added IPAddress construct

Change-Id: Idc57a22b568b33503c78254222d52fbfc19b0b72
diff --git a/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java b/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java
index e5d641f..09829fe 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java
@@ -8,23 +8,26 @@
 import java.util.Set;
 
 import org.onlab.onos.net.provider.ProviderId;
-import org.onlab.packet.IPv4;
+import org.onlab.packet.IPAddress;
 import org.onlab.packet.MACAddress;
 
+/**
+ * A basic implementation of a Host.
+ */
 public class DefaultHost extends AbstractElement implements Host {
 
     private final MACAddress mac;
     private final short vlan;
     private final HostLocation location;
-    private final Set<IPv4> ips;
+    private final Set<IPAddress> ips;
 
     public DefaultHost(ProviderId providerId, ElementId id, MACAddress mac,
-            short vlan, HostLocation loc, Set<IPv4> ips) {
+            short vlan, HostLocation loc, Set<IPAddress> ips) {
         super(providerId, id);
         this.mac = mac;
         this.vlan = vlan;
         this.location = loc;
-        this.ips = new HashSet<IPv4>(ips);
+        this.ips = new HashSet<IPAddress>(ips);
     }
 
     @Override
@@ -38,7 +41,7 @@
     }
 
     @Override
-    public Set<IPv4> ipAddresses() {
+    public Set<IPAddress> ipAddresses() {
         return Collections.unmodifiableSet(ips);
     }