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.*;
  import java.util.stream.Collectors;
  
  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.ExchangeProperty;
  import org.apache.camel.InvalidPayloadException;
  import org.apache.camel.util.ObjectHelper;
  
  public class ReplaceField {
  
      public JsonNode process(
              @ExchangeProperty("enabled") String enabled, @ExchangeProperty("disabled") String disabled,
              @ExchangeProperty("renames") String renames, Exchange ex)
              throws InvalidPayloadException {
          ObjectMapper mapper = new ObjectMapper();
          List<String> enabledFields = new ArrayList<>();
          List<String> disabledFields = new ArrayList<>();
          List<String> renameFields = new ArrayList<>();
          JsonNode jsonNodeBody = ex.getMessage().getBody(JsonNode.class);
          Map<Object, Object> body = mapper.convertValue(jsonNodeBody, new TypeReference<Map<Object, Object>>() {
          });
          if (ObjectHelper.isNotEmpty(enabled) && !enabled.equalsIgnoreCase("all")) {
              enabledFields = Arrays.stream(enabled.split(",")).collect(Collectors.toList());
          }
          if (ObjectHelper.isNotEmpty(disabled) && !disabled.equalsIgnoreCase("none")) {
              disabledFields = Arrays.stream(disabled.split(",")).collect(Collectors.toList());
          }
          if (ObjectHelper.isNotEmpty(disabled)) {
              renameFields = Arrays.stream(renames.split(",")).collect(Collectors.toList());
          }
          Map<Object, Object> updatedBody = new HashMap<>();
  
          if (ObjectHelper.isNotEmpty(renameFields)) {
              Map<String, String> renamingMap = parseNames(renameFields);
  
              for (Map.Entry<Object, Object> entry : body.entrySet()) {
                  final String fieldName = (String) entry.getKey();
                  if (filterNames(fieldName, enabledFields, disabledFields)) {
                      final Object fieldValue = entry.getValue();
                      updatedBody.put(renameOptional(fieldName, renamingMap), fieldValue);
                  }
              }
          }
          if (!updatedBody.isEmpty()) {
              return mapper.valueToTree(updatedBody);
          } else {
              return mapper.valueToTree(body);
          }
      }
  
      boolean filterNames(String fieldName, List<String> enabledFields, List<String> disabledFields) {
          return !disabledFields.contains(fieldName) && (enabledFields.isEmpty() || enabledFields.contains(fieldName));
      }
  
      static Map<String, String> parseNames(List<String> mappings) {
          final Map<String, String> m = new HashMap<>();
          for (String mapping : mappings) {
              final String[] parts = mapping.split(":");
              m.put(parts[0], parts[1]);
          }
          return m;
      }
  
      String renameOptional(String fieldName, Map<String, String> renames) {
          final String mapping = renames.get(fieldName);
          return mapping == null ? fieldName : mapping;
      }
  
  }
  