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.camel.kafkaconnector.transforms;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.util.Map;
  
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.fasterxml.jackson.databind.ObjectReader;
  import com.fasterxml.jackson.dataformat.avro.AvroFactory;
  import com.fasterxml.jackson.dataformat.avro.AvroSchema;
  import io.apicurio.registry.utils.converter.avro.AvroData;
  import io.apicurio.registry.utils.converter.avro.AvroDataConfig;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.generic.GenericRecord;
  import org.apache.avro.io.Encoder;
  import org.apache.avro.io.EncoderFactory;
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.connect.connector.ConnectRecord;
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.errors.ConnectException;
  import org.apache.kafka.connect.transforms.Transformation;
  import org.apache.kafka.connect.transforms.util.SimpleConfig;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  
  public class SinkPojoToSchemaAndStructTransform<R extends ConnectRecord<R>> implements Transformation<R> {
      public static final String CAMEL_TRANSFORMER_SINK_POJO_CLASS_PROPERTY = "camel.transformer.sink.pojo.class";
  
      private static final Logger LOG = LoggerFactory.getLogger(SinkPojoToSchemaAndStructTransform.class);
  
      private static final ObjectMapper MAPPER = new ObjectMapper(new AvroFactory());
      private static final String CAMEL_TRANSFORMER_SINK_POJO_CLASS_DOC = "Full qualified class name of the pojo you want your record value converted to";
      private static final Object CAMEL_TRANSFORMER_SINK_POJO_CLASS_DEFAULT = ConfigDef.NO_DEFAULT_VALUE;
      private static final ConfigDef CONFIG_DEF = (new ConfigDef()).define(CAMEL_TRANSFORMER_SINK_POJO_CLASS_PROPERTY, ConfigDef.Type.STRING, CAMEL_TRANSFORMER_SINK_POJO_CLASS_DEFAULT, ConfigDef.Importance.HIGH, CAMEL_TRANSFORMER_SINK_POJO_CLASS_DOC);
  
      private String pojoClass;
      private ObjectReader objectReader;
      private AvroData avroData;
  
  
      @Override
      public R apply(R r) {
          LOG.debug("Incoming record: {}", r);
  
          if (r.value() != null && r.valueSchema() != null && Schema.Type.STRUCT.equals(r.valueSchema().type())) {
              GenericRecord avroGenericRecord = (GenericRecord)avroData.fromConnectData(r.valueSchema(), r.value());
  
              if (avroGenericRecord == null) {
                  LOG.warn("No GenericRecord was converted as part of this transformation");
  
                  return r;
              }
  
              LOG.debug("GenericRecord created: {} \nwith schema: {}", avroGenericRecord, avroGenericRecord.getClass().getName());
  
              GenericDatumWriter<GenericRecord> writer = new GenericDatumWriter<>(avroGenericRecord.getSchema());
  
              Object pojo;
              try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
                  Encoder encoder = EncoderFactory.get().binaryEncoder(out, null);
                  writer.write(avroGenericRecord, encoder);
                  encoder.flush();
  
                  byte[] avroDataBytes = out.toByteArray();
                  pojo = objectReader
                          .with(new AvroSchema(avroGenericRecord.getSchema()))
                          .readValue(avroDataBytes);
                  LOG.debug("Pojo of class {} created: {}", pojo.getClass(), pojo);
              } catch (IOException e) {
                  throw new ConnectException("Error in generating POJO from Struct.", e);
              }
  
              LOG.debug("Generate pojo: {}", pojo);
              return r.newRecord(r.topic(), r.kafkaPartition(), r.keySchema(), r.key(),
                      null, pojo, r.timestamp());
          } else {
              LOG.debug("Incoming record with a null value or a value schema != Schema.Type.STRUCT, nothing to be done.");
              return r;
          }
      }
  
      @Override
      public ConfigDef config() {
          return CONFIG_DEF;
      }
  
      @Override
      public void close() {
          //NOOP
      }
  
      @Override
      public void configure(Map<String, ?> configs) {
          SimpleConfig config = new SimpleConfig(CONFIG_DEF, configs);
          this.pojoClass = config.getString(CAMEL_TRANSFORMER_SINK_POJO_CLASS_PROPERTY);
  
          this.avroData = new AvroData(new AvroDataConfig(configs));
  
          try {
              this.objectReader = MAPPER.readerFor(Class.forName(pojoClass));
          } catch (ClassNotFoundException e) {
              throw new ConnectException("Unable to initialize SinkPojoToSchemaAndStructTransform ", e);
          }
      }
  }