| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.skywalking.e2e.assertor; |
| |
| import org.apache.skywalking.e2e.assertor.exception.VariableNotFoundException; |
| |
| import java.util.List; |
| import java.util.function.Function; |
| import java.util.regex.Pattern; |
| |
| import static java.util.Objects.isNull; |
| |
| /** |
| * @author zhangwei |
| */ |
| public class VariableExpressParser { |
| |
| |
| public static <T> T parse(final String express, List<T> actual, Function<T, String> getFiled) { |
| String variable = express.trim(); |
| if (!(variable.startsWith("${") && variable.endsWith("}"))) { |
| return null; |
| } |
| |
| variable = variable.substring(2, variable.length() - 1); |
| |
| int startIndexOfIndex = variable.lastIndexOf("["); |
| String regex = variable.substring(0, startIndexOfIndex); |
| int endIndexOfIndex = variable.indexOf("]", startIndexOfIndex); |
| int expectedIndex = Integer.parseInt(variable.substring(startIndexOfIndex + 1, endIndexOfIndex)); |
| int mappingIndex = 0; |
| |
| T mapping = null; |
| for (T t : actual) { |
| if (Pattern.matches(regex, getFiled.apply(t))) { |
| if (mappingIndex++ == expectedIndex) { |
| mapping = t; |
| break; |
| } |
| } |
| } |
| |
| if (isNull(mapping)) { |
| throw new VariableNotFoundException(express); |
| } |
| return mapping; |
| } |
| } |