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.json;
  
  import org.apache.kafka.common.errors.SerializationException;
  import org.apache.kafka.common.serialization.Deserializer;
  
  import com.fasterxml.jackson.core.json.JsonReadFeature;
  import com.fasterxml.jackson.databind.DeserializationFeature;
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.fasterxml.jackson.databind.node.JsonNodeFactory;
  import com.fasterxml.jackson.module.blackbird.BlackbirdModule;
  
  import java.util.Collections;
  import java.util.Set;
  
  /**
   * JSON deserializer for Jackson's {@link JsonNode} tree model. Using the tree model allows it to work with arbitrarily
   * structured data without having associated Java classes. This deserializer also supports Connect schemas.
   */
  public class JsonDeserializer implements Deserializer<JsonNode> {
      private final ObjectMapper objectMapper = new ObjectMapper();
  
      /**
       * Default constructor needed by Kafka
       */
      public JsonDeserializer() {
          this(Collections.emptySet(), new JsonNodeFactory(true), true);
      }
  
      /**
       * A constructor that additionally specifies some {@link DeserializationFeature}s
       * for the deserializer
       *
       * @param deserializationFeatures the specified deserialization features
       * @param jsonNodeFactory the json node factory to use.
       */
      JsonDeserializer(
          final Set<DeserializationFeature> deserializationFeatures,
          final JsonNodeFactory jsonNodeFactory,
          final boolean enableBlackbird
      ) {
          objectMapper.enable(JsonReadFeature.ALLOW_LEADING_ZEROS_FOR_NUMBERS.mappedFeature());
          deserializationFeatures.forEach(objectMapper::enable);
          objectMapper.setNodeFactory(jsonNodeFactory);
          if (enableBlackbird) {
              objectMapper.registerModule(new BlackbirdModule());
          }
      }
  
      @Override
      public JsonNode deserialize(String topic, byte[] bytes) {
          if (bytes == null)
              return null;
  
          JsonNode data;
          try {
              data = objectMapper.readTree(bytes);
          } catch (Exception e) {
              throw new SerializationException(e);
          }
  
          return data;
      }
  }
  