[ONOS-3878] YANG Parser External Interface

Change-Id: I6994bf82bb6253d0c68a88142738d55898f5a069

+/*
+ * Copyright 2016 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.yangutils.parser;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+
+/**
+ * Abstraction of entity which provides parser service of YANG files for yangutils-maven-plugin.
+ */
+public interface YangUtilsParser {
+
+    /**
+     * It is an entry function to initiate the YANG file parsing.
+     *
+     * @param file input YANG file
+     * @return YangNode root node of the data model tree
+     */
+    YangNode getDataModel(String file);
+}