diff --git a/apps/roadm/src/main/java/org/onosproject/roadm/RoadmUtil.java b/apps/roadm/src/main/java/org/onosproject/roadm/RoadmUtil.java
new file mode 100644
index 0000000..d125c77
--- /dev/null
+++ b/apps/roadm/src/main/java/org/onosproject/roadm/RoadmUtil.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.roadm;
+
+import org.onlab.util.Frequency;
+import org.onosproject.net.Annotations;
+
+import static com.google.common.base.Strings.isNullOrEmpty;
+
+/**
+ * Roadm utilities.
+ */
+public final class RoadmUtil {
+
+    public static final String DEV_ID = "devId";
+    public static final String VALID = "valid";
+    public static final String MESSAGE = "message";
+    public static final String NA = "N/A";
+    public static final String UNKNOWN = "Unknown";
+    public static final String NONE = "(none)";
+    public static final String NO_ROWS_MESSAGE = "No items found";
+
+    public static final long GHZ = 1_000_000_000L;
+    public static final long THZ = 1_000_000_000_000L;
+
+    private RoadmUtil() {
+    }
+
+    /**
+     * Formats Hz to GHz.
+     *
+     * @param value Hz in string format
+     * @return GHz in string format
+     */
+    public static String asGHz(Frequency value) {
+        return value == null ? UNKNOWN : String.valueOf((double) value.asHz() / GHZ);
+    }
+
+    /**
+     * Formats Hz to THz.
+     *
+     * @param value Hz in string format
+     * @return THz in string format
+     */
+    public static String asTHz(Frequency value) {
+        return value == null ? UNKNOWN : String.valueOf((double) value.asHz() / THZ);
+    }
+
+    /**
+     * Gives a default value if the string is null or empty.
+     *
+     * @param value the string value
+     * @param defaultValue default value if null or empty
+     * @return processed string
+     */
+    public static String defaultString(String value, String defaultValue) {
+        return isNullOrEmpty(value) ? defaultValue : value;
+    }
+
+    /**
+     * Gives a default value if the object is null.
+     *
+     * @param object the object
+     * @param defaultValue default value if null
+     * @return processed string
+     */
+    public static String objectToString(Object object, String defaultValue) {
+        return object == null ? defaultValue : String.valueOf(object);
+    }
+
+    /**
+     * Gets value from annotations, if not exists, return default value.
+     *
+     * @param annotations the annotations
+     * @param key key value
+     * @param defaultValue default value
+     * @return value in string format
+     */
+    public static String getAnnotation(Annotations annotations, String key, String defaultValue) {
+        return defaultString(annotations.value(key), defaultValue);
+    }
+
+    /**
+     * Gets value from annotations, default value is NA.
+     *
+     * @param annotations the annotations
+     * @param key key value
+     * @return value in string format
+     */
+    public static String getAnnotation(Annotations annotations, String key) {
+        return getAnnotation(annotations, key, NA);
+    }
+}
\ No newline at end of file