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 java.util.LinkedList;
  import java.util.List;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.util.ObjectHelper;
  import org.eclipse.californium.core.CoapClient;
  import org.eclipse.californium.core.CoapResponse;
  import org.eclipse.californium.core.coap.MediaTypeRegistry;
  
  /**
   * Various helper methods for CoAP
   */
  public final class CoAPHelper {
  
      private CoAPHelper() {
      }
  
      /**
       * Determines which CoAP request method to use based on the content of the target request URI, the message body or
       * value from the CamelCoapMethod header.
       *
       * @param  exchange the exchange
       * @param  client   the CoAP client
       * @return          the CoAP request method
       */
      public static String getDefaultMethod(Exchange exchange, CoapClient client) {
          String method = exchange.getIn().getHeader(CoAPConstants.COAP_METHOD, String.class);
          if (method == null) {
              Object body = exchange.getIn().getBody();
              if (body == null || client.getURI().contains("?")) {
                  method = CoAPConstants.METHOD_GET;
              } else {
                  method = CoAPConstants.METHOD_POST;
              }
          }
          return method;
      }
  
      /**
       * Determines which method verbs the CoAP server should be restricted to handling.
       */
      public static String getDefaultMethodRestrict(String methodRestrict) {
          if (ObjectHelper.isNotEmpty(methodRestrict)) {
              return methodRestrict;
          }
          return CoAPConstants.METHOD_RESTRICT_ALL;
      }
  
      public static List<String> getPathSegmentsFromPath(String path) {
          List<String> segments = new LinkedList<>();
          if (path.startsWith("/")) {
              path = path.substring(1);
          }
          while (!path.isEmpty()) {
              int idx = path.indexOf('/');
              if (idx == -1) {
                  segments.add(path);
                  break;
              }
              segments.add(path.substring(0, idx));
              path = path.substring(idx + 1);
          }
          return segments;
      }
  
      public static void convertCoapResponseToMessage(CoapResponse coapResponse, Message message) {
          String mt = MediaTypeRegistry.toString(coapResponse.getOptions().getContentFormat());
          message.setHeader(CoAPConstants.CONTENT_TYPE, mt);
          message.setHeader(CoAPConstants.COAP_RESPONSE_CODE, coapResponse.getCode().toString());
          message.setBody(coapResponse.getPayload());
      }
  }
  