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.jsonpatch;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.github.fge.jsonpatch.JsonPatch;
  import org.apache.camel.Exchange;
  import org.apache.camel.support.DefaultProducer;
  import org.apache.camel.support.ExchangeHelper;
  import org.apache.camel.support.ResourceHelper;
  
  public class JsonPatchProducer extends DefaultProducer {
      private final JsonPatchEndpoint endpoint;
      private final ObjectMapper objectMapper;
  
      public JsonPatchProducer(JsonPatchEndpoint endpoint) {
          this(endpoint, new ObjectMapper());
      }
  
      public JsonPatchProducer(JsonPatchEndpoint endpoint, ObjectMapper objectMapper) {
          super(endpoint);
          this.endpoint = endpoint;
          this.objectMapper = objectMapper;
      }
  
      public void process(Exchange exchange) throws Exception {
          String resourceUri = null;
          if (endpoint.isAllowTemplateFromHeader()) {
              resourceUri = exchange.getIn().getHeader(JsonPatchConstants.JSON_PATCH_RESOURCE_URI, String.class);
          }
          if (resourceUri == null || resourceUri.isEmpty()) {
              resourceUri = endpoint.getResourceUri();
          }
  
          final JsonPatch patch = objectMapper.readValue(
                  ResourceHelper.resolveMandatoryResourceAsInputStream(exchange.getContext(), resourceUri),
                  JsonPatch.class);
          JsonNode input = objectMapper.readTree(exchange.getIn().getBody(String.class));
          JsonNode result = patch.apply(input);
  
          ExchangeHelper.setInOutBodyPatternAware(exchange, result.toString());
      }
  
  }
  