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.core.config.group.uri.quickmatch;
  
  import java.util.List;
  
  public interface PatternToken {
      boolean isMatch(String name);
  
      boolean isLeaf();
  
      String expression();
  
      void setExpression(String expression);
  
      List<PatternToken> children();
  
      default PatternToken find(final PatternToken token) {
          for (final PatternToken child : children()) {
              if (child.equals(token)) {
                  return child;
              }
          }
          return null;
      }
  
      default PatternToken add(final PatternToken token) {
          children().add(token);
          return token;
      }
  }
  