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.knative.ce;
  
  import java.util.Locale;
  import java.util.Map;
  import java.util.Objects;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.Processor;
  import org.apache.camel.cloudevents.CloudEvent;
  import org.apache.camel.cloudevents.CloudEvents;
  import org.apache.camel.component.knative.KnativeEndpoint;
  import org.apache.camel.component.knative.spi.KnativeResource;
  
  import static org.apache.camel.util.ObjectHelper.ifNotEmpty;
  
  public enum CloudEventProcessors implements CloudEventProcessor {
  
      v1_0(new AbstractCloudEventProcessor(CloudEvents.v1_0) {
          @Override
          protected void decodeStructuredContent(Exchange exchange, Map<String, Object> content) {
              final CloudEvent ce = cloudEvent();
              final Message message = exchange.getIn();
  
              // body
              ifNotEmpty(content.remove("data"), message::setBody);
  
              ifNotEmpty(content.remove(ce.mandatoryAttribute(CloudEvent.CAMEL_CLOUD_EVENT_DATA_CONTENT_TYPE).json()), val -> {
                  message.setHeader(Exchange.CONTENT_TYPE, val);
              });
  
              for (CloudEvent.Attribute attribute : ce.attributes()) {
                  ifNotEmpty(content.remove(attribute.json()), val -> {
                      message.setHeader(attribute.id(), val);
                  });
              }
  
              //
              // Map every remaining field as it is (extensions).
              //
              content.forEach((key, val) -> {
                  message.setHeader(key.toLowerCase(Locale.US), val);
              });
          }
      }),
      v1_0_1(new AbstractCloudEventProcessor(CloudEvents.v1_0_1) {
          @Override
          protected void decodeStructuredContent(Exchange exchange, Map<String, Object> content) {
              final CloudEvent ce = cloudEvent();
              final Message message = exchange.getIn();
  
              // body
              ifNotEmpty(content.remove("data"), message::setBody);
  
              ifNotEmpty(content.remove(ce.mandatoryAttribute(CloudEvent.CAMEL_CLOUD_EVENT_DATA_CONTENT_TYPE).json()), val -> {
                  message.setHeader(Exchange.CONTENT_TYPE, val);
              });
  
              for (CloudEvent.Attribute attribute : ce.attributes()) {
                  ifNotEmpty(content.remove(attribute.json()), val -> {
                      message.setHeader(attribute.id(), val);
                  });
              }
  
              //
              // Map every remaining field as it is (extensions).
              //
              content.forEach((key, val) -> {
                  message.setHeader(key.toLowerCase(Locale.US), val);
              });
          }
      }),
      v1_0_2(new AbstractCloudEventProcessor(CloudEvents.v1_0_2) {
          @Override
          protected void decodeStructuredContent(Exchange exchange, Map<String, Object> content) {
              final CloudEvent ce = cloudEvent();
              final Message message = exchange.getIn();
  
              // body
              ifNotEmpty(content.remove("data"), message::setBody);
  
              ifNotEmpty(content.remove(ce.mandatoryAttribute(CloudEvent.CAMEL_CLOUD_EVENT_DATA_CONTENT_TYPE).json()), val -> {
                  message.setHeader(Exchange.CONTENT_TYPE, val);
              });
  
              for (CloudEvent.Attribute attribute : ce.attributes()) {
                  ifNotEmpty(content.remove(attribute.json()), val -> {
                      message.setHeader(attribute.id(), val);
                  });
              }
  
              //
              // Map every remaining field as it is (extensions).
              //
              content.forEach((key, val) -> {
                  message.setHeader(key.toLowerCase(Locale.US), val);
              });
          }
      });
  
      private final CloudEventProcessor instance;
  
      CloudEventProcessors(CloudEventProcessor instance) {
          this.instance = instance;
      }
  
      @Override
      public CloudEvent cloudEvent() {
          return instance.cloudEvent();
      }
  
      @Override
      public Processor consumer(KnativeEndpoint endpoint, KnativeResource service) {
          return instance.consumer(endpoint, service);
      }
  
      @Override
      public Processor producer(KnativeEndpoint endpoint, KnativeResource service) {
          return instance.producer(endpoint, service);
      }
  
      public static CloudEventProcessor fromSpecVersion(String version) {
          for (CloudEventProcessor processor : CloudEventProcessors.values()) {
              if (Objects.equals(processor.cloudEvent().version(), version)) {
                  return processor;
              }
          }
  
          throw new IllegalArgumentException("Unable to find an implementation for CloudEvents spec: " + version);
      }
  }
  