diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/AnnotationsTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/AnnotationsTranslator.java
new file mode 100644
index 0000000..0b8cb03
--- /dev/null
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/AnnotationsTranslator.java
@@ -0,0 +1,71 @@
+/*
+ * 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.net.Annotations;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.SparseAnnotations;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * gRPC message conversion related utilities for annotations service.
+ */
+public final class AnnotationsTranslator {
+
+    private static final Logger log = LoggerFactory.getLogger(AnnotationsTranslator.class);
+
+    /**
+     * Converts Annotations to Map of Strings.
+     *
+     * @param annotations {@link Annotations}
+     * @return Map of annotation key and values
+     */
+    public static Map<String, String> asMap(Annotations annotations) {
+        if (annotations instanceof DefaultAnnotations) {
+            return ((DefaultAnnotations) annotations).asMap();
+        }
+        Map<String, String> map = new HashMap<>();
+        annotations.keys()
+                .forEach(k -> map.put(k, annotations.value(k)));
+
+        return map;
+    }
+
+    /**
+     * Converts Map of Strings to {@link SparseAnnotations}.
+     *
+     * @param annotations Map of annotation key and values
+     * @return {@link SparseAnnotations}
+     */
+    public static SparseAnnotations asAnnotations(Map<String, String> annotations) {
+        DefaultAnnotations.Builder builder = DefaultAnnotations.builder();
+        annotations.entrySet().forEach(e -> {
+            if (e.getValue() != null) {
+                builder.set(e.getKey(), e.getValue());
+            } else {
+                builder.remove(e.getKey());
+            }
+        });
+        return builder.build();
+    }
+
+    // Utility class not intended for instantiation.
+    private AnnotationsTranslator() {}
+}
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
index 16b5557..bd43c0b 100644
--- 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
@@ -14,16 +14,12 @@
  * limitations under the License.
  */
 package org.onosproject.incubator.protobuf.models.net;
+
 import com.google.common.base.Strings;
-import org.onosproject.incubator.protobuf.models.net.region.RegionEnumsProtoTranslator;
-
-
-
 import org.onosproject.cluster.NodeId;
 import org.onosproject.grpc.net.models.RegionProtoOuterClass;
+import org.onosproject.incubator.protobuf.models.net.region.RegionEnumsProtoTranslator;
 import org.onosproject.net.Annotations;
-import org.onosproject.net.DefaultAnnotations;
-import org.onosproject.net.SparseAnnotations;
 import org.onosproject.net.region.DefaultRegion;
 import org.onosproject.net.region.Region;
 import org.onosproject.net.region.RegionId;
@@ -31,7 +27,6 @@
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -61,7 +56,7 @@
             masters.add(nodeIdSet);
         });
 
-        Annotations annots = asAnnotations(region.getAnnotations());
+        Annotations annots = AnnotationsTranslator.asAnnotations(region.getAnnotations());
 
         return new DefaultRegion(id, name, type, annots, masters);
     }
@@ -89,25 +84,6 @@
                 .build();
     }
 
-    // may be this can be moved to Annotation itself or AnnotationsUtils
-    /**
-     * Converts Map of Strings to {@link SparseAnnotations}.
-     *
-     * @param annotations Map of annotation key and values
-     * @return {@link SparseAnnotations}
-     */
-    public static SparseAnnotations asAnnotations(Map<String, String> annotations) {
-        DefaultAnnotations.Builder builder = DefaultAnnotations.builder();
-        annotations.entrySet().forEach(e -> {
-            if (e.getValue() != null) {
-                builder.set(e.getKey(), e.getValue());
-            } else {
-                builder.remove(e.getKey());
-            }
-        });
-        return builder.build();
-    }
-
     // Utility class not intended for instantiation.
     private RegionProtoTranslator() {}
 
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/DeviceProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/DeviceProtoTranslator.java
index 495da82..90d10f5 100644
--- a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/DeviceProtoTranslator.java
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/DeviceProtoTranslator.java
@@ -19,18 +19,14 @@
 import org.onosproject.grpc.net.device.models.DeviceDescriptionProtoOuterClass;
 import org.onosproject.grpc.net.device.models.DeviceDescriptionProtoOuterClass.DeviceDescriptionProto;
 import org.onosproject.grpc.net.device.models.DeviceEnumsProto.DeviceTypeProto;
-import org.onosproject.net.Annotations;
-import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.incubator.protobuf.models.net.AnnotationsTranslator;
 import org.onosproject.net.Device.Type;
-import org.onosproject.net.SparseAnnotations;
 import org.onosproject.net.device.DefaultDeviceDescription;
 import org.onosproject.net.device.DeviceDescription;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.net.URI;
-import java.util.HashMap;
-import java.util.Map;
 
 /**
  * gRPC message conversion related utilities for device service.
@@ -59,7 +55,7 @@
                 hwVersion, swVersion, serialNumber,
                 chassis,
                 defaultAvailable,
-                asAnnotations(deviceDescription.getAnnotationsMap()));
+                AnnotationsTranslator.asAnnotations(deviceDescription.getAnnotationsMap()));
     }
 
     /**
@@ -80,7 +76,7 @@
                 .setSerialNumber(deviceDescription.serialNumber())
                 .setChassisId(deviceDescription.chassisId().toString())
                 .setIsDefaultAvailable(deviceDescription.isDefaultAvailable())
-                .putAllAnnotations(asMap(deviceDescription.annotations()))
+                .putAllAnnotations(AnnotationsTranslator.asMap(deviceDescription.annotations()))
                 .build();
     }
 
@@ -172,44 +168,6 @@
         }
     }
 
-
-    // may be this can be moved to Annotation itself or AnnotationsUtils
-    /**
-     * Converts Annotations to Map of Strings.
-     *
-     * @param annotations {@link Annotations}
-     * @return Map of annotation key and values
-     */
-    public static Map<String, String> asMap(Annotations annotations) {
-        if (annotations instanceof DefaultAnnotations) {
-            return ((DefaultAnnotations) annotations).asMap();
-        }
-        Map<String, String> map = new HashMap<>();
-        annotations.keys()
-                .forEach(k -> map.put(k, annotations.value(k)));
-
-        return map;
-    }
-
-    // may be this can be moved to Annotation itself or AnnotationsUtils
-    /**
-     * Converts Map of Strings to {@link SparseAnnotations}.
-     *
-     * @param annotations Map of annotation key and values
-     * @return {@link SparseAnnotations}
-     */
-    public static SparseAnnotations asAnnotations(Map<String, String> annotations) {
-        DefaultAnnotations.Builder builder = DefaultAnnotations.builder();
-        annotations.entrySet().forEach(e -> {
-            if (e.getValue() != null) {
-                builder.set(e.getKey(), e.getValue());
-            } else {
-                builder.remove(e.getKey());
-            }
-        });
-        return builder.build();
-    }
-
     // Utility class not intended for instantiation.
     private DeviceProtoTranslator() {
     }
diff --git a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/PortProtoTranslator.java b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/PortProtoTranslator.java
index 91bcd32..0d0e0fa 100644
--- a/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/PortProtoTranslator.java
+++ b/incubator/protobuf/models/src/main/java/org/onosproject/incubator/protobuf/models/net/device/PortProtoTranslator.java
@@ -19,8 +19,7 @@
 import org.onosproject.grpc.net.device.models.PortEnumsProto;
 import org.onosproject.grpc.net.device.models.PortStatisticsProtoOuterClass;
 import org.onosproject.grpc.net.device.models.PortStatisticsProtoOuterClass.PortStatisticsProto;
-import org.onosproject.net.Annotations;
-import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.incubator.protobuf.models.net.AnnotationsTranslator;
 import org.onosproject.net.Port;
 import org.onosproject.net.PortNumber;
 import org.onosproject.net.SparseAnnotations;
@@ -31,9 +30,6 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * gRPC message conversion related utilities for port service.
  */
@@ -52,7 +48,7 @@
         boolean isEnabled = portDescription.getIsEnabled();
         Port.Type type = translate(portDescription.getType());
         long portSpeed = portDescription.getPortSpeed();
-        SparseAnnotations annotations = asAnnotations(portDescription.getAnnotationsMap());
+        SparseAnnotations annotations = AnnotationsTranslator.asAnnotations(portDescription.getAnnotationsMap());
         // TODO How to deal with more specific Port...
         return new DefaultPortDescription(number, isEnabled, type, portSpeed, annotations);
     }
@@ -69,7 +65,7 @@
                 .setIsEnabled(portDescription.isEnabled())
                 .setType(translate(portDescription.type()))
                 .setPortSpeed(portDescription.portSpeed())
-                .putAllAnnotations(asMap(portDescription.annotations()))
+                .putAllAnnotations(AnnotationsTranslator.asMap(portDescription.annotations()))
                 .build();
     }
 
@@ -162,44 +158,6 @@
                 .build();
     }
 
-
-    // may be this can be moved to Annotation itself or AnnotationsUtils
-    /**
-     * Converts Annotations to Map of Strings.
-     *
-     * @param annotations {@link Annotations}
-     * @return Map of annotation key and values
-     */
-    public static Map<String, String> asMap(Annotations annotations) {
-        if (annotations instanceof DefaultAnnotations) {
-            return ((DefaultAnnotations) annotations).asMap();
-        }
-        Map<String, String> map = new HashMap<>();
-        annotations.keys()
-                .forEach(k -> map.put(k, annotations.value(k)));
-
-        return map;
-    }
-
-    // may be this can be moved to Annotation itself or AnnotationsUtils
-    /**
-     * Converts Map of Strings to {@link SparseAnnotations}.
-     *
-     * @param annotations Map of annotation key and values
-     * @return {@link SparseAnnotations}
-     */
-    public static SparseAnnotations asAnnotations(Map<String, String> annotations) {
-        DefaultAnnotations.Builder builder = DefaultAnnotations.builder();
-        annotations.entrySet().forEach(e -> {
-            if (e.getValue() != null) {
-                builder.set(e.getKey(), e.getValue());
-            } else {
-                builder.remove(e.getKey());
-            }
-        });
-        return builder.build();
-    }
-
     // Utility class not intended for instantiation.
     private PortProtoTranslator() {}
 }