Add kubevirt node related codec with unit tests

Change-Id: I0c68d4c3d0c7626a4b6b66e5c783631cb9be50a8
diff --git a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtPhyInterfaceCodec.java b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtPhyInterfaceCodec.java
new file mode 100644
index 0000000..3ba0164
--- /dev/null
+++ b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtPhyInterfaceCodec.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.kubevirtnode.codec;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.kubevirtnode.api.DefaultKubevirtPhyInterface;
+import org.onosproject.kubevirtnode.api.KubevirtPhyInterface;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.util.Tools.nullIsIllegal;
+
+/**
+ * Kubevirt physical interface codec used for serializing and de-serializing JSON string.
+ */
+public final class KubevirtPhyInterfaceCodec extends JsonCodec<KubevirtPhyInterface> {
+
+    private static final String NETWORK = "network";
+    private static final String INTERFACE = "intf";
+
+    private static final String MISSING_MESSAGE = " is required in KubevirtPhyInterface";
+
+    @Override
+    public ObjectNode encode(KubevirtPhyInterface phyIntf, CodecContext context) {
+        checkNotNull(phyIntf, "Kubevirt physical interface cannot be null");
+
+        return context.mapper().createObjectNode()
+                .put(NETWORK, phyIntf.network())
+                .put(INTERFACE, phyIntf.intf());
+    }
+
+    @Override
+    public KubevirtPhyInterface decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        String network = nullIsIllegal(json.get(NETWORK).asText(),
+                NETWORK + MISSING_MESSAGE);
+        String intf = nullIsIllegal(json.get(INTERFACE).asText(),
+                INTERFACE + MISSING_MESSAGE);
+
+        return DefaultKubevirtPhyInterface.builder()
+                .network(network)
+                .intf(intf)
+                .build();
+    }
+}