ac.ox.cs.rsacomb.approximation.{Approximation,Lowerbound}
+import uk.ac.ox.cs.rsacomb.ontology.Ontology
+import uk.ac.ox.cs.pagoda.query.QueryRecord
+import uk.ac.ox.cs.pagoda.reasoner.QueryReasoner
+
+class RSAQueryReasoner(val origin: Ontology) extends QueryReasoner {
+
+  /* Implicit compatibility between PAGOdA and RSAComb types */
+  import uk.ac.ox.cs.acqua.implicits.PagodaConverters._
+
+  /** This class is instantiated when the input ontology is RSA.
+    * Approximation (via any algorithm with RSAOntology as target)
+    * doesn't perform anything, but is useful to turn a generic
+    * [[uk.ac.ox.cs.rsacomb.ontology.Ontology]] into an
+    * [[uk.ac.ox.cs.rsacomb.RSAOntology]].
+    */
+  private val toRSA: Approximation[RSAOntology] = new Lowerbound
+  val rsa: RSAOntology = origin approximate toRSA
+
+  /** Doesn't perform any action.
+    *
+    * @note Implemented for compatibility with other reasoners.
+   */
+  def loadOntology(ontology: OWLOntology): Unit = {
+    /* Nothing to do */
+  }
+
+  /** Check consistency and returns whether the ontology is RSA.
+    *
+    * Preprocessing is performed on instance creation, so no actual work
+    * is being done here.
+    *
+    * @note Implemented for compatibility with other reasoners.
+   */
+  def preprocess(): Boolean = {
+    origin.isRSA
+  }
+
+  /** Check consistency and returns whether the ontology is RSA.
+    *
+    * Preprocessing is performed on instance creation, along with
+    * consistency checking, so no actual work is being done here.
+    *
+    * @note Implemented for compatibility with other reasoners.
+   */
+  def isConsistent(): Boolean = {
+    origin.isRSA
+  }
+
+  // TODO: probably need to override `evaluate` on multiple queries
+  def evaluate(query: QueryRecord): Unit = {
+    rsa ask query
+  }
+
+  def evaluateUpper(record: QueryRecord): Unit= {
+    ???
+  }
+}
-- 
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