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/TopologyManager.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/TopologyManager.java
index 0275575..a01057b 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/TopologyManager.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/TopologyManager.java
@@ -417,10 +417,10 @@
 	    }
 	    log.debug("Removing Link {} on Port {}", link, portEvent);
 	    LinkEvent linkEvent =
-		new LinkEvent(link.getSourceSwitchDpid(),
-			      link.getSourcePortNumber(),
-			      link.getDestinationSwitchDpid(),
-			      link.getDestinationPortNumber());
+		new LinkEvent(link.getSrcSwitch().getDpid(),
+			      link.getSrcPort().getNumber(),
+			      link.getDstSwitch().getDpid(),
+			      link.getDstPort().getNumber());
 	    // calling Discovery API to wipe from DB, etc.
 
 	    // Call internal remove Link, which will check
@@ -480,8 +480,8 @@
 	// XXX Check if we should reject or just accept these cases.
 	// it should be harmless to remove the Link on event from DB anyways
 	if (link == null ||
-	    !link.getDestinationPortNumber().equals(linkEvent.getDst().number)
-	    || !link.getDestinationSwitchDpid().equals(linkEvent.getDst().dpid)) {
+	    !link.getDstPort().getNumber().equals(linkEvent.getDst().number)
+	    || !link.getDstSwitch().getDpid().equals(linkEvent.getDst().dpid)) {
 	    log.warn("Dropping remove link event because link doesn't exist: {}", linkEvent);
 	    return false;
 	}
@@ -760,10 +760,10 @@
 		continue;
 	    }
 	    log.debug("Removing Link {} on Port {}", link, portEvent);
-	    LinkEvent linkEvent = new LinkEvent(link.getSourceSwitchDpid(),
-						link.getSourcePortNumber(),
-						link.getDestinationSwitchDpid(),
-						link.getDestinationPortNumber());
+	    LinkEvent linkEvent = new LinkEvent(link.getSrcSwitch().getDpid(),
+						link.getSrcPort().getNumber(),
+						link.getDstSwitch().getDpid(),
+						link.getDstPort().getNumber());
 	    linksToRemove.add(linkEvent);
 	}
 	for (LinkEvent linkEvent : linksToRemove) {