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.kafka.transform;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.ExchangeProperty;
  import org.apache.camel.util.ObjectHelper;
  
  public class RegexRouter {
  
      public void process(
              @ExchangeProperty("regex") String regex, @ExchangeProperty("replacement") String replacement, Exchange ex) {
          Pattern regexPattern = Pattern.compile(regex);
          String topicName = ex.getMessage().getHeader("kafka.TOPIC", String.class);
          if (ObjectHelper.isNotEmpty(topicName)) {
              final Matcher matcher = regexPattern.matcher(topicName);
              if (matcher.matches()) {
                  final String topicUpdated = matcher.replaceFirst(replacement);
                  ex.getMessage().setHeader("kafka.OVERRIDE_TOPIC", topicUpdated);
              }
          }
          String ceType = ex.getMessage().getHeader("ce-type", String.class);
          if (ObjectHelper.isNotEmpty(ceType)) {
              final Matcher matcher = regexPattern.matcher(ceType);
              if (matcher.matches()) {
                  final String ceTypeUpdated = matcher.replaceFirst(replacement);
                  ex.getMessage().setHeader("ce-type", ceTypeUpdated);
              }
          }
      }
  
  }
  