[ONOS-4895] Add a method to get VirtualPort based on mac

Change-Id: I3cd6c1ce43f33315f6b73342c6f6393376fff8de
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
index d352cb3..b0c5df8 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
@@ -31,6 +31,7 @@
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
 import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
 import org.onlab.util.KryoNamespace;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
@@ -79,6 +80,7 @@
     private static final String NETWORKID_NOT_NULL = "NetworkId  cannot be null";
     private static final String DEVICEID_NOT_NULL = "DeviceId  cannot be null";
     private static final String FIXEDIP_NOT_NULL = "FixedIp  cannot be null";
+    private static final String MAC_NOT_NULL = "Mac address  cannot be null";
     private static final String IP_NOT_NULL = "Ip  cannot be null";
     private static final String EVENT_NOT_NULL = "event cannot be null";
 
@@ -164,6 +166,21 @@
     }
 
     @Override
+    public VirtualPort getPort(MacAddress mac) {
+        checkNotNull(mac, MAC_NOT_NULL);
+        List<VirtualPort> vPorts = new ArrayList<>();
+        vPortStore.values().stream().forEach(p -> {
+            if (p.macAddress().equals(mac)) {
+                vPorts.add(p);
+            }
+        });
+        if (vPorts.size() == 0) {
+            return null;
+        }
+        return vPorts.get(0);
+    }
+
+    @Override
     public VirtualPort getPort(TenantNetworkId networkId, IpAddress ip) {
         checkNotNull(networkId, NETWORKID_NOT_NULL);
         checkNotNull(ip, IP_NOT_NULL);