[ONOS-3882, 3883, 3892]Implement Yang container, list, leaf, leaf-list parsing
Change-Id: I39039c91385fe0d530d037350ef7833c2459514d
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListener.java
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+/*
+ * 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
+ * leaf-list-stmt = leaf-list-keyword sep identifier-arg-str optsep
+ * "{" stmtsep
+ * ;; these stmts can appear in any order
+ * [when-stmt stmtsep]
+ * *(if-feature-stmt stmtsep)
+ * type-stmt stmtsep
+ * [units-stmt stmtsep]
+ * *(must-stmt stmtsep)
+ * [config-stmt stmtsep]
+ * [min-elements-stmt stmtsep]
+ * [max-elements-stmt stmtsep]
+ * [ordered-by-stmt stmtsep]
+ * [status-stmt stmtsep]
+ * [description-stmt stmtsep]
+ * [reference-stmt stmtsep]
+ * "}"
+ *
+ * ANTLR grammar rule
+ * leafListStatement : LEAF_LIST_KEYWORD IDENTIFIER LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement |
+ * typeStatement | unitsStatement | mustStatement | configStatement | minElementsStatement | maxElementsStatement |
+ * orderedByStatement | statusStatement | descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Implements listener based call back function corresponding to the "leaf-list"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class LeafListListener {
+
+ /**
+ * Creates a new leaf list listener.
+ */
+ private LeafListListener() {
+ }
+
+ /**
+ * It is called when parser receives an input matching the grammar
+ * rule (leaf-list), performs validation and updates the data model
+ * tree.
+ *
+ * @param listener listener's object.
+ * @param ctx context object of the grammar rule.
+ */
+ public static void processLeafListEntry(TreeWalkListener listener,
+ GeneratedYangParser.LeafListStatementContext ctx) {
+ // TODO method implementation
+ }
+
+ /**
+ * It is called when parser exits from grammar rule (leaf-list), it performs
+ * validation and updates the data model tree.
+ *
+ * @param listener listener's object.
+ * @param ctx context object of the grammar rule.
+ */
+ public static void processLeafListExit(TreeWalkListener listener,
+ GeneratedYangParser.LeafListStatementContext ctx) {
+ // TODO method implementation
+ }
+}
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