| /* |
| * 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. |
| */ |
| |
| /** |
| * Implements listener based call back function corresponding to the "leaf" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| package org.onosproject.yangutils.parser.impl.listeners; |
| |
| import org.onosproject.yangutils.datamodel.YangLeaf; |
| 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.datamodel.YangLeavesHolder; |
| import org.onosproject.yangutils.parser.impl.YangUtilsParserManager; |
| 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; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * leaf-stmt = leaf-keyword sep identifier-arg-str optsep |
| * "{" stmtsep |
| * ;; these stmts can appear in any order |
| * [when-stmt stmtsep] |
| * *(if-feature-stmt stmtsep) |
| * type-stmt stmtsep |
| * [units-stmt stmtsep] |
| * *(must-stmt stmtsep) |
| * [default-stmt stmtsep] |
| * [config-stmt stmtsep] |
| * [mandatory-stmt stmtsep] |
| * [status-stmt stmtsep] |
| * [description-stmt stmtsep] |
| * [reference-stmt stmtsep] |
| * "}" |
| * |
| * ANTLR grammar rule |
| * leafStatement : LEAF_KEYWORD IDENTIFIER LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | typeStatement | |
| * unitsStatement | mustStatement | defaultStatement | configStatement | mandatoryStatement | statusStatement | |
| * descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE; |
| */ |
| |
| /** |
| * Implements listener based call back function corresponding to the "leaf" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| public final class LeafListener { |
| |
| private static ParsableDataType yangConstruct; |
| |
| /** |
| * Creates a new leaf listener. |
| */ |
| private LeafListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar |
| * rule (leaf), performs validation and updates the data model |
| * tree. |
| * |
| * @param listener listener's object. |
| * @param ctx context object of the grammar rule. |
| */ |
| public static void processLeafEntry(TreeWalkListener listener, |
| GeneratedYangParser.LeafStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER, |
| ParsableDataType.LEAF_DATA, String.valueOf(ctx.IDENTIFIER().getText()), |
| ListenerErrorLocation.ENTRY); |
| |
| boolean result = validateSubStatementsCardinality(ctx); |
| if (!result) { |
| throw new ParserException(ListenerErrorMessageConstruction |
| .constructListenerErrorMessage(ListenerErrorType.INVALID_CARDINALITY, |
| yangConstruct, "", ListenerErrorLocation.ENTRY)); |
| } |
| |
| YangLeaf leaf = new YangLeaf(); |
| leaf.setLeafName(ctx.IDENTIFIER().getText()); |
| |
| Parsable tmpData = listener.getParsedDataStack().peek(); |
| YangLeavesHolder leaves; |
| |
| if (tmpData instanceof YangLeavesHolder) { |
| leaves = (YangLeavesHolder) tmpData; |
| leaves.addLeaf(leaf); |
| } else { |
| throw new ParserException(ListenerErrorMessageConstruction |
| .constructListenerErrorMessage(ListenerErrorType.INVALID_HOLDER, |
| ParsableDataType.LEAF_DATA, |
| String.valueOf(ctx.IDENTIFIER().getText()), |
| ListenerErrorLocation.ENTRY)); |
| } |
| |
| listener.getParsedDataStack().push(leaf); |
| } |
| |
| /** |
| * It is called when parser exits from grammar rule (leaf), performs |
| * validation and updates the data model tree. |
| * |
| * @param listener listener's object. |
| * @param ctx context object of the grammar rule. |
| */ |
| public static void processLeafExit(TreeWalkListener listener, |
| GeneratedYangParser.LeafStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| ListenerValidation.checkStackIsNotEmpty(listener, ListenerErrorType.MISSING_HOLDER, |
| ParsableDataType.LEAF_DATA, String.valueOf(ctx.IDENTIFIER().getText()), |
| ListenerErrorLocation.EXIT); |
| |
| if (listener.getParsedDataStack().peek() instanceof YangLeaf) { |
| listener.getParsedDataStack().pop(); |
| } else { |
| throw new ParserException(ListenerErrorMessageConstruction |
| .constructListenerErrorMessage(ListenerErrorType.INVALID_HOLDER, |
| ParsableDataType.LEAF_DATA, |
| String.valueOf(ctx.IDENTIFIER().getText()), |
| ListenerErrorLocation.EXIT)); |
| } |
| } |
| |
| /** |
| * Validates the cardinality of leaf sub-statements as per grammar. |
| * |
| * @param ctx context object of the grammar rule. |
| * @return true/false validation success or failure. |
| */ |
| public static boolean validateSubStatementsCardinality(GeneratedYangParser |
| .LeafStatementContext ctx) { |
| |
| if (ctx.typeStatement().isEmpty() |
| || (ctx.typeStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.TYPE_DATA; |
| return false; |
| } |
| |
| if ((!ctx.unitsStatement().isEmpty()) |
| && (ctx.unitsStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.UNITS_DATA; |
| return false; |
| } |
| |
| if ((!ctx.configStatement().isEmpty()) |
| && (ctx.configStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.CONFIG_DATA; |
| return false; |
| } |
| |
| if ((!ctx.mandatoryStatement().isEmpty()) |
| && (ctx.mandatoryStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.MANDATORY_DATA; |
| return false; |
| } |
| |
| if ((!ctx.descriptionStatement().isEmpty()) |
| && (ctx.descriptionStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.DESCRIPTION_DATA; |
| return false; |
| } |
| |
| if ((!ctx.referenceStatement().isEmpty()) |
| && (ctx.referenceStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.REFERENCE_DATA; |
| return false; |
| } |
| |
| if ((!ctx.statusStatement().isEmpty()) |
| && (ctx.statusStatement().size() != YangUtilsParserManager.SUB_STATEMENT_CARDINALITY)) { |
| yangConstruct = ParsableDataType.STATUS_DATA; |
| return false; |
| } |
| |
| return true; |
| } |
| } |