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.text.SimpleDateFormat;
  import java.time.Instant;
  import java.util.Date;
  import java.util.TimeZone;
  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 TimestampRouter {
  
      public void process(
              @ExchangeProperty("topicFormat") String topicFormat, @ExchangeProperty("timestampFormat") String timestampFormat,
              @ExchangeProperty("timestampHeaderName") String timestampHeaderName, Exchange ex) {
          final Pattern TOPIC = Pattern.compile("$[topic]", Pattern.LITERAL);
  
          final Pattern TIMESTAMP = Pattern.compile("$[timestamp]", Pattern.LITERAL);
  
          final SimpleDateFormat fmt = new SimpleDateFormat(timestampFormat);
          fmt.setTimeZone(TimeZone.getTimeZone("UTC"));
  
          Long timestamp = null;
          String topicName = ex.getMessage().getHeader("kafka.TOPIC", String.class);
          Object rawTimestamp = ex.getMessage().getHeader(timestampHeaderName);
          if (rawTimestamp instanceof Long) {
              timestamp = (Long) rawTimestamp;
          } else if (rawTimestamp instanceof Instant) {
              timestamp = ((Instant) rawTimestamp).toEpochMilli();
          } else if (ObjectHelper.isNotEmpty(rawTimestamp)) {
              timestamp = Long.parseLong(rawTimestamp.toString());
          }
          if (ObjectHelper.isNotEmpty(timestamp)) {
              final String formattedTimestamp = fmt.format(new Date(timestamp));
              String replace1;
              String updatedTopic;
  
              if (ObjectHelper.isNotEmpty(topicName)) {
                  replace1 = TOPIC.matcher(topicFormat).replaceAll(Matcher.quoteReplacement(topicName));
                  updatedTopic = TIMESTAMP.matcher(replace1).replaceAll(Matcher.quoteReplacement(formattedTimestamp));
              } else {
                  replace1 = TOPIC.matcher(topicFormat).replaceAll(Matcher.quoteReplacement(""));
                  updatedTopic = TIMESTAMP.matcher(replace1).replaceAll(Matcher.quoteReplacement(formattedTimestamp));
              }
              ex.getMessage().setHeader("kafka.OVERRIDE_TOPIC", updatedTopic);
          }
      }
  
  }
  