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.analysis.manual.searchtag;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.stream.Collectors;
  import lombok.AllArgsConstructor;
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.NoArgsConstructor;
  import lombok.Setter;
  import org.apache.skywalking.oap.server.library.util.CollectionUtils;
  
  @Getter
  @Setter
  @EqualsAndHashCode
  @NoArgsConstructor
  @AllArgsConstructor
  public class Tag {
      public static final int TAG_LENGTH = 256;
      private String key;
      private String value;
  
      @Override
      public String toString() {
          return key + "=" + value;
      }
  
      public static class Util {
          public static List<String> toStringList(List<Tag> list) {
              if (CollectionUtils.isEmpty(list)) {
                  return Collections.emptyList();
              }
              return list.stream().map(Tag::toString).collect(Collectors.toList());
          }
      }
  }
  