[ONOS-7905] Add default implementation for kubernetes data model

Change-Id: I08e9266dec2050e8299e4189745608a6e03fd06e
diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/DefaultK8sIpam.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/DefaultK8sIpam.java
new file mode 100644
index 0000000..cb488b3
--- /dev/null
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/DefaultK8sIpam.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2019-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.k8snetworking.api;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onlab.packet.IpAddress;
+
+/**
+ * Default implementation of kubernetes IPAM instance.
+ */
+public final class DefaultK8sIpam implements K8sIpam {
+
+    private final IpAddress ipAddress;
+    private final String networkId;
+
+    // private constructor not intended for external invocation
+    public DefaultK8sIpam(IpAddress ipAddress, String networkId) {
+        this.ipAddress = ipAddress;
+        this.networkId = networkId;
+    }
+
+    @Override
+    public IpAddress ipAddress() {
+        return ipAddress;
+    }
+
+    @Override
+    public String networkId() {
+        return networkId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultK8sIpam that = (DefaultK8sIpam) o;
+        return Objects.equal(ipAddress, that.ipAddress) &&
+                Objects.equal(networkId, that.networkId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(ipAddress, networkId);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("ipAddress", ipAddress)
+                .add("networkId", networkId)
+                .toString();
+    }
+}