code: /*
   * 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.oap.server.library.util;
  
  import java.util.ArrayList;
  import java.util.Comparator;
  import java.util.List;
  import java.util.regex.Pattern;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.ToString;
  
  /**
   * Group patterns use {@link java.util.regex.Pattern} as core, could group the input strings to matched group or return
   * original string.
   */
  @ToString
  public class StringFormatGroup {
      private final List<PatternRule> rules;
  
      public StringFormatGroup() {
          rules = new ArrayList<>();
      }
  
      public StringFormatGroup(int size) {
          rules = new ArrayList<>(size);
      }
  
      /**
       * Add a new match rule. The rule will follow the order of being added.
       *
       * @param name      will be used when ruleRegex matched.
       * @param ruleRegex to match target string.
       */
      public void addRule(String name, String ruleRegex) {
          for (PatternRule rule : rules) {
              if (rule.name.equals(name)) {
                  return;
              }
          }
          PatternRule rule = new PatternRule(name, ruleRegex);
          rules.add(rule);
      }
  
      /**
       * Format the string based on rules.
       *
       * @param string to be formatted
       * @return matched rule name, or original string.
       */
      public FormatResult format(String string) {
          for (PatternRule rule : rules) {
              if (rule.getPattern().matcher(string).matches()) {
                  return new FormatResult(true, string, rule.getName());
              }
          }
          return new FormatResult(false, string, string);
      }
  
      public void sortRules(Comparator<? super PatternRule> comparator) {
          rules.sort(comparator);
      }
  
      @Getter
      @RequiredArgsConstructor
      @EqualsAndHashCode
      @ToString
      public static class FormatResult {
          private final boolean match;
          private final String name;
          private final String replacedName;
      }
  
      @Getter
      @ToString
      public static class PatternRule {
          private final String name;
          private final Pattern pattern;
  
          private PatternRule(String name, String ruleRegex) {
              this.name = name;
              pattern = Pattern.compile(ruleRegex);
          }
      }
  }
  