| /* |
| * 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.YangModule; |
| import org.onosproject.yangutils.datamodel.YangNameSpace; |
| import org.onosproject.yangutils.parser.Parsable; |
| import org.onosproject.yangutils.parser.ParsableDataType; |
| import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser; |
| import org.onosproject.yangutils.parser.exceptions.ParserException; |
| import org.onosproject.yangutils.parser.impl.TreeWalkListener; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType; |
| import org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation; |
| |
| import java.net.URI; |
| |
| /* |
| * 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 |
| * |
| * namespace-stmt = namespace-keyword sep uri-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 |
| * ; |
| * namespace_stmt : NAMESPACE_KEYWORD string STMTEND; |
| */ |
| |
| /** |
| * Implements listener based call back function corresponding to the "namespace" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| public final class NamespaceListener { |
| |
| /** |
| * Creates a new namespace listener. |
| */ |
| private NamespaceListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar |
| * rule (namespace), perform validations and update the data model |
| * tree. |
| * |
| * @param listener Listener's object. |
| * @param ctx context object of the grammar rule. |
| */ |
| public static void processNamespaceEntry(TreeWalkListener listener, |
| GeneratedYangParser.NamespaceStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER, |
| ParsableDataType.NAMESPACE_DATA, |
| String.valueOf(ctx.string().getText()), ListenerErrorLocation.ENTRY); |
| |
| if (!validateUriValue(String.valueOf(ctx.string().getText()))) { |
| ParserException parserException = new ParserException("Invalid namespace URI"); |
| parserException.setLine(ctx.string().STRING(0).getSymbol().getLine()); |
| parserException.setCharPosition(ctx.string().STRING(0).getSymbol().getCharPositionInLine()); |
| throw parserException; |
| } |
| |
| // Obtain the node of the stack. |
| Parsable tmpNode = listener.getParsedDataStack().peek(); |
| switch (tmpNode.getParsableDataType()) { |
| case MODULE_DATA: { |
| YangModule module = (YangModule) tmpNode; |
| YangNameSpace uri = new YangNameSpace(); |
| uri.setUri(String.valueOf(ctx.string().getText())); |
| module.setNameSpace(uri); |
| break; |
| } |
| default: |
| throw new ParserException( |
| ListenerErrorMessageConstruction |
| .constructListenerErrorMessage(ListenerErrorType.INVALID_HOLDER, |
| ParsableDataType.NAMESPACE_DATA, |
| String.valueOf(ctx.string().getText()), |
| ListenerErrorLocation.ENTRY)); |
| } |
| } |
| |
| /** |
| * Validate input URI. |
| * |
| * @param uri input namespace URI |
| * @return validation result |
| */ |
| private static boolean validateUriValue(String uri) { |
| uri = uri.replace("\"", ""); |
| final URI tmpUri; |
| try { |
| tmpUri = URI.create(uri); |
| } catch (Exception e1) { |
| return false; |
| } |
| return true; |
| } |
| } |