Implement kubevirt floating IP's class, codec, watcher and APIs

Change-Id: I2111902e86083add8a00af62557fac1e98b7e7fc
(cherry picked from commit e48a617ccaf19d0d29ccc3211f6254be5e26826e)
diff --git a/apps/kubevirt-networking/api/src/main/java/org/onosproject/kubevirtnetworking/api/DefaultKubevirtFloatingIp.java b/apps/kubevirt-networking/api/src/main/java/org/onosproject/kubevirtnetworking/api/DefaultKubevirtFloatingIp.java
new file mode 100644
index 0000000..6dc98e2
--- /dev/null
+++ b/apps/kubevirt-networking/api/src/main/java/org/onosproject/kubevirtnetworking/api/DefaultKubevirtFloatingIp.java
@@ -0,0 +1,190 @@
+/*
+ * Copyright 2021-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.kubevirtnetworking.api;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.packet.IpAddress;
+
+import java.util.Objects;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Default implementation class of kubevirt floating IP.
+ */
+public final class DefaultKubevirtFloatingIp implements KubevirtFloatingIp {
+
+    private static final String NOT_NULL_MSG = "Floating IP % cannot be null";
+
+    private final String id;
+    private final String routerName;
+    private final String podName;
+    private final IpAddress floatingIp;
+    private final IpAddress fixedIp;
+
+    /**
+     * A default constructor.
+     *
+     * @param id            floating IP identifier
+     * @param routerName    router name
+     * @param podName       POD name
+     * @param floatingIp    floating IP address
+     * @param fixedIp       fixed IP address
+     */
+    public DefaultKubevirtFloatingIp(String id, String routerName, String podName,
+                                     IpAddress floatingIp, IpAddress fixedIp) {
+        this.id = id;
+        this.routerName = routerName;
+        this.podName = podName;
+        this.floatingIp = floatingIp;
+        this.fixedIp = fixedIp;
+    }
+
+    @Override
+    public String id() {
+        return id;
+    }
+
+    @Override
+    public String routerName() {
+        return routerName;
+    }
+
+    @Override
+    public IpAddress floatingIp() {
+        return floatingIp;
+    }
+
+    @Override
+    public IpAddress fixedIp() {
+        return fixedIp;
+    }
+
+    @Override
+    public String podName() {
+        return podName;
+    }
+
+    @Override
+    public KubevirtFloatingIp updateFixedIp(IpAddress ip) {
+        return DefaultKubevirtFloatingIp.builder()
+                .id(id)
+                .routerName(routerName)
+                .floatingIp(floatingIp)
+                .fixedIp(ip)
+                .podName(podName)
+                .build();
+    }
+
+    @Override
+    public KubevirtFloatingIp updatePodName(String name) {
+        return DefaultKubevirtFloatingIp.builder()
+                .id(id)
+                .routerName(routerName)
+                .floatingIp(floatingIp)
+                .fixedIp(fixedIp)
+                .podName(name)
+                .build();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        DefaultKubevirtFloatingIp that = (DefaultKubevirtFloatingIp) o;
+        return id.equals(that.id) && routerName.equals(that.routerName) &&
+                Objects.equals(podName, that.podName) &&
+                floatingIp.equals(that.floatingIp) &&
+                Objects.equals(fixedIp, that.fixedIp);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, routerName, podName, floatingIp, fixedIp);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("id", id)
+                .add("routerName", routerName)
+                .add("podName", podName)
+                .add("floatingIp", floatingIp)
+                .add("fixedIp", fixedIp)
+                .toString();
+    }
+
+    /**
+     * Returns new builder instance.
+     *
+     * @return kubevirt floating IP builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder implements KubevirtFloatingIp.Builder {
+
+        private String id;
+        private String routerName;
+        private String podName;
+        private IpAddress floatingIp;
+        private IpAddress fixedIp;
+
+        @Override
+        public KubevirtFloatingIp build() {
+            checkArgument(id != null, NOT_NULL_MSG, "id");
+            checkArgument(routerName != null, NOT_NULL_MSG, "routerName");
+            checkArgument(floatingIp != null, NOT_NULL_MSG, "floatingIp");
+
+            return new DefaultKubevirtFloatingIp(id, routerName, podName, floatingIp, fixedIp);
+        }
+
+        @Override
+        public Builder id(String id) {
+            this.id = id;
+            return this;
+        }
+
+        @Override
+        public Builder routerName(String name) {
+            this.routerName = name;
+            return this;
+        }
+
+        @Override
+        public Builder floatingIp(IpAddress ip) {
+            this.floatingIp = ip;
+            return this;
+        }
+
+        @Override
+        public Builder fixedIp(IpAddress ip) {
+            this.fixedIp = ip;
+            return this;
+        }
+
+        @Override
+        public Builder podName(String name) {
+            this.podName = name;
+            return this;
+        }
+    }
+}