[ONOS-3878] YANG Listeners methods for Module and SubModule
Change-Id: Ied2fcf631d302b26ef84af8e98895d8ccb6d6269
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ImportListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ImportListener.java
new file mode 100644
index 0000000..ef53b3d
--- /dev/null
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ImportListener.java
@@ -0,0 +1,78 @@
+/*
+ * 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.impl.listeners;
+
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * linkage-stmts = ;; these stmts can appear in any order
+ * *(import-stmt stmtsep)
+ * *(include-stmt stmtsep)
+ *
+ * import-stmt = import-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * prefix-stmt stmtsep
+ * [revision-date-stmt stmtsep]
+ * "}"
+ *
+ * ANTLR grammar rule
+ * linkage_stmts : (import_stmt
+ * | include_stmt)*;
+ * import_stmt : IMPORT_KEYWORD IDENTIFIER LEFT_CURLY_BRACE import_stmt_body
+ * RIGHT_CURLY_BRACE;
+ * import_stmt_body : prefix_stmt revision_date_stmt?;
+ */
+
+/**
+ * Implements listener based call back function corresponding to the "import"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ImportListener {
+
+ /**
+ * Creates a new import listener.
+ */
+ private ImportListener() {
+ }
+
+ /**
+ * It is called when parser receives an input matching the grammar
+ * rule (import), perform validations and update the data model
+ * tree.
+ *
+ * @param listener Listener's object.
+ * @param ctx context object of the grammar rule.
+ */
+ public static void processImportEntry(TreeWalkListener listener, GeneratedYangParser.ImportStatementContext ctx) {
+ // TODO method implementation
+ }
+
+ /**
+ * It is called when parser exits from grammar rule (import), it perform
+ * validations and update the data model tree.
+ *
+ * @param listener Listener's object.
+ * @param ctx context object of the grammar rule.
+ */
+ public static void processImportExit(TreeWalkListener listener, GeneratedYangParser.ImportStatementContext ctx) {
+ // TODO method implementation
+ }
+}