Network Graph Refactoring: Northbound API cleanup
 * Renamed/shortened methods:
   Link.getSourcePort() -> getSrcPort()
   Link.getDestinationPort() -> getDstPort()
   Link.getSourceSwitch() -> getSrcSwitch()
   Link.getDestinationSwitch() -> getDstSwitch()

 * Added Javadoc comments

 * Removed deprecated and unused methods:
   Link.getSourceSwitchDpid()
   Link.getSorcePortNumber()
   Link.getDestinationSwitchDpid()
   Link.getDestinationPortNumber()
   NetworkGraph.getOutgoingLinksFromSwitch()
   NetworkGraph.getIncomingLinksFromSwitch()

 * Moved method LinkEvent.getLink(NetworkGraph graph)
   to NetworkGraph.getLink()

Change-Id: Ibedba53fc6cd04d77f508ee67d41b2cfa515d3fc
diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/LinkEvent.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/LinkEvent.java
index 83af786..d12e99c 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/LinkEvent.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/LinkEvent.java
@@ -29,10 +29,10 @@
     }
 
     public LinkEvent(Link link) {
-	src = new SwitchPort(link.getSourceSwitch().getDpid(),
-		link.getSourcePort().getNumber());
-	dst = new SwitchPort(link.getDestinationSwitch().getDpid(),
-		link.getDestinationPort().getNumber());
+	src = new SwitchPort(link.getSrcSwitch().getDpid(),
+		link.getSrcPort().getNumber());
+	dst = new SwitchPort(link.getDstSwitch().getDpid(),
+		link.getDstPort().getNumber());
     }
 
     public SwitchPort getSrc() {
@@ -62,16 +62,6 @@
 		dst.getDpid(), dst.getNumber());
     }
 
-    public Link getLink(NetworkGraph graph) {
-	Port srcPort = graph.getPort(getSrc().getDpid(), getSrc().getNumber());
-	if (srcPort == null) return null;
-	Link link = srcPort.getOutgoingLink();
-	if (link == null) return null;
-	if (link.getDestinationSwitch().getDpid() != getDst().getDpid()) return null;
-	if (link.getDestinationPort().getNumber() != getDst().getNumber()) return null;
-	return link;
-    }
-
     @Override
     public int hashCode() {
 	final int prime = 31;