Kryo related changes.

Change-Id: I5b4fab63d6ece084b65aa712971a22d953d0caf0
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
new file mode 100644
index 0000000..4a60eb8
--- /dev/null
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
@@ -0,0 +1,53 @@
+package org.onlab.onos.store.device.impl;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import org.onlab.onos.net.DefaultPort;
+import org.onlab.onos.net.Element;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.packet.IpPrefix;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import com.esotericsoftware.kryo.serializers.CollectionSerializer;
+import com.google.common.collect.ImmutableSet;
+
+// TODO move to util, etc.
+public final class DefaultPortSerializer extends
+        Serializer<DefaultPort> {
+
+    private final CollectionSerializer ipAddrSerializer
+        = new CollectionSerializer(IpPrefix.class,
+                            new IpPrefixSerializer(), false);
+
+    public DefaultPortSerializer() {
+        // non-null, immutable
+        super(false, true);
+    }
+
+    @Override
+    public void write(Kryo kryo, Output output, DefaultPort object) {
+        kryo.writeClassAndObject(output, object.element());
+        kryo.writeObject(output, object.number());
+        output.writeBoolean(object.isEnabled());
+        kryo.writeObject(output, object.ipAddresses(),
+                ipAddrSerializer);
+    }
+
+    @Override
+    public DefaultPort read(Kryo kryo, Input input,
+            Class<DefaultPort> type) {
+        Element element = (Element) kryo.readClassAndObject(input);
+        PortNumber number = kryo.readObject(input, PortNumber.class);
+        boolean isEnabled = input.readBoolean();
+        @SuppressWarnings("unchecked")
+        Collection<IpPrefix> ipAddresses = kryo.readObject(
+                    input, ArrayList.class, ipAddrSerializer);
+
+        return new DefaultPort(element, number, isEnabled,
+                            ImmutableSet.copyOf(ipAddresses));
+    }
+}