NodePortTuple class implements comparable to allow for sorting of nodeport...

NodePortTuple class implements comparable to allow for sorting of nodeport tuples. The sorting is first based on the switch id and then on the port id.

src/main/java/net/floodlightcontroller/topology/NodePortTuple.java

@@ -29,7 +29,8 @@ import org.openflow.util.HexString;
  * to the actual objects.
  * @author srini
  */
-public class NodePortTuple {
+
+public class NodePortTuple implements Comparable<NodePortTuple> {
     protected long nodeId; // switch DPID
     protected short portId; // switch port id
 
@@ -93,7 +94,7 @@ public class NodePortTuple {
             return false;
         return true;
     }
-    
+
     /**
      * API to return a String value formed wtih NodeID and PortID
      * The portID is a 16-bit field, so mask it as an integer to get full
@@ -103,4 +104,23 @@ public class NodePortTuple {
     public String toKeyString() {
         return (HexString.toHexString(nodeId)+ "|" + (portId & 0xffff));
     }
+
+    @Override
+    public int compareTo(NodePortTuple obj) {
+        final int BEFORE = -1;
+        final int EQUAL = 0;
+        final int AFTER = 1;
+
+        if (this.getNodeId() < obj.getNodeId())
+            return BEFORE;
+        if (this.getNodeId() > obj.getNodeId())
+            return AFTER;
+
+        if (this.getPortId() < obj.getPortId())
+            return BEFORE;
+        if (this.getPortId() > obj.getPortId())
+            return AFTER;
+
+        return EQUAL;
+    }
 }