| /* |
| * 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.YangLeafList; |
| import org.onosproject.yangutils.datamodel.YangList; |
| 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.getValidNonNegativeIntegerValue; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty; |
| import static org.onosproject.yangutils.utils.YangConstructType.MIN_ELEMENT_DATA; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * min-elements-stmt = min-elements-keyword sep |
| * min-value-arg-str stmtend |
| * min-value-arg-str = < a string that matches the rule |
| * min-value-arg > |
| * min-value-arg = non-negative-integer-value |
| * |
| * ANTLR grammar rule |
| * minElementsStatement : MIN_ELEMENTS_KEYWORD minValue STMTEND; |
| * minValue : string; |
| */ |
| |
| /** |
| * Represents listener based call back function corresponding to the "min-elements" |
| * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020. |
| */ |
| public final class MinElementsListener { |
| |
| /** |
| * Creates a new min-elements listener. |
| */ |
| private MinElementsListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar |
| * rule (min-elements), performs validation and updates the data model |
| * tree. |
| * |
| * @param listener listener's object |
| * @param ctx context object of the grammar rule |
| */ |
| public static void processMinElementsEntry(TreeWalkListener listener, |
| GeneratedYangParser.MinElementsStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, MIN_ELEMENT_DATA, ctx.minValue().getText(), ENTRY); |
| |
| int minElementValue = getValidNonNegativeIntegerValue(ctx.minValue().getText(), MIN_ELEMENT_DATA, ctx); |
| |
| Parsable tmpData = listener.getParsedDataStack().peek(); |
| switch (tmpData.getYangConstructType()) { |
| case LEAF_LIST_DATA: |
| YangLeafList leafList = (YangLeafList) tmpData; |
| leafList.setMinElements(minElementValue); |
| break; |
| case LIST_DATA: |
| YangList yangList = (YangList) tmpData; |
| yangList.setMinElements(minElementValue); |
| break; |
| default: |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MIN_ELEMENT_DATA, |
| ctx.minValue().getText(), ENTRY)); |
| } |
| } |
| } |