[ONOS-4350] Inter Jar dependency implementation and code restructuring.
Change-Id: Iacac75e4187aed93ce1754c170a9c19707e5b8c3
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/VersionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/VersionListener.java
new file mode 100644
index 0000000..80caaa2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/VersionListener.java
@@ -0,0 +1,112 @@
+/*
+ * 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.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidVersion;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.VERSION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * module-header-stmts = ;; these stmts can appear in any order
+ * [yang-version-stmt stmtsep]
+ * namespace-stmt stmtsep
+ * prefix-stmt stmtsep
+ *
+ * submodule-header-stmts =
+ * ;; these stmts can appear in any order
+ * [yang-version-stmt stmtsep]
+ * belongs-to-stmt stmtsep
+ *
+ * yang-version-stmt = yang-version-keyword sep yang-version-arg-str
+ * optsep stmtend
+ *
+ *
+ * ANTLR grammar rule
+ * module_header_statement : yang_version_stmt? namespace_stmt prefix_stmt
+ * | yang_version_stmt? prefix_stmt namespace_stmt
+ * | namespace_stmt yang_version_stmt? prefix_stmt
+ * | namespace_stmt prefix_stmt yang_version_stmt?
+ * | prefix_stmt namespace_stmt yang_version_stmt?
+ * | prefix_stmt yang_version_stmt? namespace_stmt?
+ * ;
+ * submodule_header_statement : yang_version_stmt? belongs_to_stmt
+ * | belongs_to_stmt yang_version_stmt?
+ * ;
+ * yang_version_stmt : YANG_VERSION_KEYWORD version STMTEND;
+ * version : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "version"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class VersionListener {
+
+ /**
+ * Creates a new version listener.
+ */
+ private VersionListener() {
+ }
+
+ /**
+ * It is called when parser receives an input matching the grammar rule
+ * (version), perform validations and update the data model tree.
+ *
+ * @param listener Listener's object
+ * @param ctx context object of the grammar rule
+ */
+ public static void processVersionEntry(TreeWalkListener listener,
+ GeneratedYangParser.YangVersionStatementContext ctx) {
+
+ // Check for stack to be non empty.
+ checkStackIsNotEmpty(listener, MISSING_HOLDER, VERSION_DATA, ctx.version().getText(), ENTRY);
+
+ byte version = getValidVersion(ctx);
+
+ // Obtain the node of the stack.
+ Parsable tmpNode = listener.getParsedDataStack().peek();
+ switch (tmpNode.getYangConstructType()) {
+ case MODULE_DATA: {
+ YangModule module = (YangModule) tmpNode;
+ module.setVersion(version);
+ break;
+ }
+ case SUB_MODULE_DATA: {
+ YangSubModule subModule = (YangSubModule) tmpNode;
+ subModule.setVersion(version);
+ break;
+ }
+ default:
+ throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, VERSION_DATA,
+ ctx.version().getText(), ENTRY));
+ }
+ }
+}