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.net.URI;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.support.DefaultProducer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The CoAP notifier.
   */
  public class CoAPNotifier extends DefaultProducer {
  
      private static final Logger LOG = LoggerFactory.getLogger(CoAPNotifier.class);
  
      private final CoAPEndpoint endpoint;
  
      public CoAPNotifier(CoAPEndpoint endpoint) {
          super(endpoint);
          this.endpoint = endpoint;
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          URI uri = endpoint.getUri();
          CamelCoapResource resource = endpoint.getCamelCoapResource(uri.getPath());
          if (resource == null) {
              throw new IllegalStateException("Resource not found: " + endpoint.getUri());
          }
          if (!resource.isObservable()) {
              LOG.warn("Ignoring notification attempt for resource that is not observable: {}", endpoint.getUri());
              return;
          }
  
          resource.changed(observeRelation -> {
              // this implementation only supports notifying URIs with all {placeholders}
              // replaced or with all {placeholders} intact.
              if (uri.getPath().equals(resource.getPath() + resource.getName())) {
                  // resource path == notified path, including any {placeholder} path segments.
                  return true;
              } else {
                  // resource path != notified path. This is true when the resource path contains
                  // {placeholders} while the notified path does not.
                  // Only notify a client if the requested path == notified uri.
                  String observedPath = observeRelation.getExchange().getRequest().getOptions().getUriPathString();
                  return uri.getPath().equals(observedPath);
              }
          });
      }
  
  }
  