[ONOS-6316]create gRPC northbound Host Service and add unit tests

Change-Id: I385f52576000affd2523579c6a6f4c6d57e69938
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/ConnectPointProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/ConnectPointProtoTranslator.java
index c0177fe..6620096 100644
--- a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/ConnectPointProtoTranslator.java
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/ConnectPointProtoTranslator.java
@@ -16,7 +16,7 @@
 package org.onosproject.incubator.protobuf.models.net;
 
 import org.onlab.packet.IpAddress;
-import org.onosproject.grpc.net.models.ConnectPointProtoOuterClass;
+import org.onosproject.grpc.net.models.ConnectPointProtoOuterClass.ConnectPointProto;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.HostId;
@@ -40,7 +40,7 @@
      * @param connectPoint gRPC message
      * @return Optional of equivalent {@link org.onosproject.net.ConnectPoint} or empty if ElementId is not recognized
      */
-    public static Optional<ConnectPoint> translate(ConnectPointProtoOuterClass.ConnectPointProto connectPoint) {
+    public static Optional<ConnectPoint> translate(ConnectPointProto connectPoint) {
         switch (connectPoint.getElementIdCase()) {
             case DEVICE_ID:
                 return Optional.of(new ConnectPoint(DeviceId.deviceId(connectPoint.getDeviceId()),
@@ -65,20 +65,18 @@
      * @param connectPoint {@link org.onosproject.net.ConnectPoint}
      * @return gRPC ConnectPoint message
      */
-    public static ConnectPointProtoOuterClass.ConnectPointProto translate(ConnectPoint connectPoint) {
+    public static ConnectPointProto translate(ConnectPoint connectPoint) {
+
         if (connectPoint.elementId() instanceof DeviceId) {
-            return ConnectPointProtoOuterClass.ConnectPointProto.newBuilder()
-                    .setDeviceId(connectPoint.deviceId().toString())
+            return ConnectPointProto.newBuilder().setDeviceId(connectPoint.deviceId().toString())
                     .setPortNumber(connectPoint.port().toString())
                     .build();
         } else if (connectPoint.elementId() instanceof HostId) {
-            return ConnectPointProtoOuterClass.ConnectPointProto.newBuilder()
-                    .setHostId(connectPoint.hostId().toString())
+            return ConnectPointProto.newBuilder().setHostId(connectPoint.hostId().toString())
                     .setPortNumber(connectPoint.port().toString())
                     .build();
         } else if (connectPoint.ipElementId() instanceof IpElementId) {
-            return ConnectPointProtoOuterClass.ConnectPointProto.newBuilder()
-                    .setIpElementId(connectPoint.ipElementId().toString())
+            return ConnectPointProto.newBuilder().setIpElementId(connectPoint.ipElementId().toString())
                     .setPortNumber(connectPoint.port().toString())
                     .build();
         } else {
@@ -87,8 +85,6 @@
         }
     }
 
-
     // Utility class not intended for instantiation.
     private ConnectPointProtoTranslator() {}
-}
-
+}
\ No newline at end of file
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostIdProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostIdProtoTranslator.java
new file mode 100644
index 0000000..859cca4
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostIdProtoTranslator.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2017-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.incubator.protobuf.models.net;
+
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.grpc.net.models.HostIdProtoOuterClass.HostIdProto;
+import org.onosproject.net.HostId;
+
+/**
+ * gRPC HostIdProto message to equivalent ONOS HostId conversion related utilities.
+ */
+public final class HostIdProtoTranslator {
+
+    /**
+     * Translates gRPC HostId to {@link HostId}.
+     *
+     * @param hostId gRPC message
+     * @return {@link HostId}
+     */
+    public static HostId translate(HostIdProto hostId) {
+
+        if (hostId.equals(HostIdProto.getDefaultInstance())) {
+            return null;
+        }
+
+        return HostId.hostId(MacAddress.valueOf(hostId.getMac()), VlanId.vlanId((short) hostId.getVlanId()));
+    }
+
+    /**
+     * Translates {@link HostId} to gRPC HostId message.
+     *
+     * @param hostId {@link HostId}
+     * @return gRPC HostId message
+     */
+    public static HostIdProto translate(HostId hostId) {
+
+        if (hostId != null) {
+            return HostIdProto.newBuilder()
+                    .setMac(hostId.mac().toString())
+                    .setVlanId(hostId.vlanId().toShort())
+                    .build();
+        }
+
+        return HostIdProto.getDefaultInstance();
+    }
+
+    // Utility class not intended for instantiation.
+    private HostIdProtoTranslator() {}
+}
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostLocationProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostLocationProtoTranslator.java
new file mode 100644
index 0000000..098a276
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostLocationProtoTranslator.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2017-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.incubator.protobuf.models.net;
+
+import org.onosproject.grpc.net.models.ConnectPointProtoOuterClass.ConnectPointProto;
+import org.onosproject.grpc.net.models.HostLocationProtoOuterClass.HostLocationProto;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.HostLocation;
+import org.onosproject.net.PortNumber;
+
+/**
+ * gRPC HostLocationProto message to equivalent ONOS Host location conversion related utilities.
+ */
+public final class HostLocationProtoTranslator {
+
+    /**
+     * Translates gRPC HostLocation to {@link HostLocation}.
+     *
+     * @param hostLocation gRPC message
+     * @return {@link HostLocation}
+     */
+    public static HostLocation translate(HostLocationProto hostLocation) {
+
+        if (hostLocation.equals(HostLocationProto.getDefaultInstance())) {
+            return null;
+        }
+
+        return new HostLocation(DeviceId.deviceId(hostLocation.getConnectPoint().getDeviceId()),
+                                PortNumber.portNumber(hostLocation.getConnectPoint().getPortNumber()), 0L);
+    }
+
+    /**
+     * Translates {@link HostLocation} to gRPC HostLocation message.
+     *
+     * @param hostLocation {@link HostLocation}
+     * @return gRPC HostLocation message
+     */
+    public static HostLocationProto translate(HostLocation hostLocation) {
+
+        if (hostLocation != null) {
+            return HostLocationProto.newBuilder()
+                    .setConnectPoint(ConnectPointProto.newBuilder()
+                                             .setDeviceId(hostLocation.deviceId().toString())
+                                             .setPortNumber(hostLocation.port().toString()))
+                    .setTime(hostLocation.time())
+                    .build();
+        }
+
+        return HostLocationProto.getDefaultInstance();
+    }
+
+    // Utility class not intended for instantiation.
+    private HostLocationProtoTranslator() {}
+}
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostProtoTranslator.java
new file mode 100644
index 0000000..c12fd7f
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/HostProtoTranslator.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2017-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.incubator.protobuf.models.net;
+
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
+import org.onosproject.grpc.net.models.HostProtoOuterClass.HostProto;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DefaultHost;
+import org.onosproject.net.Host;
+
+import java.util.stream.Collectors;
+
+/**
+ * gRPC HostProto message to equivalent ONOS Host conversion related utilities.
+ */
+public final class HostProtoTranslator {
+
+
+    /**
+     * Translates {@link Host} to gRPC Host message.
+     *
+     * @param host {@link Host}
+     * @return gRPC HostProto message
+     */
+    public static HostProto translate(Host host) {
+
+        if (host != null) {
+            return HostProto.newBuilder()
+                    .setHostId(HostIdProtoTranslator.translate(host.id()))
+                    .setConfigured(host.configured())
+                    .setVlan(host.vlan().toShort())
+                    .addAllIpAddresses(host.ipAddresses().stream()
+                                               .map(IpAddress::toString)
+                                               .collect(Collectors.toList()))
+                    .setLocation(HostLocationProtoTranslator.translate(host.location()))
+                    .build();
+        }
+
+        return HostProto.getDefaultInstance();
+    }
+
+    /**
+     * Translates gRPC Host message to {@link Host}.
+     *
+     * @param host gRPC message
+     * @return {@link Host}
+     */
+    public static Host translate(HostProto host) {
+        if (host.equals(HostProto.getDefaultInstance())) {
+            return null;
+        }
+
+        return new DefaultHost(ProviderIdProtoTranslator.translate(host.getProviderId()),
+                               HostIdProtoTranslator.translate(host.getHostId()),
+                               MacAddress.valueOf(host.getHostId().getMac()),
+                               VlanId.vlanId((short) host.getVlan()),
+                               HostLocationProtoTranslator.translate(host.getLocation()),
+                               host.getIpAddressesList().stream().map(x -> IpAddress.valueOf(x))
+                                       .collect(Collectors.toSet()),
+                               DefaultAnnotations.builder().putAll(host.getAnnotationsMap()).build());
+    }
+
+    // Utility class not intended for instantiation.
+    private HostProtoTranslator() {}
+}