content: /*
   * 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.kafka.connect.transforms;
  
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.common.utils.AppInfoParser;
  import org.apache.kafka.connect.components.Versioned;
  import org.apache.kafka.connect.connector.ConnectRecord;
  import org.apache.kafka.connect.data.SchemaAndValue;
  import org.apache.kafka.connect.data.Values;
  import org.apache.kafka.connect.header.Headers;
  import org.apache.kafka.connect.transforms.util.SimpleConfig;
  
  import java.util.Map;
  
  import static org.apache.kafka.common.config.ConfigDef.NO_DEFAULT_VALUE;
  
  public class InsertHeader<R extends ConnectRecord<R>> implements Transformation<R>, Versioned {
  
      public static final String OVERVIEW_DOC =
              "Add a header to each record.";
  
      public static final String HEADER_FIELD = "header";
      public static final String VALUE_LITERAL_FIELD = "value.literal";
  
      public static final ConfigDef CONFIG_DEF = new ConfigDef()
              .define(HEADER_FIELD, ConfigDef.Type.STRING,
                      NO_DEFAULT_VALUE, new ConfigDef.NonNullValidator(),
                      ConfigDef.Importance.HIGH,
                      "The name of the header.")
              .define(VALUE_LITERAL_FIELD, ConfigDef.Type.STRING,
                      NO_DEFAULT_VALUE, new ConfigDef.NonNullValidator(),
                      ConfigDef.Importance.HIGH,
                      "The literal value that is to be set as the header value on all records.");
  
      private String header;
  
      private SchemaAndValue literalValue;
  
      @Override
      public R apply(R record) {
          Headers updatedHeaders = record.headers().duplicate();
          updatedHeaders.add(header, literalValue);
          return record.newRecord(record.topic(), record.kafkaPartition(), record.keySchema(), record.key(),
                  record.valueSchema(), record.value(), record.timestamp(), updatedHeaders);
      }
  
      @Override
      public String version() {
          return AppInfoParser.getVersion();
      }
  
  
      @Override
      public ConfigDef config() {
          return CONFIG_DEF;
      }
  
      @Override
      public void close() {
  
      }
  
      @Override
      public void configure(Map<String, ?> props) {
          final SimpleConfig config = new SimpleConfig(CONFIG_DEF, props);
          header = config.getString(HEADER_FIELD);
          literalValue = Values.parseString(config.getString(VALUE_LITERAL_FIELD));
      }
  }
  