servlet context listener for NIHVIVO-205 ontology upgrade

webapp/src/edu/cornell/mannlib/vitro/webapp/servlet/setup/UpdateKnowledgeBase.java

@@ -0,0 +1,44 @@
+/* $This file is distributed under the terms of the license in /doc/license.txt$ */
+
+package edu.cornell.mannlib.vitro.webapp.servlet.setup;
+
+import java.io.IOException;
+
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+
+import com.hp.hpl.jena.ontology.OntModel;
+
+import edu.cornell.mannlib.vitro.webapp.dao.jena.JenaBaseDao;
+import edu.cornell.mannlib.vitro.webapp.dao.jena.OntModelSelector;
+import edu.cornell.mannlib.vitro.webapp.dao.jena.SimpleOntModelSelector;
+import edu.cornell.mannlib.vitro.webapp.ontology.update.OntologyUpdater;
+
+/**
+ * Invokes process to test whether the knowledge base needs any updating
+ * to align with ontology changes.
+ * @author bjl23
+ *
+ */
+public class UpdateKnowledgeBase implements ServletContextListener {
+
+	public void contextInitialized(ServletContextEvent sce) {
+		
+		OntModelSelector oms = new SimpleOntModelSelector(
+				(OntModel) sce.getServletContext().getAttribute(
+						JenaBaseDao.ASSERTIONS_ONT_MODEL_ATTRIBUTE_NAME));
+		
+		try {
+			(new OntologyUpdater(sce.getServletContext(), oms)).update(); 
+		} catch (IOException ioe) {
+			throw new RuntimeException("IOException updating knowledge base " +
+					"for ontology changes", ioe);
+		}
+		
+	}	
+	
+	public void contextDestroyed(ServletContextEvent arg0) {
+		// nothing to do	
+	}
+
+}