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.converters;
  
  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.Task;
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.data.SchemaAndValue;
  import org.apache.kafka.connect.errors.DataException;
  import org.apache.kafka.connect.sink.SinkConnector;
  import org.apache.kafka.connect.storage.Converter;
  import org.apache.kafka.connect.storage.ConverterConfig;
  import org.apache.kafka.connect.storage.HeaderConverter;
  
  import java.nio.ByteBuffer;
  import java.util.List;
  import java.util.Map;
  
  public class ByteArrayConverter implements Converter, HeaderConverter, Versioned {
  
      private static final ConfigDef CONFIG_DEF = ConverterConfig.newConfigDef();
      @Override
      public String version() {
          return AppInfoParser.getVersion();
      }
      @Override
      public ConfigDef config() {
          return CONFIG_DEF;
      }
  
      @Override
      public void configure(Map<String, ?> configs) {
      }
  
      @Override
      public void configure(Map<String, ?> configs, boolean isKey) {
      }
  
      @Override
      public byte[] fromConnectData(String topic, Schema schema, Object value) {
          if (schema != null && schema.type() != Schema.Type.BYTES)
              throw new DataException("Invalid schema type for ByteArrayConverter: " + schema.type().toString());
  
          if (value != null && !(value instanceof byte[]) && !(value instanceof ByteBuffer))
              throw new DataException("ByteArrayConverter is not compatible with objects of type " + value.getClass());
  
          return value instanceof ByteBuffer ? getBytesFromByteBuffer((ByteBuffer) value) : (byte[]) value;
      }
  
      @Override
      public SchemaAndValue toConnectData(String topic, byte[] value) {
          return new SchemaAndValue(Schema.OPTIONAL_BYTES_SCHEMA, value);
      }
  
      @Override
      public byte[] fromConnectHeader(String topic, String headerKey, Schema schema, Object value) {
          return fromConnectData(topic, schema, value);
      }
  
      @Override
      public SchemaAndValue toConnectHeader(String topic, String headerKey, byte[] value) {
          return toConnectData(topic, value);
      }
  
      @Override
      public void close() {
          // do nothing
      }
  
      private byte[] getBytesFromByteBuffer(ByteBuffer byteBuffer) {
          if (byteBuffer == null) {
              return null;
          }
  
          byteBuffer.rewind();
          byte[] bytes = new byte[byteBuffer.remaining()];
          byteBuffer.get(bytes);
          return bytes;
      }
  }
  