Github user meiercaleb commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/174#discussion_r126989163
--- Diff:
sail/src/main/java/org/apache/rya/rdftriplestore/inference/HasValueVisitor.java
---
@@ -0,0 +1,96 @@
+package org.apache.rya.rdftriplestore.inference;
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+
+import org.apache.rya.api.RdfCloudTripleStoreConfiguration;
+import org.apache.rya.api.utils.NullableStatementImpl;
+import org.apache.rya.rdftriplestore.utils.FixedStatementPattern;
+import org.openrdf.model.Resource;
+import org.openrdf.model.URI;
+import org.openrdf.model.Value;
+import org.openrdf.model.vocabulary.OWL;
+import org.openrdf.model.vocabulary.RDF;
+import org.openrdf.query.algebra.StatementPattern;
+import org.openrdf.query.algebra.TupleExpr;
+import org.openrdf.query.algebra.Var;
+
+public class HasValueVisitor extends AbstractInferVisitor {
+ public HasValueVisitor(RdfCloudTripleStoreConfiguration conf,
InferenceEngine inferenceEngine) {
+ super(conf, inferenceEngine);
+ include = true;
+ }
+
+ @Override
+ protected void meetSP(StatementPattern node) throws Exception {
+ final Var subjVar = node.getSubjectVar();
+ final Var predVar = node.getPredicateVar();
+ final Var objVar = node.getObjectVar();
+ // We can reason over two types of statement patterns:
+ // { ?var rdf:type :Restriction } and { ?var :property ?value }
+ // Both require defined predicate
+ if (predVar != null && predVar.getValue() != null) {
+ final URI predURI = (URI) predVar.getValue();
+ if (RDF.TYPE.equals(predURI) && objVar != null &&
objVar.getValue() != null
+ && objVar.getValue() instanceof Resource) {
+ // If the predicate is rdf:type and the type is specified,
check whether it can be
+ // inferred using any hasValue restriction(s)
+ final Resource objType = (Resource) objVar.getValue();
+ final Map<URI, Set<Value>> sufficientValues =
inferenceEngine.getHasValueByType(objType);
+ if (sufficientValues.size() > 0) {
+ final Var valueVar = new Var("v-" + UUID.randomUUID());
+ TupleExpr currentNode = node.clone();
+ for (URI property : sufficientValues.keySet()) {
+ final Var propVar = new Var(property.toString(),
property);
+ final TupleExpr valueSP = new
DoNotExpandSP(subjVar, propVar, valueVar);
+ final FixedStatementPattern relevantValues = new
FixedStatementPattern(objVar, propVar, valueVar);
+ for (Value value : sufficientValues.get(property))
{
+ relevantValues.statements.add(new
NullableStatementImpl(objType, property, value));
+ }
+ currentNode = new InferUnion(currentNode, new
InferJoin(relevantValues, valueSP));
+ }
+ node.replaceWith(currentNode);
+ }
+ }
+ else {
+ // If the predicate has some hasValue restriction
associated with it, then finding
+ // that the object belongs to the appropriate type implies
a value.
+ final Map<Resource, Set<Value>> impliedValues =
inferenceEngine.getHasValueByProperty(predURI);
--- End diff --
Are these all classes that have a hasValue property restriction on the
given predicate? Is the whole point here to check whether the class indicated
by objVar is a subClassOf of a Restriction that constrains the value of the
predicate?
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