| /* |
| * 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 org.onosproject.yangutils.utils.YangConstructType; |
| |
| 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.removeQuotesAndHandleConcat; |
| import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty; |
| import static org.onosproject.yangutils.utils.YangConstructType.MAX_ELEMENT_DATA; |
| |
| /* |
| * Reference: RFC6020 and YANG ANTLR Grammar |
| * |
| * ABNF grammar as per RFC6020 |
| * max-elements-stmt = max-elements-keyword sep |
| * max-value-arg-str stmtend |
| * max-value-arg-str = < a string that matches the rule |
| * max-value-arg > |
| * |
| * ANTLR grammar rule |
| * maxElementsStatement : MAX_ELEMENTS_KEYWORD maxValue STMTEND; |
| * maxValue : string; |
| */ |
| |
| /** |
| * Represents listener based call back function corresponding to the |
| * "max-elements" rule defined in ANTLR grammar file for corresponding ABNF rule |
| * in RFC 6020. |
| */ |
| public final class MaxElementsListener { |
| |
| private static final String POSITIVE_INTEGER_PATTERN = "[1-9][0-9]*"; |
| private static final String UNBOUNDED_KEYWORD = "unbounded"; |
| |
| /** |
| * Creates a new max-elements listener. |
| */ |
| private MaxElementsListener() { |
| } |
| |
| /** |
| * It is called when parser receives an input matching the grammar rule |
| * (max-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 processMaxElementsEntry(TreeWalkListener listener, |
| GeneratedYangParser.MaxElementsStatementContext ctx) { |
| |
| // Check for stack to be non empty. |
| checkStackIsNotEmpty(listener, MISSING_HOLDER, MAX_ELEMENT_DATA, "", ENTRY); |
| |
| int maxElementsValue = getValidMaxElementValue(ctx); |
| |
| Parsable tmpData = listener.getParsedDataStack().peek(); |
| switch (tmpData.getYangConstructType()) { |
| case LEAF_LIST_DATA: |
| YangLeafList leafList = (YangLeafList) tmpData; |
| leafList.setMaxElelements(maxElementsValue); |
| break; |
| case LIST_DATA: |
| YangList yangList = (YangList) tmpData; |
| yangList.setMaxElements(maxElementsValue); |
| break; |
| default: |
| throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MAX_ELEMENT_DATA, "", ENTRY)); |
| } |
| } |
| |
| /** |
| * Validates max element value and returns the value from context. |
| * |
| * @param ctx context object of the grammar rule |
| * @return max element's value |
| */ |
| private static int getValidMaxElementValue(GeneratedYangParser.MaxElementsStatementContext ctx) { |
| |
| int maxElementsValue; |
| |
| String value = removeQuotesAndHandleConcat(ctx.maxValue().getText()); |
| if (value.equals(UNBOUNDED_KEYWORD)) { |
| maxElementsValue = Integer.MAX_VALUE; |
| } else if (value.matches(POSITIVE_INTEGER_PATTERN)) { |
| maxElementsValue = Integer.parseInt(value); |
| } else { |
| ParserException parserException = new ParserException("YANG file error : " + |
| YangConstructType.getYangConstructType(MAX_ELEMENT_DATA) + " value " + value + " is not " + |
| "valid."); |
| parserException.setLine(ctx.getStart().getLine()); |
| parserException.setCharPosition(ctx.getStart().getCharPositionInLine()); |
| throw parserException; |
| } |
| |
| return maxElementsValue; |
| } |
| } |