Created RegionService and added unit tests.

Change-Id: If3735d160ead9269b8bb327a99d6dad85e5c57d0
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/RegionProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/RegionProtoTranslator.java
new file mode 100644
index 0000000..5baea7a
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/RegionProtoTranslator.java
@@ -0,0 +1,94 @@
+/*
+ * 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 com.google.common.base.Strings;
+import org.onosproject.incubator.protobuf.models.ProtobufUtils;
+import org.onosproject.incubator.protobuf.models.net.region.RegionEnumsProtoTranslator;
+
+
+
+import org.onosproject.cluster.NodeId;
+import org.onosproject.grpc.net.models.RegionProtoOuterClass;
+import org.onosproject.net.Annotations;
+import org.onosproject.net.region.DefaultRegion;
+import org.onosproject.net.region.Region;
+import org.onosproject.net.region.RegionId;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * gRPC Region message to @link org.onosproject.net.region.Region conversion related utilities for region service.
+ */
+public final class RegionProtoTranslator {
+
+    /**
+     * Translates gRPC RegionProto message to {@link org.onosproject.net.region.Region}.
+     *
+     * @param region gRPC message
+     * @return {@link org.onosproject.net.region.Region}
+     */
+    public static Region translate(RegionProtoOuterClass.RegionProto region) {
+        RegionId id = RegionId.regionId(region.getRegionId());
+        Region.Type type = RegionEnumsProtoTranslator.translate(region.getType()).get();
+        String name = Strings.nullToEmpty(region.getName());
+
+        List<Set<NodeId>> masters = new ArrayList<>();
+
+        region.getMastersList().forEach(s -> {
+            Set<NodeId> nodeIdSet = new HashSet<NodeId>();
+            s.getNodeIdList().forEach(n -> {
+                nodeIdSet.add(new NodeId(n));
+            });
+            masters.add(nodeIdSet);
+        });
+
+        Annotations annots = ProtobufUtils.asAnnotations(region.getAnnotations());
+
+        return new DefaultRegion(id, name, type, annots, masters);
+    }
+
+    /**
+     * Translates {@link org.onosproject.net.region.Region} to gRPC RegionProto message.
+     *
+     * @param region {@link org.onosproject.net.region.Region}
+     * @return gRPC RegionProto message
+     */
+    public static RegionProtoOuterClass.RegionProto translate(Region region) {
+        return RegionProtoOuterClass.RegionProto.newBuilder()
+                .setRegionId(region.id().toString())
+                .setType(RegionEnumsProtoTranslator.translate(region.type()))
+                .setName(region.name().isEmpty() ? null : region.name())
+                .addAllMasters(region.masters()
+                                       .stream()
+                                       .map(s -> RegionProtoOuterClass.RegionProto.NodeIdSet
+                                               .newBuilder()
+                                               .addAllNodeId(s.stream().map(id -> {
+                                                   return id.toString();
+                                               }).collect(Collectors.toList()))
+                                               .build())
+                                       .collect(Collectors.toList()))
+                .build();
+    }
+
+    // Utility class not intended for instantiation.
+    private RegionProtoTranslator() {}
+
+}
+
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/region/RegionEnumsProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/region/RegionEnumsProtoTranslator.java
new file mode 100644
index 0000000..6f3130f
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/region/RegionEnumsProtoTranslator.java
@@ -0,0 +1,104 @@
+/*
+ * 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.region;
+
+import org.onosproject.grpc.net.region.models.RegionEnumsProto;
+import org.onosproject.net.region.Region;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Optional;
+
+/**
+ * gRPC RegionType message to equivalent ONOS enum conversion related utilities.
+ */
+public final class RegionEnumsProtoTranslator {
+
+    private static final Logger log = LoggerFactory.getLogger(RegionEnumsProtoTranslator.class);
+
+    /**
+     * Translates gRPC enum RegionType to Optional of ONOS enum.
+     *
+     * @param type regiontype type in gRPC enum
+     * @return Optional of equivalent ONOS enum or empty if not recognized
+     */
+    public static Optional<Region.Type> translate(RegionEnumsProto.RegionTypeProto type) {
+        switch (type) {
+            case CONTINENT:
+                return Optional.of(Region.Type.CONTINENT);
+            case COUNTRY:
+                return Optional.of(Region.Type.COUNTRY);
+            case METRO:
+                return Optional.of(Region.Type.METRO);
+            case CAMPUS:
+                return Optional.of(Region.Type.CAMPUS);
+            case BUILDING:
+                return Optional.of(Region.Type.BUILDING);
+            case DATA_CENTER:
+                return Optional.of(Region.Type.DATA_CENTER);
+            case FLOOR:
+                return Optional.of(Region.Type.FLOOR);
+            case ROOM:
+                return Optional.of(Region.Type.ROOM);
+            case RACK:
+                return Optional.of(Region.Type.RACK);
+            case LOGICAL_GROUP:
+                return Optional.of(Region.Type.LOGICAL_GROUP);
+            default:
+                log.warn("Unrecognized Type gRPC message: {}", type);
+                return Optional.empty();
+        }
+    }
+
+
+    /**
+     * Translates ONOS enum regionType to gRPC enum regionType.
+     *
+     * @param type ONOS' Type type
+     * @return equivalent gRPC message enum
+     */
+    public static RegionEnumsProto.RegionTypeProto translate(Region.Type type) {
+        switch (type) {
+            case CONTINENT:
+                return RegionEnumsProto.RegionTypeProto.CONTINENT;
+            case COUNTRY:
+                return RegionEnumsProto.RegionTypeProto.COUNTRY;
+            case METRO:
+                return RegionEnumsProto.RegionTypeProto.METRO;
+            case CAMPUS:
+                return RegionEnumsProto.RegionTypeProto.CAMPUS;
+            case BUILDING:
+                return RegionEnumsProto.RegionTypeProto.BUILDING;
+            case DATA_CENTER:
+                return RegionEnumsProto.RegionTypeProto.DATA_CENTER;
+            case FLOOR:
+                return RegionEnumsProto.RegionTypeProto.FLOOR;
+            case ROOM:
+                return RegionEnumsProto.RegionTypeProto.ROOM;
+            case RACK:
+                return RegionEnumsProto.RegionTypeProto.RACK;
+            case LOGICAL_GROUP:
+                return RegionEnumsProto.RegionTypeProto.LOGICAL_GROUP;
+            default:
+                log.warn("Unrecognized type", type);
+                throw new IllegalArgumentException("Unrecognized Type");
+        }
+    }
+
+    // Utility class not intended for instantiation.
+    private RegionEnumsProtoTranslator() {}
+}
+
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/region/package-info.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/region/package-info.java
new file mode 100644
index 0000000..459ad32
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/region/package-info.java
@@ -0,0 +1,19 @@
+/*
+ * 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.
+ */
+/**
+ * Utilities to handle ProtoBuf version of ONOS region models.
+ */
+package org.onosproject.incubator.protobuf.models.net.region;