| /* |
| * 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.YangBelongsTo; |
| import org.onosproject.yangutils.datamodel.YangImport; |
| import org.onosproject.yangutils.datamodel.YangModule; |
| 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.ListenerUtil.getValidIdentifier; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty; |
| import static org.onosproject.yangutils.utils.YangConstructType.PREFIX_DATA; |
| |
| /* |
| * 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 |
| * |
| * prefix-stmt = prefix-keyword sep prefix-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 |
| * ; |
| * prefix_stmt : PREFIX_KEYWORD identifier STMTEND; |
| */ |
| |
| /** |
| * Represents listener based call back function corresponding to the "prefix" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| public final class PrefixListener { |
| |
| /** |
| * Creates a new prefix listener. |
| */ |
| private PrefixListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar rule |
| * (prefix),perform validations and update the data model tree. |
| * |
| * @param listener Listener's object |
| * @param ctx context object of the grammar rule |
| */ |
| public static void processPrefixEntry(TreeWalkListener listener, GeneratedYangParser.PrefixStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, PREFIX_DATA, ctx.identifier().getText(), ENTRY); |
| |
| String identifier = getValidIdentifier(ctx.identifier().getText(), PREFIX_DATA, ctx); |
| |
| // Obtain the node of the stack. |
| Parsable tmpNode = listener.getParsedDataStack().peek(); |
| switch (tmpNode.getYangConstructType()) { |
| case MODULE_DATA: { |
| YangModule module = (YangModule) tmpNode; |
| module.setPrefix(identifier); |
| break; |
| } |
| case IMPORT_DATA: { |
| YangImport importNode = (YangImport) tmpNode; |
| importNode.setPrefixId(identifier); |
| break; |
| } |
| case BELONGS_TO_DATA: { |
| YangBelongsTo belongstoNode = (YangBelongsTo) tmpNode; |
| belongstoNode.setPrefix(identifier); |
| break; |
| } |
| default: |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, PREFIX_DATA, |
| ctx.identifier().getText(), ENTRY)); |
| } |
| } |
| } |