| /* |
| * 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.YangReference; |
| import org.onosproject.yangutils.parser.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.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; |
| import static org.onosproject.yangutils.utils.YangConstructType.REFERENCE_DATA; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * reference-stmt = reference-keyword sep string optsep stmtend |
| * |
| * ANTLR grammar rule |
| * referenceStatement : REFERENCE_KEYWORD string STMTEND; |
| */ |
| |
| /** |
| * Represents listener based call back function corresponding to the "reference" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| public final class ReferenceListener { |
| |
| /** |
| * Creates a new reference listener. |
| */ |
| private ReferenceListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar |
| * rule (reference), performs validation and updates the data model |
| * tree. |
| * |
| * @param listener listener's object |
| * @param ctx context object of the grammar rule |
| */ |
| public static void processReferenceEntry(TreeWalkListener listener, |
| GeneratedYangParser.ReferenceStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, REFERENCE_DATA, ctx.string().getText(), ENTRY); |
| |
| Parsable tmpData = listener.getParsedDataStack().peek(); |
| if (tmpData instanceof YangReference) { |
| YangReference reference = (YangReference) tmpData; |
| reference.setReference(ctx.string().getText()); |
| } else { |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, REFERENCE_DATA, |
| ctx.string().getText(), ENTRY)); |
| } |
| } |
| } |