[ONOS-5916] Add a mapping instruction interface with impl classes

Change-Id: I21399cd9853fe4604641af5ad57cd61f02cf354c
diff --git a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/instructions/MappingInstruction.java b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/instructions/MappingInstruction.java
new file mode 100644
index 0000000..81faf05
--- /dev/null
+++ b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/instructions/MappingInstruction.java
@@ -0,0 +1,55 @@
+/*
+ * 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.instructions;
+
+/**
+ * Presentation of a single mapping instruction.
+ */
+public interface MappingInstruction {
+
+    /**
+     * Represents the type of mapping instruction.
+     */
+    enum Type {
+
+        /**
+         * Signifies that the traffic should be uni-casted with TE parameters.
+         */
+        UNICAST,
+
+        /**
+         * Signifies that the traffic should be multi-casted with TE parameters.
+         */
+        MULTICAST,
+
+        /**
+         * Signifies that the traffic should be treated with a certain action.
+         */
+        ACTION,
+
+        /**
+         * Signifies that an extension instruction will be used.
+         */
+        EXTENSION
+    }
+
+    /**
+     * Returns the type of instruction.
+     *
+     * @return type of instruction
+     */
+    Type type();
+}