Allow access to underlying DataSource for extensibility

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@608008 13f79535-47bb-0310-9956-ffa450edef68

openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/kernel/JDBCStoreManager.java

@@ -216,6 +216,10 @@ public class JDBCStoreManager
         return _conn;
     }
     
+    protected DataSource getDataSource() {
+    	return _ds;
+    }
+
     public boolean exists(OpenJPAStateManager sm, Object context) {
         // add where conditions on base class to avoid joins if subclass
         // doesn't use oid as identifier