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.analyzer.agent.kafka.provider.handler;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  import org.apache.skywalking.oap.server.analyzer.agent.kafka.module.KafkaFetcherConfig;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  
  public abstract class AbstractKafkaHandler implements KafkaHandler {
      protected KafkaFetcherConfig config;
  
      public AbstractKafkaHandler(ModuleManager manager, KafkaFetcherConfig config) {
          this.config = config;
      }
  
      @Override
      public String getTopic() {
          StringBuilder sb = new StringBuilder();
          if (StringUtils.isNotBlank(config.getMm2SourceAlias())) {
              sb.append(config.getMm2SourceAlias()).append(config.getMm2SourceSeparator());
          }
  
          if (StringUtil.isNotBlank(config.getNamespace())) {
              sb.append(config.getNamespace()).append("-");
          }
          sb.append(getPlainTopic());
          return sb.toString();
      }
  
      protected abstract String getPlainTopic();
  }
  