utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListener.java

/*
 * 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
 *  container-stmt      = container-keyword sep identifier-arg-str optsep
 *                        (";" /
 *                         "{" stmtsep
 *                             ;; these stmts can appear in any order
 *                             [when-stmt stmtsep]
 *                             *(if-feature-stmt stmtsep)
 *                             *(must-stmt stmtsep)
 *                             [presence-stmt stmtsep]
 *                             [config-stmt stmtsep]
 *                             [status-stmt stmtsep]
 *                             [description-stmt stmtsep]
 *                             [reference-stmt stmtsep]
 *                             *((typedef-stmt /
 *                                grouping-stmt) stmtsep)
 *                             *(data-def-stmt stmtsep)
 *                         "}")
 *
 * ANTLR grammar rule
 *  containerStatement : CONTAINER_KEYWORD IDENTIFIER
 *                   (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | mustStatement |
 *                   presenceStatement | configStatement | statusStatement | descriptionStatement |
 *                   referenceStatement | typedefStatement | groupingStatement
 *                    | dataDefStatement)* RIGHT_CURLY_BRACE);
 */

/**
 * Implements listener based call back function corresponding to the "container"
 * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
 */
public final class ContainerListener {

    /**
     * Creates a new container listener.
     */
    private ContainerListener() {
    }

    /**
     * It is called when parser receives an input matching the grammar
     * rule (container), performs validation and updates the data model
     * tree.
     *
     * @param listener listener's object.
     * @param ctx context object of the grammar rule.
     */
    public static void processContainerEntry(TreeWalkListener listener,
                                             GeneratedYangParser.ContainerStatementContext ctx) {
        // TODO method implementation
    }

    /**
     * It is called when parser exits from grammar rule (container), it perform
     * validations and updates the data model tree.
     *
     * @param listener listener's object.
     * @param ctx context object of the grammar rule.
     */
    public static void processContainerExit(TreeWalkListener listener,
                                            GeneratedYangParser.ContainerStatementContext ctx) {
        //TODO method implementation
    }
}