[DL-Learner SVN] SF.net SVN: dl-learner:[3930] trunk/components-core/src/main/java/org/ dllearner/utilities/owl/OWLEntityTypeAdder.java

[<lor...@us...>]

Revision: 3930
          http://sourceforge.net/p/dl-learner/code/3930
Author:   lorenz_b
Date:     2013-04-30 11:06:03 +0000 (Tue, 30 Apr 2013)
Log Message:
-----------
Added class which fills JENA model with explicit type statements for entities.

Added Paths:
-----------
    trunk/components-core/src/main/java/org/dllearner/utilities/owl/OWLEntityTypeAdder.java

Added: trunk/components-core/src/main/java/org/dllearner/utilities/owl/OWLEntityTypeAdder.java
===================================================================
--- trunk/components-core/src/main/java/org/dllearner/utilities/owl/OWLEntityTypeAdder.java	                        (rev 0)
+++ trunk/components-core/src/main/java/org/dllearner/utilities/owl/OWLEntityTypeAdder.java	2013-04-30 11:06:03 UTC (rev 3930)
@@ -0,0 +1,50 @@
+package org.dllearner.utilities.owl;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import com.google.common.collect.Sets;
+import com.hp.hpl.jena.rdf.model.Model;
+import com.hp.hpl.jena.rdf.model.Property;
+import com.hp.hpl.jena.rdf.model.RDFNode;
+import com.hp.hpl.jena.rdf.model.Statement;
+import com.hp.hpl.jena.rdf.model.StmtIterator;
+import com.hp.hpl.jena.vocabulary.OWL;
+import com.hp.hpl.jena.vocabulary.RDF;
+import com.hp.hpl.jena.vocabulary.RDFS;
+
+public class OWLEntityTypeAdder {
+
+	/**
+	 * Infers the type of predicates p_i by analyzing the object of the triples using p_i and adds the
+	 * entity type assertion to the model, i.e. for a data property dp <dp a owl:DatatypeProperty>
+	 * will be added.
+	 * @param model
+	 */
+	public static void addEntityTypes(Model model){
+		StmtIterator iterator = model.listStatements();
+		Set<Property> objectPropertyPredicates = new HashSet<Property>();
+		Set<Property> dataPropertyPredicates = new HashSet<Property>();
+		while(iterator.hasNext()){
+			Statement st = iterator.next();
+			Property predicate = st.getPredicate();
+			if(!predicate.getURI().startsWith(RDF.getURI()) && !predicate.getURI().startsWith(RDFS.getURI())){
+				RDFNode object = st.getObject();
+				if(object.isLiteral()){
+					dataPropertyPredicates.add(predicate);
+				} else if(object.isResource()){
+					objectPropertyPredicates.add(predicate);
+				}
+			}
+		}
+		iterator.close();
+		
+		for (Property property : Sets.difference(objectPropertyPredicates, dataPropertyPredicates)) {
+			model.add(property, RDF.type, OWL.ObjectProperty);
+		}
+		for (Property property : Sets.difference(dataPropertyPredicates, objectPropertyPredicates)) {
+			model.add(property, RDF.type, OWL.DatatypeProperty);
+		}
+	}
+
+}

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