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.component.kafka.transform;
  
  import java.util.Map;
  
  import com.fasterxml.jackson.core.type.TypeReference;
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import org.apache.camel.Exchange;
  import org.apache.camel.InvalidPayloadException;
  import org.apache.camel.Processor;
  
  public class ExtractField implements Processor {
  
      String field;
      String headerOutputName;
      boolean headerOutput;
      boolean strictHeaderCheck;
      boolean trimField;
  
      static final String EXTRACTED_FIELD_HEADER = "CamelKameletsExtractFieldName";
  
      /**
       * Default constructor
       */
      public ExtractField() {
      }
  
      /**
       * Constructor using field member.
       *
       * @param field the field name to extract.
       */
      public ExtractField(String field) {
          this.field = field;
      }
  
      @Override
      public void process(Exchange ex) throws InvalidPayloadException {
          ObjectMapper mapper = new ObjectMapper();
          JsonNode jsonNodeBody = ex.getMessage().getBody(JsonNode.class);
  
          if (jsonNodeBody == null) {
              throw new InvalidPayloadException(ex, JsonNode.class);
  
          }
  
          Map<Object, Object> body = mapper.convertValue(jsonNodeBody, new TypeReference<Map<Object, Object>>() {
          });
          if (!headerOutput || (strictHeaderCheck && checkHeaderExistence(ex))) {
              ex.getMessage().setBody(body.get(field));
          } else {
              extractToHeader(ex, body);
          }
          if (trimField) {
              ex.setProperty("trimField", "true");
          } else {
              ex.setProperty("trimField", "false");
          }
      }
  
      private void extractToHeader(Exchange ex, Map<Object, Object> body) {
          if (headerOutputName == null || headerOutputName.isEmpty() || "none".equalsIgnoreCase(headerOutputName)) {
              ex.getMessage().setHeader(EXTRACTED_FIELD_HEADER, body.get(field));
          } else {
              ex.getMessage().setHeader(headerOutputName, body.get(field));
          }
      }
  
      private boolean checkHeaderExistence(Exchange exchange) {
          if (headerOutputName == null || headerOutputName.isEmpty() || "none".equalsIgnoreCase(headerOutputName)) {
              return exchange.getMessage().getHeaders().containsKey(EXTRACTED_FIELD_HEADER);
          } else {
              return exchange.getMessage().getHeaders().containsKey(headerOutputName);
          }
      }
  
      public void setField(String field) {
          this.field = field;
      }
  
      public void setHeaderOutput(boolean headerOutput) {
          this.headerOutput = headerOutput;
      }
  
      public void setHeaderOutputName(String headerOutputName) {
          this.headerOutputName = headerOutputName;
      }
  
      public void setStrictHeaderCheck(boolean strictHeaderCheck) {
          this.strictHeaderCheck = strictHeaderCheck;
      }
  
      public void setTrimField(boolean trimField) {
          this.trimField = trimField;
      }
  }
  