add another GraphDBOperation constructor which creates an instance directry from GraphDBConnection configuration path.
diff --git a/src/main/java/net/onrc/onos/util/GraphDBOperation.java b/src/main/java/net/onrc/onos/util/GraphDBOperation.java
index 858a17e..da41dbd 100644
--- a/src/main/java/net/onrc/onos/util/GraphDBOperation.java
+++ b/src/main/java/net/onrc/onos/util/GraphDBOperation.java
@@ -24,6 +24,10 @@
 	public GraphDBOperation(GraphDBConnection dbConnection) {
 		this.conn = dbConnection;
 	}
+	
+	public GraphDBOperation(final String dbConfPath) {
+		this.conn = GraphDBConnection.getInstance(dbConfPath);
+	}
 
 	@Override
 	public ISwitchObject newSwitch(String dpid) {