[ONOS-5916] Add interfaces with adaptor for mapping management app

Change-Id: I44cec28ec50b77d2a40c3650b59c96f02ec48f4f
diff --git a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingId.java b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingId.java
new file mode 100644
index 0000000..703012e
--- /dev/null
+++ b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/MappingId.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2017-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.mapping;
+
+import org.onlab.util.Identifier;
+
+/**
+ * Representation of a Mapping ID.
+ */
+public final class MappingId extends Identifier<Long> {
+
+    /**
+     * Private constructor that prevents instantiation from external.
+     *
+     * @param id mapping identifier
+     */
+    private MappingId(long id) {
+        super(id);
+    }
+
+    /**
+     * Creates a mapping identifier from a long value.
+     *
+     * @param id mapping identifier in long format
+     * @return mapping identifier
+     */
+    public static MappingId valueOf(long id) {
+        return new MappingId(id);
+    }
+
+    /**
+     * Obtains mapping identifier value.
+     *
+     * @return mapping identifier value as long
+     */
+    public long value() {
+        return this.identifier;
+    }
+
+    @Override
+    public String toString() {
+        return Long.toHexString(identifier);
+    }
+}