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.coap;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.support.DefaultProducer;
  import org.eclipse.californium.core.CoapClient;
  import org.eclipse.californium.core.CoapResponse;
  import org.eclipse.californium.core.coap.MediaTypeRegistry;
  
  /**
   * The CoAP producer.
   */
  public class CoAPProducer extends DefaultProducer {
      private final CoAPEndpoint endpoint;
      private volatile CoapClient client;
  
      public CoAPProducer(CoAPEndpoint endpoint) {
          super(endpoint);
          this.endpoint = endpoint;
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          initClient();
  
          String ct = exchange.getIn().getHeader(CoAPConstants.CONTENT_TYPE, String.class);
          if (ct == null) {
              // ?default?
              ct = "application/octet-stream";
          }
          String method = CoAPHelper.getDefaultMethod(exchange, client);
          int mediaType = MediaTypeRegistry.parse(ct);
          CoapResponse response = null;
          boolean pingResponse = false;
          switch (method) {
              case CoAPConstants.METHOD_GET:
                  response = client.get();
                  break;
              case CoAPConstants.METHOD_DELETE:
                  response = client.delete();
                  break;
              case CoAPConstants.METHOD_POST:
                  byte[] bodyPost = exchange.getIn().getBody(byte[].class);
                  response = client.post(bodyPost, mediaType);
                  break;
              case CoAPConstants.METHOD_PUT:
                  byte[] bodyPut = exchange.getIn().getBody(byte[].class);
                  response = client.put(bodyPut, mediaType);
                  break;
              case CoAPConstants.METHOD_PING:
                  pingResponse = client.ping();
                  break;
              default:
                  break;
          }
  
          if (response != null) {
              CoAPHelper.convertCoapResponseToMessage(response, exchange.getOut());
          }
  
          if (method.equalsIgnoreCase(CoAPConstants.METHOD_PING)) {
              Message resp = exchange.getOut();
              resp.setBody(pingResponse);
          }
      }
  
      protected void initClient() throws Exception {
          lock.lock();
          try {
              if (client == null) {
                  client = endpoint.createCoapClient(endpoint.getUri());
              }
          } finally {
              lock.unlock();
          }
      }
  
      @Override
      protected void doStop() throws Exception {
          if (client != null) {
              client.shutdown();
              client = null;
          }
      }
  }
  