| /* |
| * 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.YangLeafRef; |
| import org.onosproject.yangutils.datamodel.utils.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.ListenerErrorMessageConstruction.constructListenerErrorMessage; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.validatePathArgument; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty; |
| import static org.onosproject.yangutils.datamodel.utils.YangConstructType.PATH_DATA; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * leafref-specification = |
| * ;; these stmts can appear in any order |
| * path-stmt stmtsep |
| * [require-instance-stmt stmtsep] |
| * |
| * path-stmt = path-keyword sep path-arg-str stmtend |
| * |
| * ANTLR grammar rule |
| * |
| * leafrefSpecification : (pathStatement (requireInstanceStatement)?) | ((requireInstanceStatement)? pathStatement); |
| * |
| * pathStatement : PATH_KEYWORD path STMTEND; |
| */ |
| |
| /** |
| * Represents listener based call back function corresponding to the |
| * "path" rule defined in ANTLR grammar file for corresponding ABNF rule |
| * in RFC 6020. |
| */ |
| public final class PathListener { |
| |
| /** |
| * Creates a new path listener. |
| */ |
| private PathListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar rule |
| * (path), performs validation and updates the data model tree. |
| * |
| * @param listener listener's object |
| * @param ctx context object of the grammar rule |
| */ |
| public static void processPathEntry(TreeWalkListener listener, |
| GeneratedYangParser.PathStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, PATH_DATA, ctx.path().getText(), ENTRY); |
| |
| Parsable curData = listener.getParsedDataStack().peek(); |
| |
| // Checks the holder of path as leafref, else throws error. |
| if (curData instanceof YangLeafRef) { |
| |
| // Splitting the path argument and updating it in the datamodel tree. |
| validatePathArgument(ctx.path().getText(), PATH_DATA, ctx, (YangLeafRef) curData); |
| } else { |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, PATH_DATA, |
| ctx.path().getText(), ENTRY)); |
| } |
| } |
| } |