ONOS-4083, ONOS-4084, ONOS-4096, ONOS-4097:ISIS PDU Data Structures

Change-Id: I22d30e8f7ba7d414e75254fdec6d0865bf471ff9
diff --git a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/util/IsisConfig.java b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/util/IsisConfig.java
new file mode 100644
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--- /dev/null
+++ b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/util/IsisConfig.java
@@ -0,0 +1,44 @@
+/*
+ * 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.isis.io.util;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Representation of ISIS config.
+ */
+public enum IsisConfig {
+    INSTANCE;
+    private JsonNode jsonNodes = null;
+
+    /**
+     * Returns the config value.
+     *
+     * @return jsonNodes json node
+     */
+    public JsonNode config() {
+        return jsonNodes;
+    }
+
+    /**
+     * Sets the config value for jsonNode.
+     *
+     * @param jsonNodes json node
+     */
+    public void setConfig(JsonNode jsonNodes) {
+        this.jsonNodes = jsonNodes;
+    }
+}
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