| /* |
| * 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.datamodel.YangImport; |
| import org.onosproject.yangutils.datamodel.YangModule; |
| import org.onosproject.yangutils.datamodel.YangSubModule; |
| 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.ListenerUtil.getValidIdentifier; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT; |
| 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_CURRENT_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.IMPORT_DATA; |
| |
| /* |
| * 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) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(), ENTRY); |
| |
| String identifier = getValidIdentifier(ctx.identifier().getText(), IMPORT_DATA, ctx); |
| |
| YangImport importNode = new YangImport(); |
| importNode.setModuleName(identifier); |
| |
| // Push import node to the stack. |
| listener.getParsedDataStack().push(importNode); |
| } |
| |
| /** |
| * 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) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(), EXIT); |
| |
| Parsable tmpImportNode = listener.getParsedDataStack().peek(); |
| if (tmpImportNode instanceof YangImport) { |
| listener.getParsedDataStack().pop(); |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(), |
| EXIT); |
| |
| Parsable tmpNode = listener.getParsedDataStack().peek(); |
| switch (tmpNode.getYangConstructType()) { |
| case MODULE_DATA: { |
| YangModule module = (YangModule) tmpNode; |
| module.addToImportList((YangImport) tmpImportNode); |
| break; |
| } |
| case SUB_MODULE_DATA: { |
| YangSubModule subModule = (YangSubModule) tmpNode; |
| subModule.addToImportList((YangImport) tmpImportNode); |
| break; |
| } |
| default: |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, IMPORT_DATA, |
| ctx.identifier().getText(), |
| EXIT)); |
| } |
| } else { |
| throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, IMPORT_DATA, |
| ctx.identifier().getText(), EXIT)); |
| } |
| } |
| } |