Gaurav Agrawal | b5a1c13 | 2016-02-21 02:56:46 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2014-2016 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.yangutils.parser.impl.listeners; |
| 18 | |
| 19 | /* |
| 20 | * Reference: RFC6020 and YANG ANTLR Grammar |
| 21 | * |
| 22 | * body-stmts = *((extension-stmt / |
| 23 | * feature-stmt / |
| 24 | * identity-stmt / |
| 25 | * typedef-stmt / |
| 26 | * grouping-stmt / |
| 27 | * data-def-stmt / |
| 28 | * augment-stmt / |
| 29 | * rpc-stmt / |
| 30 | * notification-stmt / |
| 31 | * deviation-stmt) stmtsep) |
| 32 | * |
| 33 | * typedef-stmt = typedef-keyword sep identifier-arg-str optsep |
| 34 | * "{" stmtsep |
| 35 | * ;; these stmts can appear in any order |
| 36 | * type-stmt stmtsep |
| 37 | * [units-stmt stmtsep] |
| 38 | * [default-stmt stmtsep] |
| 39 | * [status-stmt stmtsep] |
| 40 | * [description-stmt stmtsep] |
| 41 | * [reference-stmt stmtsep] |
| 42 | * "}" |
| 43 | * |
| 44 | * ANTLR grammar rule |
| 45 | * typedefStatement : TYPEDEF_KEYWORD IDENTIFIER LEFT_CURLY_BRACE |
| 46 | * (typeStatement | unitsStatement | defaultStatement | statusStatement |
| 47 | * | descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE; |
| 48 | */ |
| 49 | |
| 50 | import org.onosproject.yangutils.datamodel.YangContainer; |
| 51 | import org.onosproject.yangutils.datamodel.YangList; |
| 52 | import org.onosproject.yangutils.datamodel.YangModule; |
| 53 | import org.onosproject.yangutils.datamodel.YangNode; |
| 54 | import org.onosproject.yangutils.datamodel.YangSubModule; |
| 55 | import org.onosproject.yangutils.datamodel.YangTypeDef; |
| 56 | import org.onosproject.yangutils.datamodel.exceptions.DataModelException; |
| 57 | import org.onosproject.yangutils.parser.Parsable; |
| 58 | import org.onosproject.yangutils.parser.ParsableDataType; |
| 59 | import static org.onosproject.yangutils.parser.ParsableDataType.TYPEDEF_DATA; |
| 60 | import static org.onosproject.yangutils.parser.ParsableDataType.UNITS_DATA; |
| 61 | import static org.onosproject.yangutils.parser.ParsableDataType.DEFAULT_DATA; |
| 62 | import static org.onosproject.yangutils.parser.ParsableDataType.TYPE_DATA; |
| 63 | import static org.onosproject.yangutils.parser.ParsableDataType.DESCRIPTION_DATA; |
| 64 | import static org.onosproject.yangutils.parser.ParsableDataType.REFERENCE_DATA; |
| 65 | import static org.onosproject.yangutils.parser.ParsableDataType.STATUS_DATA; |
| 66 | import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser; |
| 67 | import org.onosproject.yangutils.parser.exceptions.ParserException; |
| 68 | import org.onosproject.yangutils.parser.impl.TreeWalkListener; |
| 69 | import org.onosproject.yangutils.parser.impl.YangUtilsParserManager; |
| 70 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY; |
| 71 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT; |
| 72 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage; |
| 73 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage; |
| 74 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER; |
| 75 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_CARDINALITY; |
| 76 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER; |
| 77 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA; |
| 78 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER; |
| 79 | import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty; |
| 80 | |
| 81 | /** |
| 82 | * Implements listener based call back function corresponding to the "typedef" |
| 83 | * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| 84 | */ |
| 85 | public final class TypeDefListener { |
| 86 | |
| 87 | private static ParsableDataType yangConstruct; |
| 88 | |
| 89 | /** |
| 90 | * Creates a new typedef listener. |
| 91 | */ |
| 92 | private TypeDefListener() { |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * It is called when parser enters grammar rule (typedef), it perform |
| 97 | * validations and updates the data model tree. |
| 98 | * |
| 99 | * @param listener listener's object. |
| 100 | * @param ctx context object of the grammar rule. |
| 101 | */ |
| 102 | public static void processTypeDefEntry(TreeWalkListener listener, |
| 103 | GeneratedYangParser.TypedefStatementContext ctx) { |
| 104 | |
| 105 | // Check for stack to be non empty. |
| 106 | checkStackIsNotEmpty(listener, MISSING_HOLDER, TYPEDEF_DATA, ctx.IDENTIFIER().getText(), ENTRY); |
| 107 | |
| 108 | boolean result = validateSubStatementsCardinality(ctx); |
| 109 | if (!result) { |
| 110 | throw new ParserException(constructListenerErrorMessage(INVALID_CARDINALITY, yangConstruct, "", ENTRY)); |
| 111 | } |
| 112 | |
| 113 | YangTypeDef typeDefNode = new YangTypeDef(); |
| 114 | typeDefNode.setDerivedName(ctx.IDENTIFIER().getText()); |
| 115 | |
| 116 | Parsable curData = listener.getParsedDataStack().peek(); |
| 117 | |
| 118 | if (curData instanceof YangModule | curData instanceof YangSubModule | curData instanceof YangContainer |
| 119 | | curData instanceof YangList) { |
| 120 | /* |
| 121 | * TODO YangGrouping, YangRpc, YangInput, YangOutput, Notification. |
| 122 | */ |
| 123 | YangNode curNode = (YangNode) curData; |
| 124 | try { |
| 125 | curNode.addChild(typeDefNode); |
| 126 | } catch (DataModelException e) { |
| 127 | throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA, |
| 128 | TYPEDEF_DATA, ctx.IDENTIFIER().getText(), ENTRY, e.getMessage())); |
| 129 | } |
| 130 | listener.getParsedDataStack().push(typeDefNode); |
| 131 | } else { |
| 132 | throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, |
| 133 | TYPEDEF_DATA, ctx.IDENTIFIER().getText(), ENTRY)); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * It is called when parser exits from grammar rule (typedef), it perform |
| 139 | * validations and updates the data model tree. |
| 140 | * |
| 141 | * @param listener listener's object. |
| 142 | * @param ctx context object of the grammar rule. |
| 143 | */ |
| 144 | public static void processTypeDefExit(TreeWalkListener listener, |
| 145 | GeneratedYangParser.TypedefStatementContext ctx) { |
| 146 | |
| 147 | // Check for stack to be non empty. |
| 148 | checkStackIsNotEmpty(listener, MISSING_HOLDER, TYPEDEF_DATA, ctx.IDENTIFIER().getText(), EXIT); |
| 149 | |
| 150 | if (listener.getParsedDataStack().peek() instanceof YangTypeDef) { |
| 151 | listener.getParsedDataStack().pop(); |
| 152 | } else { |
| 153 | listener.getErrorInformation().setErrorFlag(true); |
| 154 | throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, TYPEDEF_DATA, |
| 155 | ctx.IDENTIFIER().getText(), EXIT)); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Validates the cardinality of typedef sub-statements as per grammar. |
| 161 | * |
| 162 | * @param ctx context object of the grammar rule. |
| 163 | * @return true/false validation success or failure. |
| 164 | */ |
| 165 | private static boolean validateSubStatementsCardinality(GeneratedYangParser.TypedefStatementContext ctx) { |
| 166 | |
| 167 | if ((!ctx.unitsStatement().isEmpty()) |
| 168 | && (ctx.unitsStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| 169 | yangConstruct = UNITS_DATA; |
| 170 | return false; |
| 171 | } |
| 172 | |
| 173 | if ((!ctx.defaultStatement().isEmpty()) |
| 174 | && (ctx.defaultStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| 175 | yangConstruct = DEFAULT_DATA; |
| 176 | return false; |
| 177 | } |
| 178 | |
| 179 | if (ctx.typeStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY) { |
| 180 | yangConstruct = TYPE_DATA; |
| 181 | return false; |
| 182 | } |
| 183 | |
| 184 | if ((!ctx.descriptionStatement().isEmpty()) |
| 185 | && (ctx.descriptionStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| 186 | yangConstruct = DESCRIPTION_DATA; |
| 187 | return false; |
| 188 | } |
| 189 | |
| 190 | if ((!ctx.referenceStatement().isEmpty()) |
| 191 | && (ctx.referenceStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| 192 | yangConstruct = REFERENCE_DATA; |
| 193 | return false; |
| 194 | } |
| 195 | |
| 196 | if ((!ctx.statusStatement().isEmpty()) |
| 197 | && (ctx.statusStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| 198 | yangConstruct = STATUS_DATA; |
| 199 | return false; |
| 200 | } |
| 201 | return true; |
| 202 | } |
| 203 | } |